BU1840AMUV-E datasheet(3/17 Pages) ROHM

No de pièce	BU1840AMUV-E

Description	For 2Cell Solar,Synchronous Switch-Mode Charger IC

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Fabricant	ROHM [Rohm]

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Datasheet

.

3/14

BU1840AMUV

TSZ02201-0Q1Q0AJ00130-1-2

2.AUG.2012 Rev.001

TSZ22111・15・001

www.rohm.com

●

Electrical characteristics (Unless otherwise specified: Ta=25℃, VIO=1.8V)

Item

Symbol

Min.

Typ.

Max.

Unit

Conditions

【

I

2C input (SDA, SCL)】

L level input voltage

VIL1

-0.3

-

0.25 ×

VIO

V

H level input voltage

VIH1

0.75 ×

VIO

-

VIO

+0.3

V

Hysteresis width

Vhys1

0.05 ×

VIO

-

V

L level output voltage

(Sink current = 3mA)

VOL1

0

-

0.3

V

SDA pin

Input current

Iin1

-3

-

3

μ

A

Pin voltage=0～VIO

●

I

2C BUS format

The writing/reading operation is based on the I

2C slave standard.

・

Slave address

A7

A6

A5

A4

A3

A2

A1

R/W

1

0

1

1/0

・

Bit Transfer

SCL transfers 1-bit data during H. SCL cannot change

signal of SDA during H at the time of bit transfer. If SDA

changes while SCL is H, START conditions or STOP

conditions will occur and it will be interpreted as a

control signal.

・

START and STOP condition

When SDA and SCL are H, data is not transferred on

the I

2C- bus. This condition indicates, if SDA changes

from H to L while SCL has been H, it will become START

(S) conditions, and an access start, if SDA changes from

L to H while SCL has been H, it will become STOP (P)

conditions and an access end.

・

Acknowledge

It transfers data 8 bits each after the

occurrence

of

START

condition.

A

transmitter opens SDA after transfer 8bits

data,

and

a

receiver

returns

the

acknowledge signal by setting SDA to L.

・

Protocol

SDA

SCL

SDA a state of stability：

Data are effective

SDA

It can change

SDA

SCL

SP

START condition

STOP condition

12

89

DATA OUTPUT

BY TRANSMITTER

DATA OUTPUT

BY RECEIVER

acknowledge

not acknowledge

S

START condition

clock pulse for

acknowledgement

SCL

A

S

P

The mastering side is a transmitter.

The slave side is a receiver.

The slave side is a transmitter.

The mastering side is a receiver.

Unacknowledged

Acknowledge

Stop condition

Start condition

Sr Repetition start condition

Legend

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