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BQ2050SN-D119 Datasheet(PDF) 12 Page - List of Unclassifed Manufacturers |
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BQ2050SN-D119 Datasheet(HTML) 12 Page - List of Unclassifed Manufacturers |
12 / 21 page The capacity inaccurate flag (CI) is used to warn the user that the battery has been charged a substantial number of times since LMD has been updated. The CI flag is asserted on the 64th charge after the last LMD update or when the bq2050 is reset. The flag is cleared after an LMD update. The CI values are: Where CI is: 0 When LMD is updated with a valid full dis- charge 1 After the 64th valid charge action with no LMD updates or the bq2050 is reset The valid discharge flag (VDQ) is asserted when the bq2050 is discharged from NAC=LMD. The flag remains set until either LMD is updated or one of three actions that can clear VDQ occurs: n The self-discharge count register (SDCR) has exceeded the maximum acceptable value (4096 counts) for an LMD update. n A valid charge action sustained at VSRO > VSRQ for at least 256 NAC counts. n The EDV1 flag was set at a temperature below 0°C The VDQ values are: Where VDQ is: 0 SDCR ≥ 4096, subsequent valid charge ac- tion detected, or EDV1 is asserted with the temperature less than 0°C 1 On first discharge after NAC = LMD The first end-of-discharge warning flag (EDV1) warns the user that the battery is almost empty. The first segment pin, SEG1, is modulated at a 4Hz rate if the display is enabled once EDV1 is asserted, which should warn the user that loss of battery power is immi- nent. The EDV1 flag is latched until a valid charge has been detected. The EDV1 threshold is externally con- trolled via the VTS register (see Voltage Threshold Reg- ister on this page). The EDV1 values are: Where EDV1 is: 0 Valid charge action detected, VSB ≥ VTS 1VSB <VTS providing that the discharge rate is <2C The final end-of-discharge warning flag (EDVF) flag is used to warn that battery power is at a failure condi- tion. All segment drivers are turned off. The EDVF flag is latched until a valid charge has been detected. The EDVF threshold is set 50mV below the EDV1 threshold. The EDVF values are: Where EDVF is: 0 Valid charge action detected, VSB ≥ (VTS - 50mV) 1VSB < (VTS - 50mV) providing the discharge rate is < 2C Temperature Register (TMP) The read-only TMP register (address=02h) contains the battery temperature. The bq2050 contains an internal temperature sensor. The temperature is used to set charge and discharge ef- ficiency factors as well as to adjust the self-discharge co- efficient. The temperature register contents may be translated as shown in Table 7. The bq2050 calculates the gas gauge bits, GG3-GG0 as a function of CACH and LMD. The results of the calculation give available capacity in 1 16 increments from 0 to 15 16. 12 bq2050 FLGS1 Bits 76 5 4 3 2 1 0 -- - CI - - - - FLGS1 Bits 76 5 4 3 2 1 0 - - - - VDQ - - - FLGS1 Bits 76 5 4 3 2 1 0 - - - - - - EDV1 - FLGS1 Bits 76 5 4 3 2 1 0 -- - - - - - EDVF TMP Temperature Bits 76 5 4 3 2 1 0 TMP4 TMP3 TMP2 TMP1 - - - - |
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