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BQ2018TS-E1TRG4 Datasheet(PDF) 4 Page - Texas Instruments |
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BQ2018TS-E1TRG4 Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 25 page  4 RBI Input The RBI input pin is used with a storage capacitor or ex- ternal supply to provide back-up potential to the internal RAM when VCC drops below 2.4V. The maximum dis- charge current is 100nA in this mode. The bq2018 out- puts VCC on RBI when the supply is above 2.4V, so a di- ode is required to isolate an external supply. Charge/Discharge Count Operation Table 2 shows the main counters and registers of the bq2018. The bq2018 accumulates charge and discharge counts into two main count registers, the Discharge Count Register (DCR) and the Charge Count Register (CCR). The bq2018 produces charge and discharge counts by sensing the voltage difference across a low- value resistor between the negative terminal of the bat- tery pack and the negative terminal of the battery. The DCR or CCR counts depending on the signal between SR1 and SR2. During discharge, the DCR and the Discharge Time Counter (DTC) are active. If VSR1 is less than VSR2, indi- cating a discharge, the DCR counts at a rate equivalent to 12.5 µV every hour, and the DTC counts at a rate of 1 count/0.8789 seconds (4096 counts per 1 hour). For exam- ple, a -100mV signal produces 8000 DCR counts and 4096 DTC counts each hour. The amount of charge removed from the battery can easily be calculated. bq2018 Table 2. bq2018 Counters Name Description Range RAM Size DCR Discharge count register VSR1 < VSR2 (Max. =-200mV) 12.5µVh increments 16-bit CCR Charge count register VSR1 >VSR2 (Max. = +200mV) 12.5µVh increments 16-bit SCR Self-discharge count register 1 count/hour @ 25°C 16-bit DTC Discharge time counter 1 count/0.8789s default 1 count/225s if STD is set 16-bit CTC Charge time counter 1 count/0.8789s default 1 count/225s if STC is set 16-bit MODE/ WOE MODE/ Wake output enable — 8-bit RBI SR2 SR1 WAKE HDQ VSS VCC REG BQ2018 U1 1 2 3 45 6 7 8 C1 VCC SST113 Q1 BAT+ BZX84C5V6 D1 2 HDQ BZX84C5V6 D2 2 100 R5 C4 C2 C3 BAV99 D3 1M d s R4 RBI PACK- BAT- 1W 0.05 R1 100K R3 100K R2 WAKE 1K R6 VCC 0.01 µF 0.1 µF 0.1 µF 0.1 µF 0.1 µF C5 2018typAp.eps Figure 2. Typical Application |
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