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参数资料
| 型号： | MAX6874ETJ |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | EEPROM-Programmable, Hex/Quad, Power-Supply Sequencers/Supervisors |
| 中文描述： | 6-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC32 |
| 封装： | 7 X 7 MM, 0.80 MM HEIGHT, MO-220, TQFN-32 |
| 文件页数： | 28/40页 |
| 文件大小： | 337K |
| 代理商： | MAX6874ETJ |
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MAX6874/MAX6875
EEPROM-Programmable, Hex/Quad,
Power-Supply Sequencers/Supervisors
34
______________________________________________________________________________________
Configuring the Watchdog Timer
(Registers 3Ch–3Dh)
A watchdog timer monitors microprocessor (P) soft-
ware execution for a stalled condition and resets the P
if it stalls. The output of a watchdog timer (one of the
programmable outputs) connects to the reset input or a
nonmaskable interrupt of the P.
Registers 3Ch–3Dh configure the watchdog functionality
of the MAX6874/MAX6875. Program the watchdog timer
to assert one or more programmable outputs (see Tables
7–14). Program the watchdog timer to reset on one of the
GPI_ inputs, one of the programmable outputs, or a com-
bination of one GPI_ input and one programmable out-
put.
The watchdog timer features independent initial and nor-
mal watchdog timeout periods. The initial watchdog time-
out period applies immediately after power-up, after a
reset event takes place, or after enabling the watchdog
timer. The initial watchdog timeout period allows the P to
perform its initialization process. If no pulse occurs during
the initial watchdog timeout period, the P is taking too
long to initialize, indicating a potential problem.
The normal watchdog timeout period applies in every
other cycle after the initial watchdog timeout period
occurs. The normal watchdog timeout period monitors
a pulsed output of the P that indicates when normal
processor behavior occurs. If no pulse occurs during
the normal watchdog timeout period, this indicates that
the processor has stopped operating or is stuck in an
infinite execution loop.
Register 3Dh programs the initial and normal watchdog
timeout periods, and enables or disables the watchdog
timer. See Tables 18 and 19 for a summary of the watch-
dog behavior.
Configuration Lock
Lock the configuration register bank and configuration
EEPROM contents after initial programming by setting
the lock bit high (see Table 20). Locking the configura-
tion prevents write operations to all registers except the
configuration lock register. Clear the lock bit to recon-
figure the device.
Table 19. Watchdog Timeout Period Selection
REGISTER
ADDRESS
EEPROM
MEMORY
ADDRESS
BIT
RANGE
DESCRIPTION
[2:0]
Normal Watchdog Timeout Period:
000 = 6.25ms
001 = 25ms
010 = 100ms
011 = 400ms
100 = 1.6s
101 = 6.4s
110 = 25.6s
111 = 102.4s
[5:3]
Initial Watchdog Timeout Period (immediately following power-up, reset event,
or enabling watchdog):
000 = 6.25ms
001 = 25ms
010 = 100ms
011 = 400ms
100 = 1.6s
101 = 6.4s
110 = 25.6s
111 = 102.4s
[6]
Watchdog Enable:
0 = Disables watchdog timer
1 = Enables watchdog timer
3Dh
803Dh
[7]
Not used
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6874ETJ+ | 功能描述:监控电路 EEPROM-Prog Hex Power-Sup Sequencer RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX6874ETJ+T | 功能描述:监控电路 EEPROM-Prog Hex Power-Sup Sequencer RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX6874ETJ-T | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX6874TCC+ | 制造商:Maxim Integrated Products 功能描述: |
| MAX6875ETJ | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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