Infineon PSoC4 Based Automotive Touch Reading Light Solution

Application Scenario:

Touch buttons are becoming more and more popular in the car cockpit, especially in electric cars, where the touch button coverage is higher, and the market for touch button applications will further expand in the future. This solution is an automotive touch reading light control board. The key devices are Infineon PoC4 MCU, Infineon TLE7259 LIN transceiver.

The functions realized are: LIN communication, backlight driving, touch button detection, switch door status detection, sunroof switch command sending, sunshade switch command sending function. It is applied to various fuel, hybrid and pure electric platform passenger cars at present.

Market Advantages:

This program uses the key chip Infineon PSoC4 series of automotive MCU and Infineon automotive LIN transceiver TLE7259, automotive MCU selected PSoC4 S series, with inductive sensing, can be applied to touch, proximity and other capacitive sensing related applications, PSoC also has a great advantage in touch algorithms, such as waterproof algorithm, Smart Sensing algorithm, etc.

TLE7259 is an automotive LIN transceiver with a transmission bandwidth of 20KBaud, compatible with LIN 1.3, 2.0, 2.1, 2.2 and 2.2A. ESD up to +/- 11kV. Supports wake-up source detection. Compatible with 3.3v and 5v systems with over temperature protection and low voltage detection.

►Scene application diagram

►Display board photo

►Solution cube diagram

►Core Technology Advantage

Key Devices Infineon PSoC4 CY8C4125LQE-S433 Advantages:

1. Automotive-grade high performance: Cortex™-M0+ core, 24MHz main frequency

2. Rich peripheral resources:

- 32KB Flash, 4KB SRAM

- 12-bit 806 Ksps ADC

- Up to 34 I/Os available

- Support SCB (UART, I2C, SPI, LIN), PWM

- Capsense , Inductive sensing

- Temperature range of -40C to +125C

3. Easy to use: Free IDE, graphical configuration interface, perfect API interface, and quick start instructional video for engineers to develop quickly.

Key devices Infineon TLE7259 advantages: 

1. Automotive certification: AEC-Q100 automotive certification

2. Features:

- Transmission bandwidth up to 20kBaud

- LIN1.3, 2.0, 2.1, 2.2, 2.2A compatible

- ESD +/- 1.1kV

- Supports low power sleep mode

- Supports wake-up source detection

- Compatible with 3.3v , 5v systems

- Over temperature protection, low voltage detection

► Solution Specifications

1. 10 Capsense touch buttons

2. Ultra-low sleep power consumption, typical value is 18uA

3. temperature range -40 C to 125C

4. 2 SCB(UART,SPI,I2C)

5. 5 PWM inputs

6. 16 SmartIOs

7. 1 way LIN (Slave mode)