AS8221-ASSP

AS8221-ASSP Datasheet

AS8221

Part	Datasheet
AS8221-ASSP	AS8221-ASSP (pdf)

Related Parts	Information
AS8221-ASSM	AS8221-ASSM

PDF Datasheet Preview
AS8221 FlexRay Standard Transceiver 1 General Description This document is subject to change without notice. The AS8221 provides an optimized host controller interface consisting of three low-active pins. The Enable EN and Standby STBN input pins for mode handling by the microcontroller and the Error ERRN out pin where system, chip failures or status information are signalled to the microcontroller. Signalling logic high on the Enable and Standby pin the device will enter NORMAL mode in case no fault condition is given and in this mode the device is fully operational meaning FlexRay communication is possible. Additionally, a RECEIVE-ONLY mode is implemented, which can be accessed by the microcontroller where only FlexRay streams can be received in order to avoid unwanted disturbances on the FlexRay bus while listening to the bus traffic. In the low-power modes STANDBY and SLEEP mode very low power consumption is achieved. In case of undervoltage at one of the supply voltages VBAT, VCC, and VIO the device will change its mode to a low-power mode either STANDBY or SLEEP mode and the device will signal an error accordingly. In case of low voltage is detected on both VBAT and VCC the device will enter the POWER-OFF mode, where no operation is possible. A safe mechanism from the low-power modes to POWER-OFF mode and vice versa is implemented ensuring that no deadlock can happen during the startup phase. Ensuring application in safety critical environments a two wire busguardian interface is implemented where additional monitoring circuitries on the electronic-control-unit can activate and deactivate the transmitter and additionally on the receive enable output RxEN in low-power modes the wake conditions and in normal power modes the received FlexRay streams can be monitored. 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 BM and bus-plus BP line allows an ideal balance of communications over different network topologies, with excellent EMC performance. 2 Key Features transfer up to 10 Mbps EMC performance. High common mode range ensure excellent EMI for Bus Guardian or supervision circuits thermal shutdown protection 12V and 24V systems with very low sleep current power management system - Two inhibit pins for external voltage supply control - Local wake-up input - Remote wake-up capability via FlexRay bus in low-power modes 2.5V, 3V, 3.3V, 5V microcontrollers, automatic adaptation to digital interface levels against damage due to short circuit conditions on the bus positive and negative battery voltage temperature range -40ºC to +125ºC SSOP20 package 3 Applications The AS8221 FlexRay Standard Transceiver is best fitting for automotive FlexRay nodes where bus wake-up and voltage regulator control for voltage supplies is needed. The device addresses all ECUs connected to the permanent battery supply clamp The AS8221 can be used as only ECU wake-up component with very low power consumption in SLEEP mode. 1 - 42 AS8221 Datasheet - Applications Figure AS8221 FlexRay Standard Transceiver Block Diagram STBN EN ERRN AS8221 Host Controller Interface Bus Failure Detector RxD TxD TxEN Communication Controller Internal Logic IL Transmitter Interface BGE RxEN INH1 INH2 Bus Activity and Idle Detection only in NORMAL and RECEIVE-ONLY mode 28 Bus Data Detection only in NORMAL and RECEIVE-ONLY 28 Receiver Test 29 Test Circuits 30 Application Circuits 31 10 32 FlexRay Functional Classes 32 FlexRay Parameter Comparison 32 11 Package Drawings and 39 12 Ordering 41 4 - 42 AS8221 Datasheet - Pin Assignments 4 Pin Assignments Figure Pin Assignments SSOP20 Package INH2 INH1 TxEN STBN Reserved AS8221 WAKE VBAT ERRN RxEN Pin Descriptions Table Pin Descriptions Pin Name Pin Number INH2 INH1 TxEN STBN Reserved Not used RxEN ERRN VBAT WAKE Not used Pin Type Analog I/O Analog Output. Inhibit 2 output for switching external voltage regulator Analog Output. Inhibit 1 output for switching external voltage regulator Digital input with pull-down Digital Input. Enable input Supply pad Supply Voltage. I/O supply voltage Digital input with pull-down Digital Input. Transmit data input Digital input with pull-up Digital Input. Transmitter enable input Digital output Digital Output. Receive data output First version Made sentence corrections and converted the ‘Typ’ values of Table 3 in to standard format. No Technical Changes to the datasheet. Updated the ERRN Signalling Table no functional change Updated Ordering Information Table Added Package Drawings and Markings refer to page Updated Ordering Information Table Updated the following VBAT minimum voltage requirement in Electrical Characteristics, Error Flags, Error and Status Flag Bit Order. Updated Absolute Maximum Ratings on page 6, Package Drawings and Markings on page Updated package body temperature under Absolute Maximum Ratings. Figure 12, Figure 13, Figure 14, Figure 15, Figure 16 updated. Added Application Circuits. Updated ESD parameter in Absolute Maximum Ratings on page Updated Package Drawings and Markings section. Updated Ordering Information. 40 - 42 AS8221 Datasheet - Ordering Information 12 Ordering Information The devices are available as the standard products shown in Table Table Ordering Information Ordering Code Marking AS8221-ASSP AS8221-ASSM AS8221 AS8221 FlexRay Standard Transceiver Delivery Form Tape & Reel in Dry Pack 1 reel = 2000 units Tape & Reel in Dry Pack 1 reel = 500 units Package SSOP-20 SSOP-20 Note All products are RoHS compliant and ams green. Buy our products or get free samples online at Technical Support is available at For further information and requests, email us at or find your local distributor at 41 - 42 AS8221 Datasheet - Copyrights Copyrights Copyright 1997-2013, ams AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. 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. All products and companies mentioned are trademarks or registered trademarks of their respective companies. Disclaimer Devices sold by ams AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. ams AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. ams AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with ams AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by ams AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. The information furnished here by ams AG is believed to be correct and accurate. However, ams AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of ams AG rendering of technical or other services. Contact Information Headquarters ams AG Tobelbaderstrasse 30 A-8141 Unterpremstaetten, Austria Tel +43 0 3136 500 0 Fax +43 0 3136 525 01 For Sales Offices, Distributors and Representatives, please visit: 42 - 42

