Chengdu Ebyte Electronic Technology Co., Ltd. E22-xxxT30x series product user manual
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settings for details. (can be left floating)
Module power supply positive reference, voltage range: 3.3 ~ 5.5VDC
3.2 E22-230/400/900T30S mechanical dimensions and pin definitions
Module power supply positive reference, voltage range: 3.3~5.5VDC
Used to indicate the working status of the module;