BU21009MUV Datasheet, PDF (10/14 Pages) Rohm – Capacitive Sensor Switch Control IC

BU21009MUV
Technical Note
【F3h / F4h : Idle Exit Condition】
Name:
IDLE_CH
Address:
F3h / F4h
Description: Defines which channels cause the device to wake up – i.e.
go from idle mode to normal operation on a key press. Selection is made on a per channel basis.
1：Effective 0：Not used
F3h
F4h
R/W
Initial val.
Bit7
SIN7
SIN15
W
1
Bit6
SIN6
SIN14
W
1
Bit5
SIN5
SIN13
W
1
Bit4
SIN4
SIN12
W
1
Bit3
SIN3
SIN11
W
1
Bit2
SIN2
SIN10
W
1
Bit1
SIN1
SIN9
W
1
Bit0
SIN0
SIN8
W
1
【F5h : LED to Sensor Linkage】
Name:
LED_LINK
Address:
F5h
Description: Allows the LED outputs to be automatically linked to the input channels without need for any software control.
1 : It synchronizes with the button. 0 : It synchronizes with data (The register name: DLED) from host.
F5h
R/W
Initial val.
Bit7
LED7
W
1
Bit6
LED6
W
1
Bit5
LED5
W
1
Bit4
LED4
W
1
Bit3
LED3
W
1
Bit2
LED2
W
1
Bit1
LED1
W
1
Bit0
LED0
W
1
【F6h : Sampling Interval】
Name:
TIMES
Address:
F6h
Description: Defines the sampling interval.
SAMP[1:0] : Sampling Interval ：
Given by the following equation :
Sampling interval = system clock x 2¹³ x SAMP (Example: system clock 1[MHz] time : About 8.2[msec]).
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
F6h
-
-
-
-
-
-
SAMP[1] SAMP[0]
R/W
-
-
-
-
-
-
W
W
Initial val.
-
-
-
-
-
-
0
0
【F7h : Button OFF→ON Threshold】
Name:
TH_ON2
Address:
F7h
Description: A second threshold value for determining a button off→on judgment of sensor.
The sensor output value of 8bit (register SENS_DATA) is compared with 128+ ON2 [6:0],
and if it is larger, the button is determined active.
Bit7
F7h
-
R/W
-
Initial val.
-
Bit6
ON2[6]
W
0
Bit5
ON2[5]
W
0
Bit4
ON2[4]
W
1
Bit3
ON2[3]
W
0
Bit2
ON2[2]
W
0
Bit1
ON2[1]
W
0
Bit0
ON2[0]
W
0
【F8h / F9h : Button OFF→ON Threshold Selection】
Name:
TH_ON2_CH
Address:
F8h / F9h
Description: This register is used to relate either threshold TH_ON or TH_ON2 to particular sensor channels
for button press activity determination.
1 : TH_ON2 is applied 0 :TH_ON is applied
F8h
F9h
R/W
Initial val.
Bit7
SIN7
SIN15
W
0
Bit6
SIN6
SIN14
W
0
Bit5
SIN5
SIN13
W
0
Bit4
SIN4
SIN12
W
0
Bit3
SIN3
SIN11
W
0
Bit2
SIN2
SIN10
W
0
Bit1
SIN1
SIN9
W
0
Bit0
SIN0
SIN8
W
0
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© 2009 ROHM Co., Ltd. All rights reserved.
10/13
2009.04 - Rev.B