| Hypothesis | Likelihood | Reasoning | |------------|------------|------------| | Typographical error | High | Common mistypes: bq4050, bq40z70 (exists as bq40z70-R2? No), bq40350, bq40570. | | Obsolete / pre-release part | Low | No archival evidence in TI’s retired product lists. | | Custom or OEM part number | Medium | Some manufacturers use non-public codes for customer-specific ICs. | | Non-TI product | Low | Prefix “bq” is almost exclusively TI battery management. | | Internal company code | Medium | Could be an internal tracking number (BOM, assembly, or test code). |
: For many Dell batteries using this chip, the discharge current for calibration should be set to approximately 0.5A . Higher currents (like 1.4A) can lead to inaccurate capacity calculations. bq40370
and a 16-bit ADC for voltage and temperature, it calculates the Full Charge Capacity (FCC) Remaining Capacity Communication: The chip communicates with the laptop's motherboard via the | | Custom or OEM part number |
: The chip is usually password-locked (sealed) to prevent tampering. Unsealing is the first step to editing parameters. | : For many Dell batteries using this
The BQ40370 is a sophisticated "gas gauge" that uses a hybrid measurement method known as . It combines Impedance Track (IT) and Compensated End-of-Discharge Voltage (CEDV) techniques to accurately track battery health and capacity.