PCA82C252T Philips Semiconductors, PCA82C252T Datasheet - Page 6

• Manufacturer Part Number: PCA82C252T
• Description: Fault-tolerant CAN transceiver
• Manufacturer: Philips Semiconductors

Philips Semiconductors
To prevent false wake-up due to transients or RF fields,
wake-up voltage threshold levels have to be maintained
for a certain period of time. In the low power modes the
failure detection circuit remains partly active to prevent
increased power consumption should errors 3, 4 and 7
occur.
Power on
After power-on V
become HIGH and an internal power-on flag will be set.
This flag can be read via the NERR pin (STB = 1, EN = 0)
and will be reset by entering the normal operation mode.
The EN and STB pins will internally be set to LOW level, if
the V
provide fail safe functionality.
Table 1 Truth table of CAN transceiver
Notes
1. Wake-up interrupts are released when entering normal operating mode.
2. If go to sleep command was used before (EN may turn LOW as V
3. V
1997 Oct 28
STB EN
0
0
0
1
1
Fault-tolerant CAN transceiver
because of fail safe functionality).
CC
BAT
voltage is below a certain threshold level, to
0
0
1
0
1
power-on flag will be reset when entering normal operation mode.
V
sleep
go to sleep command
V
normal operation mode
BAT
CC
BAT
standby
standby
(2)
is switched on, the INH pin will
MODE
(3)
(1)
floating
floating
HIGH
HIGH
HIGH
INH
LOW active wake-up interrupt signal if V
LOW active V
power-on flag
LOW active error flag
NERR
6
BAT
Protections
A current limiting circuit protects the transmitter output
stages against short-circuit to positive and negative
battery voltage.
If the junction temperature exceeds a maximum value, the
transmitter output stages are disabled. Because the
transmitter is responsible for the major part of the power
dissipation, this will result in a reduced power dissipation
and hence a lower chip temperature. All other parts of the
IC will remain operating.
The CANH and CANL inputs are protected against
electrical transients which may occur in an automotive
environment.
CC
drops, without affecting internal functions
LOW active wake-up
interrupt
HIGH = receive;
LOW = dominant
received data
RXD
CC
is present switched to V
PCA82C252
Product specification
switched to V
switched to V
switched to V
switched to V
RTL
BAT
BAT
BAT
CC
CC