PAC1720 Datasheet, PDF (1/47 Pages) SMSC Corporation – Dual High-Side Current Sense Monitor with Power Calculation

PAC1720
Dual High-Side Current Sense Monitor
with Power Calculation
PRODUCT FEATURES
Datasheet
General Description
The PAC1720 is a dual high-side bi-directional current
sensing monitor with precision voltage measurement
capabilities. Each sensor measures the voltage
developed across an external sense resistor to
represent the high-side current of a battery or voltage
regulator. The PAC1720 also measures the SENSE+ pin
voltage and calculates average power over the
integration period. The PAC1720 can be programmed to
assert the ALERT pin when high and low limits are
exceeded for Current Sense and Bus Voltage.
Available in a RoHS compliant 3 X 3mm 10-pin DFN
package.
The PAC1720 device is good for measuring dynamic
power. The long integration time allows for extending
system polling cycles without losing any power
consumption information. In addition the alert ensures
that transient events are captured between the polling
cycles.
Applications
„ Notebook and Desktop Computers
„ Industrial
„ Power Management Systems
„ Embedded Applications
Features
„ Dual high-side current sensor
— Current measurement is integrated over 2.5ms to
2.6sec with up to 11-bit resolution
— 1% current measurement accuracy in positive range
— Measures V_SOURCE voltages
„ Calculates proportional power
„ V_SOURCE voltage range 0V to 40V
— Bi-directional current sensing
„ Auto-zero input offset voltage
„ Digital averaging
— Adjustable sampling time and resolution
„ 5µA typical Standby current
„ Programmable sense voltage range
— ±10mV, ±20mV, ±40mV, and ±80mV
„ Power supply range 3.0V to 5.5V
„ Wide temperature operating range: -40°C to +85°C
„ ALERT output for voltage and current out of limit
transients between sampling interval
„ SMBus 2.0 communications interface
— Address selectable by resistor decode
„ Sample time configurable from 2.5ms-320ms
— With averaging effective sampling times up to 2.6sec
„ 3x3 mm DFN-10 package
Block Diagram
Current
Measurement
Configuration
Voltage
Measurement
Power
Management
Current
Measurement
Configuration
Voltage
Measurement
Analog
MUX
Current Limits
Current Registers
Power Register
Voltage
Registers
Voltage Limits
GND
SMBus
Interface
ADDR_SEL
SMCLK
SMDATA
ALERT
SMSC PAC1720
SMSC CONFIDENTIAL DATASHEET
Revision 1.1 (12-08-11)