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

Texas Instruments BQ34Z100PW

Name: BQ34Z100PW
Brand: Texas Instruments
SKU: BQ34Z100PW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BQ34Z100PW

Manufacturer:: Texas Instruments

Category:: Battery Management

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: BQ34Z100PW.pdf

Description:: IC BATT MON MULTI-CHEM 14TSSOP

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Product details

Overview

BQ34Z100 from Texas Instruments is a standalone wide-range fuel gauge IC for Li-ion and LiFePO₄ battery packs, delivering ±1% state-of-charge accuracy via Impedance Track™ algorithm across 3 V–65 V systems. It integrates a 14-bit coulomb counter, dual-oscillator timing (32.768 kHz + 8.389 MHz), SHA-1/HMAC authentication, and supports >65 Ah capacity with >32 A charge/discharge current monitoring in medical instrumentation and UPS applications.

For engineers reviewing the BQ34Z100 datasheet, BQ34Z100 pinout, BQ34Z100 application, or BQ34Z100 equivalent, this page delivers verified technical context, real-world power mode behavior (NORMAL/SLEEP/FULL SLEEP), I²C/HDQ interface timing constraints, thermistor-based temperature compensation, and LED display control architecture - all critical for battery management system integration and firmware validation.

Technical Context

The BQ34Z100 operates as a self-contained gas gauge with no host dependency for impedance modeling: it autonomously executes Impedance Track™ using voltage, current, and temperature inputs to compute remaining capacity, full charge capacity, and aging-compensated Qmax. Its dual ADC subsystem includes a 14-bit integrating coulomb counter (SRP/SRN) with ±10 µV offset and a 14-bit auxiliary ADC (TS/BAT) with 8 MΩ input impedance for thermistor sensing.

Timing is governed by two independent oscillators: a low-frequency 32.768 kHz crystal oscillator (±4% error over –40°C to 85°C) for RTC and sleep-state timing, and a high-frequency 8.389 MHz internal oscillator (±4.5% error) for ADC conversion and flash programming. Communication occurs via open-drain I²C (400 kHz compliant) or single-wire HDQ (205 µs nominal cycle time), both supporting secure SHA-1/HMAC challenge-response authentication.

Key Specifications

Parameter	Value and Actual Design Meaning
Voltage Range	Supports 3 V–65 V battery packs via external voltage translation circuit; BAT pin accepts up to 5.5 V after translation.
Coulomb Counter	14-bit integrating ADC on SRP/SRN pins; ±0.125 V input range, 1 s conversion time, ±10 µV offset - enables precise high-current shunt monitoring.
Power Modes	NORMAL: <140 µA avg; SLEEP: <64 µA avg; FULL SLEEP: <19 µA avg - automatic transition reduces pack quiescent drain during idle.
Communication	I²C slave (400 kHz, open-drain SDA/SCL); HDQ single-wire (205 µs cycle time); both support SHA-1/HMAC authentication for secure pack identification.
Temperature Sensing	External NTC thermistor interface (P6/TS pin, 103AT-type compatible); internal sensor option with –2 mV/°C gain - critical for aging and self-discharge compensation.
Data Retention	10-year flash memory retention; 20,000 write cycles for 32-byte user-programmable data space - ensures long-term calibration and chemistry configuration stability.
LED Control	Direct drive for 1–4 LEDs (P1–P4 pins); expandable to 5+ LEDs via SN74HC164 shift register - provides SOC visualization without host MCU intervention.

