diff --git a/ports/atmel-samd/boards/aloriumtech_evo_m51/pins.c b/ports/atmel-samd/boards/aloriumtech_evo_m51/pins.c
index 35cc41b557..d6a2979d9e 100644
--- a/ports/atmel-samd/boards/aloriumtech_evo_m51/pins.c
+++ b/ports/atmel-samd/boards/aloriumtech_evo_m51/pins.c
@@ -53,6 +53,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_BATTERY), MP_ROM_PTR(&pin_PB01) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 
diff --git a/ports/atmel-samd/boards/blm_badge/pins.c b/ports/atmel-samd/boards/blm_badge/pins.c
index 6da6f0e9db..993abae2b8 100644
--- a/ports/atmel-samd/boards/blm_badge/pins.c
+++ b/ports/atmel-samd/boards/blm_badge/pins.c
@@ -44,5 +44,6 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_D13), MP_ROM_PTR(&pin_PA03) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
 };
 MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/atmel-samd/boards/capablerobot_usbhub/pins.c b/ports/atmel-samd/boards/capablerobot_usbhub/pins.c
index 02bb347fe0..d82517890f 100644
--- a/ports/atmel-samd/boards/capablerobot_usbhub/pins.c
+++ b/ports/atmel-samd/boards/capablerobot_usbhub/pins.c
@@ -33,6 +33,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR_MISO),   MP_ROM_PTR(&pin_PB23) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C),        MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI),        MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART),       MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/atmel-samd/boards/cp_sapling_m0/pins.c b/ports/atmel-samd/boards/cp_sapling_m0/pins.c
index c830f86aa8..effb33ffe0 100644
--- a/ports/atmel-samd/boards/cp_sapling_m0/pins.c
+++ b/ports/atmel-samd/boards/cp_sapling_m0/pins.c
@@ -35,6 +35,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_NEOPIXEL), MP_ROM_PTR(&pin_PA15) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
 };
 MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/atmel-samd/boards/cp_sapling_m0_revb/pins.c b/ports/atmel-samd/boards/cp_sapling_m0_revb/pins.c
index 93eefbdf8f..8524648651 100644
--- a/ports/atmel-samd/boards/cp_sapling_m0_revb/pins.c
+++ b/ports/atmel-samd/boards/cp_sapling_m0_revb/pins.c
@@ -50,6 +50,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_NEOPIXEL), MP_ROM_PTR(&pin_PA15) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/atmel-samd/boards/cp_sapling_m0_spiflash/pins.c b/ports/atmel-samd/boards/cp_sapling_m0_spiflash/pins.c
index c830f86aa8..effb33ffe0 100644
--- a/ports/atmel-samd/boards/cp_sapling_m0_spiflash/pins.c
+++ b/ports/atmel-samd/boards/cp_sapling_m0_spiflash/pins.c
@@ -35,6 +35,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_NEOPIXEL), MP_ROM_PTR(&pin_PA15) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
 };
 MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/atmel-samd/boards/hallowing_m0_express/pins.c b/ports/atmel-samd/boards/hallowing_m0_express/pins.c
index 842832c392..576936a4aa 100644
--- a/ports/atmel-samd/boards/hallowing_m0_express/pins.c
+++ b/ports/atmel-samd/boards/hallowing_m0_express/pins.c
@@ -63,6 +63,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_ACCELEROMETER_INTERRUPT), MP_ROM_PTR(&pin_PA14) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 
diff --git a/ports/atmel-samd/boards/hallowing_m4_express/pins.c b/ports/atmel-samd/boards/hallowing_m4_express/pins.c
index 9c5a007be0..105206ba8e 100644
--- a/ports/atmel-samd/boards/hallowing_m4_express/pins.c
+++ b/ports/atmel-samd/boards/hallowing_m4_express/pins.c
@@ -67,6 +67,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_CAP_PIN), MP_ROM_PTR(&pin_PA15) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 
diff --git a/ports/atmel-samd/boards/matrixportal_m4/pins.c b/ports/atmel-samd/boards/matrixportal_m4/pins.c
index 09957ba682..205cd6f3c6 100644
--- a/ports/atmel-samd/boards/matrixportal_m4/pins.c
+++ b/ports/atmel-samd/boards/matrixportal_m4/pins.c
@@ -58,6 +58,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR_L),MP_ROM_PTR(&pin_PA14) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/atmel-samd/boards/monster_m4sk/pins.c b/ports/atmel-samd/boards/monster_m4sk/pins.c
index 8de94e2d70..9f5369c574 100644
--- a/ports/atmel-samd/boards/monster_m4sk/pins.c
+++ b/ports/atmel-samd/boards/monster_m4sk/pins.c
@@ -48,6 +48,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_LEFT_TFT_DC), MP_ROM_PTR(&pin_PB22) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
 
