ADM1191: 电流检测放大器
The ADM1191 is an integrated current sense amplifier that offers digital current and voltage monitoring via an on-chip, 12-bit analog-to-digital converter (ADC), communicated through an I^2C interface.
An internal current sense amplifier senses voltage across the sense resistor in the power path via the VCC pin and the SENSE pin.
A 12-bit ADC can measure the current seen in the sense resistor, as well as the supply voltage on the VCC pin.
An industry-standard I^2C interface allows a controller to read current and voltage data from the ADC. Measurements can be initiated by an I^2C command or via the convert (CONV) pin. The CONV pin is especially useful for synchronizing reads on multiple ADM1191 devices. Alternatively, the ADC can run continuously, and the user can read the latest conversion data whenever it is required. Up to 16 unique I^2C addresses can be created, depending on the way the A0 pin and the A1 pin are connected.
A SETV pin is also included. A voltage applied to this pin is internally compared to the output voltage on the current sense amplifier. The output of the SETV comparator asserts when the current sense amplifier ouput exceeds the SETV voltage. When this event occurs, the ALERTB output asserts.
The ALERTB output can be used as a flag to warn a micro-controller or field programmable gate array (FPGA) of an overcurrent condition. ALERTB outputs of multiple ADM1191 devices can be tied together and used as a combined alert.
The ADM1191 is packaged in a 10-lead MSOP.
ADM1191 应用
- Power monitoring/power budgeting
- Central office equipment
- Telecommunication and data communication equipment
- PCs/servers
ADM1191 特点
- Powered from 3.15 V to 26 V
- Precision current sense amplifier 、
- Precision voltage input
- 12-bit ADC for current and voltage readback
- Convert pin (CONV) for commanding an ADC read
- SETV input for setting overcurrent alert threshold
- ALERTB output provides an overcurrent interrupt
- I^2C(R) fast mode-compliant interface (400 kHz maximum)
- Two address pins allow 16 devices on the same bus
- 10-lead MSOP
ADM1191 功能框图
ADM1191 功能框图
ADM1191 技术指标
| Voltage/Current Readback | X | Reference Adjust | X |
| ALERT/ALERTB | ALERTB | Number of I^2C Addresses | 16 |
ADM1191 订购指南
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| ADM1191-2ARMZ-R7 | 量产 | 10 ld MSOP | 10 | 工业 |
| EVAL-ADM1191EBZ | 量产 | 评估板 | 待定 |