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BQ2052SN-A515G4 Datasheet(PDF) 10 Page - Texas Instruments |
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BQ2052SN-A515G4 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 20 page  Primary Status Flags Register (FLGS1) The FLGS1 register (address = 01h) contains the pri- mary bq2052 flags. The initialized flag (INIT) is asserted to a 1 or 0 when- ever the bq2052 is initialized either by the application of Vcc or by a serial port command. INIT = 1 signifies that the device has been reset with FNAC set to PFC. INIT = 0 signifies that the battery has been reset with FNAC = 0. The INIT location is: FLGS1 Bits 76 5 4 3 2 1 0 INIT - - - - - - - where INIT is: 0 The bq2052 initialized with FNAC = 0. 1 The bq2052 initialized with FNAC = PFC. The CPIN but reflects the state of the CP output. If set, the CP output is high impedance. If cleared, the CP out- put is asserted low. The CP output is an open drain out- put and requires an external pull-up register. The CPIN location is FLGS1 Bits 76543210 - - - CPIN ---- Where CPIN is: 0 CP is low 1 CP is high impedance The bq2052 sets the first end-of-discharge warning flag (EDV1) when the battery voltage VSB is less than the EDV1 threshold VTS. The flag warns the user that the battery is almost empty. The bq2052 modulates the first segment pin, SEG1, at a 4Hz rate if the 4 or 5 seg- ment display mode is enabled and EDV1 is asserted. The EDV1 threshold has a default value of 0.76V but can be adjusted by writing the VTS register . The EDV1 location is FLGS1 Bits 76 5 4 3 2 1 0 - - - - - - EDV1 - Where EDV1 is: 0VSB ≥ VTS 1VSB <VTS The bq2052 sets the final end-of-discharge warning flag (EDVF) when VSB is less than the EDVF threshold. The EDVF threshold is set 100mV below the EDV1 threshold. The EDVF flag is used to warn the system or user that battery power is at a failure condition. The bq2052 turns all segment drivers off upon EDVF detec- tion. The EDVF location is: FLGS1 Bits 76 5 4 3 2 1 0 -- - - - - - EDVF Where EDVF is: 0VSB ≥ (VTS - 100mV) 1VSB < (VTS -100mV) Temperature Register (TEMP) The 8-bit TEMP register (address=02h) contains the battery temperature in degrees C. The bq2052 contains an internal temperature sensor. The temperature is used to set discharge efficiency factors. The temperature register contents are store in 2’s complement form and represent the temperature ± 5°C. Nominal Available Capacity Register (NAC) The NAC register contains the uncompensated remaining capacity of the battery. The bq2052 determines NAC as NAC = FNAC - DCR Battery Identification Register (BATID) The 8-bit BATID register (address=04h) is a general purpose memory register that can be used to uniquely identify a battery pack. The bq2052 maintains the BATID contents as long as VRBI is greater than 2V. The contents of this register have no effect on the operation of the bq2052. Current Scale Registers (VSRL/VSRH) The VSRH high-byte register and the VSRL low-byte register are used to calculate the average signal across the SR and VSS pins. This register pair is updated ev- ery 5.625 seconds. VSRH and VSRL form a 16-bit value representing the average current over this time. The battery pack current can be calculated by: |I(mA)| = (VSRH 256 + VSRL) (R ) S ∗ 10 bq2052 Preliminary Not Recommended For New Designs |
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