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参数资料
| 型号： | ADM1191 |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | Digital Power Monitor with Convert Pin and ALERTB O |
| 中文描述： | 数字电源监视器转换引脚和ALERTB ? |
| 文件页数： | 14/16页 |
| 文件大小： | 269K |
| 代理商： | ADM1191 |
ADM1191
Table 15. Status Byte Operations
Bit
Name
0
ADC_OC
1
ADC_ALERT
Rev. 0 | Page 14 of 16
Function
An ADC-based overcurrent comparison has been detected on the last three conversions.
An ADC-based overcurrent trip has occurred, which has caused the alert. Cleared by writing to Bit 4 of the ALERT_EN
register.
An overcurrent condition is present (that is, the output of the current sense amplifier is greater than the voltage on the
SETV input).
An overcurrent condition has caused the ALERT block to latch a fault, and the ALERTB output has asserted. Cleared by
writing to Bit 4 of the ALERT_EN register.
Set to 1 by writing to the SWOFF bit of the CONTROL register.
An alert has been caused by the SWOFF bit. Cleared by writing to Bit 4 of the ALERT_EN register.
2
OC
3
OC_ALERT
4
5
ALERTB OUTPUT
The ALERTB output is an open-drain pin with 30 V tolerance.
This output can be used as an overcurrent flag by connecting it
to the general-purpose logic input of a controller. Under normal
operation, this output is pulled high (an external pull-up resistor
should be used because this is an open-drain pin). When an
overcurrent condition occurs, the ADM1191 pulls this output low.
OFF_STATUS
OFF_ALERT
R
SENSE
P = VI
CONTROLLER
ADM1191
SENSE
VCC
SDA
SCL
SDA
SCL
GND
ALERTB
CLRB
CLRB
ADR
TIMER
3.15V TO 26V
SETV
ALERTB
0
Figure 25. Using the ALERTB Output as an Interrupt
SETV PIN
The SETV pin allows the user to adjust the current level that
trips the ALERTB output. The output of the current sense
amplifier is compared with the voltage driven onto the SETV
pin. If the current sense amplifier output is higher than the
SETV voltage, then the output of the comparator asserts. By
driving a different voltage onto the SETV pin, the ADM1191
detects an overcurrent condition at a different current level,
with a gain of 18. See Figure 15 for an illustration of this
relationship.
ADM1191
SETV
ALERT
CURRENT
SENSE
AMPLIFIER
A
ALERT
R
SENSE
I
LOAD
APPLIED
VOLTAGE
SENSE
VCC
COMPARATOR
0
Figure 26. SETV Operation
KELVIN SENSE RESISTOR CONNECTION
When using a low value sense resistor for high current
measurement, the problem of parasitic series resistance can
arise. The lead resistance can be a substantial fraction of the
rated resistance, making the total resistance a function of lead
length. This problem can be avoided by using a Kelvin sense
connection. This type of connection separates the current path
through the resistor and the voltage drop across the resistor.
Figure 27 shows the correct way to connect the sense resistor
between the VCC pin and the SENSE pin of the ADM1191.
SENSE RESISTOR
KELVIN SENSE TRACES
VCC
SENSE
ADM1191
CURRENT
FLOW FROM
SUPPLY
CURRENT
FLOW TO
LOAD
0
Figure 27. Kelvin Sense Connections
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相关代理商/技术参数 |
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|---|---|
| ADM1191_08 | 制造商:AD 制造商全称:Analog Devices 功能描述:Digital Power Monitor with Convert Pin and ALERTB Output |
| ADM1191-2ARMZ-R7 | 功能描述:IC PWR MONITOR DGTL ALERT 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 应用:热电冷却器 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.173"，4.40mm 宽）裸露焊盘 供应商设备封装:28-TSSOP 裸露焊盘 包装:管件 产品目录页面:1410 (CN2011-ZH PDF) |
| ADM1191-2ARMZ-R71 | 制造商:AD 制造商全称:Analog Devices 功能描述:Digital Power Monitor with Convert Pin and ALERTB O |
| ADM1192 | 制造商:AD 制造商全称:Analog Devices 功能描述:Digital Power Monitor with Clear Pin and ALERT Output |
| ADM1192_08 | 制造商:AD 制造商全称:Analog Devices 功能描述:Digital Power Monitor with Clear Pin and ALERT Output |
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