BU21170MUV Datasheet, PDF (23/33 Pages) Rohm – Capacitive Switch Controller IC

BU21170MUV
Switch operation
Every sensor is used for simple switch. Each switch has the registers of detected Touch/Release/Hold operations.
Every switch supports to multi-detect Touch/Release/Hold. Unused switches are maskable.
Case1 Long push setting CONTSEL = 1
Send clear command for interrupt of SW0 ON
SIN0(sensor ON/OFF）
key ON recognition(SW0)
key long push recognition(SW0)
Setting of long push time
key OFF recognition(SW0)
Port INT
Send clear command for interrupt of SW0 long push
Send clear command for interrupt of SW0 OFF
Setting of long push time
Case2 Long push setting CONTSEL = 0
Send clear command for interrupt of SW0 ON
SIN0(sensor ON/OFF）
key ON recognition(SW0)
key long push recognition(SW0)
Setting of long push time
Send clear command for interrupt of SW0 long push Send clear command for interrupt of SW0 OFF
key OFF recognition(SW0)
Port INT
Figure 18. Interrupt of switch operation (1)
SIN0(sensor ON/OFF）
key ON recognition(SW0)
key OFF recognition(SW0)
SIN1(sensor ON/OFF）
key ON recognition(SW1)
key OFF recognition(SW1)
Port INT
Send clear command for interrupt of SW0 ON
Send clear command for interrupt of SW0 OFF
Send clear command for interrupt of SW1 ON
Send clear command for interrupt of SW1 OFF
Figure 19. Interrupt of switch operation (2)
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14.Jul.2016 Rev.002