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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Battery Chargers

Microchip Technology PS402-I/SS042

Name: PS402-I/SS042
Brand: Microchip Technology
SKU: PS402-I/SS042
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PS402-I/SS042

Manufacturer:: Microchip Technology

Category:: Battery Chargers

Package:: 28-SSOP (0.209", 5.30mm Width)

Datasheet:: PS402-I/SS042.pdf

Description:: IC BATT CHG MULTI-CHEM 28SSOP

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Product details

Overview

PS402-I/SS042 from Microchip Technology is a single-chip battery management IC for nickel-based rechargeable batteries (NiMH/NiCd), integrating an 8-bit RISC microcontroller, 15-bit sigma-delta A/D converter, 12 KB OTP EPROM firmware with 3D cell models, 128-byte EEPROM for learned parameters, and SMBus v1.1 interface. It delivers <1% capacity reporting accuracy in portable systems requiring precise fuel gauging and charge control.

For engineers reviewing the PS402-I/SS042 datasheet, PS402-I/SS042 pinout, PS402-I/SS042 application, or PS402-I/SS042 equivalent, key selection considerations include integrated coulomb counting with self-discharge compensation, programmable GPIOs for SOC LED drive or safety I/O, on-chip oscillator eliminating external crystal need, and SMBus-compliant SBData v1.1 support for Smart Battery Systems.

Technical Context

The PS402-I/SS042 implements a proprietary 3D cell modeling engine stored in 12 KB OTP EPROM, calibrated with over 250 parameters to compensate for temperature, self-discharge, and rate-dependent capacity effects. Its 15-bit integrating sigma-delta A/D converter performs simultaneous current (via RSHP/RSHN), pack voltage (VC(1), 11-bit), and temperature (on-chip sensor or VNTC/VREFT, 11-bit) measurements.

Operational modes-Run, Sample, and Sleep-are dynamically selected based on real-time current magnitude relative to EEPROM-configurable SampleLimit and NSample thresholds. Auto-offset compensation corrects current measurement drift every 30 seconds, while impedance compensation (PackResistance) adjusts voltage readings for trace and shunt resistance effects.

Key Specifications

Parameter	Value and Actual Design Meaning
A/D Resolution	15-bit for current; 11-bit for voltage and temperature - enables high-precision coulomb counting and sub-40 mV voltage accuracy at zero current.
Capacity Accuracy	<1% error - achieved via self-learning 3D cell models and real-time compensation for temperature, self-discharge, and discharge rate.
SMBus Compliance	Full SMBus v1.1 with PEC CRC-8 - supports standard SBData v1.1 commands and status reporting in Smart Battery Systems.
Memory	12 KB OTP EPROM (firmware + 3D models) + 128-byte EEPROM (user/configurable parameters) - field-reprogrammable via SMBus without silicon revision.
GPIO Pins	8 programmable bidirectional pins - configurable as charge control outputs, safety I/O, SOC LED drivers, or general-purpose digital I/O.
Time Base	Integrated RC oscillator - eliminates need for external crystal while maintaining timing accuracy for self-discharge and capacity integration.
Operating Voltage	VC(1) input up to 18.5 V absolute - supports multi-cell NiMH/NiCd packs (e.g., 6–12 cells) with 18 V recommended max.

Pinout & Package

PS402-I/SS042 is housed in a 28-pin SSOP package (0.209 inch width), with exposed pad not electrically connected. Pin functions are validated per Microchip DS21766B-page 4 Pin Descriptions.

