Application Report
SLAA234 – February 2005
Interfacing Low Power Serial (SPI) ADCs to the
MSP430F449
Carlos Muzzarelli ................................................................... Data Acquisition - Digital/Analog Converters
ABSTRACT
This application report discusses the serial peripheral interface (SPI) implementation of
a data acquisition system featuring the following devices: TLV2541, TLC2551,
TLC3541, and TLC4541. These analog-to-digital converters (ADC) offer options for
users ranging from extremely low power and wide voltage supply range to fast
conversion throughput. All devices share a small (MSOP) footprint and are pin-for-pin
compatible for easy upgrading. In this application report, SPI interface code examples
from the MSP430F449 to each ADC are presented. Using the TLV2541, TLC2551,
TLC3541, or TLC4541 EVMs along with the HPA449 evaluation system from
SoftBaugh™, makes developing the interface even easier.
Contents
1 Introduction .......................................................................................... 2
2 Hardware Setup Configuration .................................................................... 2
3 Software Development ............................................................................. 8
4 References .......................................................................................... 9
List of Figures
1 HPA449 Board From SoftBaugh.................................................................. 3
2 ADC EVM Board Layout ........................................................................... 3
3 MSP430 Hardware I/O ............................................................................. 4
4 Valid Reset Cycle – TLC3541/TLC4541 ......................................................... 5
5 TLV2541 Conversion Process .................................................................... 6
6 TLC3541 Conversion Process .................................................................... 7
7 TLC4541 Conversion Process .................................................................... 7
8 TLC2551 Conversion Process .................................................................... 8
9 Software Overview ................................................................................. 9
List of Tables
1 Main Features of the Four ADCs ................................................................. 2
2 Summary of Important Details .................................................................... 2
3 Data After Valid Reset Cycle ...................................................................... 4
4 SCLKs for Sampling ................................................................................ 5
5 Device and Conversion ............................................................................ 6
SoftBaugh is a trademark of SoftBaugh, Inc..
1SLAA234 – February 2005 Interfacing Low Power Serial (SPI) ADCs to the MSP430F449
Verzeichnis
- ・ Blockdiagramm on Seite 4
- ・ Anwendungsbereich on Seite 11
