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BQ2014 Datasheet(PDF) 6 Page - Texas Instruments |
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BQ2014 Datasheet(HTML) 6 Page - Texas Instruments |
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6 / 27 page  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 for absolute mode provides capacity above the full reference for much of the battery's life. Example: Selecting a PFC Value Given: Sense resistor = 0.1 Ω Number of cells = 6 Capacity = 2200mAh, NiCd battery Current range = 50mA to 2A Relative display mode Serial port only Self-discharge = C 64 Voltage drop over sense resistor = 5mV to 400mV Therefore: 2200mAh ∗ 0.1Ω = 220mVh Select: PFC = 33792 counts or 211mVh PROG1 = float PROG2 = float PROG3 = float PROG4 = low PROG5 = float DONE = low 6 bq2014 PROGx Programmed 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/s (nom.) 90 45 22.5 11.25 5.6 2.8 mV Table 2. bq2014 Programmed Full Count mVh Selections Pin Connection PROG5 Self-Discharge Rate DISP Display State H Disabled LED disabled Z NAC 64 LED enabled on discharge when VSRO < -4mV or during a valid charge L NAC 47 LED on Table 1. bq2014 Programming Not Recommended For New Designs |
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