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參數(shù)資料
| 型號： | AMIS-42665 |
| 元件分類： | CAN |
| 英文描述： | High-Speed Low Power CAN Transceiver |
| 中文描述： | 高速低功耗的CAN收發(fā)器 |
| 文件頁數(shù)： | 4/13頁 |
| 文件大小： | 368K |
| 代理商： | AMIS-42665 |
AMIS-42665 High-Speed Low Power CAN Transceiver
Data Sheet
7.0 Functional Description
7.1 Operating Modes
AMIS-42665 provides two modes of operation as illustrated in Table 3. These modes are selectable through pin STB.
Table 3: Operating Modes
Pin RXD
Mode
STB
Low
Normal
Low
Bus dominant
Bus recessive
Standby
High
Wake-up request detected
No wake-up request detected
Pin
High
7.1.1. 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.
7.1.2. Standby Mode
In standby mode both the transmitter and receiver are disabled and a very low-power 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 10μA. When a wake-up
request is detected by the low-power differential receiver, the signal is first filtered and then verified as a valid wake signal after a time
period of t
BUS
, the RxD pin is driven low by the transceiver to inform the controller of the wake-up request.
7.2 Split Circuit
The V
SPLIT
pin is operational only in normal mode. In standby mode this pin is floating. The V
SPLIT
is connected as shown in Figure 2 and
its purpose is to provide a stabilized DC voltage of 0.5 x V
CC
to the bus avoiding possible steps in the common-mode signal therefore
reducing EME. These unwanted steps could be caused by an un-powered node on the network with excessive leakage current from the
bus that shifts the recessive voltage from its nominal 0.5 x V
CC
voltage.
7.3 Wake-up
Once a valid wake-up (dominant state longer than t
BUS
) has been received during the standby mode the RxD pin is driven low.
7.4 Over-temperature 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 off-state resets when pin TxD goes high. The thermal protection
circuit is particularly needed when a bus line short circuits.
7.5 TxD Dominant Time-out Function
A TxD dominant time-out timer circuit prevents the bus lines being driven to a permanent dominant state (blocking all network
communication) if pin TxD is forced permanently low by a hardware and/or software application failure. The timer is triggered by a
negative edge on pin TxD. If the duration of the low-level on pin TxD exceeds the internal timer value t
dom
, the transmitter is disabled,
driving the bus into a recessive state. The timer is reset by a positive edge on pin TxD.
This TxD dominant time-out time (t
dom
)defines the minimum possible bit rate to 40kBaud.
7.6 Fail Safe Features
A current-limiting circuit protects the transmitter output stage from damage caused by accidental short circuit to either positive or
negative supply voltage, although power dissipation increases during this fault condition.
4
AMI Semiconductor
– Rev. 3.1, April 06
www.amis.com
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| AMIS42665AGA | High-Speed Low Power CAN Transceiver |
| AMIS42665ALA | High-Speed Low Power CAN Transceiver |
| AMIS-42700 | Dual High-Speed CAN Transceiver |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AMIS-42665_10 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High-Speed Low Power CAN Transceiver |
| AMIS42665AGA | 制造商:AMI 制造商全稱:AMI 功能描述:High-Speed Low Power CAN Transceiver |
| AMIS42665ALA | 制造商:AMI 制造商全稱:AMI 功能描述:High-Speed Low Power CAN Transceiver |
| AMIS42665TJAA1G | 功能描述:CAN 接口集成電路 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 |
| AMIS42665TJAA1RG | 功能描述:CAN 接口集成電路 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 |
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