     { MP_ROM_QSTR(MP_QSTR_DISPLAY), MP_ROM_PTR(&displays[0].display)},
     { MP_ROM_QSTR(MP_QSTR_RIGHT_DISPLAY), MP_ROM_PTR(&displays[0].display)}
diff --git a/ports/atmel-samd/boards/pybadge/pins.c b/ports/atmel-samd/boards/pybadge/pins.c
index eb8aa81241..49a48447a6 100644
--- a/ports/atmel-samd/boards/pybadge/pins.c
+++ b/ports/atmel-samd/boards/pybadge/pins.c
@@ -66,6 +66,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_TFT_DC), MP_ROM_PTR(&pin_PB05) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 
diff --git a/ports/atmel-samd/boards/pygamer/pins.c b/ports/atmel-samd/boards/pygamer/pins.c
index f81b306a48..191f8a7c6b 100644
--- a/ports/atmel-samd/boards/pygamer/pins.c
+++ b/ports/atmel-samd/boards/pygamer/pins.c
@@ -71,6 +71,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR_JOYSTICK_Y),  MP_ROM_PTR(&pin_PB06) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 
diff --git a/ports/atmel-samd/boards/pyportal/pins.c b/ports/atmel-samd/boards/pyportal/pins.c
index d2c7589ee1..1fa05cc460 100644
--- a/ports/atmel-samd/boards/pyportal/pins.c
+++ b/ports/atmel-samd/boards/pyportal/pins.c
@@ -78,6 +78,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR_SD_CARD_DETECT),MP_ROM_PTR(&pin_PA01) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
 
     { MP_ROM_QSTR(MP_QSTR_DISPLAY), MP_ROM_PTR(&displays[0].display) },
diff --git a/ports/atmel-samd/boards/pyportal_titano/pins.c b/ports/atmel-samd/boards/pyportal_titano/pins.c
index d2c7589ee1..1fa05cc460 100644
--- a/ports/atmel-samd/boards/pyportal_titano/pins.c
+++ b/ports/atmel-samd/boards/pyportal_titano/pins.c
@@ -78,6 +78,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR_SD_CARD_DETECT),MP_ROM_PTR(&pin_PA01) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
 
     { MP_ROM_QSTR(MP_QSTR_DISPLAY), MP_ROM_PTR(&displays[0].display) },
diff --git a/ports/atmel-samd/boards/qtpy_m0/pins.c b/ports/atmel-samd/boards/qtpy_m0/pins.c
index 0796838437..477fead9ca 100644
--- a/ports/atmel-samd/boards/qtpy_m0/pins.c
+++ b/ports/atmel-samd/boards/qtpy_m0/pins.c
@@ -45,6 +45,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_NEOPIXEL_POWER), MP_ROM_PTR(&pin_PA15) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/atmel-samd/boards/qtpy_m0_haxpress/pins.c b/ports/atmel-samd/boards/qtpy_m0_haxpress/pins.c
index 0796838437..477fead9ca 100644
--- a/ports/atmel-samd/boards/qtpy_m0_haxpress/pins.c
+++ b/ports/atmel-samd/boards/qtpy_m0_haxpress/pins.c
@@ -45,6 +45,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_NEOPIXEL_POWER), MP_ROM_PTR(&pin_PA15) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/atmel-samd/boards/sparkfun_qwiic_micro_no_flash/pins.c b/ports/atmel-samd/boards/sparkfun_qwiic_micro_no_flash/pins.c
index dee32d5f1a..af365cdaa3 100644
--- a/ports/atmel-samd/boards/sparkfun_qwiic_micro_no_flash/pins.c
+++ b/ports/atmel-samd/boards/sparkfun_qwiic_micro_no_flash/pins.c
@@ -41,7 +41,8 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     // I2C and Qwiic Connector
     { MP_ROM_QSTR(MP_QSTR_SDA), MP_ROM_PTR(&pin_PA08) },
     { MP_ROM_QSTR(MP_QSTR_SCL), MP_ROM_PTR(&pin_PA09) },
-    { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) }
+    { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
 
