Module Introduction SDQ only needs one channel to transmit the signal, and each bit of the data transmission consists of one low level and one high level. However, as to logic 1 and logic 0, they are judged by the time width kept by the low level. For example, if the time width kept by the low level is 0-20us, the BIT is logic 1; if the time width is 20-120us, the BIT is logic 0. Application Field SDQ is mainly used for the data transmission of all kinds of battery controllers, for example, bq2022, bq2024, bq26100 etc.