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MCP23017T-E/SO

16-bit I2C I/O expander, 1.7MHz, 1.8-5.5V, 25mA/pin, SOIC-28

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Manufacturer Part：

MCP23017T-E/SO

Package：

SOIC-28 (7.5 x 17.9 mm)

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Description

Product Overview

The MCP23017T-E/SO from Microchip Technology is a 16-bit I/O expander with I2C interface, providing 16 bidirectional I/O pins with interrupt outputs in SOIC-28 package. With three address pins supporting up to 8 devices on one bus, it expands GPIO capability for microcontrollers with limited I/O resources.

Key Specifications

I/O Channels 16 (two 8-bit ports)
Interface I2C (up to 1.7MHz)
Supply Voltage 1.8V to 5.5V
I/O Current per Pin 25 mA (sink/source)
Address Pins 3 (up to 8 devices on bus)
Interrupt Outputs 2 (INTA, INTB)
Standby Current 1 μA (max)
Operating Temperature -40°C to +125°C
Package SOIC-28

Features

  • 16-bit remote bidirectional I/O with polarity inversion register
  • Standard I2C interface supporting up to 1.7MHz (HS-mode)
  • Three hardware address pins for up to 8 devices on the same I2C bus
  • Configurable interrupt outputs (active-high, active-low, or open-drain)
  • Interrupt-on-change from default or pin level changes
  • External reset input and low 1μA standby current

Applications

  • GPIO expansion for I2C-based embedded systems
  • Keypad and matrix scanning interfaces
  • LED display driving and indicator control
  • Industrial panel I/O modules
  • Home automation relay and sensor expansion

The MCP23017T-E/SO from Microchip Technology is a 16-bit general-purpose I/O expander that uses the I2C serial interface to communicate with a host microcontroller. It provides 16 bidirectional I/O pins organized as two 8-bit ports (PORTA and PORTB), each with independently configurable data direction, polarity inversion, pull-up resistors, and interrupt-on-change capability. Three hardware address pins (A0-A2) allow up to 8 MCP23017 devices on a single I2C bus, providing up to 128 additional I/O pins. The I2C interface supports clock rates up to 1.7MHz in high-speed mode and operates from 1.8V to 5.5V over the -40°C to +125°C temperature range.

The MCP23017 operates through three functional subsystems. (1) The I2C communication interface receives and transmits data via the SCL and SDA pins using standard I2C protocol with 7-bit device addressing (address = 0b0100+A2+A1+A0). The interface supports standard (100kHz), fast (400kHz), and high-speed (1.7MHz) modes. (2) The register array consists of 22 configuration and data registers including IODIRA/B (direction), GPINTENA/B (interrupt-on-change), DEFVALA/B (default value), INTCONA/B (interrupt control), IOCON (configuration), GPIOA/B (port data), and OLAT/B (output latch). (3) The I/O port logic drives the 16 bidirectional pins based on register settings, with interrupt-on-change monitoring and configurable INTA/INTB output signals.

Pin Name Function
1 GPB0 Port B I/O bit 0
2-8 GPB1-GPB7 Port B I/O bits 1-7
9 VDD Power supply (1.8-5.5V)
10 VSS Ground
11 SCL I2C clock input
12 SDA I2C data I/O
13-15 A0-A2 Address select inputs
16 RESET Hardware reset (active low)
17 INTB Port B interrupt output
18 INTA Port A interrupt output
19-28 GPA0-GPA7 Port A I/O bits 0-7
  • Expanding I2C-based microcontroller GPIO for multi-switch and sensor interfaces
  • Keypad matrix scanning in access control and security systems
  • LED panel driving with 25mA per pin current capability
  • Industrial PLC I/O modules with interrupt-driven change detection
  • Home automation relay boards with I2C bus expansion
Model Manufacturer Key Difference
MCP23S17T-E/SO Microchip SPI interface version (10MHz)
MCP23017T-E/SS Microchip SSOP-28 package option
PCA9555DBR NXP 16-bit I2C I/O expander, TSSOP-24
SX1509 Semtech 16-bit I2C expander with LED driver
MAX7317ATG+ Maxim 10-port I2C expander with PWM
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