 };
 MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/atmel-samd/boards/sparkfun_qwiic_micro_with_flash/pins.c b/ports/atmel-samd/boards/sparkfun_qwiic_micro_with_flash/pins.c
index dee32d5f1a..af365cdaa3 100644
--- a/ports/atmel-samd/boards/sparkfun_qwiic_micro_with_flash/pins.c
+++ b/ports/atmel-samd/boards/sparkfun_qwiic_micro_with_flash/pins.c
@@ -41,7 +41,8 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     // I2C and Qwiic Connector
     { MP_ROM_QSTR(MP_QSTR_SDA), MP_ROM_PTR(&pin_PA08) },
     { MP_ROM_QSTR(MP_QSTR_SCL), MP_ROM_PTR(&pin_PA09) },
-    { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) }
+    { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
 
 };
 MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/atmel-samd/boards/sparkfun_redboard_turbo/pins.c b/ports/atmel-samd/boards/sparkfun_redboard_turbo/pins.c
index de81d035d8..8b321e11cf 100755
--- a/ports/atmel-samd/boards/sparkfun_redboard_turbo/pins.c
+++ b/ports/atmel-samd/boards/sparkfun_redboard_turbo/pins.c
@@ -44,6 +44,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_MISO), MP_ROM_PTR(&pin_PA12) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/atmel-samd/boards/sparkfun_samd51_thing_plus/pins.c b/ports/atmel-samd/boards/sparkfun_samd51_thing_plus/pins.c
index be2b09848c..3e7a2b5548 100644
--- a/ports/atmel-samd/boards/sparkfun_samd51_thing_plus/pins.c
+++ b/ports/atmel-samd/boards/sparkfun_samd51_thing_plus/pins.c
@@ -33,6 +33,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_D13), MP_ROM_PTR(&pin_PA17) },
     { MP_ROM_QSTR(MP_QSTR_LED), MP_ROM_PTR(&pin_PA17) },
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/atmel-samd/boards/stackrduino_m0_pro/pins.c b/ports/atmel-samd/boards/stackrduino_m0_pro/pins.c
index b854982500..a8162309e0 100644
--- a/ports/atmel-samd/boards/stackrduino_m0_pro/pins.c
+++ b/ports/atmel-samd/boards/stackrduino_m0_pro/pins.c
@@ -43,6 +43,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_CHRG_EN), MP_ROM_PTR(&pin_PA13) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/atmel-samd/boards/trellis_m4_express/pins.c b/ports/atmel-samd/boards/trellis_m4_express/pins.c
index 9668d3b0dc..61ca942ce6 100644
--- a/ports/atmel-samd/boards/trellis_m4_express/pins.c
+++ b/ports/atmel-samd/boards/trellis_m4_express/pins.c
@@ -45,5 +45,6 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_DOTSTAR_CLOCK), MP_ROM_PTR(&pin_PB02) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
 };
 MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/espressif/boards/adafruit_feather_esp32s2/pins.c b/ports/espressif/boards/adafruit_feather_esp32s2/pins.c
index 5029d82231..c9f0e870ed 100644
--- a/ports/espressif/boards/adafruit_feather_esp32s2/pins.c
+++ b/ports/espressif/boards/adafruit_feather_esp32s2/pins.c
@@ -66,6 +66,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_D39), MP_ROM_PTR(&pin_GPIO39) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) }
 };
diff --git a/ports/espressif/boards/adafruit_feather_esp32s2_tft/pins.c b/ports/espressif/boards/adafruit_feather_esp32s2_tft/pins.c
index cdb2f79f8e..f3b1c30a0d 100644
--- a/ports/espressif/boards/adafruit_feather_esp32s2_tft/pins.c
+++ b/ports/espressif/boards/adafruit_feather_esp32s2_tft/pins.c
@@ -69,6 +69,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_BOOT0), MP_ROM_PTR(&pin_GPIO0) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 
diff --git a/ports/espressif/boards/adafruit_funhouse/pins.c b/ports/espressif/boards/adafruit_funhouse/pins.c
index 1904150f35..17c2ac4256 100644
--- a/ports/espressif/boards/adafruit_funhouse/pins.c
+++ b/ports/espressif/boards/adafruit_funhouse/pins.c
@@ -48,6 +48,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR_DEBUG_RX), MP_ROM_PTR(&pin_GPIO38) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_DISPLAY), MP_ROM_PTR(&displays[0].display)},
 };
 MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/espressif/boards/adafruit_magtag_2.9_grayscale/pins.c b/ports/espressif/boards/adafruit_magtag_2.9_grayscale/pins.c
index 79b1feb40c..2aa2b11b06 100644
--- a/ports/espressif/boards/adafruit_magtag_2.9_grayscale/pins.c
+++ b/ports/espressif/boards/adafruit_magtag_2.9_grayscale/pins.c
@@ -53,6 +53,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_D1), MP_ROM_PTR(&pin_GPIO1) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
 
