PCF8574-150MIL I2C Port Expander IC SOP16

Description

PCF8574-150MIL I2C Port Expander IC SOP16

PCF8574-150MIL Key Specifications

Manufacturer: NXP Semiconductors (also TI and clones)
Package: SOP-16 (150-MIL body width)

1. Electrical Characteristics

• Supply Voltage: 2.5V to 6V (wide range)

• I²C Bus Voltage: Tolerant up to 6V (even with VDD = 2.5V)

• I/O Ports: 8 bidirectional I/O pins (quasi-bidirectional)

• Sink Current: 25mA per I/O (max)

• I²C Speed: 100kHz (Standard-mode) or 400kHz (Fast-mode)

• Power Consumption: 10µA (standby, typical)

2. I²C Addressing

• 7-bit address: 0x20–0x27 (configurable with A0-A2 pins)

• Address Pins: A0, A1, A2 (set to GND or VDD)

• Read Address: 0x41 (if A0-A2 = GND)

• Write Address: 0x40 (if A0-A2 = GND)

3. Pinout (SOP-16)

4. Key Features

• Quasi-bidirectional I/Os: No direction control needed.

• Interrupt Output: INT pin goes low on port change (for efficient polling).

• Latched Outputs: Maintain state between I²C writes.

• High Current Drive: Can directly drive LEDs or relays.

5. Applications

• Adding I/O ports to microcontrollers (Arduino, ESP32, etc.)

• Keypad scanning

• LED dimming control

• Sensor arrays

6. SOP-16 Package Dimensions

• Body Width: 150 MIL (3.81mm)

• Lead Pitch: 1.27mm

Design Notes

1. Pull-Up Resistors:

   • SCL/SDA: 4.7kΩ to VDD (required for I²C).

   • INT: 10kΩ to VDD (optional but recommended).

2. Current Limiting:

   • Add series resistors for LEDs (e.g., 330Ω for 5V).

3. Interrupt Handling:

   • Connect INT to MCU interrupt pin for efficient input monitoring.