The STMPE1801 is a GPIO port expander capable of interfacing a main digital ASIC via the two-line bidirectional bus (I2C). It 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 power consumption. Potential applications include portable media players, game consoles, mobile phones, and smart phones.
The STMPE1801 is an 18-bit enhanced port expander with a keypad controller designed to interface with a main digital ASIC via the two-line bidirectional I2C bus. It features 18 GPIOs configurable as general-purpose inputs/outputs, keypad matrix rows/columns, or dedicated key functions. The device includes a hardware keypad controller capable of detecting keypresses even in hibernation mode.
| Operating voltage | 1.65 - 3.6 V |
|---|---|
| GPIO count | 18 |
| Keypad matrix size | 10 x 8 |
| Package type | Flip-chip CSP 25 |
| ESD performance (GPIO) | +8kV HBM |
| Operating ambient temperature | -40 to 85 °C |
The device operates with a voltage between 1.65 V and 3.6 V.
The hardware keypad controller supports a maximum of 4 optional dedicated keys.
The reset pulse width must be more than 500 us to be valid.