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.
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: