JAJSSD2A October 2023 – December 2023 BQ25638
PRODUCTION DATA
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To improve the safety of charging Li-ion batteries, JEITA guideline was released on April 20, 2007. The guideline emphasized the importance of avoiding a high charge current and high charge voltage at certain low and high temperature ranges. As battery technology continues to evolve, battery manufacturers have released temperature safety specifications that extend beyond the JEITA standard. BQ25638 features a highly flexible temperature-based charging profile to meet these advanced specifications while remaining backwards compatible with the original JEITA standard.
REGION | CONTROL REGISTER | CONTROL VALUE |
---|---|---|
COLD | TS_TH1 | -5ºC |
0ºC | ||
COOL | TS_TH2 | 5ºC |
7.5ºC | ||
10ºC | ||
12.5ºC | ||
PRECOOL | TS_TH3 | 15ºC |
17.5ºC | ||
20ºC | ||
22.5ºC | ||
PREWARM | TS_TH4 | 32.5ºC |
35ºC | ||
37.5ºC | ||
40ºC | ||
WARM | TS_TH5 | 42.5ºC |
45ºC | ||
47.5ºC | ||
50ºC | ||
HOT | TS_TH6 | 55ºC |
60ºC |
Charging termination and the charging safety timer are adjusted within the temperature zones to reflect changes to the charging current. When IPRECHG and ICHG are reduced to 20% or 40% in the cool or warm temperature zones, the charging safety timer will count at half rate. If charging is suspended, the safety timer is suspended, the STAT pin blinks and CHG_STAT is set to 000 (not charging). Charging termination is still enabled (when EN_TERM=1) with termination current (ITERM) unchanged when charging current is reduced in cool or warm tempreature zones.