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BQ2050SN Datasheet(PDF) 6 Page - Texas Instruments |
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BQ2050SN Datasheet(HTML) 6 Page - Texas Instruments |
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6 / 27 page  2. Programmed Full Count (PFC) or initial bat- tery capacity: The initial LMD and gas gauge rate values are pro- grammed by using PROG1–PROG4. The bq2050 is configured for a given application by selecting a PFC value from Table 2. The correct PFC may be determined by multiplying the rated battery capac- ity in mAh by the sense resistor value: Battery capacity (mAh) * sense resistor (Ω) = PFC (mVh) Selecting a PFC slightly less than the rated capac- ity provides a conservative capacity reference until the bq2050 “learns” a new capacity reference. Example: Selecting a PFC Value Given: Sense resistor = 0.05 Ω Number of cells = 2 Capacity = 1000mAh, Li-Ion battery, coke-anode Current range = 50mA to 1A Relative display mode Serial port only Self-discharge = NAC 512 per day @ 25°C Voltage drop over sense resistor = 2.5mV to 50mV Nominal discharge voltage = 3.6V Therefore: 1000mAh * 0.05Ω = 50mVh 6 bq2050 PROGx Pro- grammed Full Count (PFC) PROG4 = L PROG4 = Z Units 1 2 PROG3 = H PROG3 = Z PROG3 = L PROG3 = H PROG3 = Z PROG3 = L -- - SCALE = 1/80 SCALE = 1/160 SCALE = 1/320 SCALE = 1/640 SCALE = 1/1280 SCALE = 1/2560 mVh/ count H H 49152 614 307 154 76.8 38.4 19.2 mVh H Z 45056 563 282 141 70.4 35.2 17.6 mVh H L 40960 512 256 128 64.0 32.0 16.0 mVh Z H 36864 461 230 115 57.6 28.8 14.4 mVh Z Z 33792 422 211 106 53.0 26.4 13.2 mVh Z L 30720 384 192 96.0 48.0 24.0 12.0 mVh L H 27648 346 173 86.4 43.2 21.6 10.8 mVh L Z 25600 320 160 80.0 40.0 20.0 10.0 mVh L L 22528 282 141 70.4 35.2 17.6 8.8 mVh VSR equivalent to 2 counts/sec. (nom.) 90 45 22.5 11.25 5.6 2.8 mV Table 2. bq2050 Programmed Full Count mVh Selections Pin Connection PROG5 Compensation/ Self-Discharge PROG6 NAC on Reset DISP Display State H Table 4/Disabled PFC LEDs disabled Z Table 4/ NAC 512 0 LEDs on when charging L Table 3/ NAC 512 0 LEDs on for 4 sec. Note: PROG5 and PROG6 states are independent. Table 1. bq2050 Programming Not Recommended For New Designs |
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