at42qt1070 ATMEL Corporation, at42qt1070 Datasheet - Page 33

• Manufacturer Part Number: at42qt1070
• Description: Qtouch 7-channel Sensor Ic
• Manufacturer: ATMEL Corporation

A.6
Figure 6-1.
9596A–AT42–10/10
SDA
SCL
START
Combining Address and Data Bytes into a Transmission
Byte Transmission
Addr MSB
1
Figure A-5.
A transmission consists of a START condition, an SLA+R/W, one or more data bytes 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.
Note: Each write or read cycle must end with a stop condition. When reading, a repeated
START is allowed. So S, SLA+W, A, S, SLA+R, A, DATA1, A,......,DATAx, /A, P can be sent.
Figure 6-1
between the SLA+R/W and the STOP.
2
SLA+R/W
SDA from
Transmitter
SDA from
Receiver
SCL from
Master
Aggregate
SDA
Addr LSB
shows a typical data transmission. Note that several data bytes can be transmitted
SLA+R/W
7
Data Byte Format
R/W
8
ACK
9
Data MSB
1
2
Data MSB
1
Data Byte
2
7
Data Byte
Data LSB
8
7
Data LSB
ACK
9
8
AT42QT1070
ACK
9
STOP or
Next Data Byte
STOP
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