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BQ2040SN Datasheet(PDF) 11 Page - Texas Instruments |
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BQ2040SN Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 36 page  n Read block The particular protocol used is a function of the com- mand. The protocols used are shown in Figure 3. Host-to-bq2040 Messages (see Table 4) ManufacturerAccess() (0x00) This read/write word is an open location. Input/Output: word. RemainingCapacityAlarm() (0x01) This function sets or returns the low-capacity alarm value. When RM falls below the RemainingCapac- ityAlarm value initialized from the external EE- PROM, the Remaining_Capacity_Alarm bit is set in BatteryStatus. The system may alter this alarm dur- ing operation. Input/Output: unsigned integer. This sets/returns the value where the Remaining_Capacity_Alarm bit is set in Battery Status. Units: mAh Range: 0 to 65,535mAh RemainingTimeAlarm() (0x02) This function sets or returns the low remaining time alarm value. When the AverageTimeToEmpty falls be- low this value, the Remaining_Time_Alarm bit in Bat- teryStatus is set. The default value for this register is programmed in EE 0x02-0x03.. The system may alter this alarm during operation. Input/Output: unsigned integer. This sets/returns the value where the Remaining_Time_Alarm bit is set in Battery Status. Units: minutes Range: 0 to 65,535 minutes BatteryMode() (0x03) This read/write word selects the various battery opera- tional modes. The bq2040 supports the battery capacity information specified in mAh. This function also deter- mines whether the bq2040 charging values are broad- casted to the Smart Battery Charger address. Writing bit 14 to 1 disables voltage and current Master Mode broadcasts to the Smart Battery Charger. Bit 14 is automatically reset to 0 if SMBC and SMBD = 0 for greater than 2 seconds (i.e. pack removal). Writing bit 13 to 1 disables all Master Mode broadcasts including alarm messages to the Smart Battery Charger and Host. The bit remains set until overwritten. Pro- gramming bit 3 of FLAGS2 in the EEPROM (EE0x3f) initializes this bit to a 1. Bit 7 is the condition request flag. It is set when the bq2040 is initialized from the EEPROM and reset when a learning cycle has been completed. It is also set toa1if CycleCount increases by 32 without a new learning cycle. AtRate() (0x04) This read/write word is the first half of a two-function set used to set the AtRate value used in calculations made by the AtRateTimeToFull and AtRateTime- ToEmpty. 11 bq2040 FG204001.eps S Battery Address 0001011 0 A Command Code A Data byte low A Data byte high AP 1 1 8 1 8 1 8 1 1 7 1 S Battery Address 0001011 0 A Command Code A Battery Address A 1 1 1 7 1 8 1 1 7 1 S 1 AA 1 8 1 8 P Data byte low Data byte high S Battery Address 0001011 0 A Command Code A Battery Address A 1 1 1 7 1 8 1 1 7 1 S 1 AA 1 8 1 8 Byte Count =N Data byte 1 AA 1 8 1 8 P Data byte 2 Data byte N 1 bq2040 System Host Block Read Read Word Write Word A – ACKNOWLEDGE A – NOT ACKNOWLEDGE S – START P – STOP Figure 3. Host Communication Protocols Not Recommended For New Designs |
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