MSP430FR2033 Datasheet, PDF (69/89 Pages) Texas Instruments – Mixed-Signal Microcontrollers

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7 Applications, Implementation, and Layout
MSP430FR2033, MSP430FR2032
SLASE45B – OCTOBER 2014 – REVISED AUGUST 2015
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
7.1 Device Connection and Layout Fundamentals
This section discusses the recommended guidelines when designing with the MSP430FR413x devices.
These guidelines are to make sure that the device has proper connections for powering, programming,
debugging, and optimum analog performance.
7.1.1 Power Supply Decoupling and Bulk Capacitors
TI recommends connecting a combination of a 10-µF plus a 100-nF low-ESR ceramic decoupling
capacitor to the DVCC and DVSS pins. Higher-value capacitors may be used but can impact supply rail
ramp-up time. Decoupling capacitors must be placed as close as possible to the pins that they decouple
(within a few millimeters).
Power Supply
+
Decoupling
10 µF 100 nF
DVCC
DVSS
Figure 7-1. Power Supply Decoupling
7.1.2 External Oscillator
This device supports only a low-frequency crystal (32 kHz) on the XIN and XOUT pins. External bypass
capacitors for the crystal oscillator pins are required.
It is also possible to apply digital clock signals to the XIN input pin that meet the specifications of the
respective oscillator if the appropriate XT1BYPASS mode is selected. In this case, the associated XOUT
pin can be used for other purposes. If they are left unused, they must be terminated according to
Section 4.4.
Figure 7-2 shows a typical connection diagram.
XIN
XOUT
C
C
L1
L2
Figure 7-2. Typical Crystal Connection
See the application report MSP430 32-kHz Crystal Oscillators (SLAA322) for more information on
selecting, testing, and designing a crystal oscillator with the MSP430 devices.
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Applications, Implementation, and Layout
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