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| 型号： | MAX6871ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 46/51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
Forcing Programmable
Outputs High During Power-Up
A weak 10μA pulldown holds all programmable outputs
low during power-up until ABP exceeds the undervolt-
age lockout (UVLO) threshold. Applications requiring a
guaranteed high programmable output for ABP down to
GND require external pullup resistors to maintain the
logic state until ABP exceeds UVLO. Use 20k ? resis-
tors for most applications.
Driving High-Side MOSFET
Switches with the MAX6870/MAX6871
High-side MOSFET switches are commonly used in
power-supply sequencing applications. First, configure
the programmable output of the MAX6870/MAX6871 as
an active-low charge-pump output and set the condi-
tions to assert this output. Connect the programmable
output to the gate of an n-channel MOSFET. As the
conditions to deassert this output are met, the output
deasserts high (V ABP +5V), turning on the FET, thus
allowing the voltage on the drain to pass through to the
downstream device (see Figure 9).
Uses for General-
Purpose Inputs (GPI1–GPI4)
Watchdog Timer
Program GPI_ as an input to one of the watchdog
timers in the MAX6870/MAX6871. The GPI_ input must
toggle within the watchdog timeout period, otherwise
any programmable output dependent on the watchdog
timer asserts.
Additional Manual Reset Functions
The PO7 (MAX6870)/PO5 (MAX6871) programmable
outputs allow a single set (Product 1 only) of conditions
to assert the output. Program the set of conditions to
depend on one of the GPI_ inputs. Any output that
depends on GPI_ asserts when GPI_ is held in its
active state, effectively acting as a manual reset input.
Other Fault Signals from μC
Connect a general purpose output from a μC to one of
the GPI_ inputs to allow interrupts to assert any output
of the MAX6870/MAX6871. Configure one of the pro-
grammable outputs to assert on whichever GPI_ input
connects to the general purpose output of the μC.
Uses for AUXIN1 and AUXIN2
Analog Output of Current-Sense Amplifier
Figure 10 shows the MAX6870/MAX6871 in a current-
sensing application with the MAX4374. The MAX4374
generates an analog output voltage (OUT) proportional
to the voltage difference between RS+ and RS- and a
latched comparator output (COUT) indicating an over-
current condition. Connect OUT to AUXIN1 to provide
continuous monitoring of the load current on the 12V
supply. The internal ADC of the MAX6870/MAX6871
digitizes V OUT and stores the results in read-only regis-
ters 5Ch through 5Fh. COUT latches high for V CIN >
600mV, and clears with the RESET input of the MAX4374.
Configure GPI1 as an active-high input and configure
PO7 (MAX6870)/PO5 (MAX6871) to depend on GPI1.
PO7/PO5 asserts to its active state when an overcurrent
condition exists.
R SENSE
I LOAD
+5V
IN3
PO1
TO
LOAD
+12V
RS+
V CC
MAX4374
RS-
OUT
CIN
R1
IN1
AUXIN1
MAX6870
MAX6871
TO OTHER
CIRCUITRY
MAX6870
MAX6871
R2
+5V
IN3
PO7/
PO5
R3
GND
RESET
GND
COUT
GPI1
GND
Figure 9. Driving High-Side n-Channel MOSFET Switches
Figure 10. Monitoring Current-Sense Amplifier Outputs
46
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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