     { MP_ROM_QSTR(MP_QSTR_DISPLAY), MP_ROM_PTR(&displays[0].epaper_display)},
 
diff --git a/ports/espressif/boards/adafruit_metro_esp32s2/pins.c b/ports/espressif/boards/adafruit_metro_esp32s2/pins.c
index 4c393b4f85..0d2777b204 100644
--- a/ports/espressif/boards/adafruit_metro_esp32s2/pins.c
+++ b/ports/espressif/boards/adafruit_metro_esp32s2/pins.c
@@ -64,6 +64,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR_DEBUG_TX), MP_ROM_PTR(&pin_GPIO37) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/espressif/boards/microdev_micro_c3/pins.c b/ports/espressif/boards/microdev_micro_c3/pins.c
index 84d6efb782..240966404f 100644
--- a/ports/espressif/boards/microdev_micro_c3/pins.c
+++ b/ports/espressif/boards/microdev_micro_c3/pins.c
@@ -72,6 +72,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_NEOPIXEL), MP_ROM_PTR(&pin_GPIO7) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/espressif/boards/microdev_micro_s2/pins.c b/ports/espressif/boards/microdev_micro_s2/pins.c
index faf4a9e473..a382bf8fef 100644
--- a/ports/espressif/boards/microdev_micro_s2/pins.c
+++ b/ports/espressif/boards/microdev_micro_s2/pins.c
@@ -90,6 +90,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_NEOPIXEL), MP_ROM_PTR(&pin_GPIO33) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/espressif/boards/odt_pixelwing_esp32_s2/pins.c b/ports/espressif/boards/odt_pixelwing_esp32_s2/pins.c
index f547c28def..4daec42ae4 100644
--- a/ports/espressif/boards/odt_pixelwing_esp32_s2/pins.c
+++ b/ports/espressif/boards/odt_pixelwing_esp32_s2/pins.c
@@ -12,5 +12,6 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR_NEOPIXEL), MP_ROM_PTR(&pin_GPIO45) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
 };
 MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/espressif/boards/unexpectedmaker_feathers2/pins.c b/ports/espressif/boards/unexpectedmaker_feathers2/pins.c
index 66657b2f4f..f731b08688 100644
--- a/ports/espressif/boards/unexpectedmaker_feathers2/pins.c
+++ b/ports/espressif/boards/unexpectedmaker_feathers2/pins.c
@@ -98,6 +98,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_AMB), MP_ROM_PTR(&pin_GPIO4) }, // Ambient Light Sensor
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/espressif/boards/unexpectedmaker_feathers2_neo/pins.c b/ports/espressif/boards/unexpectedmaker_feathers2_neo/pins.c
index 61bf1397a9..43df5d506a 100644
--- a/ports/espressif/boards/unexpectedmaker_feathers2_neo/pins.c
+++ b/ports/espressif/boards/unexpectedmaker_feathers2_neo/pins.c
@@ -115,6 +115,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_IO21), MP_ROM_PTR(&pin_GPIO21) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/espressif/boards/unexpectedmaker_feathers2_prerelease/pins.c b/ports/espressif/boards/unexpectedmaker_feathers2_prerelease/pins.c
index 29ceffcdd5..34485b3ea8 100644
--- a/ports/espressif/boards/unexpectedmaker_feathers2_prerelease/pins.c
+++ b/ports/espressif/boards/unexpectedmaker_feathers2_prerelease/pins.c
@@ -96,6 +96,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_AMB), MP_ROM_PTR(&pin_GPIO4) }, // Ambient Light Sensor
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/espressif/boards/unexpectedmaker_feathers3/pins.c b/ports/espressif/boards/unexpectedmaker_feathers3/pins.c
