PD76-UM7 (7 JXM modules)
General description
The PD76-UM7 motherboard is designed to accommodate up to 7 universal JXM expansion modules.
There are two RP-SMA connectors for connecting an external antenna, in the case when the JXM module has a radio chip.
Restrictions
- The operation of peripherals depends on the processor module used and the firmware installed on it.
Food
The board (controller) can be powered from a DC source with a voltage of 9 to 56 V.
It is possible to power the controller via the Ethernet connector using Passive PoE technology with a nominal voltage up to 48V or Active PoE.
When using Passive PoE, power is transmitted over unused pairs of the Ethernet cable: pair 4(blue, white-blue) and pair 8 (brown, white-brown). The polarity of the connection does not matter. There is no galvanic isolation of power supply circuits in the controller.
When using Active PoE according to the 802.3af standard, power can be supplied via mode A (pair 4-5 , 8) and in mode B (over data lines, 1, 3-6). The maximum power on the device corresponds to power class 0 (up to 13 W on a PD device). There is no galvanic isolation of power supply circuits in the controller.
A power-up delay of up to 1 second is allowed for power-over-Ethernet.
The PWR terminal is designed to supply power from a DC source with a voltage of 9 to 56 V. It is recommended to use a stabilized DC source with a rated voltage of 12V to 48V and a power of at least 10W to power the controller. However, this power supply method has the highest priority.
This means the following. When the device is powered by PoE (Active or Passive does not matter) when voltage is applied to the PWR terminal, the key turns off the power supply via Ethernet.
Operating conditions
- Ambient temperature: 0..+40 С;
- Relative air humidity up to 80% without moisture condensation;
- Closed explosion-proof rooms without aggressive vapors and gases.
I2C EEPROM
The module has an EEPROM chip AT24C64 or equivalent 64Kbit (8 ).
The purpose of the memory is to store the hardware configuration of the board.
Address on the I2C bus for the processor module - 0x53
Note: Bus addresses are in 7-bit format.
JXM Expansion Modules
The JXM expansion module allows you to add additional peripherals to the controller.
There is space for one JXM module on the controller board. (See documentation for JXM plugins).
All modules are interconnected by I2C and SPI buses. Each JXM module has a separate MOD_SEL signal that can be used as SPI_CS.
5 JXM modules have 3-pin terminals for external connections.
2 JXM modules have 2-pin terminals for external connections. Depending on the module, the pin assignment will change.
Connector specifications:
- Maximum contact current 3 A;
- Maximum voltage 250 V (AC);
- Galvanic isolation up to 1000 V (if the module has galvanic isolation).
UART1, UART2 connectors
A separate optional 4-pin connector is provided on the peripheral board inside the case for connecting the UART port to one of the JXM expansion modules.
Assignment of inputs connector "UART1":
| UART1 header pin | Purpose |
|---|---|
| 1 | SERIAL_ID_VOLTAGE |
| 2 | GND |
| 3 | UART1_TX 40-pin |
| 4 | UART1_RX 40-pin |
The output voltage at pin 1 (SERIAL_ID_VOLTAGE) of the header is used to identify the UART port, and for UART1 is 0.2V. (see "Stress levels")
| UART2 header pinout | Purpose |
|---|---|
| 1 | SERIAL_ID_VOLTAGE |
| 2 | GND |
| 3 | UART2_TX 40-pin |
| 4 | UART2_RX 40-pin |
The output voltage at pin 1 (SERIAL_ID_VOLTAGE) of the header is used to identify the UART port, and for the UART2 port is 0.4V. (cm. "Stress levels")
Connector IO1
The peripheral board inside the case provides a separate optional 4-pin connector for connecting additional GPIOs to the JXM expansion module. This connector can be used, for example, to output a CAN interface.
Purpose of the inputs of the connector "IO1":
| IO1 connector pinout | Purpose |
|---|---|
| 1 | IO_ID_VOLTAGE |
| 2 | GND |
| 3 | GPIO1 40-pin |
| 4 | GPIO2 40-pin |
The output voltage at pin 1 (IO_ID_VOLTAGE) of the connector is used for identification, and for the CAN port is 1.8V. (see "Levels voltage")
Peripheral connector pin assignment
Peripheral connector type 40 pin (20 ×2 pin) with a pitch of 1.27 mm is designed to connect the processor module to the peripheral (motherboard) board.
| Conclusion | Purpose 40 pin | Purpose PD76-UM7 |
|---|---|---|
| 1 | +5.0V | Power supply +5V |
| 2 | +5.0V | Power supply +5V |
| 3 | GND | General |
| 4 | GND | General |
| 5 | ETH_TXN | Connecting an External Transformer to an Ethernet PHY |
| 6 | ETH_TXP | Connecting an External Transformer to an Ethernet PHY |
| 7 | ETH_RXN | Connecting an External Transformer to an Ethernet PHY |
| 8 | ETH_RXP | Connecting an External Transformer to an Ethernet PHY |
| 9 | ETH_LED1 | Connecting an External LED to an Ethernet PHY |
| 10 | ETH_LED0 | Connecting an External LED to an Ethernet PHY |
| 11 | GND | General |
| 12 | SPI_MOSI | Connected to all JXM modules |
| 13 |
GPIO0 |
In MOD_SEL1 |
| 14 | SPI_MISO | Connected to all JXM modules |
| 15 | SPI_CLK | Connected to all JXM modules |
| 16 | GND | General |
| 17 | I2C_SCK | Connected to all JXM modules |
| 18 | I2C_SDA | Connected to all JXM modules |
| 19 | GND | General |
| 20 | UART1_RX | Displayed on the 4 pin of the UART1 connector |
| 21 | UART1_TX | Displayed on the 3rd pin of the UART1 connector |
| 22 | UART2_TX | Displayed on the 3rd pin of the UART2 connector |
| 23 | UART2_RX | Displayed on the 4 pin of the UART2 connector |
| 24 | GND | General |
| 25 | GPIO1 | Routed to the 3rd pin of the IO1 connector |
| 26 | GPIO2 | Routed to the 4 pin of the IO1 connector |
| 27 | GND | General |
| 28 | GPIO3 | Not connected 1 |
| 29 | GPIO4 | MOD_INT |
| 30 | GPIO5 | MOD_SEL2 |
| 31 | GPIO6 | MOD_SEL3 |
| 32 | GPIO7 | MOD_SEL4 |
| 33 | GPIO8 | MOD_SEL5 |
| 34 | GPIO9 | MOD_SEL6 |
| 35 | GPIO10 | MOD_SEL7 |
| 36 | GPIO11 | Not used |
| 37 | CPU_RESET | Not used |
| 38 | GND | General |
| 39 | USB_DN | Not used |
| 40 | USB_DP | Not used |
1 - MOD_INT can be routed to GPIO3 by soldering a resistor.