> Complete documentation index: [llms.txt](/llms.txt). Markdown versions of all pages are available by appending `.md` to page URLs. # Binho Pulsar: Hardware reference > Ports and power domains, electrical ratings, target voltage, pinout and status LEDs of the Binho Pulsar. Ports and power domains, electrical ratings, target voltage, pinout and status LEDs of the Binho Pulsar. ## Ports and Power Domains The Pulsar has a USB Type-C port at the rear and four ports at the front for the device under test.
Front of the Binho Pulsar with its four device-under-test ports

The four front ports.

| Port | Connector | Signals | | ------------------ | ------------------------------- | ------------------------------------------ | | USB | USB Type-C | Host PC link and power | | Multifunction Port | 2 × 15 pin, 1.27 mm pitch | I2C bus B, SPI, UART, 6 GPIO, 1-Wire (Nova compatibility mode) | | Dedicated I2C Port | 4-pin JST SH (Qwiic compatible) | I2C bus A | | RS-485 Port | 4-pin JST PH, 2 mm pitch | RS-485 A and B, +5 V | | CAN-FD Port | 4-pin JST PH, 2 mm pitch | CAN+ and CAN−, +5 V | :::note The Dedicated I2C Port and the I2C pins of the Multifunction Port are **two independent buses**, each with its own SDA and SCL. They share only the target voltage rail (VTARG) and ground. In software, the Dedicated I2C Port is **bus A** and the Multifunction Port is **bus B**. ::: The front ports sit on two power domains. Both share ground with each other and with the host PC. | Power domain | Ports | Voltage | | -------------------------- | -------------------------------------- | ------------------------------------------- | | Multifunction Power Domain | Multifunction Port, Dedicated I2C Port | 1.2 V to 3.3 V set from software, or 0 V (off); up to 200 mA | | Differential Power Domain | RS-485 Port, CAN-FD Port | Fixed +5 V, always on, up to 200 mA | I2C, SPI, UART and GPIO share one rail, **VTARG**. Setting the voltage from any of these interfaces sets it for all four. The 1-Wire pin has its own 3.3 V or 5 V rail. ## Electrical Ratings ### Absolute Maximum Ratings :::danger Stresses beyond these ratings may cause permanent damage to the device. ::: | Parameter | Max | | ------------------------------------------------------------ | ------------ | | USB input voltage | 5.5 V | | USB input current | 1000 mA | | Operating temperature | 0 to 70 °C | | ESD rating | ±4000 V | | Multifunction and Dedicated I2C ports, any pin except 1-Wire | 4.2 V | | 1-Wire pin | 5.5 V | | Multifunction Power Domain output current | 250 mA | | RS-485 A, B | −15 to +15 V | | CAN+, CAN− | −42 to +42 V | | Differential Power Domain output current | 250 mA | ### Recommended Operating Conditions | Parameter | Min | Typ | Max | | ---------------------------------------------------- | ----- | ------ | ------ | | USB input voltage | 4.5 V | 5.0 V | 5.5 V | | USB input current | n/a | 500 mA | 1000 mA | | Multifunction Power Domain voltage (input or output) | 1.2 V | 1.8 V | 3.3 V | | Multifunction Power Domain output current | n/a | 100 mA | 200 mA | | 1-Wire pin | n/a | 3.3 V | 5.0 V | | Differential Power Domain output current | n/a | 100 mA | 200 mA | | RS-485 A, B | −7 V | n/a | 12 V | | CAN+, CAN− | −12 V | n/a | 12 V | ## Target Voltage (VTARG) ### If the board has its own supply Do not set a voltage. Tell the Pulsar the rail comes from outside, then read back what it measures: ```python i2c.use_external_voltage() # stop driving VTARG, follow the target print(i2c.get_bus_voltage(), "mV") # the voltage measured on VTARG ``` :::danger On firmware 4.6.x and earlier, a voltage **Set** connects the Pulsar's supply to VTARG even when the board already powers it. Two supplies then fight on the rail. With a self-powered target, use `use_external_voltage()` and never Set a voltage. On those versions, if a voltage was stored with `persist=True` and later set 0 V, the rail can come up at about 3.3 V after a reboot, firmware update or DFU. Disconnect 1.8 V parts before rebooting or updating. ::: Mission Control 3 does not store the voltage across power cycles. Only the SDKs can (`persist=True`). ## Pinout Guide ### Multifunction Port (2 × 15) | Pin | Name | Function | Pin | Name | Function | | --- | ------- | ------------------------------------------- | --- | ----- | ------------------------- | | 1 | SCL | I2C clock (bus B) | 2 | GND | Ground | | 3 | SDA | I2C data (bus B) | 4 | GND | Ground | | 5 | RX | UART receive | 6 | GND | Ground | | 7 | TX | UART transmit | 8 | GND | Ground | | 9 | RTS | UART ready to send | 10 | GND | Ground | | 11 | CTS | UART clear to send | 12 | GND | Ground | | 13 | MOSI | SPI data out (SDO) | 14 | GND | Ground | | 15 | MISO | SPI data in (SDI) | 16 | GND | Ground | | 17 | CLK | SPI clock | 18 | GND | Ground | | 19 | CS0 | SPI chip select 0 or GPIO | 20 | CS1 | SPI chip select 1 or GPIO | | 21 | CS2 | SPI chip select 2 or GPIO | 22 | CS3 | SPI chip select 3 or GPIO | | 23 | GPIO1 | General-purpose I/O | 24 | GPIO2 | General-purpose I/O | | 25 | GPIO3 | General-purpose I/O | 26 | GPIO4 | General-purpose I/O | | 27 | GPIO5 | General-purpose I/O | 28 | GPIO6 | General-purpose I/O | | 29 | VTARG | Target voltage (Multifunction Power Domain) | 30 | 1WIRE | 1-Wire bus | ### Dedicated I2C Port (Qwiic) | 1 - GND | 2 - VTARG | 3 - SDA (bus A) | 4 - SCL (bus A) | | ------- | ----------- | --------------- | --------------- | ### RS-485 Port | 1 - A (non-inverting) | 2 - B (inverting) | 3 - +5 V | 4 - GND | | --------------------- | ----------------- | -------- | ------- | ### CAN-FD Port | 1 - CAN− | 2 - CAN+ | 3 - +5 V | 4 - GND | | -------- | -------- | -------- | ------- | The RS-485 and CAN-FD ports use the same 2 mm JST PH connector, so their cables are interchangeable. For custom fixtures: the Multifunction Port is a standard 2 × 15, 1.27 mm IDC header, and the enclosure has two M3 mounting holes. ## Status LEDs The Pulsar has 5 RGB status LEDs. They show the device mode, its state and bus traffic.