Technical Note

2/11

BU9796FS

www.rohm.com

2009.05 - Rev.A

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

●Electrical Characteristics

Parameter

Symbol

Limit

Unit

Condition

MIN

TYP

MAX

“H” level input voltage

VIH

0.7VDD

-

VDD

V

“L” level input voltage

VIL

VSS

-

0.3VDD

V

“H” level input current

IIH

-

-

1

uA

“L” level input current

IIL

-1

-

-

uA

LCD Driver

on resistance

SEG

RON

-

3

-

k

Ω

Iload=±10uA

COM

RON

-

3

-

k

Ω

VLCD supply voltage

VLCD

0

-

VDD-2.4

V

VDD-VLCD≧2.4V

Standby current

IDD1

-

-

5

uA

Display off, Oscillation off

Power consumption

IDD2

-

12.5

30

uA

VDD=3.3V, VLCD=0V, Ta=25degree

Power save mode SR = Power save mode1,

Power save mode FR = Power save mode1

1/3 bias, Frame inverse

Frame frequency

fCLK

56

80

104

Hz

Power save mode FR = Normal mode

MPU interface Characteristics (VDD=2.5～5.5V, VLCD=0V, VSS=0V, Ta=-40～85degree, unless otherwise specified)

Parameter

Symbol

Limit

Unit

Condition

MIN.

TYP.

MAX.

Input rise time

tr

-

-

0.3

us

Input fall time

tf

-

-

0.3

us

SCL cycle time

tSCYC

2.5

-

-

us

“H” SCL pulse width

tSHW

0.6

-

-

us

“L” SCL pulse width

tSLW

1.3

-

-

us

SDA setup time

tSDS

100

-

-

ns

SDA hold time

tSDH

100

-

-

ns

Buss free time

tBUF

1.3

-

-

us

START condition hold time

tHD;STA

0.6

-

-

us

START condition setup time

tSU;STA

0.6

-

-

us

STOP condition setup time

tSU;STO

0.6

-

-

us

Fig. 1 interface timing

SDA

SCL

SDA