Pinout & Package

Package: 14-pin TSSOP (5.00 mm × 4.40 mm body size), surface-mount, RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
P1	LED 1 output / Not used	Open-drain driver for first LED; requires external N-FET in series for single-LED mode - enables direct visual SOC indication.
VEN	Voltage translation enable	Active-high signal controlling external voltage divider; reduces divider power consumption (~45 µA) when inactive - key for ultra-low-quiescent designs.
P2	LED 2 output / Not used	Open-drain driver for second LED; tied to VSS if unused - supports 2-LED SOC bar display without external logic.
BAT	Translated battery voltage input	Accepts scaled-down battery voltage (≤5.5 V) from external resistor network - isolates gauge from high-voltage battery rails.
CE	Chip enable	Drives internal LDO off when low; disconnects REG25 from REGIN - enables system-level power gating of entire gauge.
REGIN	LDO input supply	Input for integrated 2.5 V regulator; requires 0.1 µF ceramic decoupling to VSS - powers internal circuitry from 2.7–4.5 V source.
REG25	2.5 V LDO output	Stable 2.5 V supply (2.3–2.7 V over temp); requires 1 µF ceramic decoupling - powers analog blocks and ADC references.
VSS	Device ground	Primary reference for all analog and digital circuits; must be low-impedance connection to PCB ground plane - critical for coulomb counter accuracy.
SRP	Coulomb counter high-side sense	Analog input connected to shunt resistor near BAT–; measures differential voltage with SRN - defines current direction and magnitude.
SRN	Coulomb counter low-side sense	Analog input connected to shunt resistor near PACK–; completes differential measurement with SRP - enables bidirectional current tracking.
P6/TS	Thermistor voltage sense	ADC input for 103AT-type NTC; reads thermistor divider voltage (0.05–1 V range) - provides temperature input for Impedance Track™ aging model.
P5/HDQ	HDQ serial communication	Open-drain bidirectional single-wire interface; requires pull-up to VCC - enables minimal-pin-count host communication for authentication and telemetry.
P4/SCL	I²C clock / LED 4	I²C clock input (10 kΩ pull-up required); doubles as fourth LED driver in 4-LED mode - multiplexes interface and display functions.
P3/SDA	I²C data / LED 3	Open-drain I²C data line (10 kΩ pull-up required); doubles as third LED driver - shares physical pin between host command channel and status indicator.

Key Features

Feature	Design Value
Impedance Track™ Algorithm	Patented real-time battery modeling that compensates for aging and self-discharge using voltage, current, and temperature - achieves ±1% SOC accuracy without periodic full-charge recalibration.
Dual Oscillator Architecture	Independent 32.768 kHz LF oscillator (for sleep timing) and 8.389 MHz HF oscillator (for ADC/conversion) - eliminates need for external crystals while maintaining precision timing across operating modes.
Secure Authentication	SHA-1/HMAC engine with scratch-pad challenge-response buffer - prevents counterfeit battery packs by validating cryptographic keys during host interrogation.
Flexible LED Interface	Four dedicated open-drain LED drivers (P1–P4) plus port-expander support for ≥5 LEDs - enables direct SOC visualization without MCU firmware overhead or GPIO allocation.
Ultra-Low-Power Operation	Three autonomous power states (NORMAL/SLEEP/FULL SLEEP) with sub-20 µA FULL SLEEP current - extends battery pack shelf life and reduces parasitic drain in always-connected systems.
Wide Chemistry Support	Configurable for Li-ion and LiFePO₄ chemistries via flash-programmable parameters - allows single BOM to serve multiple battery platforms without hardware change.

Applications

Medical Instrumentation	Uninterruptible Power Supplies (UPS)
Use Scenario: Portable defibrillators and infusion pumps requiring accurate runtime prediction under variable load and temperature. IC Role / Device Role / Timing Role: Standalone fuel gauge performing autonomous Impedance Track™ modeling; uses internal 32.768 kHz oscillator for sleep-state timing and 8.389 MHz oscillator for coulomb counting. Use Value: ±1% SOC accuracy ensures reliable low-battery warnings and prevents unexpected shutdown during critical procedures - directly impacts patient safety compliance.	Use Scenario: Rack-mounted UPS systems monitoring multi-cell LiFePO₄ backup batteries with >65 Ah capacity and >32 A discharge capability. IC Role / Device Role / Timing Role: Primary gas gauge interfacing via I²C to system controller; leverages SRP/SRN differential sensing for high-current shunt monitoring. Use Value: Supports >65 Ah capacity and >32 A currents without external amplification - eliminates need for signal-conditioning circuitry and reduces BOM cost and board area.
Light Electric Vehicles	Power Tools
Use Scenario: E-bikes and scooters with 36–52 V Li-ion packs requiring robust SOC estimation across wide temperature ranges (–40°C to 85°C). IC Role / Device Role / Timing Role: Battery management subsystem component using external 103AT thermistor (P6/TS) and dual-oscillator timing for aging compensation. Use Value: Aging and self-discharge compensation maintains SOC accuracy over 500+ charge cycles - extends usable battery life and improves user confidence in range estimates.	Use Scenario: Cordless drills and impact drivers with high-pulse discharge profiles (>32 A peak) and aggressive thermal cycling. IC Role / Device Role / Timing Role: Coulomb counter and voltage monitor feeding real-time data to tool MCU; uses P5/HDQ for low-pin-count communication during runtime. Use Value: HDQ interface enables secure authentication and telemetry with only one MCU GPIO - simplifies mechanical design and reduces connector pin count in compact tool housings.

