Charge Pump何時啓動何時關閉,在芯片上如何量測?
Charge Pump開關受到CPRENB, CPON,CPAUTO緩存器控制,以SN8P1919爲例.
Auto-Mode Description:
當CPON=1時, Charge pump强制啓動,此時AVDDCP電壓約爲VDD *2,
當CPON=0時, Charge pump强制關閉,此時AVDDCP電壓約爲VDD
當設爲Auto mode時, ( CPON=0, CPAUTO=1)
VDD<4.2V, Charge Pump自動啓動, AVDDCP電壓約爲VDD *2
VDD>4.2V, Charge Pump自動關閉, AVDDCP電壓約爲VDD
當VDD電壓會由4.4V持續下降到3.6V,不可設定爲Auto mode,否則可能造成Charge pump瞬間多次開關而損壞
詳細參考文件: SN8P1900系列Datasheet
| CPRENB | CPON | CPAUTO | Charge-Pump Status | Regulator Status |
| 0 | X | X | OFF | OFF |
| 1 | 0 | 0 | OFF | ON |
| 1 | 0 | 1 | Auto Mode | ON |
| 1 | 1 | 0 | Always ON | ON |
| CPRENB | CPON | CPAUTO | AVDDRENB | VDD | Charge-Pump Status | Regulator Status | AVDDR Output | PGIA, ADC Function |
| 1 | 0 | 1 | 1 | >4.2V | OFF | ON | 3.8V | Available |
| ≦ 4.2V | ON | ON | 3.8V | Available |
當CPON=0時, Charge pump强制關閉,此時AVDDCP電壓約爲VDD
當設爲Auto mode時, ( CPON=0, CPAUTO=1)
VDD<4.2V, Charge Pump自動啓動, AVDDCP電壓約爲VDD *2
VDD>4.2V, Charge Pump自動關閉, AVDDCP電壓約爲VDD
當VDD電壓會由4.4V持續下降到3.6V,不可設定爲Auto mode,否則可能造成Charge pump瞬間多次開關而損壞
詳細參考文件: SN8P1900系列Datasheet