FS9912

Rev. 3.6

30/34

B VDDA Regulator

VDDA Regulator uses Bias Circuit as its bias current, while Bias Circuit uses VDDA power. According to the test

so far, when VDD<2.7V, it is easy to got the Start up problem and cause VDDA unable to start up. We strongly

recommend our customer doing the following setup when start VDDA Regulator. This setup can make VDDA

have one Diode Connection to VDD and start up VDDA Regulator

Example:

MOVLW

10001111B

MOVWF

NETD

MOVLW

00100000B

MOVWF

NETA

MOVLW

00000101B

MOVWF

NETB

CALL

DELAY10ms

Customer must know how to use FS9912_ICE to test the operating current of the chip, and test actually the

operating current of the chip and sleep current for corresponding custom specification. Reference

Document: ”FS9912_ICEUserManual_VXX”.