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Número de pieza PCA82C252T
Descripción Fault-tolerant CAN transceiver
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INTEGRATED CIRCUITS
DATA SHEET
PCA82C252
Fault-tolerant CAN transceiver
Product specification
Supersedes data of 1997 Mar 07
File under Integrated Circuits, IC18
1997 Oct 28

1 page




PCA82C252T pdf
Philips Semiconductors
Fault-tolerant CAN transceiver
Product specification
PCA82C252
FUNCTIONAL DESCRIPTION
The PCA82C252 is the interface between the CAN
protocol controller and the physical bus. It is primarily
intended for low speed applications, up to 125 kbaud, in
passenger cars. The device provides differential transmit
capability to the bus and differential receive capability to
the CAN controller.
To reduce RF interference the rise and fall slope are
limited. This allows the use of an unshielded twisted pair or
a parallel pair of wires for the bus. Moreover, it supports
transmission capability on either bus wire if one of the bus
wires is corrupted. The failure detection logic automatically
selects a suitable transmission mode.
In normal operation (no wiring failures) the differential
receiver is output to RXD. The differential receiver inputs
are connected to CANH and CANL through integrated
filters. The filtered input signals are also used for the single
wire receivers. The CANH and CANL receivers have
threshold voltages that ensure a maximum noise margin in
single-wire modes.
Failure detector
The failure detector is active in the normal operation mode
and detects the following single bus failures and switches
to an appropriate mode:
1. CANH wire interrupted
2. CANL wire interrupted
3. CANH short-circuited to battery
4. CANL short-circuited to ground
5. CANH short-circuited to ground
6. CANL short-circuited to battery
7. CANL mutually shorted to CANH.
The differential receiver threshold is set at 2.9 V.
This ensures correct reception in the normal operating
modes and, in the event of failures 1, 2 and 5 with a noise
margin as high as possible. These failures, or recovery
from them, do not destroy ongoing transmissions.
To ensure speed requirements the differential receiver has
an acceleration function.
Failures 3 and 6 are detected by comparators connected
to CANH and CANL, respectively. If the comparator
threshold is exceeded for a certain period of time, the
reception is switched to the single-wire mode. This time is
needed to avoid false triggering by external RF fields.
Recovery from these failures is detected automatically
after a certain time-out (filtering) and no transmission is
lost.
Failures 4 and 7 initially result in a permanent dominant
level at RXD. After a time-out, the CANL driver and the
RTL pin are switched off. Only a weak pull-up at RTL
remains. Reception continues by switching to the
single-wire mode via CANH. When failures 4 or 7 are
removed, the recessive bus levels are restored. If the
differential voltage remains below the recessive threshold
level for a certain period of time, reception and
transmission switch back to the differential mode.
If any of the seven wiring failures occur, the output NERR
will be made LOW. On error recovery, NERR will be made
HIGH again.
During all single-wire transmissions, the EMC
performance (both immunity and emission) is worse than
in the differential mode. Integrated receiver filters
suppress any HF noise induced into the bus wires.
The cut-off frequency of these filters is a compromise
between propagation delay and HF suppression. In the
single-wire mode, low frequency noise cannot be
distinguished from the required signal.
Low power modes
The transceiver provides 3 low power modes which can be
entered and exited via pins STB and EN.
The sleep mode is the mode with the lowest power
consumption. The INH pin is switched to high-impedance
for deactivation of external voltage regulators. CANL is
biased to the battery voltage via the RTL output. If the
supply voltage is provided the RXD and NERR will signal
the wake-up interrupt
The VBAT standby mode will react the same as the sleep
mode with an active INH output.
The VCC standby mode is the VBAT standby with RTL
switched to the VCC voltage. In this mode the NERR output
signals the VBAT power-on flag and the RXD output will
show the wake-up interrupt.
Wake-up requests are recognized by the transceiver when
a dominant signal is detected on either bus line or if the
WAKE pin is connected to ground. On a wake-up request
the transceiver will set the INH output which can be used
to activate the external VCC voltage regulator. If VCC is
provided the wake-up request can be read on the NERR or
RXD outputs, on which the external microcontroller can
wake up the transceiver (switch to normal operating mode)
via STB and EN.
1997 Oct 28
5

5 Page





PCA82C252T arduino
Philips Semiconductors
Fault-tolerant CAN transceiver
Product specification
PCA82C252
SYMBOL
PARAMETER
CONDITIONS
MIN.
tPD(H)
propagation delay TXD-to-RXD
HIGH
C1 = 100 pF; C2 = 0;
Rl = 100 ; no failures and bus
failures 1, 2 and 5
C1 = C2 = 3.3 nF; Rl = 100 ;
no failures and bus failures
1 and 2
C1 = 100 pF; C2 = 0;
R1 = 100 ;
bus failures 3, 4, 6 and 7
C1 = C2 = 3.3 nF; R1 = 100 ;
bus failures 3, 4, 5, 6 and 7
two(min)
minimum dominant time for
wake-up on CANL or CANH
low power modes VBAT = 12 V 8
tWAKE(min) minimum WAKE LOW time for low power modes VBAT = 12 V 8
wake-up
tfail failures 3 and 6 detection time normal mode
failure 3 recovery time
normal mode
10
10
failure 6 recovery time
normal mode
150
failures 4 and 7 detection time normal mode
0.75
failures 4 and 7 recovery time normal mode
10
th(min)
failures 3, 4 and 7 detection time
failures 3, 4 and 7 recovery time
minimum hold time to go to
sleep command
low power modes; VBAT = 12 V
low power modes; VBAT = 12 V
0.8
5
ec edge-count difference between normal mode
CANH and CANL for failures 1,
2 and 5 detection (NERR
becomes LOW)
edge-count difference between
CANH and CANL for failures 1,
2 and 5 recovery
normal mode
TYP. MAX.
0.75 1.25
UNIT
µs
1 1.5
µs
0.85 1.3
µs
1.4 2.1
38
38
60
60
750
4.0
60
8.0
4
50
3
µs
µs
µs
µs
µs
µs
ms
µs
ms
ms
µs
1
1997 Oct 28
11

11 Page







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