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BQ26200PWR Datasheet(PDF) 7 Page - Texas Instruments |
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BQ26200PWR Datasheet(HTML) 7 Page - Texas Instruments |
7 / 25 page bq26200 SLUS509A − DECEMBER 2001 − REVISED NOVEMBER 2004 7 www.ti.com APPLICATION INFORMATION 1 2 3 4 8 7 6 5 REG VCC VSS HDQ STAT SRP SRN OSC bq26200PW C3 0.1 µ F VCC R6 100 Ω R5 100 Ω BAT+ DATA D2 5.6 V R4 100 k Ω C2 0.1 µ F R3 100 k Ω R1 0.02 Ω R2 100 k Ω STAT BAT− PACK− C1 0.1 µF UDG−01131 Figure 3. Typical Single-Cell Li-Ion/Li-Pol Application Diagram functional description The bq26200 measures the voltage drop across a low-value series-current sense-resistor between the SRP and SRN pins using a voltage to frequency converter. All data is placed into various internal counter and timer registers. Using information from the bq26200, the system host can determine the battery state-of-charge, estimate self-discharge, and calculate the average charge and discharge currents. During pack storage periods, the use of an internal temperature sensor doubles the self-discharge count rate every 10 °C above 25 °C.The VFC offset is automatically compensated for in the charge and discharge counter registers. Access to the registers and control of the bq26200 is accomplished via a single wire interface through a register mapped command protocol that includes placing the device in the low-power mode, hardware-register reset, programming flash from RAM, and transferring flash data to RAM. The bq26200 can operate directly from a single Li-Ion cell or three or four nickel-chemistry cells for as long as VCC is between 2.8 V and 5.5 V. To reduce cost in multicell applications, power to the bq26200 may be regulated using a low-cost external FET in conjunction with the REG pin. REG output The bq26200 can operate directly from three or four nickel-chemistry cells or a single Li-Ion cell as long as VCC is between 2.8 V and 5.5 V. To facilitate the power supply requirements of the bq26200, the REG output is used in conjunction with an external low-threshold n-JFET when regulation from a higher source potential is required. The REG output remains active in sleep mode. For applications that do not need the REG output, operating current can be reduced by turning off the operational amplifier with the DISREG bit in the MODE/WOE register. For more details, refer to the MODE/WOE register section |
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