Datasheet LTC4162-F (Analog Devices) - 41

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REGISTER DESCRIPTIONS Symbol Name Command Access Bit Default Description Code Range jeita_t3
0x21 R/W [15:0] 7970 Signed number that sets the JEITA temperature region transition temperature T3 between JEITA regions R3 and R4. The temperature is based on the thermistor reading from the telemetry system; 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 7970 maps to about 40°C for the expected thermistor β value of 3490K.
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 telemetry system; 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 telemetry system; 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 telemetry system; 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_
0x25 R/W [9:0] 103 vcharge_setting values for JEITA temperature regions jeita_t6 and jeita_t5
JEITA_6_5_REG
vcharge_jeita_6 [9:5] 3 Sets the charge voltage to be used in JEITA region 6 as illustrated in the JEITA Temperature Qualified Charging section. The value corresponds to vcharge_setting and can be calculated using vcharge_jeita_6 × 12.5mV + 3.4125V. The default value of 3 corresponds to 3.45V. vcharge_jeita_5 [4:0] 7 Sets the charge voltage to be used in JEITA region 5 as illustrated in the JEITA Temperature Qualified Charging section. The value corresponds to vcharge_setting and can be calculated using vcharge_jeita_5 × 12.5mV + 3.4125V. The default value of 7 corresponds to 3.5V.
VCHARGE_
0x26 R/W [14:0] 7663 vcharge_setting values for JEITA temperature regions jeita_t4, jeita_t3, and jeita_t2
JEITA_4_3_2_REG
vcharge_jeita_4 [14:10] 7 Sets the charge voltage to be used in JEITA region 4 as illustrated in the JEITA Temperature Qualified Charging section. The value corresponds to vcharge_setting and can be calculated using vcharge_jeita_4 × 12.5mV + 3.4125V. The default value of 7 corresponds to 3.5V. vcharge_jeita_3 [9:5] 15 Sets the charge voltage to be used in JEITA region 3 as illustrated in the JEITA Temperature Qualified Charging section. The value corresponds to vcharge_setting and can be calculated using vcharge_jeita_3 × 12.5mV + 3.4125V. The default value of 15 corresponds to 3.6V. vcharge_jeita_2 [4:0] 15 Sets the charge voltage to be used in JEITA region 2 as illustrated in the JEITA Temperature Qualified Charging section. The value corresponds to vcharge_setting and can be calculated using vcharge_jeita_2 × 12.5mV + 3.4125V. The default value of 15 corresponds to 3.6V.
ICHARGE_
0x27 R/W [9:0] 495 charge_current_setting values for JEITA temperature regions jeita_t6 and jeita_t5
JEITA_6_5_REG
icharge_jeita_6 [9:5] 15 Sets the charge current to be used in JEITA region 6 as illustrated in the JEITA Temperature 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. Rev A For more information www.analog.com 41 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram ESD Diagram Timing Diagram Operation Applications Information Register Descriptions Typical Applications Package Description Revision History Typical Application Related Parts