Overview
The STMPE811QTR, produced by STMicroelectronics, is an advanced resistive touchscreen controller integrated with an 8-bit general purpose input/output (GPIO) port expander. This device is designed to interface with a main digital ASIC via a two-line bidirectional bus, supporting both I2C and SPI interfaces. It is particularly useful in mobile multimedia platforms where the limited number of GPIOs on the digital engine is a constraint. The STMPE811QTR offers low quiescent current and includes a wakeup feature for each I/O to optimize power consumption.
Key Specifications
| Parameter | Description |
|---|---|
| Operating Voltage | 1.8 - 3.3 V |
| Interface | I2C and SPI |
| GPIOs | 8-bit GPIO expander |
| Touchscreen Controller | Integrated 4-wire resistive touchscreen controller |
| ADC | 8-input 12-bit ADC |
| ESD Protection | 25 kV air-gap ESD protection (system level), 4 kV HBM ESD protection (device level) |
| Package | QFN16 (3x3 mm) |
| Operating Temperature | -40 °C to 85 °C |
Key Features
- 8-bit GPIO port expander with each I/O configurable as input, output, or specific functions
- Integrated 4-wire resistive touchscreen controller with movement tracking algorithm and 128-depth buffer
- SPI and I2C interface support, with up to 2 devices sharing the same bus in I2C mode
- Interrupt output pin and wakeup feature on each I/O for power optimization
- Low quiescent current and ESD protection (25 kV air-gap, 4 kV HBM)
- Temperature sensor and driver and switch control unit
Applications
- Portable media players
- Game consoles
- Mobile and smartphones
- GPS devices
Q & A
- What is the primary function of the STMPE811QTR?
The primary function of the STMPE811QTR is to serve as an 8-bit GPIO port expander and an integrated 4-wire resistive touchscreen controller.
- What interfaces does the STMPE811QTR support?
The STMPE811QTR supports both I2C and SPI interfaces.
- What is the operating voltage range of the STMPE811QTR?
The operating voltage range is 1.8 - 3.3 V.
- How many GPIOs does the STMPE811QTR have?
The STMPE811QTR has an 8-bit GPIO expander.
- What kind of ESD protection does the STMPE811QTR offer?
The STMPE811QTR offers 25 kV air-gap ESD protection (system level) and 4 kV HBM ESD protection (device level).
- What is the package type of the STMPE811QTR?
The package type is QFN16 (3x3 mm).
- What are the typical applications of the STMPE811QTR?
Typical applications include portable media players, game consoles, mobile and smartphones, and GPS devices.
- Does the STMPE811QTR have any power-saving features?
Yes, it includes a wakeup feature on each I/O to optimize power consumption.
- Is the STMPE811QTR still in production?
No, the STMPE811QTR is listed as obsolete and no longer manufactured.
- What is the resolution of the ADC in the STMPE811QTR?
The ADC has a resolution of 12 bits.
