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BQ26200 Datasheet(PDF) 9 Page - Texas Instruments |
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BQ26200 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 18 page bq26200 SLUS509A − DECEMBER 2001 − REVISED NOVEMBER 2004 9 www.ti.com APPLICATION INFORMATION sleep mode operation The bq26200 begins low-power operation in response to the host issuing the sleep command. Before entering the low-power state, the host processor writes the command to transfer the registers to flash. After the sleep command is sent and the charge/discharge activity is less than the value indicated by the WOE bits shown in Table 3, the chip clock is powered down and data acquisition functions cease except for self-discharge detection. During device sleep the bq26200 periodically wakes briefly to maintain the self-discharge registers. The bq26200 wakes on either a low-to-high or high-to-low transition on the HDQ pin. Table 2. Operational States MODE ACTIVE REGISTERS Normal CCR, DCR, CTC, DTC, SDR Sleep SDR Table 3. WOE Thresholds WOE3–1 (HEX) VWOE (mV) 0h n/a 1h 3.516 2h 1.758 3h 1.172 4h 0.879 5h 0.703 6h 0.586 7h* 0.502 current sense offset calibration and compensation The bq26200 automatically and continuously compensates for V(SRP) − V(SRN)) offset. No host calibration or compensation is required. gas gauge control registers The host maintains the charge and discharge and the self-discharge count registers (CCR, CTC, DCR, DTC, and SCR). To facilitate this maintenance, the bq26200 CLR register resets the specific counter or register pair to zero. The host system clears a register by writing the corresponding register bit to 1. When the bq26200 completes the reset, the corresponding bit in the CLR register is automatically reset to 0. Clearing the DTC or CTC registers clears the MODE register bits STC/STD and sets the CTC/DTC count rates to the default value of 1.138 counts per second. device temperature measurement The bq26200 reports die temperature in units of oK through register pair TMPH-TMPL. Refer to the TMP register description for more details. |
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