ADM1192: 电流检测放大器
The ADM1192 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 and in 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. Alternatively, the ADC can run continuously, and the user can read the latest conversion data whenever it is required. Up to four unique I^2C addresses can be created, depending on the way the ADR pin is 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 output exceeds the SETV voltage. This event is detected at the ALERT block. The ALERT block then charges up the external TIMER capacitor with a fixed current. When this timing cycle is complete, the ALERT output asserts.
The ALERT output can be used as a flag to warn a micro-controller or field programmable gate array (FPGA) of an overcurrent condition. ALERT outputs of multiple ADM1192 devices can be tied together and used as a combined alert.
A basic P-channel FET hot swap circuit can be implemented with the ALERT output. The value of the TIMER capacitor should be set so that the charging time of this capacitor is much longer than the period where a higher than nominal inrush current may be flowing.
The ADM1192 is packaged in a 10-lead MSOP.
ADM1192 应用
- Power monitoring/power budgeting
- Central office equipment
- Telecommunication and data communication equipment
- PCs/servers
ADM1192 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
- ALERT output allows basic P-channel FET hot swap up to 26 V
- SETV input for setting overcurrent alert threshold
- Programmable overcurrent filtering via TIMER pin
- CLRB input pin
- I^2C(R) fast mode-compliant interface (400 kHz maximum)
- 10-lead MSOP
ADM1192 功能框图
ADM1192 功能框图
ADM1192 技术指标
| Voltage/Current Readback | X | Reference Adjust | X |
| Basic Hot Swap Control | PMOS to 30 V | CLRB Pin | X |
| ALERT/ALERTB | ALERTB | Number of I^2C Addresses | 4 |
ADM1192 订购指南
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| ADM1192-1ARMZ-R7 | 量产 | 10 ld MSOP | 10 | 工业 |
| EVAL-ADM1192EBZ | 量产 | 评估板 | 待定 |