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參數資料
| 型號： | MCZ33989EG |
| 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 with High-Speed CAN Transceiver |
| 中文描述： | 系統(tǒng)基礎芯片高高速CAN收發(fā)器 |
| 文件頁數： | 22/66頁 |
| 文件大小： | 1181K |
| 代理商： | MCZ33989EG |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
22
33989
FUNCTIONAL DEVICE OPERATION
RESET AND WATCHDOG PINS, SOFTWARE WATCHDOG OPERATIONS
the MCU to enter its low power mode, a deglitcher time of
typical 40 μs is implemented.
Figure 9
indicates the operation to enter Stop mode.
Figure 9. Operation Entering Stop Mode
RESET AND WATCHDOG PINS, SOFTWARE WATCHDOG OPERATIONS
SOFTWARE WATCHDOG (SELECTABLE WINDOW
OR TIMEOUT WATCHDOG)
Software watchdog uses in the SBC Normal and Standby
modes is to monitor MCU. The Watchdog can be either
window or timeout. This is selectable by SPI (register TIM1,
bit WDW). Default is window watchdog. The period for the
watchdog is selectable from the SPI from 10 ms to 350 ms
(register TIM1, bits WDT0 and WDT1). When the window
watchdog is selected, the closed window is the first part of the
selected period, and the open window is the second part of
the period. Refer to the SPI TIM register description.
Watchdog can only be cleared within the open window time.
An attempt to clear the watchdog in the closed window will
generate a reset. Watchdog is cleared through SPI by
addressing the TIM1 register.
RESET PIN DESCRIPTION
A reset output is necessary and available to reset the
microcontroller. Modes 1 and 2 are available for the reset pin
(please refer to
Table 5
for reset pin operation).
Reset causes when SBC is in mode 1:
V
DD1
falling out of range — If V
DD1
falls below the reset
threshold (parameter R
STTH
), the ret pin is pulled low until
V
DD1
returns to the normal voltage.
Power-on reset — At device power-on or at device wake-
up from Sleep mode, the reset is maintained low until V
DD1
is within its operation range.
Watchdog timeout — If watchdog is not cleared, the SBC
will pull the reset pin low for the duration of the reset time
(parameter RST
DUR)
.
In Mode 2, the reset pin is not activated in case of
Watchdog timeout. Please refer to
Table 6
for more detail.
For debug purposes at 25°C, the Reset pin can be shorted
to 5.0 V because of its internal limited current drive capability.
RESET AND WATCHDOG OPERATION: MODES1
AND 2
Watchdog and Reset functions have two modes of
operation:
SPI CS
SPI Stop/ Sleep Command
SBC in Normal or Stand-by mode
SBC in Stop mode
no I
DD1
over I wake-up
SBC in Stop mode
with I
DD1
over I wake-up
I
DD1DGLT
t
CS
STOP
Table 5. Reset and Watchdog Output Operation
Events
Mode
WD Output
Reset Output
Devices Power-up
1 or 2 (Safe Mode)
Low to High
Low to High
V
DD1
Normal Watchdog Properly Triggered
1
High
High
V
DD1
< RST
TH
1
High
Low
Watchdog Timeout Reached
1
Low
V
DD1
Normal Watchdog Properly Triggered
2 (Safe Mode)
High
High
V
DD1
< RST
TH
2 (Safe Mode)
High
Low
Watchdog Timeout Reached
2 (Safe Mode)
Low (Note)
High
Notes
27.
WD stays low until the Watchdog register is properly addressed through SPI.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MCZ33989EG | 制造商:Freescale Semiconductor 功能描述:IC SYSTEM BASIS W/CAN TRANCEIVER |
| MCZ33989EGR2 | 功能描述:網絡控制器與處理器 IC SBC-HS RoHS:否 制造商:Micrel 產品:Controller Area Network (CAN) 收發(fā)器數量: 數據速率: 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 |
| MCZ33990EF | 功能描述:網絡控制器與處理器 IC CLASS B SERIAL TRANS. RoHS:否 制造商:Micrel 產品:Controller Area Network (CAN) 收發(fā)器數量: 數據速率: 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 |
| 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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