SLUUB65B May 2015 – December 2022
The fuel gauge provides full support for the JEITA charging algorithm, which employs separate constant-current constant-voltage (CCCV) charging parameters, depending on the measuredTemperature(). The allowable charging range is divided into four regions defined by T1 Temp, T2 Temp, T3 Temp, T4 Temp, and T5 Temp, each with its own dedicated ChargingCurrent() and ChargingVoltage() values.
Figure 8-1, JEITA Charging Current Profile, and Figure 8-2, JEITA Charging Voltage Profile, provide a visual depiction of the JEITA charging algorithm.
Temperature hysteresis (Temp Hys) is also applied to movement between various ranges to prevent charging parameter oscillation when Temperature() continuously changes by a few degrees right on the edge of a temperature boundary. When moving from cooler to warmer temperatures, positive hysteresis is applied to the T1 Temp and T2 Temp thresholds. On the contrary, when moving from warmer to cooler temperatures, negative hysteresis is applied to the T3 Temp, T4 Temp, and T5 Temp thresholds. To convert the four-range JEITA profile to a classic, notebook-style three-range version, simply set T4 Temp = T3 Temp.
Figure 8-3, Temperature Hysteresis for Charging Current, and Figure 8-4, Temperature Hysteresis for Charging Voltage, illustrate how temperature hysteresis is applied depending on transition direction.
Subclass ID | Subclass | Offset | Name | Data Type | Value | Unit | ||
---|---|---|---|---|---|---|---|---|
Min | Max | Default | ||||||
39 | JEITA | 0 | T1 Temp | I1 | –128 | 127 | 0 | °C |
1 | T2 Temp | I1 | –128 | 127 | 10 | °C | ||
2 | T3 Temp | I1 | –128 | 127 | 45 | °C | ||
3 | T4 Temp | I1 | –128 | 127 | 50 | °C | ||
4 | T5 Temp | I1 | –128 | 127 | 60 | °C | ||
5 | Temp Hys | I1 | –128 | 127 | 1 | °C | ||
6 | T1-T2 Chg Voltage | I2 | 0 | 4600 | 4350 | mV | ||
8 | T2-T3 Chg Voltage | I2 | 0 | 4600 | 4350 | mV | ||
10 | T3-T4 Chg Voltage | I2 | 0 | 4600 | 4300 | mV | ||
12 | T4-T5 Chg Voltage | I2 | 0 | 4600 | 4250 | mV | ||
14 | T1-T2 Chg Current | U1 | 0 | 100 | 50 | Percent | ||
15 | T2-T3 Chg Current | U1 | 0 | 100 | 80 | Percent | ||
16 | T3-T4 Chg Current | U1 | 0 | 100 | 80 | Percent | ||
17 | T4-T5 Chg Current | U1 | 0 | 100 | 80 | Percent |