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PDF AS8222 Data sheet ( Hoja de datos )
| Número de pieza | AS8222 | |
| Descripción | Enhanced FlexRay Standard Transceiver | |
| Fabricantes | ams | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS8222 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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AS8222
Enhanced FlexRay Standard Transceiver
1 General Description
The AS8222 is a high-speed fault tolerant device operating as
interface between a generic FlexRay Communication Controller and
the copper wiring.
This device is the first FlexRay certified Transceiver for temperature
ranges up to 150°C ambient temperature. For bare-die deliveries
please contact ams for more information.
The AS8222 is designed to extend the application range for high
speed and safety critical time triggered bus systems in an
automotive environment. The bus driver is protected against short
circuits to the supply and GND. The AS8222 operates at baudrates
up to 10 Mbps and is fully conforming to the FlexRay Electrical
Physical Layer Specification V2.1 Rev B.
The AS8222 provides a host controller interface consisting of Enable
(EN) and Standby (STBN) input pins for mode handling by the
microcontroller and the Error (ERRN) output pin, signalling failures
and status information.
The device supports the NORMAL mode with activated FlexRay bus
transmitter and receiver, the RECEIVE_ONLY mode with activated
receiver only to avoid unwanted disturbances while listening to the
communication and the low-power modes STANDBY and SLEEP
with very low power consumption.
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.
Ensuring application in safety critical environments a two wire bus-
guardian interface is implemented where additional redundant
circuitries on the electronic-control-unit can monitor the
communication on the receive enable output (RxEN) and can
activate and deactivate through the bus guardian enable input (BGE)
the transmitter. Additionally in low-power modes the wake conditions
at the RxEN pin can be monitored.
A thermal sensor circuit with an integral shutdown mechanism
prevents damage to the device in extreme temperature conditions.
2 Key Features
Data transfer up to 10 Mbps
Compliant with FlexRay Electrical Physical Layer Specification
V2.1 Rev. B
Wide operating ambient temperature range -40°C to +150°C
Excellent EMC performance
High common mode range insures excellent EMI immunity
Interface with optional bus guardian for bus supervision
Automatic thermal shutdown protection
Supports 12, 24V systems with low sleep current consumption
Integrated power management system
Two INH pins for the external voltage regulators control
Local wake-up input
Remote wake-up capability via FlexRay bus in sleep mode
Supports 2.5, 3, 3.3, 5 V microcontrollers and automatically
adapts to interface levels
Does not disturb the bus line if not powered
Protected against damage due to short circuit conditions on the
bus (positive and negative battery voltage)
Small Pb-free package: SSOP-20
Automotive qualified to AEC-Q100, grade 0
For bare-die deliveries please contact us.
3 Applications
The AS8222 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 (terminal 30).
The device is best suited for high temperature applications with up to
150°C.
www.ams.com/eng/FlexRay/AS8222
Revision 1.0
1 - 42
1 page  
AS8222
Datasheet - Pin Assignments
4 Pin Assignments
The AS8222 is available in SSOP-20 5.3mm.
Figure 2. Pin Assignments (Top View)
INH2 1
INH1 2
EN 3
VIO 4
TxD 5
TxEN 6
RxD 7
BGE 8
STBN 9
- 10
AS8222
(SSOP20)
20 -
19 VCC
18 BP
17 BM
16 GND
15 WAKE
14 VBAT
13 ERRN
12 RxEN
11 -
4.1 Pin Descriptions
Table 1. SSOP-20 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
Analog I/O
Digital Input with Pull-down
Supply
Digital Input with Pull-down
Digital Input with Pull-up
Digital Output
Digital Input with Pull-down
Analog/digital Input/output
with Pull-down
-
Digital Output
Supply
Analog I/O
Supply
Analog I/O
Supply
-
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
To be connected to GND or to be unconnected
-
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.ams.com/eng/FlexRay/AS8222
Revision 1.0
5 - 42
5 Page 
AS8222
Datasheet - Electrical Characteristics
Table 5. Transmitter
Symbol
tTXEN_BUS_Active_Idle
Parameter
Delay time from TxEN to bus idle
Conditions
RL=45 Ω; CL= 100 pF
dBDTxai
Propagation delay active → idle
tTXEN_MISMATCH Delay time from TxEN to BUS mismatch
dBDTxDM
| dBDTxia - dBDTxai |
| tTXEN_BUS_Idle_Active -
tTXEN_BUS_Active_Idle |;
RL=45 Ω; CL= 100 pF
tBGE_BUS_IdleActive Delay time from BGE to bus active
dBDTxia
tBGE_BUS_Active_Idle
Propagation delay idle → active
Delay time from BGE to bus idle
dBDTxai
tBUS_Idle_Active
Propagation delay active → idle
Differential bus voltage transition time:
idle to active
RL=45 Ω; CL= 100 pF
dBusTxia
tBUS_Active_Idle
Transition time idle → active
Differential bus voltage transition time:
active to idle
RL=45 Ω; CL= 100 pF
dBusTxai
tTxEN_timeout
Transition time active → idle
TxEN timeout
6.4 Receiver
The following parameters are applicable to all the branch receivers.
Table 6. Receiver
Symbol
Parameter
Conditions
RBP, RBM
RCM1, RCM2
BP, BM input resistance
Receiver common mode input
resistance
Idle mode; RBUS= ∞
RDIFF
BP, BM differential input resistance
Idle mode; RBUS= ∞
VBP, VBM
Common mode voltage range
Min Typ Max Units
18 50 ns
100 ns
0 50 ns
50 ns
18 50 ns
100 ns
18 50 ns
100 ns
5 30 ns
30 ns
2 30 ns
30 ns
3 5 10 ms
Min Typ Max Units
10 25 40 kΩ
10 40 kΩ
20 50 80 kΩ
-10 +15 V
uCM
VBPidle, VBMidle
uBias
Common mode voltage range (with
respect to GND) that does not disturb
the receive function
Idle voltage in non-low-power modes
on pin BP, BM
Bus bias voltage during BD_Normal
mode
Non-low-power modes; VTXEN=VIO
40 Ω < RL < 55 Ω
-10
0.4*VCC
1800
+15
0.5*VCC 0.6*VCC
3200
V
V
mV
www.ams.com/eng/FlexRay/AS8222
Revision 1.0
11 - 42
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS8222.PDF ] | |
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