Texas Instruments BQ27010DRKR

Overview

BQ27010DRKR from Texas Instruments is a single-cell Li-Ion/Li-Pol battery gas gauge IC with HDQ one-wire interface, <2 µA ship current, ±25 mV voltage reporting accuracy, and automatic coulomb counting with offset calibration. It reports compensated time-to-empty, available capacity, temperature, voltage, and current for portable power management in space-constrained devices.

For engineers reviewing the BQ27010DRKR datasheet, BQ27010DRKR pinout, BQ27010DRKR application, or BQ27010DRKR equivalent, key selection criteria include HDQ communication compatibility, 3 mm × 4 mm QFN package footprint, <1.5 µA hibernate current, internal temperature-compensated oscillator, and EEPROM-programmable coefficients for multi-pack support.

Technical Context

The BQ27010DRKR implements a fully differential Delta-Sigma Coulomb Counter (DSCC) for charge/discharge integration across an external sense resistor, with auto-calibration of internal offset and user-programmable compensation for PCB layout-induced offset. It uses an integrated temperature sensor and ADC for voltage/temperature measurement, both updated every 2.56 s.

Its functional architecture includes RAM-backed registers powered via RBI pin, EEPROM for persistent configuration (e.g., EDV thresholds, DMF, TCOMP), and five low-power modes-Active (<90 µA), Sleep (<2.5 µA), Hibernate (<1.5 µA), Ship (<2 µA), and Data Retention (<20 nA)-enabling operation directly from the battery cell without external regulators.

Key Specifications

Pinout & Package

Package: DRK - 3 mm × 4 mm, 11-pin QFN with exposed thermal pad (bottom view). Pin 11 is VSS ground shield; pin 4 (D/C) must be left floating or tied to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ27010DRKR, BQ27210DRKR offers identical functionality with I²C instead of HDQ - simplifying host integration where I²C is available but requiring hardware changes. BQ27510-G3 delivers superior accuracy and diagnostics at higher cost and firmware complexity, making it suitable for applications where ±1% SOC is mandatory.

Availability

BQ27010DRKR is available at Aetrix Electronics and suitable for PDA power management, smartphone battery monitoring, MP3 player runtime estimation, and digital camera power control requiring stable component supply and long-term production continuity.

Supply support for BQ27010DRKR 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 company specializing in analog, embedded processing, and power management technologies, with leadership in battery management ICs since the early 2000s.

The bqJUNIOR™ series - including BQ27010DRKR - was designed specifically for space-constrained portable applications requiring highly accurate, self-calibrating single-cell Li-Ion/Li-Pol fuel gauging without external components or host intervention.

FAQ

What communication interface does the BQ27010DRKR support?

The BQ27010DRKR supports only the HDQ single-wire serial interface - not I²C or SMBus. Its timing parameters (e.g., t(BR) = 40 µs break recovery, t(DW1) = 32–50 µs) are defined in the SLUS707B datasheet. Host systems must implement the HDQ protocol stack, including break detection and bidirectional bit timing. The BQ27210DRKR variant provides I²C as an alternative.

How does the BQ27010DRKR achieve accurate capacity reporting without user calibration?

The BQ27010DRKR achieves calibration-free operation through its auto-calibrating Delta-Sigma Coulomb Counter (DSCC), which performs periodic 5.12-second internal offset measurements. It also supports EEPROM-programmable external offset compensation for PCB layout effects. Combined with temperature, discharge rate, and aging compensation algorithms, this enables ±1% typical capacity accuracy across 300+ cycles without host calibration routines.

What is the purpose of the RBI pin on the BQ27010DRKR?

The RBI pin on the BQ27010DRKR provides register backup power using an external capacitor. When VCC drops below the POR threshold (~2.0–2.6 V), the internal FET disconnects VCC and the capacitor supplies <20 nA retention current to preserve RAM contents. As long as RBI voltage stays above 1.3 V, critical registers like CAC, LMD, and CYCL remain intact - enabling seamless resume after brief power interruptions.

Can the BQ27010DRKR be used with multi-cell battery packs?

No, the BQ27010DRKR is designed exclusively for single-cell Li-Ion or Li-Pol batteries. Its BAT pin monitors only one cell's voltage, and its coulomb counter is scaled for 2.6–4.5 V operation. For 2-cell or higher configurations, TI recommends the BQ20zxx or BQ34zxx families, which support cell balancing, multi-cell voltage monitoring, and higher voltage ranges.

What are the absolute maximum ratings for the SRP and SRN pins of the BQ27010DRKR?

The SRP and SRN pins of the BQ27010DRKR have an absolute maximum differential input voltage rating of ±100 mV with respect to VSS. Exceeding this range risks damaging the internal Delta-Sigma modulator. The recommended operating range is –100 mV to +100 mV, and the device's coulomb counter resolution (3.57 µVh) assumes proper Kelvin connection to a sense resistor like 0.02 Ω.