SX8723 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SX8723' PDF : 53 Pages View PDF
SX8723
ZoomingADC™ for Pressure and Temperature Sensing
ADVANCED COMMUNICATIONS & SENSING
I2C
The I2C interface gives access to the chip registers. It complies with the I2C protocol specifications, restricted to
the slave side of the communication.
General features:
• Slave only operation
• Fast mode operation (up to 400 kHz)
• Combined read and write mode support
• General call reset support
• 7-bit device address customization
• Stretch I2C clock SCL only before sending ACK/NACK
The interface handles I2C communication at the transaction level: the processor is only aware of read and writes
transactions. A read transaction is an external request to get the content of system memory location and a write
transaction is an external request to write the content of a system memory location.
I2C Communication Format
Start
Slave Address
W ACK
Memory Address
ACK Start
Slave Address
R ACK
Data
NACK Stop
SDA
1 0 0 1 0 0 0 0 0 A7 A6 A5 A4 A3 A2 A1 A0
10 0 10 0 0 1
D7 D6 D5 D4 D3 D2 D1 D0
SCL
1
Master
91
SX8723
Master
9
SX8723
1
Master
91
SX8723
9
Master
Figure 5 - Timing Diagram for Reading from SX8723
Start
Slave Address
W ACK
Memory Address
ACK Start
Slave Address
W ACK
Data
ACK Stop
SDA
SCL
SDA
SCL
Ready
SDA ...
SCL ...
Ready
1 0 0 1 0 0 0 0 0 A7 A6 A5 A4 A3 A2 A1 A0
10 0 10 0 0 0
D7 D6 D5 D4 D3 D2 D1 D0
1
Master
91
SX8723
Master
9
SX8723
1
Master
91
SX8723
Master
Figure 6 - Timing Diagram for Writing to the SX8723
9
SX8723
Master
Start
Slave Address
W ACK
RegACOutMsb
ACK Start
Slave Address
R ACK
Data
NACK Stop
10010000 001010001
10 0 10 0 0 1
D7 D6 D5 D4 D3 D2 D1 D0
...
...
1
91
9
1
91
9
Start
Master
Slave Address
SX8723
W ACK
Master
RegACOutLsb
SX8723
ACK Start
Master
Slave Address
R ACK
SX8723
Data
Master
NACK Stop
100 1000000101 0000
100 10001
D7 D6 D5 D4 D3 D2 D1 D0
1
91
9
1
91
9
Master
SX8723
Master
SX8723
Master
SX8723
Master
Figure 7 - Timing Diagram for Reading an ADC Sample from SX8723
I2C Address
The default I2C slave address is 1001000 in binary.
This is the standard part I2C slave address. Other addresses between 1001001 and 1001111 are available by
special request.
V1.5 © 2007 Semtech Corp.
14
www.semtech.com
Share Link: 
