External Connections
This page describes the external available connections of the TTC module.
In the image below, all the external connections are enumerated.
A brief description of each connection is presented in the following table:
| Connection Number | Connector | Description |
|---|---|---|
| 1 | Male pin header (1x2) | UART TX @4800 bps. These pins transmit the beacon packets over a serial connection (It is enable in the configuration file, setting the "BEACON_RADIO" variable as "UART_SIM"). |
| 2 | Male pin header (1x2) | Debug UART TX/RX @115200 bps. These pins transmit a description of the main events of the beacon software during it's execution. This feature is only available in "DEBUG_MODE". |
| 3 | Male PicoBlade™ (x6) | JTAG and Debug. This connection contains the relevant pins of the connectors 2 and 4. |
| 4 | Male pin header (2x7) | MSP430 JTAG. This connection is for programming the uC code, using a MSP-FET debugger. |
| 5 | Male PicoBlade™ (x6) | Antenna I2C. I2C bus for a communication channel with the antenna module. |
| 6 | Male pin header (1x2) | Power supply jumper. With a jumper, the beacon microcontroller power source comes from the JTAG connector. Without a jumper, the uC power supply comes from a pin of the PCI-104 connector. |
| 7 | Female Angled MCX | 437 MHz band RF signal (Goes to the antenna module). |
| 8 | Female Angled MCX | 145 MHz band RF signal (Goes to the antenna module). |
| 9 | Male/Female PCI-104 | PCI-104. Power supply and communication buses with others stacked up modules. This connection is better described here. |
OBS.: The connections 1, 2, 4 and 6 were designed to be used during the software development stage, and not during the satellite operation.
The following table describes the PCI-104 connector used pins. The first column is the row number of the connector, and the remaining columns are the respective columns (Named as H1A, H1B, H2A and H2B respectively).
| Row | H1A | H1B | H2A | H2B |
|---|---|---|---|---|
| 1 | GND | GND | GND | GND |
| 2 | GND | GND | GND | GND |
| 3 | - | - | UART RX @4800 bps from the EPS module. | - |
| 4 | Telemetry radio module GPIO0 | Telemetry radio module GPIO1 | - | - |
| 5 | Telemetry radio module GPIO2 | Enable beacon radio module power supply | - | - |
| 6 | Telemetry radio module SDN | - | OBDH communication (SPI MOSI) | OBDH communication (SPI clock) |
| 7 | - | - | OBDH communication (SPI chip select) | OBDH communication (SPI MISO) |
| 8 | - | - | - | - |
| 9 | - | - | - | - |
| 10 | - | - | - | - |
| 11 | - | - | - | - |
| 12 | - | - | - | - |
| 13 | - | - | - | - |
| 14 | - | - | Beacon uC power supply (3,3 V/50 mA) | 3,3 V beacon uC power supply (3,3 V/50 mA) |
| 15 | GND | GND | GND | GND |
| 16 | GND | GND | GND | GND |
| 17 | - | - | - | - |
| 18 | Telemetry radio module SPI clock | - | - | - |
| 19 | Telemetry radio module SPI MISO | - | - | - |
| 20 | Telemetry radio module SPI MOSI | Telemetry radio module SPI chip select | - | - |
| 21 | - | - | - | - |
| 22 | - | - | - | - |
| 23 | - | - | - | - |
| 24 | - | - | - | - |
| 25 | Telemetry radio module power supply (5 V/500 mA) | - | - | - |
| 26 | Beacon radio module power supply (5 V/500 mA) | - | - | - |
OBS.: If the pin has no description, it is not connected to the TTC board.