Datasheet

Datasheet

7/20

BU64241GWZ

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

01. Jul. 2013 Rev.004

www.rohm.com

TSZ22111・15・001

TSZ02201-0H2H0B600460-1-2

●2-wire serial BUS Format (Fast mode SCL = 400 kHz)

●Register Update Timing

PS – Register is updated during the 2

EN – Register is updated during the 3

Wx – Register is updated during the 2

M – Register is updated during the 3

Dx – Register is updated during the 3

Note: Setting the external power save pin = VPSL (typically 0 V) will reset all 2-wire serial registers to 0

Register name

Setting item

Description

R/W

Read/Write mode

0 = Write mode (0x18 address), 1 = Read mode (0x19 address)

PS

Serial power save

0 = Driver in standby mode, 1 = Driver in operating mode

EN

Driver output status

0 = Output is Hi-Z

1 = Constant current sink/sequence start

M

Mode select

M=0=ISRC mode disabled

M=1=ISRC mode enabled

W2W1W0

Register address

000b = Output current setting

001b = Parameter setting 1

010b = Parameter setting 2

011b = Parameter setting 3

100b = Parameter setting 4

D9 to D0

Data bits

Register data

Write mode（R/W = 0)

Output from Master

Output from Slave

S

00

Read mode

S

00

011000

※※ A

S

00

011001

S : start signal

P : stop signal

A : acknowledge

nA : non acknowledge

※ : Don't care

Update

Read

Write

Update W (register address)