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| 型号： | MAX6871ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 43/51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： | 4 |
| 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： | 5 种可调阀值电压 |
| 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 with ADC
Configuring the Watchdog Timers
(Registers 3Ch–3Fh)
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 – 3Fh configure the watchdog functionality
of the MAX6870/MAX6871. Program each watchdog
timer to assert one or more programmable outputs (see
Tables 10 – 21). Program each watchdog timer to reset on
one of the GPI_ inputs, one of the programmable out-
puts, or a combination of one GPI_ input and one pro-
grammable output.
Each watchdog timer features independent initial and
normal watchdog timeout periods. The initial watchdog
timeout 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
Table 27. Watchdog Inputs (Addresses
3Ch (Watchdog 1), 3Eh (Watchdog 2))
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.
Disable or enable each initial timeout period through reg-
isters 3Ch and 3Eh. Registers 3Dh and 3Fh program the
initial and normal watchdog timeout periods, and enable
or disable each watchdog timer. See Tables 27 and 28
for a summary of the watchdog behavior.
Fault Detector
Registers 60h – 62h store all fault conditions, including
undervoltage, overvoltage, GPI_, and watchdog timer
faults (see Table 29). Fault registers are read-only and
lose contents upon power removal. The first read com-
mand from the fault registers after power-up gives invalid
data. Any MR assertion writes to the fault register.
BIT
[1:0]
NAME
Watchdog
Input
Selection
DESCRIPTION
00 = GPI1 input
01 = GPI2 input
10 = GPI3 input
11 = GPI4 input
000 = PO1 (MAX6870), not used (MAX6871)
Reading the fault register clears all fault flags. Both GPI_
Table 28. Watchdog Timeout Period
Selection (Addresses 3Dh (Watchdog 1),
3Fh (Watchdog 2))
001 = PO2 (MAX6870), not used (MAX6871)
BIT
NAME
DESCRIPTION
[4:2]
Watchdog
Internal
Input
Selection
010 = PO3 (MAX6870), PO1 (MAX6871)
011 = PO4 (MAX6870), PO2 (MAX6871)
100 = PO5 (MAX6870), PO3 (MAX6871)
101 = PO6 (MAX6870), PO4 (MAX6871)
110 = PO7 (MAX6870), PO5 (MAX6871)
111 = PO8 (MAX6870), not used (MAX6871)
[2:0]
Normal
Watchdog
Timeout Period
000 = 6.25ms
001 = 25ms
010 = 100ms
011 = 400ms
100 = 1.6s
101 = 6.4s
00 = 11 = watchdog clear depends on
both GPI_ from 3Ch[1:0] and PO_ from
110 = 25.6s
111 = 102.4s
Watchdog 3Ch[4:2].
[6:5] Dependency 01 = watchdog clear depends only on
on Inputs PO_ from 3Ch[4:2].
10 = watchdog clear depends only on
GPI_ from 3Ch[1:0].
0 = disables initial watchdog timeout
Initial
period (normal watchdog timeout not
Watchdog
[7] affected).
Timeout
1 = enables initial watchdog timeout
Enable
period.
[5:3]
[6]
[7]
Initial Watchdog
Timeout Period
(Immediately
following power-
up, reset event,
or enabling
watchdog)
Watchdog
Enable
—
000 = 6.25ms
001 = 25ms
010 = 100ms
011 = 400ms
100 = 1.6s
101 = 6.4s
110 = 25.6s
111 = 102.4s
0 = disables watchdog timer
1 = enables watchdog timer
Not used
______________________________________________________________________________________
43
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相关代理商/技术参数 |
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| MAX6871ETJ+ | 功能描述:监控电路 EEPROM-Prog Quad 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 |
| MAX6871ETJ+T | 功能描述:监控电路 EEPROM-Prog Quad 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 |
| MAX6871ETJ-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 |
| MAX6872ETJ | 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 |
| MAX6872ETJ+ | 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 |
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