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| 型號(hào)： | NCV7341D20G |
| 廠商： | ON Semiconductor |
| 文件頁(yè)數(shù)： | 16/18頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | TXRX CAN 12/24V HS LP 14-SOIC |
| 標(biāo)準(zhǔn)包裝： | 55 |
| 類型： | 收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 1/1 |
| 規(guī)程： | CAN |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-SOIC |
| 包裝： | 管件 |
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NCV7341
http://onsemi.com
7
Table 3. OPERATION MODES
Conditions
Transceiver Behavior
Pin STB
Pin EN
VCC/VIO
Undervoltage
Flag
VBAT
Undervoltage
Flag
Powerup or
Wakeup Flag
Operating Mode
Pin INH
X
Set
X
Sleep
Floating
Reset
Set
Standby
High
Reset
If in sleep, then no change
Floating
otherwise standby
High
Low
Reset
Set
Standby
High
Reset
If in sleep, then no change
Floating
otherwise standby
High
Low
High
Reset
Set
Standby
High
Reset
If in sleep, then no change
Floating
otherwise gotosleep
High
Low
Reset
X
Receiveonly
High
Reset
X
Normal
High
Normal Mode
In Normal mode, the transceiver is able to communicate
via the bus lines. The CAN controller can transmit data to the
bus via TxD pin and receive data from the bus via Pin RxD.
The bus lines (CANH and CANL) are internally biased to
VCC/2 via the commonmode input resistance. Pin VSPLIT
is also providing voltage VCC/2 which can be further used
to externally stabilize the common mode voltage of the bus
– see Figure 2 and Figure 3. Pin INH is active (pulled high)
so that the external regulators controlled by INH Pin are
switched on.
ReceiveOnly Mode
In Receiveonly mode, the CAN transmitter is disabled.
The CAN controller can still receive data from the bus via
RxD Pin as the receiver part remains active. Equally to
normal mode, the bus lines (CANH and CANL) are
internally biased to VCC/2 and Pin VSPLIT is providing
voltage VCC/2. Pin INH is also active (pulled high).
Standby Mode
Standby mode is a lowpower mode. Both the transmitter
and the receiver are disabled and a very lowpower
differential receiver monitors the CAN bus activity. Bus
lines are biased internally to ground via the common mode
input resistance and Pin VSPLIT is highimpedant (floating).
A wakeup event can be detected either on the CAN bus or
on the WAKE Pin. A valid wakeup is signaled on pins ERR
and RxD. Pin INH remains active (pulled high) so that the
external regulators controlled by INH Pin are switched on.
GoToSleep Mode
GoToSleep mode is an intermediate state used to put the
transceiver into sleep mode in a controlled way.
GoToSleep mode is entered when the CAN controller
puts pin EN to High and STB Pin to Low. If the logical state
of Pins EN and STB is kept unchanged for minimum period
of th(min) and neither a wakeup nor a powerup event occur
during this time, the transceiver enters sleep mode. While in
gotosleep mode, the transceiver behaves identically to
standby mode.
Sleep Mode
Sleep mode is a lowpower mode in which the
consumption is further reduced compared to standby
mode. Sleep mode can be entered via gotosleep mode or
in case an undervoltage on either VCC or VIO occurs for
longer than the undervoltage detection time. The
transceiver behaves identically to standby mode, but the
INH Pin is deactivated (left floating) and the external
regulators controlled by INH Pin are switched off. In this
way, the VBAT consumption is reduced to a minimum. The
device will leave sleep mode either by a wakeup event (in
case of a CAN bus wakeup or via Pin WAKE) or by putting
Pin STB high (as long as an undervoltage on VCC or VIO
is not detected).
Internal Flags
The transceiver keeps several internal flags reflecting
conditions and events encountered during its operation.
Some flags influence the operation mode of the transceiver
TxD dominant timeout flags, all others can be read by the
CAN controller on Pin ERR. Pin ERR signals internal flags
depending on the operation mode of the transceiver. An
overview of the flags and their visibility on Pin ERR is given
in Table 4. Because the ERR Pin uses negative logic, it will
be pulled low if the signaled flag is set and will be pulled
high if the signaled flag is reset.
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