BS812A-1/BS813A-1/BS814A-1/BS814A-2
BS816A-1/BS818A-2/BS8112A-3/BS8116A-3
I2C Option table
Functional Description
BS8112A-3ꢀandꢀBS8116A-3ꢀprovideꢀ4ꢀoptionsꢀcanꢀbeꢀ
setupꢀbyꢀI2Cꢀcommunicationꢀinterface.
Introduction
ThisꢀrangeꢀofꢀBS81xꢀtouchꢀkeyꢀdevicesꢀofferꢀanꢀ
easyꢀandꢀreliableꢀmeansꢀofꢀimplementingꢀtouchꢀ
switchꢀfunctionsꢀinꢀaꢀwideꢀrangeꢀofꢀapplicationsꢀ
whichꢀrequireꢀ2~16ꢀtouchꢀkeys.ꢀVeryꢀfewꢀexternalꢀ
componentsꢀ areꢀ requiredꢀ forꢀ fullꢀ touchꢀ keyꢀ
implementations.ꢀInꢀadditionꢀtoꢀsimpleꢀparallelꢀoutput,ꢀ
aꢀtwo-wireꢀserialꢀinterfaceꢀandꢀbinaryꢀoutputꢀofferꢀaꢀ
convenientꢀcommunicationꢀwithꢀanꢀexternalꢀMCU.ꢀ
•ꢀ IRQ_OMS Option
Address bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 R/W
IRQ_
OMS
0B0H
R/W
Name
IRQ_OMS
Default
Function
0: Level hold, low active
1: One-shot, low active
0
Sensitivityꢀadjustmentꢀisꢀalsoꢀanꢀeasyꢀmatter.ꢀByꢀtheꢀ
simpleꢀconnectionꢀofꢀaꢀsmallꢀcapacitorꢀtoꢀtheꢀtouchꢀ
keyꢀinputꢀpin,ꢀtheꢀchangesꢀinꢀtheꢀcapacitorꢀvalueꢀwillꢀ
beꢀreflectedꢀinꢀdifferentꢀsensitivityꢀvalues.ꢀByꢀhavingꢀaꢀ
fullyꢀintegratedꢀadaptiveꢀvoltageꢀdropꢀfunction,ꢀtouchꢀ
switchꢀapplicationsꢀcanꢀsaveꢀonꢀtheꢀusuallyꢀrequiredꢀ
LDO.
•ꢀ LSC Option
Address bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 R/W
0B4H
LSC
R/W
Option table
Name Default
Function
0: General power-saving
1: More power-saving
(wake-up time of 0.5 ~1s)
OMS/LSC Option table
LSC
1
TheꢀBS816A-1ꢀandꢀBS818A-2ꢀprovideꢀtwoꢀoptionsꢀtoꢀ
enhanceꢀapplicationꢀflexibility.ꢀ
•ꢀ OMS Option
•ꢀ Touch Key Wake-up Option
OMS -
Address
Name
bit7
bit6 bit5 bit4 bit3 bit2 bit1 bit0
R/W
Output Mode
Selection
Description
BS8112A-3
BS8116A-3
0B5H~0C0H
0B5H~0C4H
Kn_TH KnWU
0
Key n Trigger threshold value
R/W
NMOS output with internal
pull-high, low active
Open
BS816A-1
BS818A-2
Vss
CMOS output, high active
2-wire serial mode
Name Default
Function
Open
0: Enable wake-up function
1: Disable wake-up function
KnWU
0
4-wire Binary parallel
mode
Vss
Operating Mode
•ꢀ LSC Option
LSC- Lower
Standby Current
Thereꢀareꢀtwoꢀoperatingꢀmodesꢀforꢀthisꢀdeviceꢀseries,ꢀ
theꢀnormalꢀmodeꢀandꢀtheꢀstandbyꢀmode.ꢀDuringꢀtheꢀ
8ꢀsecondsꢀafterꢀpower-on,ꢀifꢀnoꢀtouchꢀkeyꢀactionsꢀ
areꢀdetected,ꢀtheꢀdevicesꢀwillꢀautomaticallyꢀenterꢀtheꢀ
standbyꢀmodeꢀtoꢀreduceꢀtheirꢀpowerꢀconsumption.ꢀ
Ifꢀaꢀkeyꢀorꢀkeysꢀareꢀpressed,ꢀtheꢀdeviceꢀwillꢀbeꢀ
wokenꢀupꢀandꢀwillꢀthenꢀenterꢀtheꢀnormalꢀmodeꢀandꢀ
outputꢀtheꢀkeyꢀstateꢀvalueꢀuntilꢀallꢀkeysꢀareꢀreleased.ꢀ
Afterꢀ8ꢀseconds,ꢀtheꢀsystemꢀwillꢀthenꢀrevertꢀtoꢀtheꢀ
standbyꢀmodeꢀagain.ꢀNoteꢀthatꢀtheꢀBS8112A-3ꢀandꢀ
BS8116A-3ꢀdevicesꢀcanꢀsetꢀupꢀtheꢀwake-upꢀkeysꢀ
individually.
Description
Open
General power-saving
BS816A-1/
BS818A-2
More power-saving
(wake-up time of
0.5~1s)
Vss
Rev. 1.32
7
January 19, 2016
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