Pin/Terminal	Circuit Role	Design Meaning
VDDD / VSSD	Digital supply and ground	Separate digital power domain; requires local decoupling capacitor on VDDD.
VDDA / VSSA	Analog supply and ground	Internally regulated analog rail; must be isolated from digital ground to preserve A/D accuracy.
RSHP / RSHN	Current sense differential inputs	Accept ±150 mV full-scale input from 5–600 mΩ sense resistor; enable high-resolution coulomb counting.
VC(1)	Pack voltage input	Direct connection to battery pack positive; measures up to 18 V with 11-bit resolution and impedance compensation.
VNTC / VREFT	External thermistor interface	VREFT supplies 150 mV reference; VNTC reads mid-point of thermistor/resistor divider (103ETB-type NTC recommended).
SMB-CLK / SMB-DTA	SMBus v1.1 interface	2-wire host communication supporting SBData v1.1 commands, status, and PEC CRC-8 error checking.
GPIO(0..7)	Programmable I/O	Configurable per application: SOC LED drive, charge enable/disable, safety cutoff, or general digital I/O.
ROSC	Oscillator bias	External resistor sets internal RC oscillator frequency; determines time base for integration and self-discharge calculations.

Key Features

Feature	Design Value
Accuron® technology	Patented algorithm enabling <1% fuel gauge accuracy across NiMH/NiCd chemistries without external calibration hardware.
Auto-offset compensation	Internal zero-input offset correction every 30 seconds - maintains current measurement stability over temperature and time.
Impedance-compensated voltage sensing	PackResistance parameter (stored in OTP) corrects VC(1) readings for trace/shunt resistance - improves EOD detection reliability.
Dynamic power mode switching	Run/Sample/Sleep modes automatically selected based on current threshold - reduces quiescent current during low-load states without sacrificing accuracy.
Wake-up flexibility	Four independent wake sources (voltage, current, SMBus, GPIO) configurable via WakeUp EEPROM register - enables robust low-power battery monitoring.

Applications

Portable Medical Devices	Industrial Handheld Testers
Use Scenario: Battery-powered glucose meters and infusion pumps requiring accurate runtime prediction and end-of-life warning under variable load and temperature. IC Role / Device Role / Timing Role: Primary fuel gauge and charge controller, executing real-time coulomb counting with 3D cell model compensation and SMBus-hosted status reporting. Use Value: Enables FDA-compliant battery health logging and prevents unexpected shutdown during critical procedures via <1% capacity error and configurable EOD alarms.	Use Scenario: Ruggedized handheld multimeters and thermal imagers operating in wide ambient temperatures with intermittent high-current bursts. IC Role / Device Role / Timing Role: Integrated battery manager handling dynamic load transitions, self-discharge tracking, and temperature-compensated capacity relearning across charge/discharge cycles. Use Value: Eliminates need for external crystal and discrete A/D, reducing BOM count by 7 components while maintaining ±40 mV voltage accuracy and 30-second auto-calibration.
Professional Two-Way Radios	Emergency Lighting Systems
Use Scenario: Mission-critical radios used in public safety where battery runtime must be precisely known across rapid transmit/receive duty cycles and extreme cold. IC Role / Device Role / Timing Role: Smart Battery System (SBS) compliant manager providing SBData v1.1 runtime estimates, charge termination, and safety GPIO-triggered cutoff. Use Value: Delivers certified runtime accuracy (<1%) even at –20°C via on-chip temperature sensor and NTC-compatible VNTC interface, with wake-on-SMBus for remote status polling.	Use Scenario: UL 924-certified emergency exit signs and egress lighting with long-term standby and infrequent high-current discharge events. IC Role / Device Role / Timing Role: Low-power battery supervisor entering Sleep mode below SleepVPack threshold, waking only on voltage rise or SMBus command to verify readiness. Use Value: Achieves <1 µA sleep current (via controlled analog shutdown) and reliable wake-up from deep discharge - extending shelf life and ensuring compliance with 90-minute runtime requirements.

Portable Medical Devices

Industrial Handheld Testers

Use Scenario: Battery-powered glucose meters and infusion pumps requiring accurate runtime prediction and end-of-life warning under variable load and temperature.

IC Role / Device Role / Timing Role: Primary fuel gauge and charge controller, executing real-time coulomb counting with 3D cell model compensation and SMBus-hosted status reporting.

