LTC4162EUFD-FST#PBF datasheet(42/52 Pages) AD

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LTC4162-F

Rev A

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Symbol Name

Command

Code

Access

Bit

Range

Default Description

icharge_jeita_5

[4:0]

SetsthechargecurrenttobeusedinJEITAregion5asillustratedintheJEITATemperature

Qualified Charging section. The value corresponds to charge_current_setting where the

charge current can be calculated using (icharge_jeita_5 + 1) × 1mV / RSNSB. The default

valueof15correspondstoaVCSP-VCSNservovoltageof16mVwhichishalfscaleorC/2.

ICHARGE_

JEITA_4_3_2_REG

0x28

R/W

[14:0]

32751

charge_current_settingvalueforJEITAtemperatureregionsjeita_t4,jeita_t3,andjeita_t2

icharge_jeita_4

[14:10] 31

SetsthechargecurrenttobeusedinJEITAregion4asillustratedintheJEITATemperature

Qualified Charging section. The value corresponds to charge_current_setting where the

charge current can be calculated using (icharge_jeita_4 + 1) × 1mV / RSNSB. The default

value of 31 corresponds to a VCSP-VCSN servo voltage of 32mV which is full scale.

icharge_jeita_3

[9:5]

SetsthechargecurrenttobeusedinJEITAregion3asillustratedintheJEITATemperature

Qualified Charging section. The value corresponds to charge_current_setting where the

charge current can be calculated using (icharge_jeita_3 + 1) × 1mV / RSNSB. The default

value of 31 corresponds to a VCSP-VCSN servo voltage of 32mV which is full scale.

icharge_jeita_2

[4:0]

SetsthechargecurrenttobeusedinJEITAregion2asillustratedintheJEITATemperature

Qualified Charging section. The value corresponds to charge_current_setting where the

charge current can be calculated using (icharge_jeita_2 + 1) × 1mV / RSNSB. The default

valueof15correspondstoaVCSP-VCSNservovoltageof16mVwhichishalfscaleorC/2.

CHARGER_

CONFIG_BITS_REG

0x29

R/W

[2:0]

Battery charger configuration settings

en_c_over_x_term

[2]

Enables charge current based (C/x) battery charger termination as set by ibat dropping

to the c_over_x_threshold in constant_voltage.

en_jeita

[0]

Enables the JEITA temperature qualified charging system.

vabsorb_delta

0x2A

R/W

[4:0]

Controls the absorb adder voltage in the absorb charging phase. The absorb charging

phase cell voltage servo level is based on the sum of this value and the vcharge_setting

or vcharge_jeita_1 to vcharge_jeita_6 levels. The absorb voltage level is given by

cell_count × (vabsorb_delta + vcharge_setting) × 12.5mV + 3.4125V but is limited by

hardware to a maximum of 3.8 V/cell_count. The default value of 0 disables the absorb,

or rapid charging, feature.

Enum: absorb_disable = 0

max_absorb_time

0x2B

R/W

[15:0]

At 1 second per count, this register sets an upper limit on the time the LTC4162 can be

in the absorb, or rapid, charge phase. The actual timer value is reported in tabsorbtimer.

Enums: absorb_15mins = 900,

absorb_30mins = 1800,

absorb_1hours = 3600,

absorb_90mins = 5400,

absorb_2hours = 7200

v_recharge_

lifepo4

0x2E

R/W

[15:0]

17424

Signed number that controls the recharge threshold voltage. After termination the

LTC4162 will begin a new charge cycle if vbat drops to this value. The default value of

17,424 corresponds to 17,424 / 18,191 × 3.5 × cell_count or about 3.35V / cell.

tchargetimer

0x30

[15:0]

If max_charge_time is written to a non zero value tchargetimer is the elapsed time in

minutes since the beginning of a charge cycle. The LTC4162 will terminate charging

when tchargetimer reaches the value in max_charge_time.

tcvtimer

0x31

[15:0]

This is the elapsed time in seconds since the battery charger has been in the

constant_voltage phase of charging. If this value exceeds max_cv_time then charging

is considered complete and will terminate. The constant-voltage timer can be disabled

by setting max_cv_time to 0.

tabsorbtimer

0x32

[15:0]

This is the elapsed time in seconds that the LTC4162 has been in the absorb phase of

charging. If this value exceeds max_absorb_time, the absorb phase is terminated and

normal charging resumes.

LTC4162EUFD-FST#PBF Datasheet(PDF) 42 Page - Analog Devices

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