Multi-Channel DC Power/Energy Monitor with Accumulator
Features
• High-Side Current Monitor with 2, 3 or 4 Channels
- 100 mV full-scale range for current sense
voltage,16 bit resolution
- Selectable bidirectional current sense
capability, -100 mV to +100 mV range, 16 bit
two’s complement (signed) data format
- External sense resistor sets full scale current
range
- Very low input current simplifies routing
• Wide Bus Voltage Range for Voltage Monitor
- 0V to 32V input common-mode voltage
- 16 bit resolution for voltage measurements,
14 bits are used for power calculations
• Real Time Auto-Calibration of Offset and Gain
Errors for Voltage and Current, No User
Adjustment Required
• 1% Power Measurement Accuracy over a Wide
Dynamic Range
• On-Chip Accumulation of 28-bit Power Results for
Energy Measurement
- 48-bit power accumulator register for
recording accumulated power data
- 24 bit Accumulator Count
- User programmable sampling rates of 8, 64,
256 and 1024 samples per second
- 17 minutes of power data accumulation
minimum at 1024 S/s
- Over 36 hours of power data accumulation
minimum at 8 S/s
• 2.7V to 5.5V Supply Operation
- Separate V
DD
I/O pin for digital I/O
- 1.62-5.5V capable SMBus and digital I/O
- SMBus 3.0 and I
2
C Fast Mode Plus (1Mb/S)
• SMBus Address – 16 Options, set with Resistor
• No Input Filters Required
• ALERT Features that can be Enabled:
- ALERT on accumulator overflow
- ALERT on Conversion Complete
• 4x4x0.5 mm UQFN Package
• 2.225x2.17 mm WLCSP Package
Applications
•
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•
•
•
•
•
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Embedded Computing
Networking
FPGA Systems
Automotive
Low Voltage/High Power – AI, GPU
Industrial
Linux
®
Applications
Notebook and Tablet Computing
Cloud, Linux and Server Computing
Optical Networking Modules
Computing Platform Support
• Windows
®
10 Driver
• Linux Driver
• Python™ Script
Description
The PAC1932/3/4 are two, three and four-channel
power and energy monitoring devices. A high-voltage
multiplexer sequentially connects the inputs to a bus
voltage monitor and current sense amplifier that feed
high-resolution ADCs. Digital circuitry performs power
calculations and energy accumulation.
This enables energy monitoring with integration
periods from 1 ms up to 36 hours or longer. Bus
voltage, sense resistor voltage and accumulated
proportional power are stored in registers for retrieval
by the system master or Embedded Controller.
The sampling rate and energy integration period can be
controlled over SMBus or I
2
C. Active channel selection,
one-shot measurements and other controls are also
configurable by SMBus or I
2
C.
The PAC1932/3/4 device family uses real time
calibration to minimize offset and gain errors. No input
filters are required for this device.
2017-2019 Microchip Technology Inc.
DS20005850D-page 1
PAC1932/3/4
Package Types
PAC1932/3/4 – Top View
4x4x 0.5 mm UQFN*
13
SENSE2+
14
SENSE2-
16
PWRDN
PAC1932/3/4 – Top View
2.225x2.17 mm WLCSP
1
2
3
4
V
DD
I/O
A
SENSE2+
SENSE1-
SENSE1+
V
DD
SLOW/ALERT
V
DD
GND
SM_CLK
1
2
15
12
11
SENSE1-
SENSE1+
SENSE4+
SENSE4-
B
SENSE2-
V
DD
I/O
PWRDN
GND
Exposed pad
3
4
10
9
C
SENSE3-
ADDRSEL
SLOW/ALERT
SM_CLK
5
6
7
SENSE3-
ADDRSEL
SM_DATA
SENSE3+
8
D
SENSE3+
SENSE4-
SENSE4+
SM_DATA
*Includes Exposed Thermal Pad; see
Table 3-1.
Device Block Diagram
V
DD
GND
SENSE 1+
V
BUS1
SENSE 1-
SENSE 2+
Sen se1+
Sen se1-
V
BUS2
Sen se2+
Sen se2-
V
BUS3
Sen se3+
Sen se3-
Differen tia l
V
SENS E
Amplifier
V
BUS
Buffer/
Divi der
16-bit
ADC
Calculation
and
Calibra tion
V
BUS
Registe rs
V
DD
I/O
16-bit
ADC
V
SENS E
Registe rs
I C/SMBus
2
SENSE 2-
SENSE 3+
V
POWE R
Registe rs
SM_CLK
SM_DATA
SLO W/ALE RT
Accumlato r
SENSE 3-
SENSE 4+
Accumulator
Registe rs
V
BUS4
Sen se4+
Sen se4-
High
Voltage
MUX
ADC/MUX Clocking &
Control
Control
Registe rs
PWRDN
SENSE 4-
Resistor
Decoder
ADDRS EL
Note:
For PAC1932, channels 3 and 4 are inactive.
For PAC1933, channel 4 is inactive.
DS20005850D-page 2
2017-2019 Microchip Technology Inc.
PAC1932/3/4
1.0
1.1
ELECTRICAL CHARACTERISTICS
Electrical Specifications
Absolute Maximum Ratings
(†)
V
DD
pin............................................................................................................................................................-0.3 to 6.0V
Voltage on SENSE- and SENSE+ pins............................................................................................................-0.3 to 40V
Voltage on any other pin to GND .........................................................................................................GND -0.3 to +6.0V
Operating Ambient Temperature Range ..................................................................................................... -40 to +150°C
Storage Temperature Range....................................................................................................................... -55 to +150°C
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