BU21180FS datasheet(8/43 Pages) ROHM

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TSZ22111

• 15 • 001

BU21180FS

TSZ02201-0L5L0F300930-1-2

06.Aug.2018 Rev.002

Interface Specification

2-wire Serial Bus Interface

Compatible with I2C Protocol

Support Slave Mode Only

7bit Slave Address = 0x5C (in case of ADDR=L) / 0x5D (in case of ADDR=H)

Support Sequential Read

Support Clock Stretching

Figure 7. 2-wire Serial Bus Data Format

SDA

tLOW

tHD;STA

SCL

repeated

START

condition

tHD;DAT

tHIGH

tHD;STA

tSU;STA

tSU;DAT

tBUF

tSU;STO

STOP

condition

START

condition

START

condition

Figure 8. 2-wire Serial Bus Data Timing Chart

2-wire Serial Bus Interface Electrical Characteristics (Unless otherwise specified VDD=5.0V Ta=25°C)

Parameter

Symbol

Limit

Unit

Conditions

Min

Typ

Max

SCL Clock Frequency

fSCL

400

kHz

Hold Time (repeated) START

Condition

tHD;STA

0.6

µs

Low Period of the SCL Clock

tLOW

1.3

µs

High Period of the SCL Clock

tHIGH

0.6

µs

Data Hold Time

tHD;DAT

µs

Data Set-up Time

tSU;DAT

0.1

µs

Set-up Time for a Repeated

START Condition

tSU;STA

0.6

µs

Set-up Time for STOP Condition

tSU;STO

0.6

µs

Bus Free Time between STOP

and START Condition

tBUF

1.3

µs

SDA

SCL

START

1-7

Address

R/W

ACK

Data

ACK

Data

NACK

/ACK

STOP

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