Features
• 100 μA Active Current when Sampling at 1,024 sps
• High-Side Current Monitor with a Single Channel:
◦ 100 mV Full Scale Range (FSR) for Sense Input
Voltage (VSENSE) with 12-bit Resolution
◦ Selectable Bipolar Current Sense Capability:
¤ -100 mV to + 100 mV FSR
¤ -50 mV to +50 mV Programmable FSR/2
◦ Very Low VBUS+ and Sense Pins Input Current
Simplifies Routing
• Voltage Monitor with Wide Bus Voltage Range:
◦ 9V FSR for VBUS with 12-bit Resolution
◦ Selectable Bipolar Bus Voltage (VBUS) Capability:
¤ -9V to +9V FSR
¤ -4.5V to +4.5V Programmable FSR/2
• Real Time Auto-calibration of Offset Error for
Voltage and Current; No User Adjustment
• 1% Power Measurement Accuracy over a Wide
Dynamic Range
• On-chip Accumulation of 24-bit Results for Power
Measurement:
◦ 56-bit Power Accumulator Register for Recording
Accumulated Power Data
◦ 32-bit Accumulator Count Register
• User Programmable Sample Rates (ƒS) of
8, 64, 256, 1024, 4096 and 8192 sps
◦ User Programmable ƒS = 16,384 sps for VBUS or
VSENSE (only one signal at a time)
◦ Single-shot Modes using Refresh Commands or
General Purpose Input/Output (GPIO)
• SLOW Pin for Improved Low Power Mode
• 2.7V to 5.5V Supply Operation:
◦ 1.62V to 5.5V Capable I2C/SMBus and Digital I/O
◦ SMBus 3.1 and I2C Fast-mode Plus (1 MHz)
◦ I2C High-speed Mode (3.4 MHz)
• SMBus Address – 16 Options, Set by Connecting
Pins A0 or A1 to the VDD, GND, SDA or SCL Pins
• A0/A1 Pins can Function as ALERT Pins for
Specific Addresses
• No Input Filters Required
• Step Limit for Average Variation Detection
• Patent Pending Addressing Alert Scheme
• Alerts Can Be Enabled for Accumulator Overflow,
Conversion Cycle Complete and Limit Excursions
such as Overvoltage, Undercurrent or Overpower
• AEC-Q100 Qualified (Automotive Applications):
◦ Footprint Compatible with INA219, INA232 and
INA236 from Texas Instruments
• Available Packages:
◦ 3x3 mm 8-Lead VDFN with Multiple Exposed
Pads and Stepped Wettable Flanks:
¤ Footprint Compatible with 8-Lead SOT-23-8
◦ 3x3 mm 10-Lead VDFN
• 10-Lead VDFN Only Features:
◦ Hardware Controlled Power-down Mode
◦ Low-side Power Monitor
Description
PAC1721 is a single-channel power monitor with a bus
voltage monitor and current sense amplifier that feed
into a 12-bit resolution Analog-to-Digital Converter
(ADC). Designed for low-side or high-side current
sensing, its digital circuitry performs power calculations
and energy accumulation and enables the device to
monitor power with integration periods up to one year
or longer.
The device stores bus voltage (VBUS), shunt resistor
voltage (VSENSE) and accumulated proportional power
(VPOWER) data. The embedded controller or system
host can read the PAC1721 registers and retrieve the
stored data.
PAC1721 includes a configurable alert system that can
trigger alerts when the device detects voltage, current
or power excursions.
Use SMBus or I2C communication to program the alert
system and other controls, such as sample rate, power
integration period or single-shot measurement settings.
PAC1721 uses real-time calibration to minimize offset
error. No input filters are required for this device. The
built-in adjustable averaging function produces very
low noise, high resolution measurement results.
The 10-Lead VDFN PAC1721 package has a VBUS+
pin that enables low-side power monitoring. This allows
additional power savings using a Power-down feature
not available for the 8-Lead VDFN package.
Applications
• Low Current General Purpose Applications
• Battery Powered Applications
• Portable and Embedded Computing
• Smart Home and Smart City Applications
• USB Type-A, Type-B and Type-C Connectivity
• Networking
• Automotive
• Internet of Things (IoT)