XE8000EV120 Semtech, XE8000EV120 Datasheet - Page 9

• Manufacturer Part Number: XE8000EV120
• Description: BOARD EVAL FOR SX8722I070TRLF
• Manufacturer: Semtech
• Series: ZoomingADC™r

Specifications of XE8000EV120

• Number Of Adc's: 1
• Number Of Bits: 16
• Data Interface: I²C
• Inputs Per Adc: 7 Single or 4 Differential
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Utilized Ic / Part: SX8722
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: XM8000EV120; XM8000EV120

ADVANCED COMMUNICATIONS & SENSING
3 Hardware description
The evaluation tool is composed of a main and an application board.
3.1 Boards features
3.2 Communication between PC, Gateway and SX8722
The communication protocol between the PC and the gateway is made of frame exchanges. A frame is
composed of a type, a size and a customized data buffer. There are 3 different types of frame: command
request frame, command response frame and data frame.
The command request frame is sent by the PC to the gateway. The command response frame is sent by the
gateway to the PC as a response to a command request. There is a command response sent for every
command request received.
The command request frame and command response frame are implied in the following procedure:
The data frame is used to send the measured value from the SX87xx ADC to the PC.
The data frame is implied in the following procedure:
© 2007 Semtech Corp.
1- PC sends a command request to the gateway via the UART.
2- The gateway will execute the command (using I2C connection with SX87xx).
3- The gateway will send a command response frame with the command result to the PC via the UART.
1- SX87xx validate its READY output.
2- The gateway fetches the ADC measured value (using I2C connection with SX87xx).
3- The gateway will send a data frame with the measured value to the PC via the UART.
XE8000EV120:
Application:
o
o
o
o
o
o
o
PC
Ease the access to every SX8722 pin.
Dedicated interfaces for connection to the external world.
USB interface for communication between the GUI and the chip.
Power supply flexibility (USB, battery, DC connector…).
User interface (LEDS, buttons…).
Holds the SX8722 and its mandatory components.
Can be used as a drop-in module on another application.
Cmd req
Cmd resp
Data
Figure 6 Hardware block diagram
UART
USB
to
Cmd req
Cmd resp
Data
9
Gateway
SX8722 Evaluation Tools XE8000EV120
Ready
I2C
SX87xx
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PRELIMINARY
Users Guide