LTC4162EUFD-FSTM#PBF datasheet(46/52 Pages) AD

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LTC4162-F

Rev A

For more information www.analog.com

Symbol Name

Command

Code

Access

Bit

Range

Default Description

ibat

0x3D

[15:0]

Signed number that indicates the A/D measurement for the battery current. The value

is based on the A/D scaling factor for the charge current measurement (VCSP - VCSN)

whichis1.466µV/RSNSBamperes/LSB.Ifthechargerisnotenabledthevaluerepresents

drain on the battery and will be negative.

iin

0x3E

[15:0]

Signed number that indicates the A/D measurement for the input current (VCLP - VCLN).

The value is based on the A/D scaling factor for the input current measurement which

is 1.466µV / RSNSI amperes/LSB.

die_temp

0x3F

[15:0]

Signed number that indicates the A/D measurement for the die temperature. The value

can be calculated from the A/D reading in °C as TDIE(°C) = die_temp × 0.0215°C/

LSB - 264.4°C.

thermistor_voltage 0x40

[15:0]

SignednumberthatindicatestheA/DmeasurementfortheNTCpinvoltage.Thethermistor

value can be determined by the expression RNTC = RNTCBIAS × thermistor_voltage

/ (21829 - thermistor_voltage). Recall that the thermistor has a negative temperature

coefficientsohighertemperaturesmakelowerthermistor_voltagereadingsandvice-versa.

Enum: open_thermistor = 21684

bsr

0x41

[15:0]

IndicatestheA/Dmeasurementfortheper-cellbatteryresistance.Thebatteryresistanceis

relative to the battery charge current setting resistor, RSNSB, and can be computed in Ω

fromcell_count×bsr×RSNSB/500.Ifthechargecurrent,ibat,isbelowicharge_over_10,

bsr_questionable will be set.

jeita_region

0x42

[2:0]

Indicates the LTC4162 JEITA battery temperature region containing the thermistor_

voltage. The temperature region consists of the values bounded by the transition

temperatures jeita_t(R-1) and jeita_t(R). Recall that the thermistor has a negative

temperature coefficient so higher temperatures make lower thermistor_voltage readings

and vice-versa. JEITA temperature-controlled charging is active only when en_jeita is

at its default value of 1. JEITA regions R7 (jeita_region = 7) and R1 (jeita_region = 1)

indicate that the thermistor_voltage (battery temperature) is out of range for charging

and therefore charging is paused (ntc_pause). The transition temperatures are set by

jeita_t1 through jeita_t6.

Enums: R7 = 7,

R6 = 6,

R5 = 5,

R4 = 4,

R3 = 3,

R2 = 2,

R1 = 1

CHEM_CELLS_REG 0x43

[11:0]

Programmed battery chemistry

chem

[11:8]

Indicates the chemistry of the battery being charged. For additional safety, application

softwarecantestthisvaluetoensurethatthecorrectversionoftheLTC4162(LTC4162-L,

LTC4162-F or LTC4162-S) is populated on the circuit board.

Enums: LTC4162_LAD = 0,

LTC4162_L42 = 1,

LTC4162_L41 = 2,

LTC4162_L40 = 3,

LTC4162_FAD = 4,

LTC4162_FFS = 5,

LTC4162_FST = 6,

LTC4162_SST = 8,

LTC4162_SAD = 9

LTC4162EUFD-FSTM#PBF Datasheet(PDF) 46 Page - Analog Devices

LTC4162EUFD-FSTM#PBF Datasheet(HTML) 46 Page - Analog Devices

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