PAC1921 High-Side Power/Current Monitor with Analog Output Features Description Configurable Measurement Type Output: Power, The PAC1921 is a dedicated power-monitoring device Current or Bus Voltage with a configurable analog output that can present power, current or voltage. The PAC1921 is designed for Configurable Voltage Output (3V, 2V, 1.5V, 1V) power measurement and diagnostic systems that can- - All output values also available over SMBus not allow for latency when performing high-speed New Device Topology power management. Measurements are accumulated - Provides integrated average power in large lossless registers, allowing for integration peri- measurement ods of 500 s to 2.9 seconds. The measurement is - Power measurements provided to averaged and presented on the analog output with a microcontroller with ADC inputs full scale range of 3V, 2V, 1.5V or 1.0V. - Unique lossless integrating architecture The PAC1921 has a READ/INT pin for host control of the allows operation at low sense voltages measurement integration period. This pin can be used to - Output voltage proportional to selected synchronize readings of multiple buses between several measurement devices. Alternatively, PAC1921 is able to provide out- puts in a free-running mode. Information is provided on High-Side Current Sensor the OUT pin and is available via SMBus if desired. Data - 100 mV full-scale current sense voltage range sampling and output attributes, such as the internal ADC - Second-order delta-sigma ADC with 11-bit or resolution (11-bit or 14-bit) and sample rate, are config- 14-bit resolution urable. The SMBus interface has more selections for - Selectable current binary gain ranges: 1x user-configurable options. through 128x The PAC1921 is a 1% accurate power measurement 1% Power Measurement Accuracy device that measures and cancels the zero offset from Auto-Zero Offset the input pins. The PAC1921 was designed to monitor Auto Sleep State power rails from 0-32V with a full-scale capability of - Automatically shifts to low-power state 100 mV across the sense resistor. No input filters are (3.5 A) required for this device. Power Supply Package Types -V = 3.3V nominal (operational range 3.0V DD to 5.5V) PAC1921 3x3 VDFN* Bus Range 0V to 32V No Input Filters Required V 1 10 SM CLK DD Available in a 10-pin 3 mm x 3 mm VDFN RoHS SENSE + 2 9 SM DATA Compliant Package EP SENSE - READ/INT 3 8 11 Applications OUT RESERVED 4 7 GND 5 6 ADDR SEL Diagnostic Equipment Servers *Includes Exposed Thermal Pad (EP), see Table 3-1 Power Supplies Industrial and Power Management Systems Notebook and Desktop Computers 2012-2019 Microchip Technology Inc. DS20005293E-page 1PAC1921 Device Block Diagram V GND DD 10-bit Resistor OUT ADDR SEL DAC Decoder 11-bit or READ/INT 14-bit V Buffer/ SENSE+ ADC Divider SM CLK and Digital Control MUX SM DATA Diff Current SENSE- Amplifier RESERVED DS20005293E-page 2 2012-2019 Microchip Technology Inc.