The EMC1704 is a combination high-side current sensing device with precision temperature measurement. It measures the voltage developed across an external sense resistor to represent the high-side current of a battery or voltage regulator. It also measures the bus voltage and uses these measured values to present a proportional power calculation. The EMC1704 contains additional bidirectional peak detection circuitry to flag instantaneous current spikes with programmable time duration and magnitude threshold. Finally, the EMC1704 includes up to three (3) external diode channels and an internal temperature sensor for temperature measurement.

The temperature measurement includes advanced features such as Resistance Error Correction (REC), Beta Compensation (to support CPU diodes requiring the BJT/transistor model including 45nm and 65nm processors), and automatic diode type detection.

Both current sensing and temperature monitoring include two tiers of protection: one that can be masked and causes the ALERT# pin to be asserted, and the other that cannot be masked and causes the THERM# pin to be asserted.

Features

  High-side current sensor

  Bi-directional current measurement

  Measures bus voltage

  1% current measurement accuracy

  Integrated over 82ms to 2.6sec with 11-bit resolution

  3V to 24V voltage bus voltage range

  Calculates proportional power

  Independent hardware set instantaneous current peak detector (EMC1704-2 only)

  Software controls to program time duration and magnitude threshold

  Power supply options

  Bus or separately powered for low voltage operation

  Wide temperature operating range: -40°C to +85°C

  Up to three external temperature monitors

  1°C accuracy (20°C < TDIODE < 110°C) with 0.125°C resolution

  Ideality factor setting

  Support for 45nm and 65nm CPU diodes requiring the BJT/transistor model with beta compensation

  Determines external diode type and optimal settings

  Resistance Error Correction

  Anti-parallel diode support for additional diode options

  Internal temperature monitor

  ±1°C accuracy (-5°C < TA < 85°C)

  ALERT# and THERM# outputs for temperature, voltage, and out-of-current limit reporting

  I2C/SMBus 2.0 interface

  Pin-selectable SMBus Address

  Block Read and Write

  General Purpose I/O

  Available in a RoHS Compliant Package: 14-pin SOIC (EMC1704-1) or 16-pin 4mm x 4mm QFN (EMC1704-2)

Applications

  Notebook and Desktop Computers

  Industrial

  Power Management Systems

  Embedded Applications