BEHAVIOR AT POWER UP AND POWER DOWN . Figure 30" />
參數(shù)資料
型號： MCZ33903BS3EK
廠商： Freescale Semiconductor
文件頁數(shù)： 55/106頁
文件大?。?/td> 0K
描述： IC SBC CAN HS 3.3V 32SOIC
標準包裝： 42
應(yīng)用： 系統(tǒng)基礎(chǔ)芯片
接口： CAN，LIN
電源電壓： 5.5 V ~ 28 V
封裝/外殼： 32-SSOP（0.295"，7.50mm 寬）裸露焊盤
供應(yīng)商設(shè)備封裝： 32-SOICW 裸露焊盤
包裝： 管件
安裝類型： 表面貼裝
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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MCZ33903BS3EKR2 功能描述:CAN 接口集成電路 Canvas 32 SL (3.3V) 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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