index 8f7ac81261..988610edf2 100644
--- a/ports/espressif/boards/unexpectedmaker_feathers3/pins.c
+++ b/ports/espressif/boards/unexpectedmaker_feathers3/pins.c
@@ -113,6 +113,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_I39), MP_ROM_PTR(&pin_GPIO39) }, // Second LDO Enable control
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/espressif/boards/unexpectedmaker_pros3/pins.c b/ports/espressif/boards/unexpectedmaker_pros3/pins.c
index 0bf4bca35d..b9b03e853a 100644
--- a/ports/espressif/boards/unexpectedmaker_pros3/pins.c
+++ b/ports/espressif/boards/unexpectedmaker_pros3/pins.c
@@ -133,6 +133,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_I17), MP_ROM_PTR(&pin_GPIO17) }, // Second LDO Enable control
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/mimxrt10xx/boards/feather_m7_1011/pins.c b/ports/mimxrt10xx/boards/feather_m7_1011/pins.c
index 4bd7f13668..93c9d6430d 100644
--- a/ports/mimxrt10xx/boards/feather_m7_1011/pins.c
+++ b/ports/mimxrt10xx/boards/feather_m7_1011/pins.c
@@ -42,6 +42,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR_NEOPIXEL), MP_ROM_PTR(&pin_GPIO_00) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/mimxrt10xx/boards/metro_m7_1011/pins.c b/ports/mimxrt10xx/boards/metro_m7_1011/pins.c
index 0198ed90cc..886909e1dd 100644
--- a/ports/mimxrt10xx/boards/metro_m7_1011/pins.c
+++ b/ports/mimxrt10xx/boards/metro_m7_1011/pins.c
@@ -53,6 +53,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR_NEOPIXEL), MP_ROM_PTR(&pin_GPIO_00) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/nrf/boards/adafruit_led_glasses_nrf52840/pins.c b/ports/nrf/boards/adafruit_led_glasses_nrf52840/pins.c
index 8bc4ead19b..a53b1359c1 100644
--- a/ports/nrf/boards/adafruit_led_glasses_nrf52840/pins.c
+++ b/ports/nrf/boards/adafruit_led_glasses_nrf52840/pins.c
@@ -21,6 +21,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_SDA), MP_ROM_PTR(&pin_P0_06) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
 };
 
 MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/nrf/boards/clue_nrf52840_express/pins.c b/ports/nrf/boards/clue_nrf52840_express/pins.c
index 648477da4a..344e344f5b 100644
--- a/ports/nrf/boards/clue_nrf52840_express/pins.c
+++ b/ports/nrf/boards/clue_nrf52840_express/pins.c
@@ -107,6 +107,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_TFT_MOSI), MP_ROM_PTR(&pin_P0_15) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 
diff --git a/ports/nrf/boards/hiibot_bluefi/pins.c b/ports/nrf/boards/hiibot_bluefi/pins.c
index 2a18996c72..ba1910dc9d 100644
--- a/ports/nrf/boards/hiibot_bluefi/pins.c
+++ b/ports/nrf/boards/hiibot_bluefi/pins.c
@@ -174,6 +174,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_AUDIO), MP_ROM_PTR(&pin_P1_15) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 
diff --git a/ports/nrf/boards/sparkfun_nrf52840_mini/pins.c b/ports/nrf/boards/sparkfun_nrf52840_mini/pins.c
index a1e2e27cc1..e3188f9bdb 100644
--- a/ports/nrf/boards/sparkfun_nrf52840_mini/pins.c
+++ b/ports/nrf/boards/sparkfun_nrf52840_mini/pins.c
@@ -50,6 +50,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_QWIIC), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
 };
 
 MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/raspberrypi/boards/adafruit_feather_rp2040/pins.c b/ports/raspberrypi/boards/adafruit_feather_rp2040/pins.c
index 6afba676b4..a6bcaea125 100644
--- a/ports/raspberrypi/boards/adafruit_feather_rp2040/pins.c
+++ b/ports/raspberrypi/boards/adafruit_feather_rp2040/pins.c
@@ -32,6 +32,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_NEOPIXEL), MP_ROM_PTR(&pin_GPIO16) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/raspberrypi/boards/adafruit_kb2040/pins.c b/ports/raspberrypi/boards/adafruit_kb2040/pins.c
index 34e13fb6c7..fcf305d67b 100644
--- a/ports/raspberrypi/boards/adafruit_kb2040/pins.c
+++ b/ports/raspberrypi/boards/adafruit_kb2040/pins.c
@@ -40,6 +40,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_NEOPIXEL), MP_ROM_PTR(&pin_GPIO17) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/raspberrypi/boards/adafruit_macropad_rp2040/pins.c b/ports/raspberrypi/boards/adafruit_macropad_rp2040/pins.c
index 470d4d5371..1abb8469f0 100644
--- a/ports/raspberrypi/boards/adafruit_macropad_rp2040/pins.c
+++ b/ports/raspberrypi/boards/adafruit_macropad_rp2040/pins.c
@@ -45,6 +45,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_MISO), MP_ROM_PTR(&pin_GPIO28) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
 
