Texas Instruments ADS1232REF, User Manual, Page: 20 / 30

USB-SERIAL
INTERFACE
POWER
SUPPLY
LOAD CELL
CONNECTORS
INPUT
FILTERING
TO TERMINAL
BLOCK
MSP430F449
USB CONNECTOR
LCD SWITCHES
ADS1232
+5V
+3.3V
CH2
CH1
SPI
GPIO
UART
Hardware
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5.2.6 D — Collect One Sample
Issuing the D command causes the ADS1232REF to report the latest collected sample from the ADS1232.
The sample is displayed in raw hexadecimal.
5.2.7 C — Set Channel
This command sets the desired channel of the ADS1232 programmable gain amplifier in the following
manner:
• C0 — sets input to channel AIN1
• C1 — sets input to channel AIN2
• CT — sets input channel to specified temperature
•
C
—
(with no arguments) provides the current channel setting
5.2.8 Q
—
Query Parameters
Q causes the ADS1232REF to issue a coded string summarizing the current settings. The format of the
string is:
P[0-3]R[F,S]OIC[0,1,T]
followed by a carriage-return and linefeed.
6 Hardware
A block diagram of the ADS1232REF is shown in Figure 8 . The schematic and layout drawings are given
in Section A.2 at the end of this document.
Figure 8. ADS1232REF Hardware Block Diagram
6.1 Microcontroller
The ADS1232REF uses the MSP430F449 microcontroller. This device provides an LCD controller,
hardware SPI and UART interfaces, and a multiplier. The latter is important because the firmware must
perform many multiplications.
20 ADS1232REF User ' s Guide SBAU120B – November 2005 – Revised July 2011
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