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Microchip - High-Side Power/Current Monitor

Numéro de référence PAC1921
Description High-Side Power/Current Monitor
Fabricant Microchip 
Logo Microchip 





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PAC1921 fiche technique
PAC1921
High-Side Power/Current Monitor with Analog Output
Features
• Configurable Measurement Type Output: Power,
Current or Bus Voltage
• Configurable Voltage Output (3V, 2V, 1.5V, 1V)
- All output values also available over SMBus
• New Device Topology
- Provides integrated average power
measurement
- Power measurements provided to
microcontroller with ADC inputs
- Unique lossless integrating architecture
allows operation at low sense voltages
- Output voltage proportional to selected
measurement
• High-Side Current Sensor
- 100 mV full-scale current sense voltage range
- Second-order delta-sigma ADC with 11-bit or
14-bit resolution
- Selectable current binary gain ranges: 1x
through 128x
• 1% Power Measurement Accuracy
• Auto-Zero Offset
• Auto Sleep State
- Automatically shifts to low-power state
(3.5 µA)
• Power Supply
- VDD = 3.3V nominal (operational range 3.0V
to 5.5V)
• Bus Range 0V to 32V
• No Input Filters Required
• Available in a 10-pin 3 mm x 3 mm VDFN RoHS
Compliant Package
Applications
• Diagnostic Equipment
• Servers
• Power Supplies
• Industrial and Power Management Systems
• Notebook and Desktop Computers
Description
The PAC1921 is a dedicated power-monitoring device
with a configurable analog output that can present
power, current or voltage. The PAC1921 is designed for
power measurement and diagnostic systems that
cannot allow for latency when performing high-speed
power management. Measurements are accumulated
in large lossless registers, allowing for integration
periods of 500 µs to 2.9 seconds. The measurement is
averaged and presented on the analog output with a
full scale range of 3V, 2V, 1.5V or 1.0V.
The PAC1921 has a READ/INT pin for host control of the
measurement integration period. This pin can be used to
synchronize readings of multiple buses between several
devices. Alternatively, PAC1921 is able to provide
outputs in a free-running mode. Information is provided
on the OUT pin and is available via SMBus if desired.
Data sampling and output attributes, such as the internal
ADC resolution (11-bit or 14-bit) and sample rate, are
configurable. The SMBus interface has more selections
for user-configurable options.
The PAC1921 is a 1% accurate power measurement
device that measures and cancels the zero offset from
the input pins. The PAC1921 was designed to monitor
power rails from 0-32V with a full-scale capability of
100 mV across the sense resistor. No input filters are
required for this device.
Package Types
PAC1921
3x3 VDFN*
VDD 1
SENSE + 2
SENSE - 3
OUT 4
GND 5
10 SM_CLK
9 SM_DATA
EP
11
8 READ/INT
7 RESERVED
6 ADDR_SEL
*Includes Exposed Thermal Pad (EP), see Table 3-1
2012-2016 Microchip Technology Inc.
DS20005293D-page 1

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