Automotive instrument panel development solution based on TMS470PLF221RFPQ1

TMS470PLF221RFPQ1 is  an MCU specially used for developing car instrument panels based on ARM7 core of TI  . It has 6 stepper motor drivers, which can subdivide and control six instrument motors at the same time. At the same time, the chip has a high-performance coprocessor HET, which can generate very accurate timing. With DMA and multi-buffered serial SPI, it can complete the external function design and occupy very few resources. In addition, the chip has built-in CAN and LIN controllers, which is very suitable for the development of car instrument panels. Lierda has currently developed a high-end car instrument panel solution with TFT LCD based on TMS470PLF221RFPQ1.

Project pictures:

Solution diagram:

1. Basic requirements for solution specifications and parameters:

• Operating voltage: VCC 1.8～2.5V

VIO 4.5～6V

•Main frequency: 48MHZ ARM7

•ARM7 core, 16/32-bit RISC instruction system

• Flash: 256KB RAM: 16KB

•Built-in JTAG encryption module JSM

• 1 multi-buffered parallel interface up to 1Mbps, 1 SPI interface, 2 I²C interfaces

•Built-in 1 standard CAN and high-speed CAN bus interface, 1 LIN bus interface

• Built-in support for up to 6 stepper motor drivers

• 22-channel high-end timer HET1 and 24-channel HET2

•Built-in 16-channel 10-bit ADC1 and 6-channel 10-bit ADC2

• Up to 105 I/O ports

• Operating temperature: -40°C~125°C

•Package: LQFP144

2. LCD display part:

The key part of this solution is the driver of the LCD screen. The TMS470PLF221RFPQ1 has an LCDA module inside:

External functions:

A. Power supply design

B. Design principle of instrument stepper motor (software and hardware part)

C. CAN/LIN bus circuit design principle (software and hardware part)