XE8000EV121 Semtech, XE8000EV121 Datasheet - Page 14

• Manufacturer Part Number: XE8000EV121
• Description: BOARD EVAL FOR SX8723/24
• Manufacturer: Semtech

Specifications of XE8000EV121

• Main Purpose: Interface, Sensor to ADC Interface, Programmable
• Embedded: No
• Utilized Ic / Part: SX8723, SX8724, SX8725
• Primary Attributes: Signal Conditioning for Bridge-Type Sensors
• Secondary Attributes: GUI, Up to 16-Bit, Programmable Gain of 1/12 ~ 1000, I2C Interface
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADVANCED COMMUNICATIONS & SENSING
2-WIRE
The 2-WIRE interface gives access to the chip registers. It complies with the 2-WIRE protocol specifications,
restricted to the slave side of the communication.
General features:
The interface handles 2-WIRE 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.
2-WIRE Communication Format
2-WIRE Address
The default 2-WIRE slave address is 1001000 in binary.
This is the standard part 2-WIRE slave address. Other addresses between 1001001 and 1001111 are available
by special request.
V1.8 © 2009 Semtech Corp.
Ready
Ready
SDA
SCL
SDA
SDA
SDA
SCL
SCL
SCL
...
...
Start
Start
Start
Start
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 2-WIRE clock SCL only before sending ACK/NACK
1
1
1
1
1
1
1
1
0
0
0
0
Master
Master
Master
Slave Address
Slave Address
Slave Address
Slave Address
0
0
0
0
Master
1
1
1
1
Figure 7 - Timing Diagram for Reading an ADC Sample from SX8725
0
0
0
0
0
0
0
0
0
0
0
0
Figure 5 - Timing Diagram for Reading from SX8725
Figure 6 - Timing Diagram for Writing to the SX8725
W
W
W
W
0
0
0
0
SX8725
SX8725
SX8725
SX8725
ACK
ACK
ACK
ACK
9
9
0
9
0
0
9
0
A7
A7
1
1
0
1
1
0
A6
A6
1
1
A5
A5
0
0
Memory Address
Memory Address
RegACOutMsb
RegACOutLsb
ZoomingADC™ for Pressure and Temperature Sensing
A4
A4
1
1
Master
Master
Master
Master
A3
A3
0
0
A2
A2
0
0
A1
A1
0
0
A0
A0
1
0
SX8725
SX8725
SX8725
SX8725
ACK
ACK
ACK
ACK
9
9
9
9
14
Start
Start
Start
Start
1
1
1
1
1
1
1
1
0
0
0
0
Slave Address
Slave Address
Slave Address
0
Slave Address
0
0
Master
0
Master
Master
Master
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
R
W
R
R
1
0
1
1
SX8725
ACK
ACK
ACK
ACK
9
9
9
9
D7
D7
D7
D7
1
1
1
1
D6
D6
D6
D6
D5
D5
D5
D5
SX8725
SX8725
SX8725
D4
D4
D4
D4
Master
Data
Data
Data
Data
D3
D3
D3
D3
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D2
D2
D2
D2
D1
D1
D1
D1
D0
D0
D0
D0
SX8725
SX8725
NACK Stop
NACK Stop
NACK Stop
ACK Stop
9
9
9
9
Master
Master
Master
Master
...
...