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BQ21062 Datasheet(PDF) 26 Page - Texas Instruments |
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BQ21062 Datasheet(HTML) 26 Page - Texas Instruments |
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26 / 69 page  BQ21062 TS VDD NTC RPARALLEL RPARALLEL = RNTC@25C TS IBIAS + _ + _ + _ + _ TS_HOT TS_WARM TS_COOL TS_COLD Disable Charge Disable Charge Reduce ICHARGE Reduce VO_REG Figure 9-8. TS Bias Functional Diagram The BQ21062 supports by default the following thresholds for a 10-KΩ NTC. Table 9-4. TS Thresholds for 10-KΩ Thermistor with 3380 B-Constant THRESHOLD TEMPERATURE (°C) VTS (V) Open -- >0.9 Cold 0 0.585 Cool 10 0.514 Warm 45(1) 0.265 Hot 45(1) 0.265 (1) When VHOT is set to the same or higher voltage level as VWARM, the WARM region is overwitten by HOT region functionality (charge is disabled). 9.3.12 I2C Interface The BQ21062 device uses a fully compliant I2C interface to program and read control parameters, status bits, and so on. I2C is a 2-wire serial interface developed by Philips Semiconductor (see I2C-Bus Specification, Version 2.1, January 2000). The bus consists of a data line (SDA) and a clock line (SCL) with pull-up structures. When the bus is idle, both SDA and SCL lines are pulled high. All the I2C compatible devices connect to the I2C bus through open drain I/O pins, SDA and SCL. A master device, usually a micro-controller or a digital signal processor, controls the bus. The master is responsible for generating the SCL signal and device addresses. The master also generates specific conditions that indicate the START and STOP of data transfer. A slave device receives and/or transmits data on the bus under control of the master device. The BQ21062 works as a slave and supports the following data transfer modes, as defined in the I2C Bus Specification: standard mode (100 kbps) and fast mode (400 kbps). The interface adds flexibility to the battery charge solution, enabling most functions to be programmed to new values depending on the instantaneous application requirements. Register contents remain intact as long as VBAT or VIN voltages remains above their respective UVLO levels. BQ21062 SLUSE42 – JULY 2020 www.ti.com 26 Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated Product Folder Links: BQ21062 |
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