code: 12643-103-00a page 1 of 2 AS8221 high performance bus transceiver product brief 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. package: lead-free ssop20 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 real- time applications in the stringent automotive environment. an extended diagnostic interface, offers advanced bus- failure 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. 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 key features - 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 a) - 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 -40c to +125c - 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
code: 12643-103-00a page 2 of 2 AS8221 high performance bus transceiver product brief pin pin name pin type notes 1 inh2 aio inhibit switch floating in standby/sleep mode 2 inh1 aio inhibit switch floating in sleep mode 3 en di_pd enable input 4 vio s i/o supply voltage 5 txd di_pd transmission data input 6 txen di_pu transmission data enable 7 rxd do receive data output 8 bge di_pd bus guardian enable 9 stbn di_pd standby input 10 not used 11 not used 12 rxen do receive data enable output 13 errn do error diagnosis output 14 vbat s battery supply voltage 15 wake aio local wakeup input 16 gnd s ground 17 bm aio bus line minus 18 bp aio bus line plus 19 vcc s supply voltage 20 not used contact headquarters: austriamicrosystems ag business unit automotive t. +43 (0) 3136 500 0 f. +43 (0) 3136 5692 info@austriamicrosystems.com 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. pin descri p tion 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
|
