AS8221 High Performance Bus Transceiver General Description The AS8221 is a high-speed automotive transceiver for fault tolerant and high speed applications, operating as the bi-directional interface between a generic communication controller and the twisted pair copper wires. The device enables two-way communications with the microcontroller with full mode handling, including the low-power modes. PRODUCT BRIEF Applications - FlexRay™ networks High speed automotive bus systems Backbone bus and gateways Safety critical applications X-by-wire systems Redundant bus systems Bus topologies with active stars Package: lead-free SSOP20 Key Features Functional Description - Transmission rates up to 10 Mbps as well as the implemented Bus Guardian interface enables this transceiver the usage in fault tolerant and hard realtime applications in the stringent automotive environment. - An extended diagnostic interface, offers advanced busfailure detection capabilities with the intelligent combination of bus-current measurement and logical comparators. A thermal sensor circuit with an integral shutdown mechanism prevents damage to the device in extreme temperature conditions. The symmetrical transient control for the high- and low-side driver for both the bus-minus and bus-plus line allows an ideal balance of communications over different network topologies, with excellent EMC performance. Code: 12643-103-00a - - Data transfer up to 10 Mbps Supports 2.5, 3, 3.3, 5 V microcontrollers and automatically adapts to interface levels Does not disturb the bus line when un-powered Fail silent behaviour Protection against damage due to short circuit conditions on the bus (positive and negative battery voltage) Supports 12, 24, 42 V systems with low sleep current (30 µA) Integrated power management system o Two INH pins for the external voltage o Local wake-up input via STBN-, WAKE- and TxD-Pins o Remote wake-up capability via FlexRay™ bus in sleep mode Operating temperature range -40°C to +125°C Compliant with FlexRay™ Electrical Physical Layer specification - Excellent EMC performance - High common mode range insure excellent signal integrity on diverse bus topologies - Bus guardian Interface for optional bus supervision - Automatic thermal shutdown protection Page 1 of 2 AS8221 High Performance Bus Transceiver PRODUCT BRIEF Pin Description Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Pin Name INH2 INH1 EN VIO TxD TxEN RxD BGE STBN Not used Not used RxEN ERRN VBAT WAKE GND BM BP VCC Not used Pin Type AIO AIO DI_PD S DI_PD DI_PU DO DI_PD DI_PD Notes Inhibit switch floating in standby/sleep mode Inhibit switch floating in sleep mode Enable input I/O supply voltage Transmission data input Transmission data enable Receive data output Bus guardian enable Standby input DO DO S AIO S AIO AIO S Receive data enable output Error diagnosis output Battery supply voltage Local wakeup input Ground Bus line Minus Bus line Plus Supply voltage PIN Types: S...................supply pad AIO...............analog I/O DI .................digital input DI_PU ..........digital input with pull-up DI_PD ..........digital input with pull-down DIO_PU........digital I/O with pull-up DIO_PD........digital I/O with pull-down DIO_T ..........digital I/O / tristate DO................digital output DO_OD ........digital output open drain Contact Headquarters: austriamicrosystems AG Business Unit Automotive T. +43 (0) 3136 500 0 F. +43 (0) 3136 5692 [email protected] For Sales Offices, Distributors and Representatives, please visit: www.austriamicrosystems.com Copyright © 2006 austriamicrosystems. Trademarks registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. To the best of its knowledge, austriamicrosystems. Code: 12643-103-00a Page 2 of 2