TTP239

2016/3/7

Page 11 of 16

Version：1.1

from master

NOT ACK

Stop

from slave

ACK

Start

Slave Address

Data_0

B0

B1

B2

B3

B4

B5

B6

B7

R

A0

Note : Data_0 : B7~B0 are TP0~TP7 on/off status. 0 is key off, 1 is key on.

Figure 7-2-1. Read Operation Sequence

START

Condition

P

STOP condition

Change

Data

Data or

ACK Valid

SCL

S

SDA

Figure 7-2-2. Data Transmission Sequence

Condition

STOP

ACK

P

9

Condition

START

DATA

ACK

R/W

ADDRESS

S

8

1 - 7

9

8

1 - 7

SCL

SDA

Figure 7-2-3. A complete data transfer

BUF

t

SU;STO

r

t

r

t

t

HD;STA

t

SU;STA

t

f

t

f

t

SU;DAT

t

HIGH

t

HD;STA

t

HD;DAT

t

LOW

t

S

P

Sr

S

SCL

SDA