JXM Expansion Modules
Connector PLD-2x6-2.54 for installing the module in the motherboard
Common slot for all expansion modules.
| Output number | Appointment | Description |
|---|---|---|
| 1 | SLOT_ID0_ADC | To set the slot number. Used by the module to determine the slot number in which it is installed. |
| 2 | SLOT_ID1_ADC | To set the slot number. Used by the module to determine the slot number in which it is installed. |
| 3 | PWR_5V | Power supply +5V |
| 4 | PWR_3V3 | Power supply +3.3V |
| 5 | GND | General |
| 6 | I2C_SCL | I2C bus (common for all modules) |
| 7 | I2C_SDA | I2C bus (common for all modules) |
| 8 | SPI_MOSI | SPI bus (common for all modules) |
| 9 | SPI_MISO | SPI bus (common for all modules) |
| 10 | SPI_SCK | SPI bus (common for all modules) |
| 11 | #MOD_SEL | Chip Select In for SPI module/chip selection (activated by logic low) |
| 12 | #MOD_INT | Interrupt Out from the module (logic low, the circuit must provide "wired OR" operation - "open collector" output) |
Connector PLD-2x2-2.54 for connecting an external terminal
Common slot for all expansion modules.
| Output number | Purpose | Description |
|---|---|---|
| 1 | IO_3 | Connected to external terminal |
| 2 | IO_2 | Connected to external terminal |
| 3 | IO_4 | Routed to external terminal (may not be used for 3-pin module) |
| 4 | IO_1 | Connected to external terminal |
Voltage levels used to identify modules
Levels in the range 0-3.3V are used. Voltage in the range from 0 to 0.1V is not used
TODO: provide guard ranges between slots several ADC samples wide??
| Slot number | Voltage (Voltage range), V | Algorithm for determining (counts 12 -bit ADC) |
|---|---|---|
| - | < 160 | |
| 1 | TODO... | < 324 |
| 2 | < 488 | |
| 3 | < 652 | |
| 4 | < 816 | |
| 5 | < 980 | |
| 6 | < 1144 | |
| 7 | < 1308 | |
| 8 | < 1472 | |
| 9 | < 1636 | |
| 10 | < 1800 | |
| 11 | < 1964 | |
| 12 | < 2128 | |
| 13 | < 2292 | |
| 14 | < 2456 | |
| 15 | < 2620 | |
| 16 | < 2784 | |
| 17 | < 2948 | |
| 18 | < 3112 | |
| 19 | < 3276 | |
| 20 | < 3440 | |
| 21 | < 3604 | |
| 22 | < 3768 | |
| 23 | < 3932 | |
| 24 | < 4096 |
Connector for connecting UART ports
A separate optional connector is used to connect the UART ports to the expansion module if needed.
The purpose of the connector pins on the side of the motherboard:
| Pin number (wire color) | Purpose | Description |
|---|---|---|
| 1 (red) | SERID_ADC | The voltage level by which the slot number is determined |
| 2 (black) | GND | General |
| 3 (yellow) | UART_TX | CPU UART TX |
| 4 (green) | UART_RX | CPU UART RX |
WARNING! A DIRECT cable is used to connect the UART, so the UART RX / TX pin assignment is different on the processor side and on the peripheral side
Purpose of the pins of the UART connector on the side of the module:
| Pin number (wire color) | Purpose | Description |
|---|---|---|
| 1 (red) | SERID_ADC | The voltage level by which the slot number is determined |
| 2 (black) | GND | General |
| 3 (yellow) | UART_RX | Peripheral UART RX |
| 4 (green) | UART_TX | Peripheral UART TX |
CAN connector
A separate optional connector is used to output the CAN bus to the expansion module if required.
