Datasheet LTC4015 (Analog Devices) - 64

LTC4015
DETAILED REGISTER DESCRIPTIONS READOUTS, STATUS, AND ALERTS (Sub-Addresses 0x34 through 0x46) MAX_CHARGE_TIMER (Sub-Address 0x30, Bits 15:0, R)
For lithium chemistries, this 16-bit word indicates the time (in seconds) that the battery has been charging. See the MAX_CHARGE_TIME register description and the section Maximum Charge Time for more information. For lead-acid batteries, MAX_CHARGE_TIMER is not used.
CV_TIMER (Sub-Address 0x31, Bits 10:0, R)
For lithium chemistries, this 16-bit word indicates the time (in seconds) that the battery has been in constant-voltage regulation. See the MAX_CV_TIME register description and the section Timer Termination for more information. For lead-acid batteries, CV_TIMER is not used.
ABSORB_TIMER (Sub-Address 0x32, Bits 10:0, R)
For LiFePO4 and lead-acid batteries, this 16-bit word indicates the time (in seconds) that the battery has been in absorb phase. See the MAX_ABSORB_TIME register description and the sections LiFePO4 Absorb Charge and Lead-Acid Absorb Charge for more information. For Li-Ion batteries, ABSORB_TIMER is not used.
EQUALIZE_TIMER (Sub-Address 0x33, Bits 15:0, Fixed: R, Programmable: R/W)
For lead-acid batteries, this 16-bit word indicates the time (in seconds) that the battery has been in equalization charge phase. See the EQUALIZE_TIME register description and the section Lead-Acid Equalization Charge. For lithium chemistries, EQUALIZE_TIMER is not used.
CHARGER_STATE (Sub-Address 0x34, Bits 10:0, R)
This register consists of individual battery charger state indicator bits. Individual bits are mutually exclusive (a maximum of one bit is asserted at any given time). See the section Battery Charger Algorithms for more information regarding the charger states.
equalize_charge (Sub-Address 0x34, Bit 10, R)
This bit indicates that the LTC4015 is in the equalize phase of a battery charge cycle (applies to lead-acid chemis- tries only).
absorb_charge (Sub-Address 0x34, Bit 9, R)
This bit indicates that the LTC4015 is in the absorb phase of a battery charge cycle (applies to LiFePO4 and lead- acid chemistries only).
charger_suspended (Sub-Address 0x34, Bit 8, R)
This bit indicates that the LTC4015 charger is suspended, due to any of the following conditions occurring: (a) the input voltage on the VIN pin falls below or within 100mV of the BATSENS pin voltage, (b) suspend_charger is writ- ten to 1 via the serial port, or (c) a system fault condition occurs (VIN overvoltage, 2P5VCC undervoltage, INTVCC undervoltage, DRVCC undervoltage, thermal shutdown, missing RT resistor, or invalid combination of CELLS pins).
precharge (Sub-Address 0x34, Bit 7, R)
This bit indicates that the LTC4015 is in the precondition charge phase of a battery charge cycle due to the battery being below the low battery threshold of 2.9V/cell (applies to Li-Ion chemistries only).
cc_cv_charge (Sub-Address 0x34, Bit 6, R)
This bit indicates that the LTC4015 is in the CC-CV phase of a battery charge cycle. 4015fb 64 For more information www.linear.com/LTC4015 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Data Sheet Conventions Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram I2C Timing Diagram Operation Applications Information Register Description DETAILED Register Descriptions Typical Applications Package Description Revision History Typical Application Related Parts