EMC1701
High-Side Current-Sense and Internal
1°C Temperature Monitor
PRODUCT FEATURES
General Description
The EMC1701 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. The EMC1701 also measures the source
voltage and uses these measured values to present a
proportional power calculation. The EMC1701 contains
additional bi-directional peak detection circuitry to flag
instantaneous current spikes with programmable time
duration and magnitude threshold. Finally, the EMC1701
includes an internal diode channel for ambient temperature
measurement.
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.
Datasheet
Features
High-side current sensor
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—
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—
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Bi-directional current measurement
Measures source voltage and indicates power ratio
1% current measurement accuracy
Integrated over 82ms to 2.6sec with 11-bit resolution
3V to 24V bus voltage range
Independent hardware set instantaneous current peak
detector (EMC1701-1 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
Internal temperature monitor
ALERT and THERM outputs for temperature, voltage,
and out-of-current limit reporting
SMBus 2.0 interface
— Pin-selectable SMBus Address
— Block Read and Write
— ±1°C accuracy (-5°C < T
A
< 85°C)
Applications
Notebook and Desktop Computers
Industrial
Power Management Systems
Embedded Applications
Available in a 12-pin 4mm x 4mm QFN RoHS Compliant
Package (EMC1701-1)
Available in a 10-pin MSOP RoHS Compliant Package
(EMC1701-2)
Block Diagram
DUR_SEL*
TH_SEL*
Peak
Detection
Current Limits
13 - 15 bit
Σ Δ
ADC
Current Registers
SMBus
Slave
Protocol
SENSE+
SENSE-
ADDR_SEL
SMCLK
SMDATA
ALERT
THERM
Internal
Temp
Diode
Analog
Mux
Configuration
Power Register
11 - 15 bit
Σ Δ
ADC
Voltage and
Temp Registers
Voltage and
Temp Limits
*EMC1701-1 only
SMSC EMC1701
DATASHEET
Revision 1.2 (09-27-10)
SMSC [ SMSC CORPORATION ]
