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| 38 || GPIO20 for buzzer control <span style="color:red;">(New add from V2.1 )</span>
|}
{| class="wikitable"
! Pin No. !! GPIO No. !! Remark !! Ver 1.2 !! Ver 1.3 !! Ver 2.0 !! Ver 2.1 !! Ver 2.2 !! Ver 2.3
|-
| 2, 4 || || 5V || √ || √ || √ || √ || √ || √
|-
| 3, 5 || || I2C for RTC and battery fuel-gauge systems || √ || √ || √ || √ || √ || √
|-
| 6 || || Ground || √ || √ || √ || √ || √ || √
|-
| 29 || GPIO05 || Power management || √ || √ || √ || √ || √ || √
|-
| 31 || GPIO06 || for AC power loss detection<br>(PLD jumper inserted, High=Power loss,Low=Power supply normal) || √ || √ || √ || √ || √ || √
|-
| 32 || GPIO12 || Power management || √ || √ || √ || √ || √ || √
|-
| 33 || GPIO13 || Power management || √ || √ || || || ||
|-
| 37 || GPIO26 || Power management<br>GPIO13 is replaced to GPIO26 from Ver 2.0 || || || √ || √ || √ || √
|-
| 38 || GPIO20 || for Buzzer control || || || || √ || √ || √
|}