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Datasheet

Datasheet

BU21072MUV / BU21078MUV

TSZ02201-0Y2Y0FZ00020-1-2

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

12.Mar.2012 Rev.001

www.rohm.com

TSZ22111・15・001

S

T

A

R

T

W

R

I

T

E

A

C

K

A

C

K

A

C

K

S

T

O

P

S S S S S S S

RRR RR RRR

W W W W W W W W

AA AA AA A

A A A AA AA A

D D D D D D D D

65 432 10

7 6 5 4 3 210

7 654 32 10

S

T

A

R

T

W

R

I

T

E

A

C

K

A

C

K

S

T

A

R

T

R

E

A

D

A

C

K

N

A

C

K

S

T

O

P

S S S S S S S

RRR RR RRR

S S S S S S S

R RR RR RRR

AA AA AA A

A A A AA AA A

A A A A A AA

D D D D D D D D

65 432 10

7 6 5 4 3 210

654 32 10

7 6 5 432 10

S

T

A

R

T

W

R

I

T

E

A

C

K

A

C

K

S

T

A

R

T

R

E

A

D

A

C

K

A

C

K

A

C

K

N

A

C

K

S

T

O

P

S S S S S S S

RRR RR RRR

S S S S S S S

R RR RR RRR

R

R

R R R RRR RR

AA AA AA A

A A A AA AA A

A A A A A AA

D D D D D D D D

D

D

D D D D D D D D

65 432 10

7 6 5 4 3 210

654 32 10

7 6 5 432 10

7

0

7 654 32 10

Read Data

from Register

(Register Address

= n+x)

Slave Address

=0x5C

(BU21072MUV)

=0x5D

(BU21078MUV)

Slave Address

=0x5C

(BU21072MUV)

=0x5D

(BU21078MUV)

Register Address

(n)

Slave Address

=0x5C

(BU21072MUV)

=0x5D

(BU21078MUV)

Read Data

from Register

(Register Address

= n)

Write Data

to Register

(Register Address

= n)

Register Address

(n)

Read Data

from Register

(Register Address

= n)

Slave Address

=0x5C

(BU21072MUV)

=0x5D

(BU21078MUV)

Slave Address

=0x5C

(BU21072MUV)

=0x5D

(BU21078MUV)

Register Address

(n)

●Scan rate

After scan each sensor in time series, MPU convert to the switch operations from the detected results. The number of

sensor ports is difference between BU21072MUV and BU21078MUV, but one scan rate is the same. One scan rate is

about 16msec at typical.

Fig.11 Timing chart of scan rate

Fig.10 2-wire serial bus protocol

BU21072MUV

BU21078MUV

●Sequential Read

●Random Read

●Byte Write

SIN9 is

nonexistent on

BU21078MUV.

SIN8 is the same

above.

SIN13 and

SIN14 are

nonexistent on

BU21072MUV.

SIN11 and

SIN12 are the

same above.

SA : Slave Address

RA : Register Address

RD : Read Data

WD : Write Data