ATA6621_06 Datasheet, PDF (1/27 Pages) ATMEL Corporation – LIN Transceiver with 5V Regulator and Watchdog

Features
• Supply Voltage up to 40V
• Operating Voltage V_S = 5V to 18V
• Slew Rate Control according to LIN Specification 2.0
• Supply Current during Sleep Mode Typically 10 µA
• Supply Current in Silent Mode Typically 40 µA
• Linear Low-drop Voltage Regulator:
– Normal Mode: V_CC = 5V ±2%/50 mA
– Silent Mode: V_CC = 5V ±7%/50 mA
– Sleep Mode: V_CC is Switched Off
• V_CC Undervoltage Detection (10 ms Reset time) and Watchdog Reset Logically
Combined at Output NRES
• Possibility of Boosting the Voltage Regulator with an External NPN Transistor
• LIN Physical Layer according to LIN Specification 2.0
• Wake-up Capability via LIN Bus or WAKE Pin
• Wake-up Recognition
• TXD Time-out Timer
• Debug Mode Watchdog Is Switched Off
• 60V Load Dump Protection at LIN Pin
• Bus Pin is Overtemperature and Short Circuit Protected versus GND and Battery
• Adjustable Watchdog Time via External Resistor
• Positive and Negative Trigger Input for Watchdog
• 5V CMOS Compatible I/O Pins to MCU
• Analog Temperature Monitor Output
• High EMC and ESD Level
• Package: QFN 5 × 5 with 20 Pins
LIN Transceiver
with 5V
Regulator and
Watchdog
ATA6621
1. Description
The ATA6621 is a fully integrated LIN transceiver, complying with the LIN specifica-
tion, and with a low-drop voltage regulator for 5V/50 mA output and a window
watchdog adjustable via an external resistor. In this QFN20 package, the voltage reg-
ulator is able to source 50 mA at V_S = 18V even at an ambient temperature of 105°C.
The output current of the regulator can be boosted by using an external NPN transis-
tor. This combination makes it possible to develop simple, but powerful and cheap,
slave nodes in LIN bus systems. ATA6621 is designed to handle the low speed data
communication in vehicles, for example, in convenience electronics. Improved slope
control at the LIN driver ensures secure data communication up to 20 kBaud. The bus
output is capable of withstanding 60V. Sleep Mode and Silent Mode guarantee a very
low current consumption.
4887D–AUTO–12/06