Mixed signal microchip PAC1761 series

programmablepower measurementanalog

Product Overview
The PAC1761 is a single-channel 65 V full-scale power, voltage and current monitor integrating a bus voltage monitor and a current-sense amplifier feeding a single 12-bit ADC. It supports high-side and low-side current sensing, on-chip power calculation and a 32-bit accumulator for long-term energy monitoring with integration periods up to one year or longer. Measurement results and status registers are available to a host via SMBus/I2C and the device provides alert outputs for over/undervoltage, overcurrent or overpower conditions.

Key Features

• Single-channel power, voltage and current monitoring (high-side or low-side)
• Single 12-bit ADC for sense current and voltage
• VBUS full-scale range 0–65 V
• Sense range 100 mV FS (configurable to 50 mV) via external shunt
• On-chip 32-bit accumulated power for energy measurement; optional coulomb-counting (VSENSE accumulation)
• Programmable sampling rates: 8, 64, 256, 1024, 4096, 8192
• Real-time auto-calibration to minimize offset errors
• Approximately 1% power measurement accuracy across wide dynamic range

Interfaces and Operation

• Supply voltage: 2.7 V to 5.5 V (I/O and SMBus/I2C tolerant to 1.62 V–5.5 V)
• I2C/SMBus compatible interface (I2C Fast Mode Plus 1 Mbps); SMBus 3.1 and High Speed Mode (3.4 Mbps) supported
• Up to two alert outputs for fault signaling (over/undervoltage, overcurrent, overpower)
• Sampling and integration periods configurable via SMBus/I2C; one-shot and other controls supported

On-chip measurement and control

• Built-in adjustable averaging for low-noise, high-resolution results
• Registers store bus voltage, sense resistor voltage and accumulated proportional power for host retrieval
• Configurable sampling modes, one-shot measurements and programmable energy integration via SMBus/I2C

Documents
Datasheet and software/firmware resources available (PDF datasheet and related libraries/firmware).

Catalog parts / Representative variants (table)
Part Number | Lead Count (Pins) | Package Type | Temperature Range | Packing | Representative Price
PAC1761T-2E/9QVAO | 10 | VDFN | -40°C to +125°C | T/R | $0.64
PAC1761T-1E/3PVAO | 8 | VDFN | -40°C to +125°C | T/R | $0.62
PAC1761T-3E/E3VAO | 10 | MSOP | -40°C to +125°C | T/R | $0.61

Technical specifications

• Model: PAC1761
• Single-channel power monitor with accumulator
• VBUS measurement range: 0–65 V FS
• Single 12-bit ADC for current and voltage sensing
• Sensitivity: 100 mV FS (configurable to 50 mV) via external sense resistor
• Power measurement accuracy: ~1% across wide dynamic range
• On-chip 32-bit accumulator for energy; coulomb-counting option
• Sampling rates: 8, 64, 256, 1024, 4096, 8192
• Real-time offset auto-calibration
• Supply: 2.7 V to 5.5 V; I/O and SMBus/I2C tolerant 1.62 V–5.5 V
• Interfaces: I2C/SMBus (SMBus 3.1), I2C Fast Mode Plus (1 Mbps), High Speed Mode (3.4 Mbps)
• Alerts: up to two pins for over/under-voltage, overcurrent, overpower
• No external input filters required; on-chip averaging
• Supported for high-side and low-side sensing
• Registers accessible by host for bus voltage, VSENSE and accumulated power
• Package examples: VDFN, MSOP (8 and 10 pins)
• Operating temperature: -40°C to +125°C
• Production status: In Production
• Datasheet: DS20007174 (PAC1761 Single-Channel Power Monitor with Accumulator, 65V Full Scale Range)