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參數(shù)資料
| 型號： | TJA1053T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | Fault-tolerant CAN transceiver |
| 中文描述： | DATACOM, INTERFACE CIRCUIT, PDSO14 |
| 封裝： | PLASTIC, SO-14 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大小： | 113K |
| 代理商： | TJA1053T |
1997 Oct 15
6
Philips Semiconductors
Preliminary specification
Fault-tolerant CAN transceiver
TJA1053
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 V
CC
voltage regulator. If V
CC
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.
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
BAT
is switched on, the INH pin will
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
CC
voltage is below a certain threshold level, to
provide fail safe functionality.
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.
Table 1
Truth table of CAN transceiver
Notes
1.
2.
Wake-up interrupts are released when entering normal operating mode.
If go to sleep command was used before (EN may turn LOW as V
CC
drops, without affecting internal functions
because of fail safe functionality).
V
BAT
power-on flag will be reset when entering normal operation mode.
3.
STB
EN
MODE
INH
NERR
RXD
RTL
0
0
0
1
0
0
1
0
V
BAT
standby
(1)
sleep
(2)
go to sleep command
V
CC
standby
(3)
HIGH
floating
floating
HIGH
active LOW wake-up interrupt signal if V
CC
is present switched to V
BAT
switched to V
BAT
switched to V
BAT
switched to V
CC
active LOW V
BAT
power-on flag
active LOW error flag
active LOW wake-up
interrupt
HIGH = receive;
LOW = dominant
received data
1
1
normal operation mode
HIGH
switched to V
CC
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