LTC4162EUFD-FST#PBF datasheet(47/52 Pages) AD

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LTC4162-F

Rev A

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Symbol Name

Command

Code

Access

Bit

Range

Default Description

cell_count

[3:0]

Indicates the cell count value detected by the CELLS0 and CELLS1 pin strapping.

cell_count always indicates 0 when the battery charger is not enabled such as when

there is no input power available.

Enum: Unknown = 0

icharge_dac

0x44

[4:0]

Indicates the actual charge current setting applied to the charge current digital to analog

converter. icharge_dac is ramped up/down to implement digital soft-start/stop. The

LTC4162 sets the value of icharge_dac based on charger_state, thermistor_voltage,

and charger settings including charge_current_setting, icharge_jeita_2 through

icharge_jeita_6, jeita_t1 through jeita_t6 and en_jeita. Recall that the charge current is

regulated by controlling the voltage across an external current sense resistor RSNSB.

The servo voltage is given by (icharge_dac + 1) × 1mV. The charge current servo level

is thus given by (icharge_dac + 1) × 1mV/RSNSB.

vcharge_dac

0x45

[4:0]

This is the actual battery voltage setting applied to the charge voltage digital to analog

converter. The LTC4162 sets the value of vcharge_dac based on charger_state,

thermistor_voltage, and charger settings including vcharge_setting, vcharge_jeita_2

throughvcharge_jeita_6,jeita_t1throughjeita_t6,thermistor_voltage,vabsorb_deltaand

en_jeita. The charge voltage setting can be computed from cell_count × (vcharge_setting

× 12.5mV + 3.4125V) where vcharge_setting also ranges from 0 to 31 (3.8V max).

iin_limit_dac

0x46

[5:0]

Indicatestheactualinputcurrentlimit.Theiin_limit_dacwillfollowthevalueprogrammed

in iin_limit_target. The input current will be regulated to a maximum value given by

(iin_limit_dac + 1) × 500µV / RSNSI.

vbat_filt

0x47

[15:0]

Signed number that is a digitally filtered version of the A/D measurement of vbat. The

value is based on the A/D scaling factor for the battery voltage measurement which is

cell_count × 192.4µV/LSB at the BATSENS+ pin.

bsr_charge_

current

0x48

[15:0]

Signed number that is the battery charge current that existed during the battery series

resistance measurement. The value is based on the A/D value, ibat, which has a scaling

factor of 1.466µV / RSNSB amperes/LSB. If the battery series resistance (bsr) test runs

with ibat values less than icharge_over_10, the accuracy of the test is questionable due

to low signal level and bsr_questionable will set. Rerunning the battery series resistance

test earlier in the charge cycle with higher ibat, and therefore higher bsr_charge_current,

will give the most accurate result.

Enum: icharge_over_10 = 2184

TELEMETRY_

STATUS_REG

0x4A

[1:0]

Telemetry system status register

bsr_questionable

[1]

Indicates that the battery series resistance measurement is questionable due to low

signal, specifically that ibat was less than icharge_over_10, when the last battery series

resistance (bsr) measurement was taken. bsr_charge_current contains the ibat A/D value

present when the battery series resistance measurement was made.

telemetry_valid

[0]

Indicates that the telemetry system autozero amplifiers have had sufficient time,

approximately 12ms, to null their offsets. Battery charging is disabled until the telemetry

system warm up time has passed.

input_

undervoltage_dac

0x4B

[7:0]

Input undervoltage regulation digital to analog converter value. The regulation voltage

is given by (input_undervoltage_dac + 1) × 140.625mV. If enabled, the MPPT algorithm

will directly manipulate this value. Otherwise it will follow input_undervoltage_setting.

Revision: 1773 Date: 2018-05-09 10:26:00 -0400 (Wed, 09 May 2018)

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