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參數(shù)資料
| 型號： | MCZ33742SEG |
| 廠商： | 飛思卡爾半導體(中國)有限公司 |
| 元件分類： | CAN |
| 英文描述： | System Basis Chip (SBC) with Enhanced High-Speed CAN Transceiver |
| 中文描述： | 系統(tǒng)基礎芯片的增強型（SBC）的高速CAN收發(fā)器 |
| 文件頁數(shù)： | 40/65頁 |
| 文件大?。?/td> | 1158K |
| 代理商： | MCZ33742SEG |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
40
33742
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
RXD FAILURE DETECTION
The SBC senses the RXD output voltage at each LOW-to-
HIGH transition of the differential receiver. Excluding internal
propagation delay, RXD output should be LOW when the
differential receiver is LOW. In the event RXD is shorted to
5.0 V (e.g., to VDD), RXD will be tied to a high level and the
RXD short to 5.0 V can be detected at the next LOW-to-HIGH
transition of the differential receiver. Compete detection
requires three samples.
When the error is detected, an error flag is latched and the
CAN driver is disabled. The error is reported through the SPI
register LPC, bit RXPR.
RECOVERY CONDITION
The SBC will try to recover from a bus fault condition by
sampling for a correct low level at TXD, as illustrated in
Figure 26
.
As soon as an RXD permanent recessive is detected, the
RXD driver is deactivated and a weak pull-down current
source is activated in order to allow recovery conditions. The
driver stays disabled until the failure is cleared (RXD no
longer permanent recessive) and the bus driver is activated
by an SPI register command (write 1 to the CANCLR bit in the
CAN register).
Figure 26. RXD Recovery Conditions
TXD PERMANENT DOMINANT FAILURE
PRINCIPLE
In the event TXD is set to a permanent low level, the CAN
bus is set into dominant level, and no communication is
possible. The SBC has a TXD permanent time-out detector.
After time-out, the bus driver is disabled and the bus is
released in a recessive state. The TXD permanent dominant
failure is reported in the TIM1 register.
RECOVERY
The TXD permanent dominant is used and activated also
in case of TXD short to RXD. The recovery condition for TXD
permanent dominant (recovery means the reactivation of the
CAN drivers) is done by an SPI command and is controlled
by the MCU.
The driver stays disabled until the failure is cleared (TXD
no longer permanent dominant) and the bus driver is
activated by an SPI register command (write logic [1] to
CANCLR bit in the CAN register).
TXD TO RXD SHORT CIRCUIT FAILURE
PRINCIPLE
In the event the TXD is shorted to RXD when an incoming
CAN message is received, the RXD will be at a LOW.
Consequently, the TXD pin is LOW and drives CANH and
CANL into the dominant state. The bus is stuck in dominant
mode and no further communication is possible.
DETECTION AND RECOVERY
The TXD permanent dominant timeout will be activated
and release the CANL and CANH drivers. However, at the
next incoming dominant bit, the bus will be stuck again in
dominant. In order to avoid this situation, the recovery from a
failure (recovery means the reactivation of the CAN drivers)
is done by an SPI command and controlled by the MCU.
INTERNAL ERROR OUTPUT FLAGS
There are internal error flags to signal whenever thermal
protection is activated or overcurrent detection occurs on the
CANL or CANH pins (THERM-CUR bit). The errors are
reported in the CAN register.
CANL
CANH
Diff Output
RXD Output
RXD Short to V
DD
RXD Flag
RXD Flag Latched
Sampling
Sampling
Note
RXD Flag is neither the RXPR bit in the LPC register
nor the CAN-F bit in INTR register.
RXD no longer shorted to V
DD
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| MCZ33742SEGR2 | 功能描述:網(wǎng)絡控制器與處理器 IC SBC-E-HS-CAN 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 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| MCZ33780EG | 功能描述:多路器開關 IC DBUS MASTER RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| MCZ33780EG | 制造商:Freescale Semiconductor 功能描述:DUAL DBUS MASTER INTERFACE 16SOIC |
| MCZ33780EGR2 | 功能描述:多路器開關 IC DBUS MASTER RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| MCZ33781EK | 功能描述:輸入/輸出控制器接口集成電路 DBUS2 MASTER STND RoHS:否 制造商:Silicon Labs 產(chǎn)品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
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