PDF Datasheet Preview

AS8221

FlexRay Standard Transceiver
1 General Description

This document is subject to change without notice.

The AS8221 provides an optimized host controller interface consisting of three low-active pins. The Enable EN and Standby STBN input pins for mode handling by the microcontroller and the Error ERRN out pin where system, chip failures or status information are signalled to the microcontroller. Signalling logic high on the Enable and Standby pin the device will enter NORMAL mode in case no fault condition is given and in this mode the device is fully operational meaning FlexRay communication is possible. Additionally, a RECEIVE-ONLY mode is implemented, which can be accessed by the microcontroller where only FlexRay streams can be received in order to avoid unwanted disturbances on the FlexRay bus while listening to the bus traffic. In the low-power modes STANDBY and SLEEP mode very low power consumption is achieved.

In case of undervoltage at one of the supply voltages VBAT, VCC, and VIO the device will change its mode to a low-power mode either STANDBY or SLEEP mode and the device will signal an error accordingly. In case of low voltage is detected on both VBAT and VCC the device will enter the POWER-OFF mode, where no operation is possible. A safe mechanism from the low-power modes to POWER-OFF mode and vice versa is implemented ensuring that no deadlock can happen during the startup phase.

Ensuring application in safety critical environments a two wire busguardian interface is implemented where additional monitoring circuitries on the electronic-control-unit can activate and deactivate the transmitter and additionally on the receive enable output RxEN in low-power modes the wake conditions and in normal power modes the received FlexRay streams can be monitored.

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 BM and bus-plus BP line allows an ideal balance of communications over different network topologies, with excellent EMC performance.
2 Key Features
transfer up to 10 Mbps

EMC performance. High common mode range ensure excellent EMI
for Bus Guardian or supervision circuits
thermal shutdown protection
12V and 24V systems with very low sleep current
power management system
- Two inhibit pins for external voltage supply control - Local wake-up input - Remote wake-up capability via FlexRay bus in low-power
modes 2.5V, 3V, 3.3V, 5V microcontrollers, automatic
adaptation to digital interface levels
against damage due to short circuit conditions on the bus positive and negative battery voltage
temperature range -40ºC to +125ºC

SSOP20 package
3 Applications

The AS8221 FlexRay Standard Transceiver is best fitting for automotive FlexRay nodes where bus wake-up and voltage regulator control for voltage supplies is needed.

