Technical Note

3/15

BU9795AKV, BU9795AFV, BU9795AGUW

www.rohm.com

2009.07 - Rev.B

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

●Electrical characteristics

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

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

-

3.5

-

k

Ω

Iload=±10uA

COM

RON

-

3.5

-

k

Ω

VLCD supply voltage

VLCD

0

-

VDD -2.4

V

VDD-VLCD≧2.5V

Standby current

Ist

-

-

5

uA

Display off, Oscillator off

Power consumption 1

IDD1

-

12.5

30

uA

VDD=3.3[V], Ta=25,

Power save mode1, FR=70Hz

1/3 bias, Frame inverse

Power consumption 2

IDD2

-

20

40

uA

VDD=3.3[V], Ta=25,

Normal mode, FR=80Hz

1/3 bias, Line inverse

● Oscillation Characteristics

(VDD=2.5～5.5V,VSS=0V, Ta=-40～85degree)

Parameter

Symbol

Limit

Unit

Condition

MIN

TYP

MAX

Frame frequency

56

80

104

Hz

FR = 80Hz setting

Frame frequency1

70

80

90

Hz

VDD=3.5V, 25degree

● MPU interface Characteristics

(VDD=2.5V～5.5V,VSS=0V, Ta=-40～85degree)

Parameter

Symbol

Limit

Unit

Condition

MIN

TYP

MAX

Input rise time

tr

-

-

80

ns

Input fall time

tf

-

-

80

ns

SCL cycle time

tSCYC

400

-

-

ns

“H” SCL pulse width

tSHW

100

-

-

ns

“L” SCL pulse width

tSLW

100

-

-

ns

SD setup time

tSDS

20

-

-

ns

SD hold time

tSDH

50

-

-

ns

CSB setup time

tCSS

50

-

-

ns

CSB hold time

tCSH

50

-

-

ns

“H” CSB pulse width

tCHW

50

-

-

ns

Fig.1 3wire Serial timing waveform

tCHW

CSB

SCL

SD

tCSH

tSCYC

tSLW

tSHW

tSDS

tSDH

tf

tr

tCSS