BU21010MUV Datasheet, PDF (9/15 Pages) Rohm – Capacitive Sensor Switch Control IC

BU21010MUV
Technical Note
【E4h : Gesture Clock Setting】
Name:
GES_CLK
Address:
E4h
Description: This register allows setting of the time base for the gesture detection.
It sets a divide ratio of the clock used.
The maximum judgment time and the sampling interval of the gesture can be set by changing this clock.
Gesture sampling interval =
1 / ( ( Internal oscillation frequency) / ( 2 * 16 * 16 ) * 1 [sec]
1 / ( ( Internal oscillation frequency) / ( 2 * 16 * 16 ) * 2 [sec]
1 / ( ( Internal oscillation frequency) / ( 2 * 16 * 16 ) * 4 [sec]
1 / ( ( Internal oscillation frequency) / ( 2 * 16 * 16 ) * 8 [sec]
… G_DIV = 0
… G_DIV = 1
… G_DIV = 2
… G_DIV = 3
Gesture maximum judgment time＝（Gesture sampling interval） * TO * 16 [sec]
For example with an internal clock of 1.1MHz
G_DIV
0
1
2
3
Gesture sampling interval[msec]
0.46
0.93
1.86
3.72
Gesture maximum judgment time [sec]
1.90
3.81
7.62
15.2
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
E4h
-
-
-
-
-
-
G_DIV[1] G_DIV[0]
R/W
-
-
-
-
-
-
W
W
Initial val.
-
-
-
-
-
-
1
0
【E5h : Gesture Timeout Data Setting】
Name:
GES_TIMEOUT
Address:
E5h
Description: The maximum judgment time of the gesture is set.
A key sequence which exceeds this time is not recognized.
Gesture Maximum Judgment Time＝（Gesture sampling interval） * TO * 16 [sec]
E5h
R/W
Initial val.
Bit7
TO[7]
W
1
Bit6
TO[6]
W
1
Bit5
TO[5]
W
1
Bit4
TO[4]
W
1
Bit3
TO[3]
W
1
Bit2
TO[2]
W
1
Bit1
TO[1]
W
1
Bit0
TO[0]
W
1
【EEh : Soft Calibration】
Name:
CALIB
Address:
EEh
Description: This forces a chip re-calibration when a 1 is written and returns to 0 afterward automatically.
Please note that one should always re-calibrate after changing the gain adjustment value.
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
EEh
-
-
-
-
-
-
-
CALIB
R/W
-
-
-
-
-
-
-
W
Initial val.
-
-
-
-
-
-
-
0
【EFh : Setting Done, Detect Start】
Name:
DONE
Address:
EFh
Description: This register should be written to following register updates.
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
EFh
-
-
-
-
-
-
R/W
-
-
-
-
-
-
Initial val.
-
-
-
-
-
-
Bit1
Bit0
-
DONE
-
W
-
0
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9/14
2009.04 - Rev.B