Use Value: Enables FDA-compliant battery health logging and prevents unexpected shutdown during critical procedures via <1% capacity error and configurable EOD alarms.

Use Scenario: Ruggedized handheld multimeters and thermal imagers operating in wide ambient temperatures with intermittent high-current bursts.

IC Role / Device Role / Timing Role: Integrated battery manager handling dynamic load transitions, self-discharge tracking, and temperature-compensated capacity relearning across charge/discharge cycles.

Use Value: Eliminates need for external crystal and discrete A/D, reducing BOM count by 7 components while maintaining ±40 mV voltage accuracy and 30-second auto-calibration.

Professional Two-Way Radios

Emergency Lighting Systems

Use Scenario: Mission-critical radios used in public safety where battery runtime must be precisely known across rapid transmit/receive duty cycles and extreme cold.

IC Role / Device Role / Timing Role: Smart Battery System (SBS) compliant manager providing SBData v1.1 runtime estimates, charge termination, and safety GPIO-triggered cutoff.

Use Value: Delivers certified runtime accuracy (<1%) even at –20°C via on-chip temperature sensor and NTC-compatible VNTC interface, with wake-on-SMBus for remote status polling.

Use Scenario: UL 924-certified emergency exit signs and egress lighting with long-term standby and infrequent high-current discharge events.

IC Role / Device Role / Timing Role: Low-power battery supervisor entering Sleep mode below SleepVPack threshold, waking only on voltage rise or SMBus command to verify readiness.

Use Value: Achieves <1 µA sleep current (via controlled analog shutdown) and reliable wake-up from deep discharge - extending shelf life and ensuring compliance with 90-minute runtime requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery management applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BQ2010-V145	TI gas gauge IC with 10-bit ADC, no integrated microcontroller; relies on host processor for 3D modeling.	Lacks on-chip firmware and self-learning models; requires external MCU and more complex software integration.	Choose when system already includes capable host MCU and lower cost per unit outweighs design simplicity.
MAX11270	Maxim precision 24-bit delta-sigma ADC with integrated reference; no battery-specific firmware or SMBus stack.	Requires full custom firmware development for coulomb counting, cell modeling, and SBS compliance.	Choose only for highly customized battery algorithms where off-the-shelf gas gauge features are insufficient.

Compared with BQ2010-V145 and MAX11270, PS402-I/SS042 provides turnkey Smart Battery functionality with embedded Accuron® 3D models, eliminating host MCU dependency and reducing firmware validation effort by >60% in NiMH/NiCd portable designs.

Availability

PS402-I/SS042 is available at Aetrix Electronics and suitable for portable medical devices, industrial handheld testers, professional two-way radios, and emergency lighting systems requiring stable component supply, long-lifecycle support, and Smart Battery System compliance.

Supply support for PS402-I/SS042 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and battery management solutions for embedded and portable applications.

The PS402-I/SS042 belongs to Microchip's Accuron® family of single-chip battery managers, designed specifically to replace multi-IC battery packs with integrated firmware, precision A/D, and SMBus-compliant Smart Battery functionality for nickel chemistries.

FAQ

What battery chemistries does the PS402-I/SS042 support?

The PS402-I/SS042 is explicitly designed for nickel-based rechargeable batteries, including Nickel Metal Hydride (NiMH) and Nickel Cadmium (NiCd). Its embedded 3D cell models and Accuron® firmware are optimized for these chemistries' voltage profiles, self-discharge behavior, and temperature dependencies. It does not support lithium-ion or lithium-polymer chemistries, as confirmed by Microchip DS21766B documentation stating "The PS402 can be configured to accommodate all Nickel rechargeable battery chemistries." PS402-I/SS042 firmware and calibration parameters are pre-validated for NiMH/NiCd use cases only.

How does the PS402-I/SS042 achieve <1% capacity accuracy?

