Overview
The ADM1191-2ARMZ-R7, produced by Analog Devices Inc., is an integrated current sense amplifier designed for precise digital current and voltage monitoring. This device incorporates an on-chip 12-bit analog-to-digital converter (ADC) that enables accurate readback of current and voltage levels through an I2C interface. The ADM1191 is particularly useful in power monitoring and management applications, offering features such as overcurrent alert, voltage monitoring, and high precision current sensing.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Conditions |
|---|---|---|---|---|---|
| VCC Operating Voltage Range | 3.15 V | - | 26 V | V | - |
| Supply Current (ICC) | 1.7 mA | 2 mA | - | mA | - |
| Undervoltage Lockout (VUVLO) | 2.8 V | - | - | V | VCC rising |
| Undervoltage Lockout Hysteresis (VUVLOHYST) | 80 mV | - | - | mV | - |
| CONV Pin Input Current (ICONV) | -2 µA | - | 2 µA | µA | - |
| Logic Low Threshold (VCONVL) | 1.2 V | - | - | V | - |
| Logic High Threshold (VCONVH) | 1.4 V | - | - | V | - |
| Operating Temperature Range | -40°C | - | 85°C | °C | - |
| Package Type | - | - | - | 10-MSOP | - |
Key Features
- Precision current sense amplifier with a 12-bit ADC for current and voltage readback.
- Overcurrent alert threshold set via the SETV input pin.
- ALERTB output provides an overcurrent interrupt.
- I2C fast mode-compliant interface with a maximum frequency of 400 kHz.
- Two address pins allowing up to 16 devices on the same I2C bus.
- CONV pin for commanding an ADC read; configurable to convert current only, voltage only, or both channels.
- Compact 10-lead MSOP package.
Applications
- Power monitoring and power budgeting.
- Central office equipment.
- Telecommunications and data communications equipment.
- PCs and servers.
Q & A
- What is the primary function of the ADM1191?
The ADM1191 is an integrated current sense amplifier that provides digital current and voltage monitoring via an on-chip 12-bit ADC.
- What is the operating voltage range of the ADM1191?
The operating voltage range is from 3.15 V to 26 V.
- How does the ADM1191 communicate with other devices?
The ADM1191 uses an I2C fast mode-compliant interface with a maximum frequency of 400 kHz.
- What is the purpose of the SETV input pin?
The SETV input pin is used to set the overcurrent alert threshold.
- How many devices can be connected on the same I2C bus?
Up to 16 devices can be connected on the same I2C bus using the two address pins.
- What is the package type of the ADM1191?
The ADM1191 is packaged in a 10-lead MSOP.
- What is the resolution of the ADC in the ADM1191?
The ADC has a resolution of 12 bits.
- What is the typical response time for the ALERTB output?
The typical response time for the ALERTB output is 1 µs to 2 µs.
- What are some common applications of the ADM1191?
Common applications include power monitoring, central office equipment, telecommunications and data communications equipment, and PCs/servers.
- How is the CONV pin used in the ADM1191?
The CONV pin is used to command an ADC read and can be configured to convert current only, voltage only, or both channels.
