BU21025GUL

TSZ02201-0Y2Y0F300050-1-2

© 2012 ROHM Co., Ltd. All rights reserved.

7.AUG.2012 Rev.002

www.rohm.com

TSZ22111・15・001

5/15

Datasheet

Datasheet

Command Byte

BU21025GUL has a command byte after the address byte. Upper 4 bits of the command byte select an operation code. And

lower 4 bits of the command byte select an operand. Effects of the operands are changed by the operation code.

Table 2. Command Byte

BIT

MSB

7

6

5

4

3

2

1

LSB

0

NAME

C3

C2

C1

C0

O3

O2

O1

O0

BIT 7-4 : C3-0

Operation code:

It is select an operation of the command. Detail is shown in Table 3.

BIT 3-0 : O3-0

Operand:

It has 3 types. The operand type is selected by the operation code. When the operation

code is not “0101” or “1011”, the option type is 0. When it is “1011”, the option type is 1.

When it is “0101” option type is 2. Detail is shown in Table 3 and 4.

Table 3. Operation Code Function

C3

C2

C1

C0

FUNCTION

AD-INPUT

X-DRIVER

Y-DRIVER

INT

POLARITY

OPERAND

TYPE

0

0

0

0

Set Power

OFF

OFF

OFF

H

0

0

0

0

1

Reserved

-

-

-

-

-

0

0

1

0

Measure AUX

AUX

OFF

OFF

H

0

0

0

1

1

Reserved

-

-

-

-

-

0

1

0

0

Set Power

OFF

OFF

OFF

H

0

0

1

0

1

Software Reset

OFF

OFF

OFF

H

2

0

1

1

0

Reserved

-

-

-

-

-

0

1

1

1

Reserved

-

-

-

-

-

1

0

0

0

Drive X

OFF

ON

OFF

L

0

1

0

0

1

Drive Y

OFF

OFF

ON

L

0

1

0

1

0

Drive Z

OFF

XN-ON

YP-ON

L

0

1

0

1

1

Setup

Keep

Keep

Keep

Keep

1

1

1

0

0

Measure X

YP

ON

OFF

L

0

1

1

0

1

Measure Y

XP

OFF

ON

L

0

1

1

1

0

Measure Z1

YN

XN-ON

YP-ON

L

0

1

1

1

1

Measure Z2

XP

XN-ON

YP-ON

L

0

Set Power (0000, 0100)

This code is used for returning to a state for touch detection without A/D conversion after sending screen drive command.

After this command, A/D converted data is set to 0.

Software Reset (0101)

BU21025GUL resets an A/D converted data, setup settings, and state of analog blocks to the initial state. If BU21025GUL

receives this code during an A/D conversion, the A/D conversion is stopped.

Drive X (1000), Drive Y (1001), Drive Z (1010)

BU21025GUL starts driving screen voltage by each code. PD is not effective. So, Driving is continuous until reserving

another command that changes state of driving screen voltage.

Measure AUX (0010), Measure X (1100), Measure Y (1101), Measure Z1 (1110), Measure Z2 (1111)

BU21025GUL starts driving screen voltage and A/D conversion. A PD of operand set,state of BU21025GUL after A/D

conversion is finished.

Setup (1011)

The setup command has a special operand (type is 1). The operand has MAF and pull-up resistor settings. Detail is

shown in Table 4.