LTC4162EUFD-FST#PBF datasheet(40/52 Pages) AD

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LTC4162-F

Rev A

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Symbol Name

Command

Code

Access

Bit

Range

Default Description

charge_current_

setting

0x1A

R/W

[4:0]

Controls the target charge current regulation servo level. The charge current is regulated

by servoing the voltage across an external current sense resistor, RSNSB, between the

CSP and CSN pins. The servo voltage is given by (charge_current_setting + 1) × 1mV. The

effectivechargecurrent,determinedbytheexternalresistor,RSNSB,isgivenby(charge_

current_setting + 1) × 1mV / RSNSB. icharge_dac will follow charge_current_setting

unless thermal_reg_active is true or the JEITA algorithm, with en_jeita, has altered it.

vcharge_setting

0x1B

R/W

[4:0]

Controls the final charge voltage regulation servo level. To maintain inherent over-

charge protection, only LiFePO4 appropriate charge voltage values can be selected. 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). vcharge_dac

will follow vcharge_setting unless the advanced JEITA temperature control system

(en_jeita) has altered it.

Enums: vcharge_lifepo4_default = 31,

vcharge_lifepo4_3p6v = 15

c_over_x_

threshold

0x1C

R/W

[15:0]

2184

Signed number that sets the ibat A/D value used to qualify C/x detection and termination.

The C/x level is based on the value for ibat which has a scaling factor of 1.466µV /

RSNSB amperes/LSB. For example, to make the C/x level C/10 (a very common choice)

then c_over_x_threshold should be set to c_over_10 which is 10% of the maximum

possible ibat reading (32mV × 37.5 × 18,191 / 10). 32mV is the full scale charge current

signal from CSP to CSN, 37.5 is the internal charge amplifier's gain and 18,191 is the

A/D's span term in counts per Volt.

Enum: c_over_10 = 2184

max_cv_time

0x1D

R/W

[15:0]

3600

Sets the constant-voltage termination setting against which the tcvtimer is compared.

The timer begins at the onset of the constant_voltage phase of charging and increments

at one count per second. The default setting is 3,600 (1 hour). Setting this value to 0

disables the constant-voltage termination feature.

Enums: cvtimer_disabled = 0,

30mins = 1800,

1hour_default = 3600,

2hours = 7200,

4hours = 14400

max_charge_time

0x1E

R/W

[15:0]

Setsthetotalchargetimeterminationsettingagainstwhichthetchargetimeriscompared.

The default value of 0 disables the total charge time feature and prevents the tchargetimer

from running. If enabled with a non zero value, the tchargetimer begins counting at the

onset of a charge cycle and increments at one count per minute.

Enum: maxchargetime_disable = 0

jeita_t1

0x1F

R/W

[15:0]

16117

Signed number that sets the JEITA temperature region transition temperature T1 between

JEITA regions R1 and R2. The temperature is based on the thermistor reading from the

telemetrysystem;RNTC=RNTCBIAS×(21829-thermistor_voltage)/thermistor_voltage.

Recall that the thermistor has a negative temperature coefficient so jeita_t1, representing

colder temperatures, will have the highest value and jeita_t6, representing warmer

temperatures, will have the lowest value. The default value of 16117 maps to about 0°C

for the expected thermistor β value of 3490K.

jeita_t2

0x20

R/W

[15:0]

14113

Signed number that sets the JEITA temperature region transition temperature T2 between

JEITA regions R2 and R3. The temperature is based on the thermistor reading from the

telemetrysystem;RNTC=RNTCBIAS×(21829-thermistor_voltage)/thermistor_voltage.

Recall that the thermistor has a negative temperature coefficient so jeita_t1, representing

colder temperatures, will have the highest value and jeita_t6, representing warmer

temperatures, will have the lowest value. The default value of 14113 maps to about 10°C

for the expected thermistor β value of 3490K.

LTC4162EUFD-FST#PBF Datasheet(PDF) 40 Page - Analog Devices

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