Medical Instrumentation

Uninterruptible Power Supplies (UPS)

Use Scenario: Portable defibrillators and infusion pumps requiring accurate runtime prediction under variable load and temperature.

IC Role / Device Role / Timing Role: Standalone fuel gauge performing autonomous Impedance Track™ modeling; uses internal 32.768 kHz oscillator for sleep-state timing and 8.389 MHz oscillator for coulomb counting.

Use Value: ±1% SOC accuracy ensures reliable low-battery warnings and prevents unexpected shutdown during critical procedures - directly impacts patient safety compliance.

Use Scenario: Rack-mounted UPS systems monitoring multi-cell LiFePO₄ backup batteries with >65 Ah capacity and >32 A discharge capability.

IC Role / Device Role / Timing Role: Primary gas gauge interfacing via I²C to system controller; leverages SRP/SRN differential sensing for high-current shunt monitoring.

Use Value: Supports >65 Ah capacity and >32 A currents without external amplification - eliminates need for signal-conditioning circuitry and reduces BOM cost and board area.

Light Electric Vehicles

Power Tools

Use Scenario: E-bikes and scooters with 36–52 V Li-ion packs requiring robust SOC estimation across wide temperature ranges (–40°C to 85°C).

IC Role / Device Role / Timing Role: Battery management subsystem component using external 103AT thermistor (P6/TS) and dual-oscillator timing for aging compensation.

Use Value: Aging and self-discharge compensation maintains SOC accuracy over 500+ charge cycles - extends usable battery life and improves user confidence in range estimates.

Use Scenario: Cordless drills and impact drivers with high-pulse discharge profiles (>32 A peak) and aggressive thermal cycling.

IC Role / Device Role / Timing Role: Coulomb counter and voltage monitor feeding real-time data to tool MCU; uses P5/HDQ for low-pin-count communication during runtime.

Use Value: HDQ interface enables secure authentication and telemetry with only one MCU GPIO - simplifies mechanical design and reduces connector pin count in compact tool housings.

Equivalent & Alternatives

The following parts are listed as comparable options for similar fuel gauge applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BQ40Z50-R1	Integrated protection FET drivers, 5-V LDO, and enhanced safety features (OV/UV/OT/UT); requires external sense resistor but lacks HDQ interface.	Targeted at protected battery packs needing integrated safety logic; not suitable for pure fuel gauging in unmodified packs.	Select BQ40Z50-R1 when cell-level protection and FET control are required alongside gauging; BQ34Z100 remains optimal for cost-sensitive, protection-free designs.
MAX17055	ModelGauge m5 algorithm (no external thermistor required), 1.8-V operation, smaller 12-pin WLP package; supports only up to 32 V and 16 A.	Better suited for space-constrained consumer electronics (e.g., tablets) with lower voltage/current requirements.	Choose MAX17055 for sub-32 V, <16 A portable devices where footprint and ultra-low voltage operation are critical; BQ34Z100 excels in industrial/high-voltage applications.

Compared with BQ40Z50-R1 and MAX17055, the BQ34Z100 uniquely balances wide voltage range (3–65 V), high-current support (>32 A), HDQ/I²C dual-interface flexibility, and autonomous Impedance Track™ operation - making it the only choice for high-voltage industrial battery packs requiring field-upgradable authentication and LED-based SOC display without added protection circuitry.

Availability

BQ34Z100 is available at Aetrix Electronics and suitable for medical instrumentation, uninterruptible power supplies (UPS), light electric vehicles, and power tools requiring stable component supply, long-term flash data retention, and secure battery authentication.

