Automotive LIN Network Solution Based on ATA663254

　　Atmel's ATA663254 is a fully integrated LIN transceiver designed to meet LIN standards 2.0A, 2.1A, 2.2A, 2.2A and SAEJ2602-2, and integrates a low-dropout 5V/85mA regulator, with a power supply voltage of up to 40V, an operating voltage of 5V~28V, and a sleep mode current of 9μA.

　　This voltage regulator is a fully integrated low dropout regulator with 5V output voltage and 85mA current. It is designed for automotive environment. One of its important features is that its current consumption is always less than 170μA (no load), even if the supply voltage is lower than the rated output voltage of the regulator.

　　ATA663254 Key Features

　　● Maximum power supply voltage 40V

　　● Working voltage VS = 5V ~ 28V

　　● Power supply current

　　● Sleep mode, typically 9μA

　　● Silent mode, typical 47μA

　　● At low power supply voltage (2V

　　● Linear low dropout regulator, 85mA current

　　● MLC(2) capacitor, 0ΩESR

　　● Normal, fail-safe and silent modes

　　● VCC=5.0V±2%

　　Figure 1 ATA663254 block diagram

　　● Sleep mode: VCC is turned off

　　● Minimum working VS=2.3V

　　● VCC undervoltage detection and open-drain reset output (NRES, 4ms reset time)

　　● Voltage regulator short circuit and over temperature protection

　　● LIN physical layer (according to LIN2.0, 2.1, 2.2, 2.2A and SAEJ2602-2)

　　● Wake-up function via LIN bus (100ms dominant position)

　　● Wake-up source identification

　　● TXD timeout timer

　　● Overheat and short circuit protection for bus pins, GND and battery

　　Figure 2 ATA663254 typical application circuit diagram

　　● Advanced EMC and ESD performance

　　● Meet the LIN hardware requirements of original equipment manufacturers (LIN in Automotive applications Rev.1.3)

　　● Interference and damage protection (according to ISO7637)

　　●Packing: DFN8

　　Evaluation Board ATAB663254A-V1.2

　　ATAB663254A-V1.2 is an evaluation tool for quick start of Atmel's 4th generation LIN system basis chip, including LIN transceiver + low dropout 5V/85mA regulator, which can facilitate prototype design and testing.

　　AATAB663254A-V1.2 Key Features

　　● All necessary components to support ATA663254

　　● All pins are available

　　● Master or slave operation selection (D2 and R2 are installed as the default master operation)

　　● Switch to normal, silent or sleep mode via two jumpers

　　● LED is used to indicate operation

　　● Ground plow clamp (for easy probe connection when measuring with an oscilloscope)

　　Figure 3 Circuit diagram of the evaluation board ATAB663254A-V1.2