Xpander Logic 18-bit enhanced port expander with keypad controller

The STMPE1801 is a GPIO (general purpose input/output) port expander capable of interfacing a main digital ASIC via the two-line bidirectional bus (I2C). A separate GPIO expander IC is often used in mobile multimedia platforms to resolve the problem of the limited number of GPIOs typically available on digital engines.

The STMPE1801 offers high flexibility, as each I/O can be configured as input, output, special key, keypad matrix or dedicated key function. This

device is designed to include very low quiescent current, and a wakeup feature for each I/O, to optimize the power consumption of the device. Potential applications for the STMPE1801 include portable media players, game consoles, mobile and smart phones.

Key Features

  • 18 GPIOs configurable as GPI, GPO, keypad matrix, special key or dedicated key function
  • Operating voltage: 1.65 - 3.6 V
  • Hardware keypad controller (KPC) (10 x 8 matrix with 4 optional dedicated keys maximum)
  • Keypad controller capable of detecting keypress in hibernation mode
  • Interrupt output (open drain) pin
  • Advanced power management system
  • Ultra-low standby mode current
  • Programmable pull-up resistors for all GPIO pins
  • ESD performance on GPIO pins:
    • ± 8 kV human body model (JESD22 A114-C)
  • ESD performance on VCC , GND, INTB , RSTB , SCL, SDA pins:
    • ± 3 kV human body model (JESD22 A114-C)

Circuit Diagram

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Technical Documentation

Product Specifications
Description Version Size
DS6934 DS6934: Xpander Logic™ 18-bit enhanced port expander with keypad controller 3.1 661 KB
Application Notes
Description Version Size
AN3245 AN3245: A hardware and software guide for the STMPE1801 Xpander Logic™ 18-bit enhanced port expander with keypad controller 1.1 342 KB
Support & Community

Sample & Buy

Part Number Package Packing Type Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
STMPE1801BJR Chip Scale Package 0.4mm pitch Tape And Reel Active - - NEC EAR99 CHINA MORE INFO No availability reported, please contact our Sales office

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STMPE1801BJR ActiveChip Scale Package 0.4mm pitchIndustrialEcopack2 0 0

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.