LTC4012 datasheet(41/52 Pages) AD

41 / 52 page

LTC4162-L

Rev A

For more information www.analog.com

Symbol Name

Command

Code

Access

Bit

Range Default Description

jeita_t4

0x22

R/W

[15:0]

7112

Signed number that sets the JEITA temperature region transition temperature T4 between

JEITA regions R3 and R4. 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 7112 maps to about 45°C

for the expected thermistor β value of 3490K.

jeita_t5

0x23

R/W

[15:0]

6325

Signed number that sets the JEITA temperature region transition temperature T5 between

JEITA regions R5 and R6. 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 6325 maps to about 50°C

for the expected thermistor β value of 3490K.

jeita_t6

0x24

R/W

[15:0]

4970

Signed number that sets the JEITA temperature region transition temperature T6 between

JEITA regions R6 and R7. 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 4970 maps to about 60°C

for the expected thermistor β value of 3490K.

VCHARGE_

JEITA_6_5_REG

0x25

R/W

[9:0]

631

vcharge_setting values for JEITA temperature regions jeita_t6 and jeita_t5

vcharge_jeita_6

[9:5]

SetsthechargevoltagetobeusedinJEITAregion6asillustratedintheJEITATemperature

QualifiedChargingsection.Thevaluecorrespondstovcharge_settingandcanbecalculated

usingvcharge_jeita_6×12.5mV+3.8125V.Thedefaultvalueof19correspondsto4.05V.

vcharge_jeita_5

[4:0]

SetsthechargevoltagetobeusedinJEITAregion5asillustratedintheJEITATemperature

QualifiedChargingsection.Thevaluecorrespondstovcharge_settingandcanbecalculated

using vcharge_jeita_5 × 12.5mV + 3.8125V. The default value of 23 corresponds to 4.1V.

VCHARGE_

JEITA_4_3_2_REG

0x26

R/W

[14:0]

24575

vcharge_setting values for JEITA temperature regions jeita_t4, jeita_t3, and jeita_t2

vcharge_jeita_4

[14:10] 23

SetsthechargevoltagetobeusedinJEITAregion4asillustratedintheJEITATemperature

QualifiedChargingsection.Thevaluecorrespondstovcharge_settingandcanbecalculated

using vcharge_jeita_4 × 12.5mV + 3.8125V. The default value of 23 corresponds to 4.1V

vcharge_jeita_3

[9:5]

SetsthechargevoltagetobeusedinJEITAregion3asillustratedintheJEITATemperature

QualifiedChargingsection.Thevaluecorrespondstovcharge_settingandcanbecalculated

using vcharge_jeita_3 × 12.5mV + 3.8125V. The default value of 31 corresponds to 4.2V.

vcharge_jeita_2

[4:0]

SetsthechargevoltagetobeusedinJEITAregion2asillustratedintheJEITATemperature

QualifiedChargingsection.Thevaluecorrespondstovcharge_settingandcanbecalculated

using vcharge_jeita_2 × 12.5mV + 3.8125V. The default value of 31 corresponds to 4.2V.

ICHARGE_

JEITA_6_5_REG

0x27

R/W

[9:0]

495

charge_current_setting values for JEITA temperature regions jeita_t6 and jeita_t5

icharge_jeita_6

[9:5]

SetsthechargecurrenttobeusedinJEITAregion6asillustratedintheJEITATemperature

Qualified Charging section. The value corresponds to charge_current_setting where the

charge current can be calculated using (icharge_jeita_6 + 1) × 1mV / RSNSB. The default

value of 15 corresponds to a VCSP-VCSN servo voltage of 16mV which is half scale or C/2.

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

value of 15 corresponds to a VCSP-VCSN servo voltage of 16mV which is half scale or C/2.

ICHARGE_

JEITA_4_3_2_REG

0x28

R/W

[14:0]

32751

charge_current_settingvalueforJEITAtemperatureregionsjeita_t4,jeita_t3,andjeita_t2

LTC4012 Datasheet(PDF) 41 Page - Analog Devices

LTC4012 Datasheet(HTML) 41 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

Datasheet Download

Link URL