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參數(shù)資料
| 型號(hào)： | MCZ33989EG |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 元件分類： | CAN |
| 英文描述： | System Basis Chip with High-Speed CAN Transceiver |
| 中文描述： | 系統(tǒng)基礎(chǔ)芯片高高速CAN收發(fā)器 |
| 文件頁數(shù)： | 49/66頁 |
| 文件大?。?/td> | 1181K |
| 代理商： | MCZ33989EG |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
49
33989
TYPICAL APPLICATIONS
SUPPLEMENTAL APPLICATION NOTES
CAN LOW POWER MODE AND WAKE UP
Low Power Mode
In low power mode the CAN is internally supplied from the
VSUP pin. The voltage at V2 pin can be either at 5 V or turned
off. The current sourced from V2, when the CAN is in sleep
mode, is extremely low. In most case the V2 voltage is off,
however the CAN can be set into sleep mode even with 5 V
applied on V2.
In low power mode the CANH and CANL driver are
disabled, and the receiver is also disabled. CANH and CANL
have a typical 50 k ohm impedance to gnd. The wake-up
receiver can be activated if wake-up is enable by an SPI
command.
When the device is set back into TX RX mode by an SPI
command, CANH and CANL are set back into the recessive
level. This is illustrated in
Figure 39
.
Figure 39. Low Power Mode
Wake-Up
When the CAN interface is in sleep mode with wake up
enabled, the CAN bus traffic is detected. The wake-up option
has to be enabled prior to setting the CAN in sleep mode. The
CAN bus wake-up is a pattern wake-up.
If the CAN is set into sleep mode with “wake-up disabled”,
bus traffic will not be detected by the MC33989.
CAN Wake-Up Report: From the SBC in Sleep or Stop
Mode
The CAN wake-up reports depend upon the MC33989 low
power mode. If the MC33989 is set into sleep mode (V1 and
V2 off), the CAN wake-up or any wake-up is reported to the
MCU by the V1 turn on, leading to MCU supply turn on and
reset release.
If the SBC is in stop mode (V2 of and V1 active), the CAN
wake-up or any wake-up is reported by a pulse on the INT
output.
CAN Wake-Up Report: From the SBC in Normal or
Standby Mode
If the SBC is in normal or standby mode, and the CAN
interface is in sleep mode with wake-up enabled, the CAN
wake-up will be reported by the bit CANWU in the CAN
register.
In case the SBC uses such configuration, the SBC in
normal mode and CAN sleep mode with wake up enable, it is
recommended to check for the CAN WU bit prior to setting
the MC33989 is sleep or stop mode, in case bus traffic has
occurred while the CAN interface was in sleep mode.
CAN Wake-Up Report in the SPI Registers
After a CAN wake-up, a flag is set in the CAN register. Bit
CAN-WU reports a CAN wake-up event while the SBC was in
sleep, stop, normal or standby mode. This bit is set until the
CAN is set by the SPI command in normal mode and CAN
register read.
Pattern Wake-Up
In order to wake-up the CAN interface, the following
criteria must be fulfilled:
The CAN interface wake-up receiver must receive a
series of 3 consecutive valid dominant pulses, each of
them has to be longer than 500 ns and shorter than
500
μ
s.
The distance between 2 pulses must be lower than
500
μ
s and the three pulse must occur within a time
frame of 1 ms.
CANL
CANH
TX
RX
GND
2.5V
CANL-DOM
CANH-DOM
CANL/CANH-REC
CAN in Normal mode
CAN in Sleep mode
(wake-up enable or disable)
CAN in TX RX mode
(controlled by SPI command)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MCZ33989EG | 制造商:Freescale Semiconductor 功能描述:IC SYSTEM BASIS W/CAN TRANCEIVER |
| MCZ33989EGR2 | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC SBC-HS 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 |
| MCZ33990EF | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC CLASS B SERIAL TRANS. 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 |
| MCZ33990EF | 制造商:Freescale Semiconductor 功能描述:TRANCEIVER J-1850 CLASS B 8SOIC |
| MCZ33990EF/R2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Enhanced Class B Serial Transceiver |
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