Part Number: BQ25618
Other Parts Discussed in Thread: BQ25619, BQ25619E, BQ25616, , , BQ25611D
The JEITA guideline was released on April 20, 2007 to improve the safety of charging Li-ion batteries. The BQ25618, BQ25618E, BQ25619, BQ25619E, BQ25611D, BQ25616, and BQ25616J chargers have a TS pin, which is used with a thermistor and resistor divider in order to monitor the battery temperature. If the TS pin is outside of the T1-T5 range as specified in the datasheet charging will be suspended until the TS voltage returns to correct range. Between T2-T3, full programmed charge current and charge voltage are applied. Please note in this FAQ that the BQ25618, BQ25618E, BQ25619, BQ25619E, and BQ25611D will be referred to as “I2C Chargers.” Please note that the BQ25616 just has a simple Hot/Cold Profile and only allows charging between T1-T3.
For all I2C Chargers, the charge current is configurable between T1-T2. The options for the charge current are 0%, 20%, 50%, and 100% of the programmed charge current and is set by JEITA_COOL_ISET. For the BQ25616J the charge current is 20% of the programmed value between T1-T2. In addition, when the I2C Chargers are between T3-T5 the options for the charge current for the I2C Chargers are 0%, 20%, 50%, and 100% of the programmed charge current and is set by JEITA_WARM_ISET. For the BQ25616J there is full charge current between T2-T5.
For all I2C Chargers, the charge voltage is configurable between T3-T5. The options for the charge voltage are 4.1 V charge voltage regulation or the programmed regulation voltage and is set by JEITA_VSET. For the BQ25616J the charge voltage is fixed at 4.1 V between T3-T5. For both the I2C Chargers there is full charge voltage between T1-T3.
See below for I2C Charger JEITA thresholds.
See below for JEITA thresholds for BQ25616J.
See below for Hot/Cold Thresholds for BQ25616.
