BU21010MUV

Technical Note

9/14

www.rohm.com

2009.04 - Rev.B

© 2009 ROHM Co., Ltd. All rights reserved.

【

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]

… G_DIV = 0

1 / ( ( Internal oscillation frequency) / ( 2 * 16 * 16 ) * 2 [sec]

… G_DIV = 1

1 / ( ( Internal oscillation frequency) / ( 2 * 16 * 16 ) * 4 [sec]

… G_DIV = 2

1 / ( ( Internal oscillation frequency) / ( 2 * 16 * 16 ) * 8 [sec]

… G_DIV = 3

Gesture maximum judgment time＝（Gesture sampling interval） * TO * 16 [sec]

For example with an internal clock of 1.1MHz

G_DIV

Gesture sampling interval[msec]

Gesture maximum judgment time [sec]

0

0.46

1.90

1

0.93

3.81

2

1.86

7.62

3

3.72

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]

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

E5h

TO[7]

TO[6]

TO[5]

TO[4]

TO[3]

TO[2]

TO[1]

TO[0]

R/W

W

W

W

W

W

W

W

W

Initial val.

1

1

1

1

1

1

1

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

Bit1

Bit0

EFh

-

-

-

-

-

-

-

DONE

R/W

-

-

-

-

-

-

-

W

Initial val.

-

-

-

-

-

-

-

0