Texas Instruments SWRU294, Руководство пользователя, Страница: 16 / 57

SWRU294
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6.2 MSP430 MCU
The SmartRF TrxEB is equipped with a MSP430F5438A micro controller from Texas Instruments.
Please see the MSP430F5438A product page [6] on the TI website for detailed information about
this controller.
All
of the EB’s user interface peripherals are available to the MSP430 (Figure 3 on page 12).
Excluding the EM, the list of available peripherals consists of
- LCD
- 5x Buttons
- 4x LEDs
- Ambient Light Sensor
- Accelerometer
- SPI Flash.
The recommended operating condition for the MSP430 is a supply voltage (V
CC
) between 1.8 V
and 3.6 V. The min (max) operating temperature is -40 (+85)
˚C.
6.3 Power Sources
There are four possible solutions for applying power to the SmartRF TrxEB; batteries, USB bus,
external power supply and MSP-FET. The power source can be selected using the power source
selection jumpers on header P17 (Figure 6). The main power supply switch (S5) turns off all
power sources.
Figure 6
– Main power selection header (P17) and power switch (P5)
WARNING! Do not use multiple power sources to power the SmartRF TrxEB at the same
time. Doing so may lead to excessive currents, causing onboard components to break.
WARNING! When using the SmartRF TrxEB with a MSP430 debugger (e.g. MSP-
FET430UIF), while powering the EB with a different power source (batteries, USB or external
power supply), a jumper should short circuit pin 9-10 of header P17
(“LCL”). This will prevent
the MSP-FET from supplying power to the EB.
NOTE: The onboard MSP430 MCU is held in reset by the USB MCU in SmartRF Mode. In
order to use the MSP430, make sure the USB MCU is set to Disabled Mode or UART Mode.
See section 6.1 for details.