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BQ2050HSN Datasheet(PDF) 6 Page - Texas Instruments |
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BQ2050HSN Datasheet(HTML) 6 Page - Texas Instruments |
6 / 25 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 bq2050H 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 bq2050H “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 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 bq2050H PROGx Pro- grammed Full Count (PFC) PROG4 = L PROG4 = Z or H Units 12 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. bq2050H Programmed Full Count mVh, VSR Gain Selections Pin Connection PROG5 Compensation/Self-Discharge (See Tables 3 and 4) DISP Display State H Coke anode/disabled LEDs disabled Z Coke anode/ NAC 512 LEDs on when charging L Graphite anode/ NAC 512 LEDs on for 4 s Table 1. Self-Discharge and Capacity Compensation |
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