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PDF AS8221 Data sheet ( Hoja de datos )
| Número de pieza | AS8221 | |
| Descripción | FlexRay Standard Transceiver | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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Data Sheet
AS8221
FlexRay Standard Transceiver
www.DataSheet4U.com
1 General Description
This document is subjected to change without notice.
The AS8221 is a high speed automotive bus driver fully conforming
to the FlexRay Electrical Physical Layer Specification V2.1 Rev B.
The AS8221 operates as a bi-directional interface between the
FlexRay Communication Controller and the twisted-pair copper
wiring.
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-0NLY 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 bus-
guardian 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
Compliant with FlexRay Electrical Physical Layer Specification
V2.1 Rev. B
Data transfer up to 10 Mbps
Excellent EMC performance. High common mode range ensure
excellent EMI
Interface for Bus Guardian or supervision circuits
Automatic thermal shutdown protection
Supports 12V and 24V systems with very low sleep current
Integrated 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
Supports 2.5, 3, 3.3, 5 V microcontrollers, automatic adaptation
to digital interface levels
Protection against damage due to short circuit conditions on the
bus (positive and negative battery voltage)
Operating temperature range -40ºC to +125ºC
Lead-free 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 30). The AS8221 can be used as only ECU wake-up
component with very low power consumption in SLEEP mode.
www.austriamicrosystems.com/flexray/AS8221
Revision 1.1
1 - 43
1 page  
AS8221
Data Sheet - Pin Assignments
4 Pin Assignments
Figure 2. Pin Assignments SSOP20 Package
INH2
INH1
EN
VIO
TxD
TxEN
RxD
BGE
STBN
Reserved
1
2
3
4
5
6
7
8
9
10
20 n.u
19 VCC
18 BP
17 BM
AS8221 16 GND
15 WAKE
14 VBAT
13 ERRN
12 RxEN
11 n.u
www.DataSheet4U.com
4.1 Pin Descriptions
Table 1. Pin Descriptions
Pin Name
INH2
INH1
EN
VIO
TxD
TxEN
RxD
BGE
STBN
Pin Number
1
2
3
4
5
6
7
8
9
Reserved
10
Not used
RxEN
ERRN
VBAT
WAKE
GND
BM
BP
VCC
Not used
11
12
13
14
15
16
17
18
19
20
Pin Type
AIO
AIO
DI_PD
S
DI_PD
DI_PU
DO
DI_PD
DI_PD
A/DIO_PD
DO
DO
S
AIO
S
AIO
AIO
S
1. To be connected to GND or to be unconnected
Description
Analog Output. Inhibit 2 output for switching external voltage regulator
Analog Output. Inhibit 1 output for switching external voltage regulator
Digital Input. Enable input
Supply Voltage. I/O supply voltage
Digital Input. Transmit data input
Digital Input. Transmitter enable input
Digital Output. Receive data output
Digital Input. Bus guardian enable input
Digital Input. Standby input
1
Digital Output. Receive data enable output
Digital Output. Error diagnosis output and wake status output
Supply Voltage. Battery supply voltage
Analog Input. Local wake-up input
Ground
Analog Input/Output. Bus line Minus
Analog Input/Output. Bus line Plus
Supply voltage.
www.austriamicrosystems.com/flexray/AS8221
Revision 1.1
5 - 43
5 Page 
AS8221
Data Sheet - Electrical Characteristics
www.DataSheet4U.com
Table 3. Electrical Characteristics
Symbol
Parameter
tRxD_RISE
Rise time RxD voltage
tBUSIdleDetection
tBUSActivityDetection
tBUSIdleReaction
tBUSActivityReaction
Wake-Up Detector
tBWU_D0
tBWU_Idle
tBWU_Detect
VBWUTH
VLWUTH
Idle detection time
Activity detection time
Idle reaction time
Activity reaction time
Data0 detection time in remote
wake-up pattern
Idle or Data1 detection time in
remote wake-up pattern
Total remote wake-up detection
time
Bus wake-up detection threshold
Local wake-up detection
threshold
ILWUL
Low level input current on local
WAKE pin
ILWUH
High level input current on local
WAKE pin
tLWUFilter
Supply Voltage Monitor
Local wake filter time
VBATTHH
VBAT undervoltage recovery
threshold
VBATTHL
VBAT undervoltage detection
threshold
VCCTHH
VCC under-voltage recovery
threshold
VCCTHL
VCC undervoltage detection
threshold
VIOTHH
VIO undervoltage recovery
threshold
VIOTHL
VIO undervoltage detection
threshold
tUV_DETECT
Detection time for undervoltage
at VBAT, VCC, VIO
tUV_REC
Bus Error Detection
Detection time for undervoltage
recovery at VBAT, VCC, VIO
ITHL
Absolute bus current for low
current detection
ITHH
Absolute bus current for high
current detection
Conditions
20% - 80% of VRxD;
CRxD=15 pF
(see footnote 3)
VBUS: 400mV → 0V
VBUS: 0V → 400mV
VBUS: 400mV → 0V
VBUS: 0V → 400mV
-10V < (VBP, VBM) < 15V
-10V < (VBP, VBM) < 15V
-10V < (VBP, VBM) < 15V
-10V < (VBP, VBM) < 15V
VBAT = 12V; VLWAKE = 2V for
t < tLWUFilter
VBAT = 12V; VLWAKE = 4V for
t < tLWUFilter
NORMAL mode, Transmitter
enabled
NORMAL mode, Transmitter
enabled
Min Typ Max Units
2 5 ns
50 173 200
100 173 250
50 192 300
100 200 350
ns
ns
ns
ns
124
124
48 73 140
-300 -250 -150
2 2.8 4
-20 -10
-5
5 11 20
1 20 40
µs
µs
µs
mV
V
µA
µA
µs
3.5 4 4.5
2.5 3 3.5
3.5 4 4.5
2.5 3 3.5
1.25 1.6
2.0
0.75 1.1
1.5
100 300 700
0.7 2
5
V
V
V
V
V
V
ms
ms
5 mA
40 mA
www.austriamicrosystems.com/flexray/AS8221
Revision 1.1
11 - 43
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS8221.PDF ] | |
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