IT7236: touch button controllers

The IT7236, one MCU-base programmable controller with capacitance sensors, is used to implement functions such as buttons, scroll bars, and wheels. One single electrode capacitance-to-digital converter (CDC) is integrated into this controller. This chip also includes one powerful twin-turbo 8051 CPU along with one 8K bytes of e-Flash ROM to support customer-specified features.

The IT7236 also provides a post-processing with CDC, and it can automatically calibrate and compensate the front-end CDC values for environmental changes. It also modifies the threshold and sensitivity levels automatically. The chip supports one interrupt output indicated that the CDC value over the user programming sensitivity level.

The IT7236 supports one I2C compatible interface to communicate with the host. Through this interface, the host can program the internal controlled registers to configure this chip to meet users’ requirements. Furthermore, GPIO and PWM-Based current-control functions are supported to indicate the specific status or LED dimming by the user’s definition.

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PART NO	PACKAGE TYPE	DESCRIPTION	FLASH SUPPORT

Programmable Capacitance-to-Digital Converter (CDC)
- Maximum 14 capacitance sensor inputs
- 10 ms update rate, all 14 sensor stages (under decimation rate 64)
- No external RC components required
- Automatic conversion sequencer

On-chip Automatic Calibration Logic
- Automatic calibration & compensation for environmental changes
- Automatic adaptive threshold and sensitivity levels

8051 Embedded Controller
- Two clocks per machine cycle architecture
- Instruction set compatible with standard 8051
- Maximum 16 MHz for CPU speed
- Supports CPU power-saving mode

On-chip 8KByte e-Flash ROM
- 8Kx8 e-Flash ROM for internal CPU firmware program
- 100K times program / erase
- Extra 8Kx8 SRAM for saving e-Flash power consumption by launching firmware in e-Flash

Supports High Current General Purpose Input/Output (GPIO) and PWM Function for LED Dimming Control
- up to 6 pins for these functions

Supports Low Current GPIO Function for General Purpose Function Control
- up to 14 pins for these functions at 32-pin QFN (7 pins at 24-pin QFN)

Supports Dynamic Power Saving Mode
- Provides host special commands to switch between two operational modes: active and idle modes

Interface
- I2C Compatible Interface
- One full duplex UART interface

Operation Power
- Two power sources: VCCIO: 1.62V~5.5V, AVCC: 2.25V~5.5V
- Provides one internal power regulator for core power generation

Supports up to Two True 7 bits of DAC (Output 0V~5V or 0V~3.3V voltage range by Power)
- Supports LED driving as well

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IT7236: touch button controllers