Texas Instruments BQ27421YZFR-G1B Impedance Track™ battery fuel gauge, Li-ion, 1-cell, I²C interface, 9-DSBGA package, Tape & Reel.
| Parameter | Value |
|---|---|
| Series | Impedance Track™ |
| Mounting | Surface Mount |
| Interface | I²C |
| Operating temperature | -40°C~85°C(TA) |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Function | Battery Monitor |
| Case | 9-UFBGA, DSBGA |
| Number of cells | 1 |
| Battery chemistry | Lithium Ion |
The BQ27421YZFR-G1B: Communication is over I²C — the fuel gauge reports voltage, current, temperature, and state-of-charge to the host controller. The part is pre-configured for a single-cell Li-ion pack (4.2 V typical), so no external cell-balancing or protection FETs are integrated; the gauge just monitors.
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