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PDF AU5783 Data sheet ( Hoja de datos )
| Número de pieza | AU5783 | |
| Descripción | J1850/VPW transceiver with supply control function | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AU5783 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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INTEGRATED CIRCUITS
AU5783
J1850/VPW transceiver with
supply control function
Objective specification
1999 May 11
Philips
Semiconductors
1 page  
Philips Semiconductors
J1850/VPW transceiver with supply control function
Objective specification
AU5783
essentially disconnecting an electronic control unit from the J1850
bus line. The TX signal is internally looped back to the RX output.
The AU5783 features special robustness at its BAT and BUS pins
hence the device is well protected for applications in the automotive
environment. Specifically the BAT input is protected against 40V
load dump and jump start condition. The BUS output is protected
against wiring fault conditions e.g. short circuit to ground and battery
voltage as well as typical automotive transients and electrostatic
discharge. In addition, an over-temperature shutdown function with
hysteresis is incorporated which protects the device under network
fault conditions. In case of the die temperature reaching the trip
point, the AU5783 will latch-off the transceiver function. The device
is reset on the first rising edge on the TX input after a decrease in
the junction temperature.
Table 1. Control input summary
Z = Input connected to high impedance permitting it to float. Typically accomplished by turning off the output of a microcontroller.
X = Don’t care; The input may be at either logic level.
NSTB 4X/LOOP
TX
Mode
Bus
transmitter
BUS
RX (out)
INH
1 0 1 normal operation
active
high
low
high
1 0 0 normal operation
passive
float
bus state,
Note 2
high
1 1 1 4X transmit
active
high
low
high
1 1 0 4X transmit
passive
float
bus state,
Note 2
high
1 Z 1 loop-back
passive
float
low
high
1 Z 0 loop-back
passive
float
high
high
0 or Z
X
X standby (default state after power on), off
Note 1
float bus state, high
Note 5
1 –> 0
X
X go to sleep command, Note 4
off
float bus state, float, Note 3
Note 5
0 or Z
X
X sleep, Note 4
off float bus state, float
Note 5
NOTES:
1. After power-on, the AU5783 enters standby mode since the input pins NSTB and 4X/LOOP are assumed to be floating. In standby mode the
voltage regulator is enabled via the INH output, and therefore power is supplied to the microcontroller. When the microcontroller begins
operation it will normally set the control inputs NSTB high and 4X/LOOP to low state in order to start normal operation of the AU5783.
2. RX outputs the bus state. If the bus level is below the receiver threshold (i.e., all transmitters passive), then RX will be high. Otherwise, if the
bus level is above the receiver threshold (i.e., at least one transmitter is active), then RX will be low.
3. INH is turned off after a time-out period.
4. For entering the sleep mode (e.g., to deactivate INH), the “Go To Sleep” command needs to be applied. The “Go To Sleep” command is a
high-to-low transition on the NSTB input. When the “Go To Sleep” command is present, the INH flag is deactivated. This signal can be used
to turn-off the voltage regulator of an electronic module. After the voltage regulator is turned off the microcontroller is no longer supplied and
the NSTB input will be floating. The INH output will be set again upon detection of bus activity or occurrence of a local wake-up event.
5. In standby and sleep mode, the detection of a wake-up condition (e.g., high level on BUS) will be signalled on the output RX.
1999 May 11
5
5 Page 
Philips Semiconductors
J1850/VPW transceiver with supply control function
APPLICATION INFORMATION
Objective specification
AU5783
µC with J1850 Link Controller
VPWO VPWI port port
VCC
3.9 k
+5V
Rb
1k
Ra
10 k
100 nF
TX RX NSTB 4X/LOOP INH
LWAKE
AU5783
Transceiver
LOAD
BUS
BAT
GND
R/F
10.7 k
1%
Rld
47 uH
56 k
Rs
1%
5V
Reg.
+12V
SAE/J1850/VPW BUS LINE
470 pF
SL01227
NOTES:
11. Value of Rld depends, e.g., on type of bus node. Example: secondary node Rld =10.7k, primary node Rld =1.5k.
12. For connection of the NSTB and 4X/LOOP pins there are different options, e.g., connect to a port pin or to VCC or to active low reset.
Figure 4. Application of the AU5783 transceiver
1999 May 11
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AU5783.PDF ] | |
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