MSP430 Expansion Board Design

This site provides information about the design of an expansion board, specifically for the MSP430-449STK2 development board. The expansion board provides: Regulated power, 4 LED’s, a single SPI Digital to Analog Converter (DAC), an SPI temperature sensor, a pressure sensor, and a keypad interface.

MSP430-449STK2 Development Board

Figure 1: MSP430-449STK2

DOCUMENTS: MSP430-449STK2.pdf LCD-449STK2.pdf HARDWARE: Schematic MSP JTAG connector (top view) SOFTWARE: sample LCD code provided by Muneem Shahriar

The MSP430-449STK2 MSP430F449 STARTERKIT DEVELOPMENT BOARD from Olimex is shown above in Figure 1. Visit the Texas Instruments website for more information on the MSP430F449. Some links that give more information, and support for this family of Microcontrollers are provided below.

MSP430x4xx - Flash/ROM LCD

1. Technical Documents

• MSP430x4xx Family User's Guide (Rev. E)
• MSP430x4xx Mixed Signal Microcontroller Datasheet

2. Application Notes (From TI)

3. Code Examples (Click here for more examples from TI)

• IAR Assembler Examples
• IAR C Examples
• CCE Assembler Examples
• CCE C Examples

4. Compilers/Assemblers/Linkers

• IAR Embedded Workbench Kickstart - Free 4KB IDE (Click here for more info from TI)
• TI Code Composer Essentials Evaluation - Free 8KB IDE (Click here for more info from TI)

MSP430-449STK2 Expansion Board

Figure 2: MSP430-449STK2 Expansion Board

SOFTWARE: ExpressPCBSetup Ver. 5.6.0 HARDWARE: Expansion Board Schematic Expansion Board PCB Layout

The MSP430-449STK2 Expansion Board shown in Figure 2 interfaces the different components listed below, in Table 1, to the development board through header H1.

Part	Datasheet
12-Bit DAC with SPI Interface	MCP4921
Thermal Sensor with SPI Interface	TC77
Single Supply Quad Opamp	OP496
3x4 Rear Mount Keyboard	Series 96 Keypads
0 to 50kPa Ported Gauge Pressure Sensor	MPXM2053 Pressure Sensor
3.3V Regulator	L4931 Voltage Regulator
Table 1: Component Datasheets

System Design

DAC	Interfacing the MCP4921 to the MSP430F449
Thermal Sensor	Interfacing the TC77 to the MSP430F449
3x4 Keypad	Interfacing a 3x4 Keypad to the MSP430F449
Pressure Sensor	Interfacing the MPXM2053 Pressure Sensor to the MSP430F449
LED Configuration	Interfacing Four LED's to the MSP430F449
Table 2: System Design for each Component

Software

Various code examples for use of different components are provided in Table 3. These examples were tested using IAR Embedded Workbench IDE so be sure to use this code in the IAR environment. A zip file with all the following software is provided here.

Table 2: Code Examples

Component	Code Example
Buzzer	buzzer.c
3x4 Keypad	keypad.c
LED Configuration	LED.c
Microchip DAC	mcpdac.c
Microchip Temperature Sensor	temp.c
Timer B	timerb.c
Pressure Sensor	pressure.c

The test program provided in Table 3 tests all the different components shown in Table 2. The exception is that the test program performs a complete test of the expansion board and MSP430-449STK2 to ensure that each component is working properly.

Table 3: Test Program

Test Program

testprgm.c