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| 型号： | MAX6874ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 34/40页 |
| 文件大小： | 0K |
| 描述： | IC SEQUENCE/SUPERVISOR 32TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 43 |
| 类型： | 序列发生器 |
| 监视电压数目： | 6 |
| 输出： | 开路漏极，推挽式 |
| 复位： | 高有效/低有效 |
| 复位超时： | 可调节/可选择 |
| 电压 - 阀值： | 8 种可选阀值组合 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 管件 |
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EEPROM-Programmable, Hex/Quad,
Power-Supply Sequencers/Supervisors
Table 19. Watchdog Timeout Period Selection
REGISTER
ADDRESS
EEPROM
MEMORY
ADDRESS
BIT
RANGE
DESCRIPTION
Normal Watchdog Timeout Period:
000 = 6.25ms
001 = 25ms
010 = 100ms
[2:0]
011 = 400ms
100 = 1.6s
101 = 6.4s
110 = 25.6s
111 = 102.4s
Initial Watchdog Timeout Period (immediately following power-up, reset event,
or enabling watchdog):
3Dh
803Dh
[5:3]
[6]
[7]
000 = 6.25ms
001 = 25ms
010 = 100ms
011 = 400ms
100 = 1.6s
101 = 6.4s
110 = 25.6s
111 = 102.4s
Watchdog Enable:
0 = Disables watchdog timer
1 = Enables watchdog timer
Not used
Configuring the Watchdog Timer
(Registers 3Ch–3Dh)
A watchdog timer monitors microprocessor (μP) soft-
ware execution for a stalled condition and resets the μP
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 μP.
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 μP to
perform its initialization process. If no pulse occurs during
the initial watchdog timeout period, the μP 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 μP 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.
34
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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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