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參數(shù)資料
| 型號： | 935280277512 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | DATACOM, INTERFACE CIRCUIT, PDSO14 |
| 封裝： | 3.90 MM, PLASTIC, MS-012, SOT-108-1, SOP-14 |
| 文件頁數(shù)： | 28/30頁 |
| 文件大小： | 262K |
| 代理商： | 935280277512 |
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TJA1055_4
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 04 — 17 February 2009
7 of 26
NXP Semiconductors
TJA1055
Enhanced fault-tolerant CAN transceiver
7.2 Low power modes
The transceiver provides three low power modes which can be entered and exited via
The sleep mode is the mode with the lowest power consumption. Pin INH is switched to
HIGH-impedance for deactivation of the external voltage regulator. Pin CANL is biased to
the battery voltage via pin RTL. Pins RXD and ERR will signal the wake-up interrupt even
in case VCC is not present.
The standby mode operates in the same way as the sleep mode but with a HIGH level on
pin INH.
The power-on standby mode is the same as the standby mode, however, in this mode the
battery power-on ag is shown on pin ERR instead of the wake-up interrupt signal. The
output on pin RXD will show the wake-up interrupt. This mode is only for reading out the
power-on ag.
[1]
Wake-up interrupts are released when entering normal operating mode.
[2]
For TJA1055T a diode is added in series with the high-side driver of ERR and RXD to prevent a reverse
current from ERR to VCC in the unpowered state.
[3]
For TJA1055T/3, ERR and RXD are open-drain.
[4]
In case the goto-sleep command was used before. When VCC drops, pin EN will become LOW, but due to
the fail-safe functionality this does not effect the internal functions.
[5]
VBAT power-on ag will be reset when entering normal operating mode.
Wake-up requests are recognized by the transceiver through two possible channels:
The bus lines for remote wake-up
Pin WAKE for local wake-up
In order to wake-up the transceiver remotely through the bus lines, a lter mechanism is
integrated. This mechanism makes sure that noise and any present bus failure conditions
do not result into an erroneous wake-up. Because of this mechanism it is not sufcient to
simply pull the CANH or CANL bus lines to a dominant level for a certain time. To
guarantee a successful remote wake-up under all conditions, a message frame with a
dominant phase of at least the maximum specied tdom(CANH) or tdom(CANL) in it is required.
Table 5.
Normal operating and low power modes
Mode
Pin STB
Pin EN
Pin ERR
Pin RXD
Pin RTL
switched
to
LOW
HIGH
LOW
HIGH
Goto-sleep
command
LOW
HIGH
wake-up
interrupt
signal[1]
wake-up
interrupt
signal[1]
VBAT
Sleep
LOW
LOW[4]
Standby
LOW
Power-on
standby
HIGH
LOW
VBAT
power-on
ag[5]
wake-up
interrupt
signal[1]
VBAT
Normal
operating
HIGH
error ag
no error
ag
dominant
received
data
recessive
received
data
VCC
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