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MCP23017T-E/SS

16-Bit I2C I/O Expander, 1.7MHz, 1.8-5.5V, 25mA/pin, SSOP-28

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Manufacturer Part：

MCP23017T-E/SS

Package：

SSOP-28 (5.3 x 10.2 x 1.75 mm)

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Description

Product Overview

The MCP23017T-E/SS from Microchip Technology is a 16-bit I/O expander with an I2C serial interface, providing 16 bidirectional GPIO pins in a compact 28-pin SSOP package. It supports I2C bus speeds up to 1.7 MHz and operates from 1.8 V to 5.5 V, making it ideal for expanding I/O capabilities of microcontrollers in space-constrained applications.

Key Specifications

Interface I2C (100 kHz / 400 kHz / 1.7 MHz)
Number of I/Os 16 (Two 8-bit ports)
Operating Voltage 1.8 V to 5.5 V
Max Bus Frequency 1700 kHz
Output Current per Pin 25 mA (sink/source)
Standby Current 1 µA (max)
Hardware Address Pins 3 (up to 8 devices on bus)
Interrupt Outputs 2 (INTA, INTB)
Package SSOP-28 (5.3 x 10.2 mm)
Operating Temperature -40°C to 125°C
Reset Input Yes (active low)

Features

  • 16-bit remote bidirectional I/O port (default to input)
  • High-speed I2C interface: 100 kHz, 400 kHz, 1.7 MHz
  • Three hardware address pins for up to 8 devices on one bus
  • Configurable interrupt output pins (active-high, active-low, open-drain)
  • INTA and INTB configurable independently or mirrored
  • Interrupt-on-change from default values or pin changes
  • Interrupt capture register saves state at interrupt time
  • Polarity inversion register for input data
  • External reset input
  • Low standby current: 1 µA max

Applications

  • Expanding microcontroller GPIO in embedded systems
  • Keypad matrix scanning (up to 8×8)
  • LED display and status indicator control
  • Industrial PLC digital I/O expansion
  • IoT gateway sensor interface expansion

The MCP23017T-E/SS from Microchip Technology is a 16-bit I/O expander with an I2C serial interface that provides 16 general-purpose bidirectional I/O pins organized as two 8-bit ports (PORTA and PORTB). The device supports I2C bus speeds up to 1.7 MHz and operates from 1.8 V to 5.5 V, making it compatible with a wide range of logic levels. Three hardware address pins allow up to 8 devices to share a single I2C bus, providing up to 128 additional I/O pins. Configurable interrupt outputs (INTA/INTB) can report pin changes to the host microcontroller, reducing polling overhead. The device features internal pull-up resistors, polarity inversion, and interrupt capture registers for flexible I/O management.

The MCP23017T-E/SS communicates with a host microcontroller via the I2C protocol. The 7-bit device address is configured using the A0, A1, A2 hardware pins, allowing up to 8 devices on one bus. Internal registers control I/O direction (IODIRA/B), output latches (OLATA/B), input polarity (IPOLA/B), pull-up resistors (GPPUA/B), and interrupt configuration (GPINTENA/B, INTCONA/B, DEFVALA/B). When an input pin changes state, the interrupt system can be configured to assert INTA and/or INTB. The INTCAP register captures the port state at the time of the interrupt. The I2C interface supports standard (100 kHz), fast (400 kHz), and high-speed (1.7 MHz) modes. All registers can be read and written by the I2C master.

Pin Name Type Function
1 GPB0 I/O Port B bit 0
2 GPB1 I/O Port B bit 1
3 GPB2 I/O Port B bit 2
4 GPB3 I/O Port B bit 3
5 GPB4 I/O Port B bit 4
6 GPB5 I/O Port B bit 5
7 GPB6 I/O Port B bit 6
8 GPB7 I/O Port B bit 7
9 VDD Power Power supply
10 VSS Ground Ground
11 NC – No connect
12 SCL Input I2C clock
13 SDA I/O I2C data
14 NC – No connect
15 A0 Input Hardware address bit 0
16 A1 Input Hardware address bit 1
17 A2 Input Hardware address bit 2
18 RESET Input External reset (active low)
19 INTB Output Port B interrupt output
20 INTA Output Port A interrupt output
21-28 GPA0-GPA7 I/O Port A bits 0-7
  • Expanding MCU GPIO for industrial control panels and PLCs
  • Keypad matrix scanning (8×8 = 64 keys)
  • Multi-channel LED status display driving
  • IoT sensor hub with interrupt-driven input monitoring
  • Consumer electronics with limited MCU I/O resources
Manufacturer Part Number Package Notes
Microchip MCP23S17-E/SS SSOP-28 SPI interface variant
NXP PCAL6524 QFN-28 24-bit I2C expander with more features
Texas Instruments TCA6424ARGJR QFN-24 24-bit I2C I/O expander
onsemi NCV8460DR2G SOIC-8 24V high-side switch with diagnostics
Microchip MCP23008T-E/SS SSOP-20 8-bit I2C I/O expander, smaller
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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