LTC4015_15 Datasheet, PDF(66/76 Page) Linear Technology – Multichemistry Buck Battery Charger Controller with Digital Telemetry System

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LTC4015_15 Datasheet, PDF (66/76 Pages) Linear Technology – Multichemistry Buck Battery Charger Controller with Digital Telemetry System

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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.

4015f

For more information www.linear.com/LTC4015

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