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EMC1704-1

Status: In Production

Features:

  • 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
  • Software controls to program time duration and magnitude threshold
  • Bus or separately powered for low voltage operation
  • Wide temperature operating range: -40°C to +85°C
  • 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
  • ±1°C accuracy (-5°C < TA < 85°C)
  • ALERT# and THERM# outputs for temperature, voltage, and out-of-current limit reporting
  • 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)
  • Notebook and Desktop Computers
  • Industrial
  • Power Management Systems
  • Embedded Applications
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Overview
Documents
Development Environment
Similar Devices
RoHS Information
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Device Overview

Summary

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.

Additional Features

    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
Parametrics
Name
Value
Description
Current/DC Power Sensor with Temperature Monitoring
Vsense min FSR (mV)
-10, -20, -40, -80
Vsense max FSR (mV)
10, 20, 40, 80
Vsense accuracy (% FSR, max)
0.9
Vbus Range min (V)
3
Vbus Range max (V)
24
Vbus accuracy (% FSR, max)
0.05
Sampling Interval min (msec)
2.5
Sampling Interval max (msec)
2600
Remote Temperature Monitors
3
# Ambient Temperature Monitors
1
Temperature Accuracy Typical (&deg;)
0.25
Temperature Accuracy Max (&deg;)
1
Alert/Therm
2
Peak Detection
Software
Interface
SMBus/I2C
Address Select
8

Documents

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Data Sheet

11/13/2013
1320KB

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