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參數(shù)資料
| 型號： | 935261511005 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | DATACOM, INTERFACE CIRCUIT, UUC15 |
| 封裝： | DIE-15 |
| 文件頁數(shù)： | 27/28頁 |
| 文件大?。?/td> | 281K |
| 代理商： | 935261511005 |
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TJA1054_4
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 04 — 24 September 2009
8 of 25
NXP Semiconductors
TJA1054
Fault-tolerant CAN transceiver
A local wake-up through pin WAKE is detected by a rising or falling edge with a
consecutive level exceeding the maximum specied tWAKE.
On a wake-up request the transceiver will set the output on pin INH to HIGH which can be
used to activate the external supply voltage regulator.
If VCC is provided the wake-up request can be read on the ERR or RXD outputs, so the
external microcontroller can activate the transceiver (switch to normal operating mode) via
pins STB and EN.
To prevent a false remote wake-up due to transients or RF elds, the wake-up voltage
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 an increased power consumption
in the event of failures 3, 3a, 4 and 7.
To prevent a false local wake-up during an open wire at pin WAKE, this pin has a weak
pull-up current source towards VBAT. However, in order to prevent EMC issues, it is
recommended to connect a not used pin WAKE to pin BAT. INH is set to oating only if
the goto-sleep command is entered successfully. To enter a successful goto-sleep
command under all conditions, this command must be kept stable for the maximum
specied th(sleep).
Pin INH will be set to a HIGH level again by the following events only:
VBAT power-on (cold start)
Rising or falling edge on pin WAKE
A message frame with a dominant phase of at least the maximum specied t(CANH) or
t(CANL), while pin EN or pin STB is at a LOW level
Pin STB goes to a HIGH level with VCC active
To provide fail-safe functionality, the signals on pins STB and EN will internally be set to
LOW when VCC is below a certain threshold voltage (VCC(stb)).
7.3 Power-on
After power-on (VBAT switched on) the signal on pin INH will become HIGH and an internal
power-on ag will be set. This ag can be read in the power-on standby mode through
pin ERR (STB = 1; EN = 0) and will be reset by entering the normal operating mode.
7.4 Protections
A current limiting circuit protects the transmitter output stages against short-circuit to
positive and negative battery voltage.
If the junction temperature exceeds the typical value of 165
°C, 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 device will continue to operate.
The pins CANH and CANL are protected against electrical transients which may occur in
an automotive environment.
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