User`s guide

Rev. 1.10 108 November 14, 2014 Rev. 1.10 109 November 14, 2014
HT66FW2230
Wireless Charger A/D Flash 8-Bit MCU
Input Voltage Range
Theinputvoltagecanbepositiveornegative,whichtogetherwiththePGAoperatingmode,
providesforamoreexibleapplication.
(1)IfV
IN
>0andthePGAoperatesinthenon-invertingmode,theoutputvoltageofthePGAis
INPGA
VRRVO ×+= )/1(
12
(2)
(2)WhenthePGAoperatesinthenon-invertermode,italsoprovidesaunitygainbufferfunction.
IfDEM[1:0]=01andDEMG[2:0]=000,thePGAgainwillbe1andisconfiguredasunitygain
buffer.SwitchesS2andS3willbeopeninternallyandtheoutputvoltageofthePGAis
INPGA
VVO =
(3)
(3)If0>V
IN
>-0.7VandthePGAoperatesintheinvertermode,theoutputvoltageofthePGAis
INPGA
VRRVO
×−= )/(
12
(4)
Note:ifV
IN
isnegative,itshouldnotbelowerthan-0.7Vtoavoidleakagecurrent.
Offset Calibration
Thedemodulationcircuithas4operatingmodescontrolledbyDEM1~DEM0.Oneofthesemodes
isthecalibrationmode(0Vinputmode).Inthecalibrationmode,theOPandcomparatoroffsetcan
becalibrated.
OPAMPcalibration:
• Step1:SetDEM[1:0]=11,DEMAOFM=1,thedemodulatorisnowintheOPAMPcalibration
mode.
• Step2:SetDEMAOF[4:0]=00000thenreadtheDEMAXbitstatus.
•
Step3:LetDEMAOF=DEMAOF+1thenreadtheDEMAXbitstatus;ifDEMAXischanged,
recordtheregisterdataasVOS1.
•
Step4:SetDEMAOF[4:0]111111thenreadtheDEMAXbitstatus.
•
Step5:LetDEMAOF=DEMAOF-1thenreadtheDEMAXbitstatus;ifDEMAXischanged,
recordtheregisterdataasVOS2.
•
Step6:RestoreVOS=(VOS1+VOS2)/2totheDEMAOFregister.Thecalibrationisnow
nished.
Comparatorcalibration:
• Step1:SetDEM[1:0]=11,DEMCOFM=1,theOCPisnowinthecomparatorcalibrationstatus.
•
Step2:SetDEMCOF[4:0]=00000thenreadtheDEMCXbitstatus.
•
Step3:LetDEMCOF=DEMCOF+1thenreadtheDEMCXbitstatus;ifDEMCXischanged,
recordtheregisterdataasVOS1.
•
Step4:SetDEMCOF[4:0]=11111thenreadtheDEMCXbitstatus.
•
Step5:LetDEMCOF=DEMCOF-1thenreadtheDEMCXbitstatus;ifDEMCXdataischanged,
recordtheregisterdataasVOS2.
• Step6:RestoreVOS=(VOS1+VOS2)/2totheDEMCOFregister.Thecalibrationisnownished.