71 lines
4.7 KiB
Markdown
71 lines
4.7 KiB
Markdown
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# SparkFun MicroMod nRF52840 Processor
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Featuring the nRF52840 SoC from Nordic Semiconductor, the [SparkFun MicroMod nRF52840 Processor](https://www.sparkfun.com/products/16984) offers a powerful combination of ARM Cortex-M4 CPU and 2.4 GHz Bluetooth transceiver in the MicroMod form-factor with the M.2 MicroMod connector to allow you to plug in a compatible MicroMod Carrier Board with any number of peripherals.
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The MicroMod nRF52840 Processor features the same Raytac MDBT50Q-P1M found on our [Pro nRF52840 Mini](https://www.sparkfun.com/products/15025). This module includes an integrated trace antenna, fits the IC to an FCC-approved footprint along with including decoupling and timing mechanisms that would need to be designed into a circuit using the bare nRF52840 IC. The Bluetooth transceiver included on the nRF52840 boasts a BT 5.1 stack and supports Bluetooth 5, Bluetooth mesh, IEEE 802.15.4 (Zigbee & Thread) and 2.4Ghz RF wireless protocols (including Nordic's proprietary RF protocol) allowing you to pick which option works best for your application.
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We've also routed two I<sup>2</sup>C buses, 2 SPI buses, eleven GPIO, dedicated digital, analog, PWM & PDM pins along with multiple serial UARTS to cover nearly all of your peripheral needs.
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## CircuitPython Pin Defs
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CircuitPython pin definitions, while simialr to other boards represent a slight departure from just the typical `A` and `D` pin definitions. The majority of general pins are labled as `G` (or alternatively, `BUS`,) as the MicroMod system they build on uses those names to specify pins that may not be specficially analog or digital.
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This can be somewhat confusing, especially around the analog pins. Here's a quick pin-map. This pin map will use the label either on the [SparkFun MicroMod ATP Carrier Board](https://www.sparkfun.com/products/16885), or the pin name on the [graphical datasheet](https://cdn.sparkfun.com/assets/learn_tutorials/1/4/0/1/MicroMod_nRF52840_v1.0_Graphical_Datasheet.pdf). Some of the aditional aliases are just names to make naming consistent (e.g.: RTS/CTS), but they also can refer to additional functionality a pin may have (e.g.: NFC pins)
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MicroMod Pin # | ATP Pin Label | Pin Definition | Additional Definitons | Pin/Port Reference | Notes
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:--------------|:--------------|:--------------|:-----------------------|:-------------------|:------
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8 | G11 | | | (Not Connected) |
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10 | D0 | D0 | | P0_27 |
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11 | BOOT | BOOT | BUTTON1 | P0_07 |
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12 | SDA | SDA | | P0_08 |
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13 | RTS1 | RTS | RTS1 | P1_02 |
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14 | SCL | SCL | | P0_11 |
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15 | CTS1 | CTS | CTS1 | P1_09 |
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16 | /I2C INT | I2C_INT | P0_15 |
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17 | TX | TX | TX1 | P1_03 |
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18 | D1 | D1 | CAM_TRIG | P1_08 |
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19 | RX | RX | RX1 | P1_10 |
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20 | RX2 | RX2 | | P1_05 |
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22 | TX2 | TX2 | | P1_07 |
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32 | PWM0 | PWM0 | P0_06 |
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34 | A0 | A0 | ADC0 | P0_04 | Attached to AIN2
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38 | A1 | A1 | ADC1 | P0_05 | Attached to AIN3
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40 | G0 | G0 | BUS0 | P0_29 | Attached to AIN5
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42 | G1 | G1 | BUS1 | P0_03 | Attached to AIN1
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44 | G2 | G2 | BUS2 | P1_13 |
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46 | G3 | G3 | BUS3 | P1_12 |
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47 | PWM1 | PWM1 | P0_16 |
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48 | G4 | G4 | BUS4 | P1_11 |
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49 | BATT_VIN | BATT_VIN3 | | P0_30 | Attached to AIN6, will be battery voltage / 3. |
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50 | PDM_CLK | PDM_CLK | | P0_25 |
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51 | SDA1 | SDA1 | | P1_01 |
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52 | PDM_DATA | PDM_DATA | | P0_26 |
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53 | SCL1 | SCL1 | | P0_24 |
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55 | /CS | CS | | P0_20 |
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57 | SCK | SCK | | P0_28 | Attached to AIN4
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59 | COPI | COPI | MOSI | P0_31 | Attached to AIN7
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61 | CIPO | CIPO | MISO | P0_02 |
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63 | G10 | G10 | NFC2, ADC_DP, CAM_VSYNC | P0_10 | Attached to NFC2
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65 | G9 | G9 | NFC1, ADC_DM, CAM_HSYNC | P0_09 | Attached to NFC1
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67 | G8 | G8 | | P1_14 |
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69 | G7 | G7 | BUS7 | P1_04 |
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71 | G6 | G6 | BUS6 | P1_06 |
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73 | G5 | G5 | BUS5 | P0_15 |
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## Peripheral Naming
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CircuitPython attempts to stay in line with the naming of the serial peripheral naming in the MicroMod system. The bare UART pins are also named <pin>1. The UART 2 pins are named <pin>2. However, the I2C names on MicroMod are <I2C pin> and <I2C pin>1. Perhaps this will change in the future, but as of [Interface v1](https://cdn.sparkfun.com/assets/learn_tutorials/1/2/0/6/SparkFun_MicroMod_Interface_v1.0_-_Pin_Descriptions.pdf), it may lead to some confusion.
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## Bootloader Notes
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The MicroMod nRF52840 Processor needs to have the [Adafruit nRF52 UF2 bootloader](https://github.com/adafruit/Adafruit_nRF52_Bootloader/pull/194) flashed on it. [[TODO: LINK TO BUILD]]
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## Hardware Reference
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The MicroMod nRF52840 Processor hardware layout is open source:
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* [Schematic](https://cdn.sparkfun.com/assets/f/0/9/9/e/MicroMod_Processor_Board-nRF52840.pdf)
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* [Eagle Files](https://cdn.sparkfun.com/assets/3/0/5/d/a/MicroMod_Processor_Board-nRF52840.zip)
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* [Hookup Guide](https://learn.sparkfun.com/tutorials/micromod-nrf52840-processor-hookup-guide)
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