MCP23S08T-E/SS

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MCP23S08T-E/SS

IC I/O EXPANDER SPI 8B 20SSOP

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Spezifikationen

Supplier Microchip Technology
Package Tape & Reel (TR),Cut Tape (CT)
ProductStatus Active
NumberofI/O 8
Interface SPI
InterruptOutput Yes
Features POR
OutputType Push-Pull
Current-OutputSource/Sink 25mA
ClockFrequency 10 MHz
Voltage-Supply 1.8V ~ 5.5V
OperatingTemperature -40°C ~ 125°C
MountingType Surface Mount
Package/Case 20-SSOP (0.209, 5.30mm Width)

Übersicht

Description

The MCP23S08T-E/SS is Microchip’s 8-bit SPI I/O expander. It adds eight bidirectional GPIO pins (GPA0–GPA7) to a microcontroller over a SPI bus, freeing MCU pins for other tasks.
Key features:
- 2.0–5.5 V operation, SPI mode 0 (SCK, SI, SO, CS), up to ~10 MHz
- 8 GPIOs with a register-based interface
- Hardware addressing: A0–A2 pins plus HAEN in IOCON enable multiple devices on the same bus
- Registers: IODIR, IPOL, GPINTEN, DEFVAL, INTCON, IOCON, GPPU, INTF, INTCAP, GPIO, OLAT
- Interrupt output (INT)
How it works:
- Use opcode 0100 A2 A1 A0 R/W to access registers
- IODIR sets direction (0 = output, 1 = input)
- GPPU enables pull-ups for inputs
- GPIO/OLAT read/write data
- INTF/INTCAP monitor interrupts; read GPIO to sample state
Packaging:
- RoHS-compliant small-outline package (-SS)
Applications:
- Extend digital I/O for MCUs, LED drivers, button matrices, sensor interfaces, etc.

Features

Key features of MCP23S08T-E/SS (SPI I/O expander):
- 8-bit I/O expander with SPI interface; 8 bidirectional I/O pins.
- Registers for full control: IODIR (direction), IPOL (polarity inversion), GPPU (pull-ups), GPIO, OLAT (output latch), DEFVAL, INTCON, GPINTEN.
- Interrupt capability: INT output with configurable interrupt-on-change (GPINTEN, INTCON, DEFVAL).
- IOCON register for configuration (sequential operation, interrupt polarity, etc.).
- Hardware addressing: A0–A2 pins allow up to 8 devices on the same SPI bus (opcode: 0100 A2 A1 A0 R/W).
- SPI interface: SCK, SI, SO, CS; up to ~10 MHz clock; supports standard SPI modes.
- Read/modify/write safety via OLAT (latched outputs) separate from GPIO.
- Power supply and temp: VDD typically 1.8–5.5 V; industrial temperature range (-40°C to 125°C).
- RoHS-compliant; available in TSSOP/SS packaging variants.
- Applications: I/O expansion for microcontrollers, high-side/low-side switching, sensor interfacing, and remote control.

Package

MCP23S08T-E/SS is in a 16‑pin Small Outline (SSOP) package. The “/SS” suffix denotes the SSOP package type.

Pinout

Pin count: 16 pins (in the SSOP‑16/SOIC‑16 package; -T indicates Tape & Reel).
Function: 8‑bit SPI I/O expander. Adds eight bidirectional GPIOs to the host and is controlled over SPI (SCK, SI, SO, CS) with registers for IODIR, IPOL, GPINTEN, DEFVAL, INTCON, IOCON, GPIO, OLAT; includes an interrupt output and an active‑low RESET. VDD and VSS provided as well.

Manufacturer

- Manufacturer: Microchip Technology Inc.
- What kind of company: An American multinational semiconductor company that designs and manufactures integrated circuits (ICs), including microcontrollers, memory, and analog devices (an Integrated Device Manufacturer).

Application

- 8-bit SPI GPIO expansion for microcontrollers with limited pins
- LED driving, keypad/switch input, relay/driver control
- Industrial and building automation
- Instrumentation and test benches
- Prototyping and hobbyist projects needing more I/O with low pin usage
- Event-driven designs using interrupt-on-change for responsiveness

Equivalent

Direct drop-in equivalents don’t exist, but close SPI GPIO expanders are:
- Maxim Integrated MAX7310 / MAX7311 / MAX7312 (8-bit SPI I/O expanders)
- For more bits: Microchip MCP23S17 (16-bit SPI I/O expander)
- If a shift-register approach is acceptable: 74HC595 / 74HC165 (not exact GPIO expanders, but can extend I/O)
Use MAX7310-family as the nearest cross-reference to MCP23S08T-E/SS.

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