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TSZ02201-0K1K0B601860-1-2

© 2016 ROHM Co., Ltd. All rights reserved.

6. Oct.2016 Rev.003

www.rohm.com

TSZ22111・15・001

BU64985GWZ

Characteristics of the SDA and SCL Bus Lines for 2-wire Serial Interface

(Ta = 25 °C, VDD = 1.6 to 1.98V)

Parameter

Symbol

STANDARD-

Unit

Min

Max

Min

Max

Min

Max

Hysterics of Schmitt trigger inputs

Vhys

-

-

0.05VDD

-

0.05VDD

-

V

Pulse width of spikes which must be suppressed

by the input filter

tSP

0

50

0

50

0

50

ns

Hold time (repeated) START condition. After this

period, the first clock pulse is generated

tHD;STA

4.0

-

0.6

-

0.26

-

µs

LOW period of the SCL clock

tLOW

4.7

-

1.3

-

0.5

-

µs

High period of the SCL clock

tHIGH

4.0

-

0.6

-

0.26

-

µs

Set-up time for repeated START condition

tSU;STA

4.7

-

0.6

-

0.26

-

µs

Data hold time

tHD;DAT

0

3.45

0

0.9

0

0.45

µs

Data set-up time

tSU;DAT

250

-

100

-

50

-

ns

Set-up time for STOP condition

tSU;STO

4.0

-

0.6

-

0.26

-

µs

Bus free time between a STOP and START

condition

tBUF

4.7

-

1.3

-

0.5

-

µs

(Note 4) STANDARD-MODE, FAST-MODE, and FAST-MODE PLUS (Fm+) 2-wire Serial Interface devices must be able to transmit or receive at the designated speed.

The maximum bit transfer rates are 100 kbit/s for STANDARD-MODE devices, 400 kbit/s for FAST-MODE devices, and 1 Mbit/s for Fm+ devices.This transfer rates is

based on the maximum transfer rate. For example the bus is able to drive 100 kbit/s clocks with Fm+.

2-wire Serial Interface Timing

Figure 5. Serial Data Timing

Figure 6. START and STOP Bit Timing

Register

Name

Setting

Item

Description

Initial

Value

R/W

Read/Write

Setting

0 = Write to serial registers, 1 = Read from serial registers

0

PS

Serial

Power

Save

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

0

EN

Enable

0 = Output current set to zero & idling current set to zero,

1 = Constant current drive

0

W2W1W0

Register

Address

000 =

Don’t care

0x0

001 =

Don’t care

010 = Target position DAC code [D9:D0]

011 = Reference DAC code [D7:D0]

100 = Actuator resonance frequency[D7:D3], Slew rate [D1:D0]

101 = ISRC setting

– point A [D9:D0]

110 = ISRC setting

– point B [D9:D0]

111 = Step resolution [D7:D5], Step time[D4:D0]

M

Mode

Select

Signal

0 =

Direct mode, 1 = ISRC or Step mode

0

D9 to D0

10-bit Data

Setting

10-bit data programmed to the corresponding register address

0x200

SCL

tBUF

SDA

tHD : STA

tSU : DAT

tHD : DAT

tHIGH

tLOW

SCL

START BIT

SDA

STOP BIT

tSU : STA

tHD : STA

tSU : STO