Pin assignment of the CAN connector on the side of the motherboard:
| Pin number (wire color) | Appointment | Description |
|---|---|---|
| 1 (red) | SER_ID_ADC | The voltage level by which the slot number is determined (voltage levels other than UART are used) |
| 2 (black) | GND | General |
| 3 (yellow) | CAN_TX | CPU CAN TX |
| 4 (green) | CAN_RX | CPU CAN RX |
Voltage levels used to identify UART/CAN ports
Levels in the range 0-3.3V are used. Voltage in the range from 0 to 0.1V is not used
TODO: provide protection ranges betweenwith slots several ADC samples wide??
| Port | Voltage (voltage range), V |
|---|---|
| UART1 | 0.2 [0.1-0.3) |
| UART2 | 0.4 [0.3-0.5) |
| UART3 | 0.6 [0.5-0.7) |
| USBUART1 | 0.8 [0.7-0.9) |
| USBUART2 | 1.0 [0.9-1.1) |
| USBUART3 | 1.2 [1.1-1.3) |
| USBUART4 | 1.4 [1.3-1.5) |
| USBUART5 | 1.6 [1.5-1.7) |
| CAN1 | 1.8 [1.7-1.9) |
| CAN2 | 2.0 [1.9-2.1) |
| IO1 | 2.2 [2.1-2.3) |
| Reserved | 2.4 [2.3-2.5) |
| Reserved | 2.6 [2.5-2.7) |
| Reserved | 2.8 [2.7-3.9) |
| Reserved | 3.0 [2.9-3.1) |
| Reserved | 3.2 [3.1-3.3) |
I2C
Each module contains a microcontroller operating in I2C slave mode (MOD_MCU). The I2C address of the microcontroller depends on the voltage on the SLOT_ID_ADC pin.
| Slot | Address |
|---|---|
| 1 | 0x60 |
| 2 | 0x61 |
| 3 | 0x62 |
| 4 | 0x63 |
| 5 | 0x64 |
| 6 | 0x65 |
| 7 | 0x66 |
| 8 | 0x67 |
| 9 | 0x68 |
| 10 | 0x69 |
| 11 | 0x6A |
| 12 | 0x6B |
| 13 | 0x6C |
| 14 | 0x6D |
| 15 | 0x6E |
| 16 |
0x6F |
| 17 | 0x70 |
| 18 | 0x71 |
| 19 | 0x72 |
| 20 | 0x73 |
| 0x74 | |
| 22 | 0x75 |
| 23< /td> | 0x76 |
| 24 | 0x77 |
On modules that require I2C to operate, DIP switches can be set to select the address of the main chip. The current address can be found by calling MOD_MCU
Megawin MG82F6D17 pinout
| pin number | Mnemonic | main function | Alternate function |
|---|---|---|---|
| 1 | P6. 1 | GPIO | PWM/TXD1 |
| 2 | P6.0 | GPIO | PWM/RXD1 |
| 3 | GND | ||
| 4 | VR0 | ||
| 5 | +3.3V | ||
| 6 | P1.0 | SLOT_ID0_ADC (JXM connector) | AIN0 |
| 7 | P1. 1 | SLOT_ID1_ADC (JXM connector) | AIN1 |
| 8 | P1.5 | GPIO | AIN5 |
| 9 | P1.6 | GPIO | AIN6 |
| 10 | P1.7 | MOD_SEL (JXM connector) | |
| 11 | P2.2 | I2C0_SCL (JXM connector) | |
| 12 | P2. 4 | I2C0_SDA (JXM connector) | |
| 13 | P3.0 | SER_ID_ADC (Serial connector) | AIN4 |
| 14 | P3. 1 | MOD_INT | |
| 15 | P3.3 | SPI_CLK (JXM connector) | |
| 16 | P3. 4 | SPI_MISO (JXM connector) | |
| 17 | P3.5 | SPI_MOSI (JXM connector) | |
| 18 | RESET | ||
| 19 | P4. 4 | OCD_SCL (JTAG) | RXD0 |
| 20 | P4.5 | OCD_SDA (JTAG) | TXD0 |
MOD_MCU I2C protocol
TODO