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參數(shù)資料
| 型號(hào)： | NCV7340D14R2G |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX CAN HS LP 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 系列： | * |
NCV7340
http://onsemi.com
4
FUNCTIONAL DESCRIPTION
Operating Modes
NCV7340 provides two modes of operation as illustrated
in Table 3. These modes are selectable through pin STB.
Table 3. OPERATING MODES
Pin
STB
Mode
Pin RXD
Low
High
Low
Normal
Bus dominant
Bus recessive
High
Standby
Wakeup request
detected
No wakeup
request detected
Normal Mode
In the normal mode, the transceiver is able to
communicate via the bus lines. The signals are transmitted
and received to the CAN controller via the pins TxD and
RxD. The slopes on the bus lines outputs are optimized to
give extremely low EME.
Standby Mode
In standby mode both the transmitter and receiver are
disabled and a very lowpower differential receiver
monitors the bus lines for CAN bus activity. The bus lines
are terminated to ground and supply current is reduced to a
minimum, typically 10
mA. When a wakeup request is
detected by the lowpower differential receiver, the signal
is first filtered and then verified as a valid wake signal after
a time period of tdwakerd, the RxD pin is driven low by the
transceiver to inform the controller of the wakeup request.
Split Circuit
The VSPLIT pin is operational only in normal mode. In
standby mode this pin is floating. The VSPLIT can be
connected as shown in Figure 2 or, if it’s not used, can be left
floating. Its purpose is to provide a stabilized DC voltage of
0.5 x VCC to the bus avoiding possible steps in the
commonmode signal therefore reducing EME. These
unwanted steps could be caused by an unpowered node on
the network with excessive leakage current from the bus that
shifts the recessive voltage from its nominal 0.5 x VCC
voltage.
Wakeup
When a valid wakeup (dominant state longer than tWake)
is received during the standby mode the RxD pin is driven
low. The wakeup detection is not latched: RxD returns to
High state after twakedr when the bus signal is released back
to recessive – see Figure 4. Wakeup behavior in case of a
permanent dominant due to, for example, a bus short
represents the only difference between the circuit functional
subversions listed in the Ordering Information table. When
the standby mode is entered while a dominant is present on
the bus, the “unconditioned bus wakeup” versions will
signal a buswakeup immediately after the state transition
buswakeup only after the initial dominant is released
CAN bus can be put to a lowpower mode even if the nodes
have a level sensitivity to RxD pin and a permanent
dominant is present on the bus.
Figure 4. NCV7340 Wakeup Behavior
time
CANH
CANL
STB
RxD2
RxD1
normal
standby
>tWake
<tWake
tdwakerd
tdwakedr
tWake(RxD)
(NCV73404)
(NCV73402, 3)
Overtemperature Detection
A thermal protection circuit protects the IC from damage
by switching off the transmitter if the junction temperature
exceeds a value of approximately 160
°C. Because the
transmitter dissipates most of the power, the power
dissipation and temperature of the IC is reduced. All other
IC functions continue to operate. The transmitter offstate
resets when the temperature decreases below the shutdown
threshold and pin TxD goes high. The thermal protection
circuit is particularly needed when a bus line short circuits.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCV7341 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High Speed Low Power CAN Transceiver |
| NCV7341D20G | 功能描述:CAN 接口集成電路 IMPR. HS LP CAN TRANSC. + RoHS:否 制造商:Texas Instruments 類型:Transceivers 工作電源電壓:5 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| NCV7341D20R2G | 功能描述:CAN 接口集成電路 IMPR. HS LP CAN TRANSC. + RoHS:否 制造商:Texas Instruments 類型:Transceivers 工作電源電壓:5 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| NCV7341D21G | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC HS LP CAN TRANSC. RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| NCV7341D21R2G | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC HS LP CAN TRANSC. RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
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