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| 型号： | MCZ33903B5EK |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 55/106页 |
| 文件大小： | 0K |
| 描述： | IC SBC CAN HS 5.0V 32SOIC |
| 标准包装： | 42 |
| 应用： | 系统基础芯片 |
| 接口： | CAN，LIN |
| 电源电压： | 5.5 V ~ 28 V |
| 封装/外壳： | 32-BSOP（0.295"，7.50mm 宽）裸露焊盘 |
| 供应商设备封装： | 32-SOICW 裸露焊盘 |
| 包装： | 管件 |
| 安装类型： | 表面贴装 |
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Analog Integrated Circuit Device Data
52
Freescale Semiconductor
33903/4/5
FAIL-SAFE OPERATION
BEHAVIOR AT POWER UP AND POWER DOWN
.
Figure 30. Safe Operation Flow Chart
Conditions to Set SAFE Pin Active Low
Watchdog refresh issue: SAFE activated at 1st reset pulse
or at the second consecutive reset pulse (selected by bit 4,
INIT watchdog register).
VDD low: VDD < RST-TH. SAFE pin is set low at the same
time as the RST pin is set low.
The RST pin is monitored to verify that reset is not
clamped to a low level preventing the MCU to operate. If this
is the case, the Safe mode is entered.
watchdog failure
VDD low:
Rst s/c GND:
- SAFE low
8 consecutive watchdog failure (5)
State A: RDBG <6.0 k AND
- SAFE low
- Reset: 1.0 ms
- VDD ON
- Reset low
INIT,
b) ECU external signal
State B1: RDBG =15k AND
State B3:
State B2:
- SAFE low
- Reset low
- VDD OFF
a) Evaluation of
Bus idle timeout expired
Normal, FLASH
VDD <VDD_UVTH
Rst <2.5 V, t >100 ms
Device state:
RESET
NR
bit 4, INIT watchdog = 1 (1)
detection of 2nd
consecutive watchdog failure
SAFE low
SAFE high
SAFE low
Reset: 1.0 ms pulse
bit 4, INIT watchdog = 0 (1)
Reset: 1.0 ms pulse
Normal Request
power up, or SPI
at DBG pin during
RESET
SAFE pin release
failure recovery, SAFE pin remains low
SPI (3)
AND Bus idle time out expired
RESET
Wake-up (2), VDD ON, SAFE pin remains low
register content
(SAFE high)
Failure events
1) bit 4 of INIT Watchdog register
2) Wake-up event: CAN, LIN or I/O-1 high level (if I/O-1 Wake-up previously enabled)
3) SPI commands: 0xDD00 or 0xDD80 to release SAFE pin
4) Recovery: reset low condition released, VDD low condition released, correct SPI watchdog refresh
5) detection of 8 consecutive watchdog failures: no correct SPI watchdog refresh command occurred for duration of 8 x 256 ms.
6) Dynamic behavior: 1.0 ms reset pulse every 256 ms, due to no watchdog refresh SPI command, and device state transition
Legend:
RDBG = 33 k AND I/O-1 low
RDBG = 47 k AND I/O-1 low
- VDD ON
(6)
- SAFE low
- VDD ON
- Reset low
periodic pulse
State A: RDBG <6.0 k AND
watchdog failure
(VDD low or RST s/c GND) failure
sa
fe
stat
e
A
safe
st
ate
B
Resistor detected
between RESET and NORMAL REQUEST mode, or INIT RESET and INIT modes.
- bus idle time out
- I/O-1 monitoring
monitoring (7):
7) 8 second timer for bus idle timeout. I/O-1 high to low transition.
SAFE Operation Flow Chart
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCZ33903B5EKR2 | 功能描述:CAN 接口集成电路 SBC W/HIGH SPEED CAN 5V RoHS:否 制造商:Texas Instruments 类型:Transceivers 工作电源电压:5 V 电源电流: 工作温度范围:- 40 C to + 85 C 封装 / 箱体:SOIC-8 封装:Tube |
| MCZ33903B5R2 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:SBC Gen2 with CAN High Speed and LIN Interface |
| MCZ33903BD3EK | 功能描述:CAN 接口集成电路 Canvas 32 DL (3.3V) RoHS:否 制造商:Texas Instruments 类型:Transceivers 工作电源电压:5 V 电源电流: 工作温度范围:- 40 C to + 85 C 封装 / 箱体:SOIC-8 封装:Tube |
| MCZ33903BD3EKR2 | 功能描述:CAN 接口集成电路 Canvas 32 DL (3.3V) RoHS:否 制造商:Texas Instruments 类型:Transceivers 工作电源电压:5 V 电源电流: 工作温度范围:- 40 C to + 85 C 封装 / 箱体:SOIC-8 封装:Tube |
| MCZ33903BD3R2 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:SBC Gen2 with CAN High Speed and LIN Interface |
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