BU2050F,BU2092F,BU2092FV,BU2099FV,BD7851FP,BU2152FS

Technical Note

15/24

www.rohm.com

2009.06 - Rev.A

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

【

BD7851FP】

●

Pin descriptions

Pin No.

Pin Name

Function

1

GND

Ground

2

R_Iref

Reference Current Output Current setting

3

LATCH

Latch Signal Input

4

S_IN

Serial Data Input

5～15

OUT16

～

OUT6

Reference Current Output

16

P_GND

Ground for Driver

17～21

OUT5

～

OUT1

Reference Current Output

22

SOUT

Serial Data Output

23

CLOCK

Clock Input

24

ENABLE

ENABLE

25

●

Timing chart

Fig. 12

1.

After the power is turned on and the voltage is stabilized, LATCH should be activated, after clocking 16 data bits

into the S_IN terminal.

2.

OUTn parallel output data of the shift register is set after the 16

3.

The final stage data of the shift register is outputted to the SOUT by synchronizing with the rise time of the

CLOCK.

4.

Since the LATCH is a label latch, data is retained in the “L” section and renewed in the “H” section of the LATCH.

5.

Data retained in the internal latch circuit is outputted when the ENABLE is in the “L” section. When the ENABLE

is in the “H” section, data is fixed in the “H” section.

CLOCK

LATCH

S_IN

DATA16

DATA15

DATA14

DATA2

DATA1

OUTn

Previous DATA

DATA

SOUT

Previous

DATA15

Previous

DATA14

Previous

DATA2

DATA16

Previous

DATA1

DATA15

DATA14

ENABLE