User`s guide

Rev. 1.10 116 November 14, 2014 Rev. 1.10 117 November 14, 2014
HT66FW2230
Wireless Charger A/D Flash 8-Bit MCU
Internal Reference Voltage – IVREF
R1
R2
A
G=2
Band gap
IVREF
To ADC V
REF
To ADC Input
V
BG
Internal Reference Voltage Circuit
ThebandgapcircuitwillautomaticallyswitchonifeithertheLVRorLVDisenabledoriftheVREF
isenabled.
Demodulator & OCP Miscellaneous Control Register Description
TheDCMISCregisterisusedtocontroltheD/AVREFsourceselection,tostoretheoperational
amplieroutputstatusasalogicalconditionandtoselectthedemodulatorOPAinputsource.The
VREFCregisterisusedtocontrolVREFandtostoretheVREFOPAoutputstatus.VRACAListhe
VREFOPAcalibrationregister.
VREFC register
Bit 7 6 5 4 3 2 1 0
Name VREFEN — — — — — — VRAX
R/W R/W — — — — — — R
POR 0 — — — — — — 0
Bit7 VREFEN:VREFenablebit
0:Disable
1:Enable
Note:ThebandgapwillbeenabledifeithertheLVR,LVD,VBG(ADC)orVREFisenabled.
Bit0 VRAX:VREFOPAoutput,readonly.
VRACAL Register – VREF OPA calibration register
Bit 7 6 5 4 3 2 1 0
Name VRAOFM VRARS VRAOF5 VRAOF4 VRAOF3 VRAOF2 VRAOF1 VRAOF0
R/W R/W R/W R/W R/W R/W R/W R/W R/W
POR 0 0 1 0 0 0 0 0
Bit7 VRAOFM:Inputoffsetvoltagecancellationmodeornormaloperatingmodeselection
0:Normaloperatingmode
1:Inputoffsetvoltagecancellationmode
Bit6 VRARS:Inputoffsetvoltagecancellationreferenceselectionbit
0:Selectnegativeinputasthereferenceinput
1:Selectpositiveinputasthereferenceinput
Bit5~0 VRAOF5~VRAOF0:Comparatorinputoffsetvoltagecalibrationcontrol