Compute Module Interposers
- Sherif Eid
Overview
R1000AX includes a footprint to mount a compute module that connects that system to the internet. The port gives access to the microcontroller's SWDIO, SWCLK, NRESET and ISP, that allows remote firmware upload and debug. It also gives access to the main I2C bus that communicates with all modules, this is useful in case the compute module needs to communicate directly with the modules.
Currently the following interposers are available:
R1100 - C.H.I.P. Pro Interposer
R1101 - particle.io photon Interposer
R1102 - particle.io electron Interposer
R1000AX Compute Module Pinout
The table shows the pin description and how they're connected to different modules
| Pin | Description | R1100 C.H.I.P. Pro | R1101 Photon | R1102 Electron |
|---|---|---|---|---|
| SWDIO | LPC1769 Single wire debug IO | PD5 (16) | A2 (10) | A2 |
| SWDCLK | LPC1769 Single wire debug clock | PD4 (15) | A3 (9) | A3 |
| P0[2]-TXD0 | LPC1769 UART0 transmitter, connect to compute module receiver | PD3 (14) | RX (4) | RX |
| P0[2]-RXD0 | LPC1769 UART0 receiver, connect to compute module transmitter | PD2 (13) | TX (3) | TX |
| SDA | I2C Data | PB16 (12) | D0 (13) | D0 |
| SCK | I2C Clock | PB15 (11) | D1 (14) | D1 |
| #ISP | LPC1769 In system programming - places LPC1769 into manufacturer bootloader mode when forced low during reset | PG13 (10) | A4 (8) | A4 |
| #RESET | LPC1769 reset pin | PB2 (9) | A5 (7) | A5 |
| NC | Not connected | - | - | - |
| NC | Not connected | - | - | - |
| GND | Ground | GND (1,6) | GND (2) | GND |
| PWRON | Compute module button, has different functions for different modules | PWRON (5) | #RST (13) | #RST |
| 5V | Compute module 5V supply | CHG-IN (4) | VIN (1) | VIN |
| NC | Not connected | - | - | - |
| NC | Not connected | - | - | - |
| GND | Ground | GND (1,6) | GND (2) | GND |
| USB1- | LPC1769 USB port D- | USB0-UDM0 (52) | USB- (30)[1] | - |
| USB1+ | LPC1769 USB port D+ | USB0-UDP0 (51) | USB+ (31)[1] | - |
[1] pin is connected through a resistor option (normally unconnected), the photon microcontroller has the capability for a host/OTG/slave USB
R1100 - C.H.I.P. Pro Interposer Schematic
R1101 - particle.io photon Interposer Schematic
R1102 - particle.io electron Interposer Schematic
