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BQ2012 Datasheet(PDF) 13 Page - Texas Instruments |
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BQ2012 Datasheet(HTML) 13 Page - Texas Instruments |
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13 / 26 page  The EDVF values are: Where EDVF is: 0 Valid charge action detected, VSB ≥ 0.95V 1VSB < 0.95V providing that OVLD=0 (see FLGS2 register description) Temperature and Gas Gauge Register (TMPGG) The read-only TMPGG register (address=02h) contains two data fields. The first field contains the battery tem- perature. The second field contains the available charge from the battery. The bq2012 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 bq2012 calculates the available charge as a function of NAC, temperature, and a full reference, either LMD or PFC. The results of the calculation are available via the display port or the gas gauge field of the TMPGG register. The register is used to give available capacity in 1 16 increments from 0 to 15 16. The gas gauge display and the gas gauge portion of the TMPGG register are adjusted for cold temperature de- pendencies. A piece-wise correction is performed as fol- lows: The adjustment between > 0°C and -20°C<T<0°Chas a 10°C hysteresis. Nominal Available Charge Registers (NACH/NACL) The read/write NACH high-byte register (address=03h) and the read-only NACL low-byte register (address=17h) are the main gas gauging register for the bq2012. The NAC registers are incremented during charge actions and decremented during discharge and self-discharge actions. The correction factors for charge/discharge efficiency are applied automatically to NAC. On reset, if PROG6 = Z or low, NACH and NACL are cleared to 0; if PROG6 = high, NACH = PFC and NACL = 0. When the bq2012 detects a valid EDV1, NACH and NACL are reset to 0. Writing to the NAC registers affects the available charge counts and, therefore, affects the bq2012 gas gauge operation. Do not write the NAC regis- ters to a value greater than LMD. Battery Identification Register (BATID) The read/write BATID register (address=04h) is avail- able for use by the system to determine the type of bat- tery pack. The BATID contents are retained as long as VCC is greater than 2V. The contents of BATID have no effect on the operation of the bq2012. There is no de- fault setting for this register. Last Measured Discharge Register (LMD) LMD is a read/write register (address=05h) that the bq2012 uses as a measured full reference. The bq2012 adjusts LMD based on the measured discharge capacity 13 bq2012 Temperature Available Capacity Calculation > 0°C NAC / “Full Reference” -20°C < T < 0°C 0.75 * NAC / “Full Reference” < -20°C 0.5 * NAC / “Full Reference” TMP3 TMP2 TMP1 TMP0 Temperature 0000 T < -30°C 0001 -30°C < T < -20°C 0010 -20°C < T < -10°C 0011 -10°C < T < 0°C 0100 0°C < T < 10°C 0101 10°C < T < 20°C 0110 20°C < T < 30°C 0111 30°C < T < 40°C 1000 40°C < T < 50°C 1001 50°C < T < 60°C 1010 60°C < T < 70°C 1011 70°C < T < 80°C 1100 T > 80°C Table 7. Temperature Register Translation TMPGG Temperature Bits 7 6 5 4 3210 TMP3 TMP2 TMP1 TMP0 - - - TMPGG Gas Gauge Bits 76 5 4 3 2 1 0 - - - - GG3 GG2 GG1 GG0 FLGS1 Bits 76 5 4 3 2 1 0 - - - - - - - EDVF Not Recommended For New Designs |
Similar Part No. - BQ2012_15 |
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Similar Description - BQ2012_15 |
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