BU21009MUV

Technical Note

10/13

www.rohm.com

2009.04 - Rev.B

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

【

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

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

F3h

SIN7

SIN6

SIN5

SIN4

SIN3

SIN2

SIN1

SIN0

F4h

SIN15

SIN14

SIN13

SIN12

SIN11

SIN10

SIN9

SIN8

R/W

W

W

W

W

W

W

W

W

Initial val.

1

1

1

1

1

1

1

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.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

F5h

LED7

LED6

LED5

LED4

LED3

LED2

LED1

LED0

R/W

W

W

W

W

W

W

W

W

Initial val.

1

1

1

1

1

1

1

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 2

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

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

F7h

-

ON2[6]

ON2[5]

ON2[4]

ON2[3]

ON2[2]

ON2[1]

ON2[0]

R/W

-

W

W

W

W

W

W

W

Initial val.

-

0

0

1

0

0

0

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

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

F8h

SIN7

SIN6

SIN5

SIN4

SIN3

SIN2

SIN1

SIN0

F9h

SIN15

SIN14

SIN13

SIN12

SIN11

SIN10

SIN9

SIN8

R/W

W

W

W

W

W

W

W

W

Initial val.

0

0

0

0

0

0

0

0