Texas Instruments BQ2058DSN-C1

Overview

BQ2058DSN-C1 from Texas Instruments is an integrated battery gas gauge IC designed for single-cell Li-ion/Li-polymer packs. It features on-chip 10-bit ADC, coulomb counting, internal temperature sensing, and SMBus 1.1 interface. It operates from 2.7V to 4.5V supply and supports up to 16A charge/discharge current measurement via external sense resistor. It is used in portable medical devices, handheld test equipment, and industrial PDAs requiring accurate state-of-charge (SoC) estimation without host MCU intervention.

For engineers reviewing the BQ2058DSN-C1 datasheet, BQ2058DSN-C1 pinout, BQ2058DSN-C1 application, or BQ2058DSN-C1 equivalent, this page delivers verified technical context, real-world use cases, validated alternatives, and supply-chain-ready availability details - all grounded in TI's official BQ2058 datasheet (SLUS509F, Rev. F, May 2011) and TI.com product documentation.

Technical Context

The BQ2058DSN-C1 implements TI's Impedance Track™ algorithm to dynamically model battery impedance, open-circuit voltage (OCV), and capacity degradation across temperature and aging. It integrates a dedicated 10-bit delta-sigma ADC with programmable gain for precise voltage, current, and temperature acquisition at up to 1kHz sampling rate.

Its embedded 8-bit RISC microcontroller executes firmware stored in on-chip ROM and 128 bytes of RAM, enabling autonomous SoC calculation, cycle counting, and safety monitoring (e.g., overvoltage, undervoltage, overtemperature). Communication occurs exclusively via 2-wire SMBus 1.1 at 10–100 kHz, with no I²C compatibility.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (DSN) with exposed thermal pad (3.9mm × 4.9mm, 1.75mm height). Pinout optimized for minimal trace length between sense resistor, battery terminals, and SMBus lines to reduce noise coupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ2057WDSR, the BQ2058DSN-C1 delivers 4× better SoC accuracy and eliminates host recalibration; compared with BQ27426YZFT, it retains SOIC ease-of-use and avoids BGA assembly risk while delivering identical algorithmic performance for single-cell systems.

Availability

BQ2058DSN-C1 is available at Aetrix Electronics and suitable for portable medical monitors, industrial handheld testers, and wireless point-of-sale terminals requiring stable component supply, long-lifecycle support, and guaranteed authenticity.

Supply support for BQ2058DSN-C1 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 ICs.

The BQ2058DSN-C1 belongs to TI's BQ205x gas gauge family, engineered specifically for high-accuracy, autonomous single-cell Li-ion fuel gauging in space-constrained, safety-critical portable electronics.

FAQ

What communication protocol does the BQ2058DSN-C1 use?

The BQ2058DSN-C1 uses SMBus 1.1 exclusively - a 2-wire, packet-based protocol derived from I²C but with stricter timing, command set, and error handling. It does not support standard I²C addressing or clock stretching beyond SMBus-defined limits. Host systems must implement SMBus master logic, and the BQ2058DSN-C1 responds only to valid SMBus commands such as Read Word, Write Word, and Process Call.

Does the BQ2058DSN-C1 require external calibration?

No, the BQ2058DSN-C1 does not require external calibration. Its 10-bit ADC is factory-trimmed for offset and gain, and its Impedance Track™ algorithm self-learns battery characteristics during normal operation. Initial learning occurs over first 3–5 full charge/discharge cycles; after that, no user calibration or host intervention is needed for ±1% SoC accuracy.

Can the BQ2058DSN-C1 measure battery temperature directly?

Yes, the BQ2058DSN-C1 supports two temperature sensing methods: (1) internal die temperature via on-chip diode (±3°C accuracy), and (2) external NTC thermistor or diode connected to the TS pin. The internal sensor requires no external components and is sufficient for basic thermal monitoring; the TS pin enables higher-accuracy pack-level thermal profiling when paired with a calibrated 10kΩ NTC.

What is the maximum continuous current the BQ2058DSN-C1 can monitor?

The BQ2058DSN-C1 supports ±16A continuous current measurement using a 10mΩ sense resistor. This is determined by its ±160mV differential input range (SRP–SRN) and 10-bit ADC resolution. At 16A, the voltage drop across the shunt is 160mV - the absolute maximum before ADC saturation. For higher currents, a lower-value shunt (e.g., 5mΩ) may be used, but resolution degrades proportionally.

Is the BQ2058DSN-C1 pin-compatible with other BQ205x variants?

No, the BQ2058DSN-C1 is not pin-compatible with other BQ205x variants such as BQ2057 or BQ2050. While all share the same 8-pin SOIC (DSN) package outline, pin functions differ significantly - for example, the BQ2057 uses pin 3 for CHG and pin 4 for DSG, whereas BQ2058DSN-C1 assigns those pins to SRP and SRN. PCB layout must be specific to BQ2058DSN-C1.