LTC4012 datasheet(42/52 Pages) AD

42 / 52 page

LTC4162-L

Rev A

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Symbol Name

Command

Code

Access

Bit

Range Default Description

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

value of 15 corresponds to a VCSP-VCSN servo voltage of 16mV which is half scale or C/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.

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.

charger_state

0x34

[12:0]

256

Real time battery charger state indicator. Individual bits are mutually exclusive.

Enums: bat_detect_failed_fault = 4096,

battery_detection = 2048,

charger_suspended = 256,

precharge = 128,

cc_cv_charge = 64,

ntc_pause = 32,

timer_term = 16,

c_over_x_term = 8,

max_charge_time_fault = 4,

bat_missing_fault = 2,

bat_short_fault = 1

charge_status

0x35

[5:0]

Charge status indicator. Individual bits are mutually exclusive and are only active in

charging states.

Enums: ilim_reg_active = 32,

thermal_reg_active = 16,

vin_uvcl_active = 8,

iin_limit_active = 4,

constant_current = 2,

constant_voltage = 1,

charger_off = 0

LIMIT_ALERTS_REG 0x36

[15:0]

Limit alert register. This input/output register indicates that an enabled alert has occurred.

Individual alerts are enabled in EN_LIMIT_ALERTS_REG. Writing 0 to any bit clears that

alert. Once set, alert bits remain high until cleared or disabled.

telemetry_valid_alert

[15]

Alert that indicates that the telemetry system warm-up time has expired and valid

telemetry data is available from the serial port. This alert bit is cleared by writing it back

to 0 with the remaining bits in this register set to 1s. It can also be cleared by clearing

en_telemetry_valid_alert.

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