     { MP_ROM_QSTR(MP_QSTR_DISPLAY), MP_ROM_PTR(&displays[0].display)}
diff --git a/ports/raspberrypi/boards/adafruit_qt2040_trinkey/pins.c b/ports/raspberrypi/boards/adafruit_qt2040_trinkey/pins.c
index 98fd7cf56f..1bdf2b35df 100644
--- a/ports/raspberrypi/boards/adafruit_qt2040_trinkey/pins.c
+++ b/ports/raspberrypi/boards/adafruit_qt2040_trinkey/pins.c
@@ -14,6 +14,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_BUTTON), MP_ROM_PTR(&pin_GPIO12) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
 MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/raspberrypi/boards/jpconstantineau_pykey18/pins.c b/ports/raspberrypi/boards/jpconstantineau_pykey18/pins.c
index 3cd5d5843e..dfa1ae9545 100644
--- a/ports/raspberrypi/boards/jpconstantineau_pykey18/pins.c
+++ b/ports/raspberrypi/boards/jpconstantineau_pykey18/pins.c
@@ -19,5 +19,6 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_SDA), MP_ROM_PTR(&pin_GPIO22) },
     { MP_ROM_QSTR(MP_QSTR_SCL), MP_ROM_PTR(&pin_GPIO23) },
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
 };
 MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/raspberrypi/boards/jpconstantineau_pykey87/pins.c b/ports/raspberrypi/boards/jpconstantineau_pykey87/pins.c
index cd5612f45b..63a7826f1d 100644
--- a/ports/raspberrypi/boards/jpconstantineau_pykey87/pins.c
+++ b/ports/raspberrypi/boards/jpconstantineau_pykey87/pins.c
@@ -32,5 +32,6 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_SDA), MP_ROM_PTR(&pin_GPIO22) },
     { MP_ROM_QSTR(MP_QSTR_SCL), MP_ROM_PTR(&pin_GPIO23) },
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
 };
 MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/raspberrypi/boards/melopero_shake_rp2040/pins.c b/ports/raspberrypi/boards/melopero_shake_rp2040/pins.c
index 76ab220216..c3bc3f6d6f 100644
--- a/ports/raspberrypi/boards/melopero_shake_rp2040/pins.c
+++ b/ports/raspberrypi/boards/melopero_shake_rp2040/pins.c
@@ -34,6 +34,7 @@ STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_NEOPIXEL), MP_ROM_PTR(&pin_GPIO16) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/raspberrypi/boards/pimoroni_interstate75/pins.c b/ports/raspberrypi/boards/pimoroni_interstate75/pins.c
index 1244f63a22..2460ebc76a 100644
--- a/ports/raspberrypi/boards/pimoroni_interstate75/pins.c
+++ b/ports/raspberrypi/boards/pimoroni_interstate75/pins.c
@@ -50,5 +50,6 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_CURRENT_SENSE), MP_ROM_PTR(&pin_GPIO29) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
 };
 MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/raspberrypi/boards/pimoroni_picolipo_16mb/pins.c b/ports/raspberrypi/boards/pimoroni_picolipo_16mb/pins.c
index 577b29736e..a89950cca7 100644
--- a/ports/raspberrypi/boards/pimoroni_picolipo_16mb/pins.c
+++ b/ports/raspberrypi/boards/pimoroni_picolipo_16mb/pins.c
@@ -50,5 +50,6 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_BAT_SENSE), MP_ROM_PTR(&pin_GPIO29) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
 };
 MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/raspberrypi/boards/pimoroni_picolipo_4mb/pins.c b/ports/raspberrypi/boards/pimoroni_picolipo_4mb/pins.c
index 577b29736e..a89950cca7 100644
--- a/ports/raspberrypi/boards/pimoroni_picolipo_4mb/pins.c
+++ b/ports/raspberrypi/boards/pimoroni_picolipo_4mb/pins.c
@@ -50,5 +50,6 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_BAT_SENSE), MP_ROM_PTR(&pin_GPIO29) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
 };
 MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/raspberrypi/boards/pimoroni_plasma2040/pins.c b/ports/raspberrypi/boards/pimoroni_plasma2040/pins.c
index 5f685a3528..5ecc44619a 100644
--- a/ports/raspberrypi/boards/pimoroni_plasma2040/pins.c
+++ b/ports/raspberrypi/boards/pimoroni_plasma2040/pins.c
@@ -39,5 +39,6 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_CURRENT_SENSE), MP_ROM_PTR(&pin_GPIO29) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
 };
 MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/raspberrypi/boards/sparkfun_pro_micro_rp2040/pins.c b/ports/raspberrypi/boards/sparkfun_pro_micro_rp2040/pins.c
index bc7cb048de..f4ebe33e8b 100644
--- a/ports/raspberrypi/boards/sparkfun_pro_micro_rp2040/pins.c
+++ b/ports/raspberrypi/boards/sparkfun_pro_micro_rp2040/pins.c
@@ -40,6 +40,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_NEOPIXEL), MP_ROM_PTR(&pin_GPIO25) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/raspberrypi/boards/sparkfun_thing_plus_rp2040/pins.c b/ports/raspberrypi/boards/sparkfun_thing_plus_rp2040/pins.c
index a72342c86a..22dccc66bb 100644
--- a/ports/raspberrypi/boards/sparkfun_thing_plus_rp2040/pins.c
+++ b/ports/raspberrypi/boards/sparkfun_thing_plus_rp2040/pins.c
@@ -59,6 +59,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_LED), MP_ROM_PTR(&pin_GPIO25) }, // on-board LED (separate/additional from neopixel)
 
     { MP_ROM_QSTR(MP_QSTR_I2C),  MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI),  MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
diff --git a/ports/stm/boards/feather_stm32f405_express/pins.c b/ports/stm/boards/feather_stm32f405_express/pins.c
index b039b0af0c..ade7036d5c 100644
--- a/ports/stm/boards/feather_stm32f405_express/pins.c
+++ b/ports/stm/boards/feather_stm32f405_express/pins.c
@@ -45,6 +45,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
 
     { MP_ROM_QSTR(MP_QSTR_NEOPIXEL), MP_ROM_PTR(&pin_PC00) },
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 
diff --git a/ports/stm/boards/sparkfun_stm32_thing_plus/pins.c b/ports/stm/boards/sparkfun_stm32_thing_plus/pins.c
index 3c1d41b42a..df7040ce0a 100644
--- a/ports/stm/boards/sparkfun_stm32_thing_plus/pins.c
+++ b/ports/stm/boards/sparkfun_stm32_thing_plus/pins.c
@@ -47,6 +47,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_D0), MP_ROM_PTR(&pin_PB11) },
 
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },