【16-Bit I/O Expansion】 16-bit bidirectional GPIO (8-bit PORTA + 8-bit PORTB) supports independent input/output configuration; 25 mA drive capability directly drives LEDs and small relays; Suitable for microcontroller expansion in smart home and IoT applications
【Wide Voltage Compatibility】 Operates on 1.8V to 5.5V power supply range; supports industrial grade 4.5V to 5.5V at -40°C to 125°C; ensures reliable performance across diverse Settings
【Low Power Design】 Standby current less than 1 µA; 72-hour operation with 2000 mAh battery; suitable for energy-efficient systems requiring minimal power consumption
【Easy I2C Address Setup】 Three hardware address pins (A0/A1/A2) support 8 I2C device cascades (addresses 0x20 to 0x27); eliminates calibration drift with stable address configuration
【Comprehensive Integration Support】 Compatible with for Arduino, for Raspberry Pi, STM32, LabVIEW, and MATLAB; includes interrupt detection and polarity reversal functions; simplifies system design and reduces development time

Key Parameters

Interface Type: I²C serial communication (supports 100kHz/400kHz/1.7MHz modes).

I/O Quantity: 16 bidirectional GPIO pins (PORTA: 8-bit, PORTB: 8-bit), independently configurable as input/output.

Drive Capability: 25mA sink/source per pin (directly drives LEDs, relays, etc.).

Operating Voltage: 1.8V–5.5V DC (Reliable: 4.5V–5.5V @ -40°C to +125°C).

Power Consumption: Standby current ≤1μA (low-power design).

Package: SSOP-28 (surface mount).

Address Configuration: 3 hardware pins (A0/A1/A2), supports 8 cascaded devices (address range 0x20–0x27).

Pin Functions

VDD: Power supply positive (1.8V–5.5V DC).

VSS: Power ground (GND).

SCL: I²C clock line (requires external 4.7kΩ pull-up).

SDA: I²C data line (requires external 4.7kΩ pull-up).

A0/A1/A2: Address configuration pins (ground = 0, VDD = 1).

RESET: Reset input (active low, typically tied to VDD).

INTA/INTB: Interrupt output pins (configurable for port A/B).

GPA0–GPA7/GPB0–GPB7: 16 I/O pins (default: input).

FAQ

1.
How to set I²C address?

Configure A0/A1/A2 pins (e.g., all grounded = address 0x20).

2.
How to enable pull-up resistors?

Set the GPPU register bit (e.g., write 0xFF to GPPUA for port A pull-up).

3.
How to configure interrupts?

Enable GPINTEN register, set INTCON for trigger mode, and connect INTA/INTB to MCU interrupt pins.

4.
Maximum I²C speed?

Supports up to 1.7MHz (use 400kHz for stable operation).

5.
Can it drive relays directly?

Yes (25mA/pin), but add buffers for high-power loads.

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