USB-SERIAL

INTERFACE

POWER

SUPPLY

LOAD CELL

CONNECTORS

INPUT

FILTERING

MSP430F449

USB CONNECTOR

LCD

SWITCHES

ADS1x31

+5V

+3.3V

CH1

SPI

GPIO

UART

Hardware

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5.2.4

S

—Start Streaming

When S is issued, the ADS1x31REF begins printing raw output codes from the installed ADS device in

hexadecimal format, separated by new lines. The device iterates continuously until a character is received

from the serial port.

S is used primarily by the EVM software for data collection.

5.2.5

D

—Collect One Sample

Issuing the D command causes the ADS1x31REF to report the latest collected sample from the installed

ADS device. The sample is displayed in raw hexadecimal.

5.2.6

C

—Set Channel

This command has no effect on the installed ADS device because there is only one channel.

•

C0

—set to channel 0

•

C

—(with no arguments) prints the current channel, always CHAN=0

5.2.7

Q

—Query Parameters

Q causes the ADS1x31REF to issue a coded string summarizing the current settings. The format of the

string is:

P0R[F,S]OIC0

followed by a carriage-return and linefeed.

6

Hardware

A block diagram of the ADS1x31REF is shown in Figure 8. The schematic and layout drawings are given

in Appendix A.

Figure 8. ADS1x31REF Hardware Block Diagram

20

ADS1131REF and ADS1231REF

SBAU175A

– July 2010 – Revised August 2011

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