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USB EZ-PD Type-C

Ivan_Lee
Contributor

CCGx SDK : CYPD3120 - how to disable internal LDO?

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1 Solution
YiZ_31
Moderator
Moderator

Hi Ivan,

Please disable the LDO with this register:

/*

* 20V regulator enable signal

* "1" : Enable regulator to output supply onto VDDD

* "0" : Disable regulator

*/

#define PDSS_VREG_VSYS_CTRL_VREG20_EN                       (1u << 0) /* <0:0> R:RW:0: */

Regards,

Eddie

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Ivan_Lee
Contributor

We have a exernal LDO ( VBUS to 3.3V ) to connect to CCG3's VSYS pin.

In a dead battery condition, then the internal LDO is turned on and the VDDD is supplied by VBUS.

after CCG3 power - on, how to disable internal LDO?

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YiZ_31
Moderator
Moderator

Hi Ivan,

Please disable the LDO with this register:

/*

* 20V regulator enable signal

* "1" : Enable regulator to output supply onto VDDD

* "0" : Disable regulator

*/

#define PDSS_VREG_VSYS_CTRL_VREG20_EN                       (1u << 0) /* <0:0> R:RW:0: */

Regards,

Eddie

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