EMC1704-2

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
  • 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
  • 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
  • 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
  • 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)
  • ±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
  • 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
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, 3 1, 3
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
EMC1704 Data SheetData Sheets11/13/20131320KB
AN18.15 - PCB Design Guidelines for QFN and DQFN PackagesAppNote10/16/2014205KB
EMC1704 High-Side Current-Sense and Multiple 1??C Temperature Monitor Data BriefProduct Briefs09/27/2010313KB
EMC1704-1 Reference Design Part Library, Microsoft Object Library FileSchematics09/28/200911KB
EMC1704-1 Reference Design Schematic, PDFSchematics10/02/200921KB
EMC1704-2 Reference Design Part Library, Microsoft Object Library FileSchematics09/28/200911KB
EMC1704-2 Reference Design Schematic, PDFSchematics10/02/200922KB
Ordering Information
Part NumberLeadsPackage TypeTemp RangePacking1+26+100+1000+5000+
EMC1704-2-AP-TR16QFN-40C to +85CT/R2.802.332.122.052.02
Similar Devices
ProductDescriptionFull Scale Range (mV)Bus Voltage Range (V)Price5K
EMC1701-1Current/DC Power Sensor with Temperature Monitoring10, 20, 40, 80+3 to +24
EMC1701-2Current/DC Power Sensor with Temperature Monitoring10, 20, 40, 80+3 to +24$1.12
EMC1702-1Current/DC Power Sensor with Temperature Monitoring10, 20, 40, 80+3 to +24$1.12
EMC1704-1Current/DC Power Sensor with Temperature Monitoring10, 20, 40, 80+3 to +24
EMC1704-2Current/DC Power Sensor with Temperature Monitoring10, 20, 40, 80+3 to +24$2.02
PAC1710Current/DC Power Sensor10, 20, 40, 800 to +40$0.67
PAC1720Dual Current/DC Power Sensor10, 20, 40, 800 to +40$1.18
PAC1921Current/DC Power Sensor1000 to +32$1.18
RoHS Information
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
EMC1704-2-AP-TR0.0417000.21212116QFN4x4x0.9mmMatte Tine3
EMC1704 Data Sheet EMC1704-2
AN18.15 LAN9221
EMC1704 High-Side Current-Sense and Multiple 1??C Temperature Monitor Data Brief EMC1704-2
EMC1704-1 Reference Design Schematic, PDF EMC1704-2
EMC1704-2 Reference Design Schematic, PDF EMC1704-2