Technical Note

5/19

BH6456GUL

www.rohm.com

2012.02 - Rev.A

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

●

2 wire Serial Interface Action Timing Characteristics (Unless otherwise specified, Ta=-25 to +85°C, VCC=2.3 to 4.8V)

Parameter

Symbol

FAST-MODE

*6

STANDARD-MODE

*6

Unit

Min.

Typ.

Max.

Min.

Typ.

Max.

SCL frequency

fSCL

-

-

400

-

-

100

kHz

Data clock high time

tHIGH

0.6

-

-

4.0

-

-

μs

Data clock low time

tLOW

1.3

-

-

4.7

-

-

μs

Start condition hold time

tHD:STA

0.6

-

-

4.0

-

-

μs

Start condition setup time

tSU:STA

0.6

-

-

4.7

-

-

μs

Data hold time

tHD:DAT

0

-

0.9

0

-

3.45

μs

Data setup time

tSU:DAT

100

-

-

250

-

-

ns

Stop condition setup time

tSU:STO

0.6

-

-

4.0

-

-

μs

BUS release time

tBUF

1.3

-

-

4.7

-

-

μs

Noise removal valid period

tI

0

-

50

0

-

50

ns

The maximum bit transfer rates of 100 kbit/s for Standard-mode devices and 400 kbit/s for Fast-mode devices

This transfer rates is provided the maximum transfer rates, for example it is able to drive 100 kbit/s of clocks with Fast-mode.

●

2 wire Serial Interface Data timing

Fig.4 Serial data timing

Fig.5 Start stop bit timing

●

Recommend to power supply turning on operation timing

Parameter

Symbol

Recommendation limit

Unit

Min.

Typ.

Max.

PS input H voltage set-up time

TPS

1

-

-

us

2-wire serial interface input data set-up

time

tI2C

1

-

-

us

●

Sequence of data input timing to power supply

SCL

tBUF

SDA

tHD : STA

tSU : DAT

tR

tF

tHD : DAT

tHIGH

tLOW

SCL

START BIT

SDA

STOP BIT

tSU : STA

tHD : STA

tSU : STO

VCC,VM

PS

2-wire serial input

tPS

tI2C

50%

50%

50%

Serial data