EMC1702-1

The EMC1702 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 EMC1702 contains additional bidirectional peak detection circuitry to flag instantaneous current spikes with programmable time duration and magnitude threshold. Finally, the EMC1702 includes an external diode channel for temperature measurement as well as an internal diode for ambient temperature measurements.

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
  • 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 Software controls to program time duration and magnitude threshold
  • Software controls to program time duration and magnitude threshold
  • Power supply options Bus or separately powered for low voltage operation
  • Bus or separately powered for low voltage operation
  • Wide temperature operating range: -40°C to +85°C
  • One external temperature monitor 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
  • 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
  • Internal temperature monitor ±1°C accuracy (-5°C < TA < 85°C)
  • ±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
  • Pin-selectable SMBus Address
  • Block Read and Write
  • Available in a 12-pin 4mm x 4mm QFN RoHS Compliant Package
  • Notebook and Desktop Computers
  • Industrial
  • Power Management Systems
  • Embedded Applications
Parameter
Parameter Name Value Value
# Current Sensors 1 1
Description Current/DC Power Sensor with Temperature Monitoring Current/DC Power Sensor with Temperature Monitoring
Full Scale Range (mV) 10, 20, 40, 80 10, 20, 40, 80
Current Measuerment Max Accr (%) ±1 ±1
Effective Sampling Interval min to max (msec) 2.5 to 2600 2.5 to 2600
Bus Voltage Range (V) +3 to +24 +3 to +24
# Temperature Monitors (ambient, remote) 1, 1 1, 1
Temperature Accuracy Typ / Max (°C) ±0.25 / ±1.0 ±0.25 / ±1.0
Alert/Therm 2 2
Peak Detection Hardware Hardware
Interface SMBus/I2C SMBus/I2C
Address Select yes yes
Documents
EMC1702 High-Side Current-Sense and Dual 1??C Temperature Monitor Data SheetData Sheets09/27/2010823KB
AN18.15 - PCB Design Guidelines for QFN and DQFN PackagesAppNote10/16/2014205KB
EMC1702 High-Side Current-Sense and Dual 1??C Temperature Monitor Data BriefProduct Briefs09/27/2010219KB
EMC1702 Reference Design Part Library, Microsoft Object Library FileSchematics09/28/200911KB
EMC1702 Reference Design Schematic, PDFSchematics10/02/200921KB
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EMC1702 High-Side Current-Sense and Dual 1??C Temperature Monitor Data Sheet EMC1702-1
AN18.15 LAN9221
EMC1702 High-Side Current-Sense and Dual 1??C Temperature Monitor Data Brief EMC1702-1
EMC1702 Reference Design Schematic, PDF EMC1702-1