Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Battery Range | 3 V to 65 V battery systems with external voltage translation |
| Gauging Method | Impedance Track technology |
| Chemistry | Li-Ion / Li-Polymer and LiFePO4 |
| Capacity / Current Scale | Supports capacities above 65 Ah and charge/discharge currents above 32 A |
| Host Interface | I²C or HDQ single-wire |
| User Interface | Direct 1- or 4-LED support; additional LEDs via port expander |
| Security | SHA-1/HMAC authentication support |
| Exact Package / Packing | TSSOP (PW), 14 pins; 2000-piece large tape and reel |
Product Overview
BQ34Z100PWR-G1 is a wide-range battery fuel gauge designed to work across battery systems from approximately 3 V to 65 V without tying the gauge to one fixed series-cell count. It uses TI’s Impedance Track algorithm and an external voltage-translation network so one gauge architecture can be adapted to low- and high-voltage packs.
The gauge itself does not directly accept the full 65 V pack voltage at a measurement pin. High-voltage operation depends on the external translation circuit and its control, so divider accuracy, leakage, dynamic behavior, and power consumption become part of fuel-gauge accuracy. The 3 V to 65 V figure therefore describes the supported battery-system architecture.
TI also positions BQ34Z100 for capacities above 65 Ah and charge/discharge currents above 32 A. At those scales, shunt selection, Kelvin routing and calibration become especially important because small current-measurement errors can accumulate into meaningful capacity error over long charge/discharge periods.
For related devices, see HKEQGOO’s Battery Management category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | BQ34Z100PWR-G1 |
| Fuel-Gauge Algorithm | Impedance Track |
| Supported Battery System Voltage | 3 V to 65 V with external voltage translation |
| Supported Chemistry | Li-Ion / Li-Polymer, LiFePO4 |
| Capacity Capability | Above 65 Ah stated feature |
| Current Capability | Above 32 A charge/discharge stated feature |
| Communication | I²C and HDQ |
| Temperature | External NTC thermistor support |
| Authentication | SHA-1 / HMAC support |
| LED Functions | One or four LEDs directly; more with external port expander |
| Normal Current | Less than 140 µA average stated feature |
| Sleep Current | Less than 64 µA average stated feature |
| Full-Sleep Current | Less than 19 µA average stated feature |
| Package | TSSOP (PW), 14 pins |
| Manufacturer Status | Active / Production |
| Part Marking | 34Z100 |
Functional Highlights
The external voltage-translation circuit is part of gauging accuracy
BQ34Z100 is intentionally independent of fixed series-cell count. A high-voltage pack is scaled into the gauge measurement range by external circuitry. Resistor tolerance, leakage, grounding and translation-control behavior therefore influence the voltage data used by the algorithm.
For a high-series-count pack, validating the translation path across temperature and pack voltage is as important as choosing the gauge itself.
Large-capacity support increases the importance of current calibration
At high current, shunt resistance, Kelvin routing, board copper and calibration all affect measured ampere-hours. A small offset that is insignificant in a low-current product can create a larger accumulated capacity error in a long-duration high-capacity system.
I²C and HDQ provide different host-integration options
The gauge supports both a two-wire I²C interface and TI’s single-wire HDQ interface. Interface choice affects connector/pin count, host firmware, timing and service tooling and should be selected with the pack communication architecture.
Design Considerations
- Design the pack-voltage translation network as a measurement circuit. Accuracy, leakage and temperature coefficient affect gauge input data.
- Characterize the actual cell chemistry with the intended Impedance Track configuration. The algorithm adapts for aging but still depends on appropriate chemistry/profile data.
- Scale the current-sense path for the real pack current. High-current support does not remove shunt-loss and measurement-resolution tradeoffs.
- Choose I²C or HDQ according to the host/pack interface. Firmware and connector requirements differ.
- Account for sleep strategy in stored systems. NORMAL, SLEEP and FULL SLEEP currents differ materially over long storage periods.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists BQ34Z100PWR-G1 in the 14-pin TSSOP PW package with a 2000-piece large tape-and-reel carrier, Level-2-260C-1 YEAR MSL classification, an operating-temperature listing of −40°C to +85°C, and part marking 34Z100. The PWR-G1 suffix is part of the exact orderable identity and should be retained in RFQs and purchasing records.
Related Engineering Resources
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