The device addresses all ECUs connected to the permanent battery supply clamp The AS8221 can be used as only ECU wake-up component with very low power consumption in SLEEP mode.
1 - 42

AS8221

Datasheet - Applications

Figure AS8221 FlexRay Standard Transceiver Block Diagram

STBN EN

ERRN

AS8221

Host Controller Interface

Bus Failure Detector

RxD TxD TxEN

Communication

Controller

Internal Logic IL

Transmitter

Interface

BGE RxEN

INH1 INH2
Bus Activity and Idle Detection only in NORMAL and RECEIVE-ONLY mode 28 Bus Data Detection only in NORMAL and RECEIVE-ONLY 28 Receiver Test 29 Test Circuits 30 Application Circuits 31 10 32 FlexRay Functional Classes 32 FlexRay Parameter Comparison 32 11 Package Drawings and 39 12 Ordering 41
4 - 42

AS8221

Datasheet - Pin Assignments
4 Pin Assignments

Figure Pin Assignments SSOP20 Package

INH2

INH1

TxEN

STBN

Reserved

AS8221

WAKE

VBAT

ERRN

RxEN

Pin Descriptions

Table Pin Descriptions

Pin Name

Pin Number

INH2

INH1

TxEN

STBN

Reserved

Not used

RxEN

ERRN

VBAT

WAKE

Not used

Pin Type

Analog I/O

Analog Output. Inhibit 2 output for switching external voltage regulator Analog Output. Inhibit 1 output for switching external voltage regulator

Digital input with pull-down Digital Input. Enable input

Supply pad

Supply Voltage. I/O supply voltage

Digital input with pull-down Digital Input. Transmit data input

Digital input with pull-up Digital Input. Transmitter enable input

Digital output

Digital Output. Receive data output
First version Made sentence corrections and converted the ‘Typ’ values of Table 3 in to standard format. No Technical Changes to the datasheet. Updated the ERRN Signalling Table no functional change Updated Ordering Information Table Added Package Drawings and Markings refer to page
Updated Ordering Information Table

Updated the following VBAT minimum voltage requirement in Electrical Characteristics, Error Flags, Error and Status Flag Bit Order. Updated Absolute Maximum Ratings on page 6, Package Drawings and Markings on page

Updated package body temperature under Absolute Maximum Ratings.

Figure 12, Figure 13, Figure 14, Figure 15, Figure 16 updated. Added Application Circuits.

Updated ESD parameter in Absolute Maximum Ratings on page

Updated Package Drawings and Markings section.
Updated Ordering Information.
40 - 42

AS8221
Datasheet - Ordering Information
12 Ordering Information

The devices are available as the standard products shown in Table
Table Ordering Information
Ordering Code

Marking

AS8221-ASSP AS8221-ASSM

AS8221

AS8221 FlexRay Standard Transceiver

Delivery Form Tape & Reel in Dry Pack
1 reel = 2000 units Tape & Reel in Dry Pack
1 reel = 500 units

Package SSOP-20 SSOP-20

Note All products are RoHS compliant and ams green. Buy our products or get free samples online at

Technical Support is available at

For further information and requests, email us at or find your local distributor at
41 - 42

AS8221

Datasheet - Copyrights

Copyrights

Copyright 1997-2013, ams AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. 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. All products and companies mentioned are trademarks or registered trademarks of their respective companies.

Disclaimer

Devices sold by ams AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. ams AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. ams AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with ams AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by ams AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. The information furnished here by ams AG is believed to be correct and accurate. However, ams AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of ams AG rendering of technical or other services.

Contact Information

Headquarters ams AG Tobelbaderstrasse 30 A-8141 Unterpremstaetten, Austria Tel +43 0 3136 500 0 Fax +43 0 3136 525 01

For Sales Offices, Distributors and Representatives, please visit:
42 - 42

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived AS8221-ASSP Datasheet file may be downloaded here without warranties.

Datasheet ID: AS8221-ASSP 519771