QT60240-ATG Datasheet, PDF (16/26 Pages) List of Unclassifed Manufacturers – 16 AND 24 KEY QMATRIX TOUCH SENSOR ICs

5.6 Combining Address and Data Packets
Into a Transmission
A transmission consists of a START condition, an SLA+R/W,
one or more data packets and a STOP condition. The
wired-ANDing of the SCL line is used to implement
handshaking between the host and the device. The device
extends the SCL low period by pulling the SCL line low
whenever it needs extra time for processing between the data
transmissions.
Figure 5.6 shows a typical data transmission. Note that
several data bytes can be transmitted between the SLA +R/W
and the STOP.
Aggregate
SDA
SDA from
Transmitter
SDA from
Receiver
SCL from
Master
SLA+R/W
Figure 5.5 Data Packet Format
Data MSB
Data LSB ACK
1
2
7
8
9
Data Byte
STOP,
or
Next Data Byte
SDA
Addr MSB
Figure 5.6 Packet Transmission
Addr LSB R/W ACK
Data MSB
Data LSB ACK
SCL
START
1
2
7
8
9
SLA+R/W
1
2
7
8
9
Data Byte
STOP
lQ
16
QT60240-ISG R8.06/0906