LowBit

(Logic0)

HighBit

(Logic1)

t

Low

t

High

t

LOW

t

High

EasyScaleTiming,withoutacknowledgeRFA =0

DA7

0

t

Start

StaticHigh

StaticHigh

DATA IN

t

Start

T

EOS

T

EOS

DA0

0

RFA

0

D0

1

AddressByte

DATA Byte

EasyScaleTiming,withacknowledgeRFA =1

StaticHigh

t

ACKN

Acknowledge

true,DataLine

pulleddownby

device

DATA IN

DATA OUT

Acknowledge

false,nopull

down

Controllerneedsto

PullupDataLineviaa

resistortodetect ACKN

ACKN

DA7

0

StaticHigh

T

EOS

t

valACK

DA0

0

RFA

1

D0

1

t

Start

t

Start

AddressByte

DATA Byte

TPS61165

SLVS790A – NOVEMBER 2007 – REVISED MAY 2010

www.ti.com

Table 2. EasyScale™ Bit Description (continued)

BIT

TRANSMISSION

BYTE

NAME

DESCRIPTION

NUMBER

DIRECTION

7 (MSB)

RFA

Request for acknowledge. If high, acknowledge is applied by device

6

A1

0 Address bit 1

5

A0

0 Address bit 0

4

D4

Data bit 4

Data byte

IN

3

D3

Data bit 3

2

D2

Data bit 2

1

D1

Data bit 1

0 (LSB)

D0

Data bit 0

Acknowledge condition active 0, this condition will only be applied in case RFA bit is

set. Open drain output, Line needs to be pulled high by the host with a pullup

ACK

OUT

resistor. This feature can only be used if the master has an open drain output stage.

In case of a push pull output stage Acknowledge condition may not be requested!

Figure 15. EasyScale™— Bit Coding

12

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