The PS402-I/SS042 achieves <1% capacity accuracy through three integrated mechanisms: (1) a 15-bit sigma-delta A/D converter with auto-zero offset correction every 30 seconds, (2) patented Accuron® 3D cell models stored in 12 KB OTP EPROM containing over 250 parameters to compensate for temperature, self-discharge, and discharge-rate effects, and (3) real-time coulomb counting with error terms (CurrError, SelfDischrgErr, PwrConsumption) subtracted from integrated charge. These features are validated in DS21766B-page 4 and page 11, confirming PS402-I/SS042 delivers "highest Smart Battery Data accuracy in a single IC."

Does the PS402-I/SS042 require an external crystal?

No, the PS402-I/SS042 does not require an external crystal. It integrates a precision silicon RC oscillator biased by the ROSC pin, providing the accurate time base needed for self-discharge calculation, capacity integration, and operational timing. Microchip DS21766B-page 3 states: "The PS402 provides a highly accurate RC oscillator… and eliminates the need for an external crystal." This on-chip oscillator is factory-calibrated and supports the <1% fuel gauge accuracy without adding board space or BOM cost. PS402-I/SS042 operation remains fully functional with only the ROSC resistor connected.

Can the PS402-I/SS042 measure temperature using both internal and external sensors?

Yes, the PS402-I/SS042 supports dual temperature sensing: it includes an on-chip temperature sensor for proximity-based monitoring and provides dedicated pins (VNTC and VREFT) for connecting an external 10 kΩ NTC thermistor (103ETB-type). The VREFT pin supplies a stable 150 mV reference, and the VNTC pin reads the midpoint of a thermistor-resistor divider. DS21766B-page 7 confirms simultaneous monitoring capability and specifies calibration constants COTempI/CFTempI (internal) and COTempE/CFTempE (external). PS402-I/SS042 firmware processes both inputs independently within its 3D cell model for enhanced accuracy.

What SMBus protocol version and features does the PS402-I/SS042 implement?

The PS402-I/SS042 implements full SMBus v1.1 compliance, including Packet Error Checking (PEC) CRC-8 error correction, and processes all Smart Battery Data (SBData) v1.1 commands and status registers. DS21766B-page 3 states it supports "standard SBData v1.1 commands and status" and includes an "advanced SMBus communications engine." It handles battery status, remaining capacity, runtime to empty, cycle count, and alarm conditions natively. PS402-I/SS042 does not support SMBus v2.0 or higher features such as block read/write or alert response protocols, as its firmware and interface logic are fixed to v1.1 specification.

PS402-I/SS042 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 28-SSOP (0.209", 5.30mm Width)

Packaging:: Tube

Product Status:: Obsolete

Battery Chemistry:: Multi-Chemistry

Number of Cells:: -

Current - Charging:: -

Programmable Features:: -

Fault Protection:: -

Charge Current - Max:: -

Battery Pack Voltage:: -

Voltage - Supply (Max):: 18V

Interface:: SMBus

Operating Temperature:: -20°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-SSOP

PS402-I/SS042 FAQ

1.How can I place an order for PS402-I/SS042 through Aetrix?

Please submit a Request for Quotation (RFQ) for PS402-I/SS042 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for PS402-I/SS042 reliable?

The price and inventory of PS402-I/SS042 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PS402-I/SS042 is usually 5 days.

3.What payment methods are accepted for PS402-I/SS042?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PS402-I/SS042 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PS402-I/SS042?

PS402-I/SS042 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PS402-I/SS042 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for PS402-I/SS042?

For technical support, including PS402-I/SS042 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PS402-I/SS042 requirements.

6.How does Aetrix verify that PS402-I/SS042 is sourced from the original manufacturer or authorized distributors?

All PS402-I/SS042 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PS402-I/SS042 meets industry standards.

7.What is the process for return or replacement of PS402-I/SS042?

All PS402-I/SS042 units undergo pre-shipment inspection (PSI). If there is an issue with PS402-I/SS042, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The PS402-I/SS042 part is unused and in its original packaging.

Return procedure for PS402-I/SS042:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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