Supply support for BQ34Z100 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of leadership in battery management innovation.

The BQ34Z100 belongs to TI's Impedance Track™ fuel gauge product line, engineered specifically for high-accuracy, chemistry-agnostic battery monitoring in industrial, medical, and transportation applications where long-term reliability and autonomous operation are mandatory.

FAQ

What battery chemistries does the BQ34Z100 support?

The BQ34Z100 supports Li-ion and LiFePO₄ chemistries through flash-programmable parameters and adaptive Impedance Track™ modeling. It does not support NiMH, lead-acid, or alkaline chemistries. Configuration is performed during pack manufacturing using TI's bqStudio software, and the BQ34Z100 retains chemistry-specific calibration data in its 10-year-retention flash memory - ensuring consistent performance across the battery's lifetime.

How does the BQ34Z100 achieve ±1% state-of-charge accuracy?

The BQ34Z100 achieves ±1% SOC accuracy using Texas Instruments' proprietary Impedance Track™ algorithm, which continuously models battery impedance based on real-time voltage, current (via SRP/SRN shunt sensing), and temperature (via P6/TS thermistor) measurements. This algorithm autonomously compensates for aging and self-discharge without requiring full-charge recalibration - a capability validated across 3 V–65 V systems and >65 Ah capacities in the official BQ34Z100 datasheet.

What are the power consumption characteristics of the BQ34Z100 in different operating modes?

The BQ34Z100 offers three autonomous power modes: NORMAL mode draws <140 µA average current, SLEEP mode draws <64 µA, and FULL SLEEP draws <19 µA - all measured under typical battery pack operating conditions. Mode transitions occur automatically based on activity; for example, communication via I²C or HDQ forces exit from FULL SLEEP. These values are specified in Section 6.3 of the BQ34Z100 datasheet and confirmed across –40°C to 85°C.

Can the BQ34Z100 interface with a host microcontroller using both I²C and HDQ simultaneously?

No, the BQ34Z100 does not support simultaneous I²C and HDQ communication; it operates in either I²C slave mode (using P3/SDA and P4/SCL) or HDQ mode (using P5/HDQ) at any given time. The interface is selected during initialization via configuration registers. Both protocols share the same command set (Standard and Extended Data Commands) and deliver identical telemetry - allowing designers to choose based on pin count, noise immunity, or existing host peripheral availability.

Does the BQ34Z100 require an external crystal oscillator?

No, the BQ34Z100 does not require an external crystal oscillator. It integrates two independent on-die oscillators: a 32.768 kHz low-frequency oscillator for sleep-state timing and RTC functions, and an 8.389 MHz high-frequency oscillator for ADC conversions and flash operations. Both are factory-trimmed and specified across –40°C to 85°C (±4% and ±4.5% error respectively), eliminating BOM cost and layout complexity associated with external crystals.

BQ34Z100PW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: Impedance Track™

Package/Case:: 14-TSSOP (0.173", 4.40mm Width)

Packaging:: Bulk

Product Status:: Active

Function:: Battery Monitor

Battery Chemistry:: Multi-Chemistry

Number of Cells:: -

Fault Protection:: -

Interface:: HDQ, I2C

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-TSSOP

BQ34Z100PW FAQ

1.How can I place an order for BQ34Z100PW through Aetrix?

Please submit a Request for Quotation (RFQ) for BQ34Z100PW 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 BQ34Z100PW reliable?

The price and inventory of BQ34Z100PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ34Z100PW is usually 5 days.

3.What payment methods are accepted for BQ34Z100PW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ34Z100PW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BQ34Z100PW?

BQ34Z100PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BQ34Z100PW 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 BQ34Z100PW?

For technical support, including BQ34Z100PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ34Z100PW requirements.

6.How does Aetrix verify that BQ34Z100PW is sourced from the original manufacturer or authorized distributors?

All BQ34Z100PW 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 BQ34Z100PW meets industry standards.

7.What is the process for return or replacement of BQ34Z100PW?

All BQ34Z100PW units undergo pre-shipment inspection (PSI). If there is an issue with BQ34Z100PW, 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 BQ34Z100PW part is unused and in its original packaging.

Return procedure for BQ34Z100PW:

1.Submit a request within 90 days.

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

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