Datasheet
C
L1
C
L2
XIN
XOUT
Power Supply
Decoupling
100 nF10 Fµ
DVCC
DVSS
+
MSP430FR4133, MSP430FR4132, MSP430FR4131
SLAS865B –OCTOBER 2014–REVISED AUGUST 2015
www.ti.com
7 Applications, Implementation, and Layout
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).
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.
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.
78 Applications, Implementation, and Layout Copyright © 2014–2015, Texas Instruments Incorporated
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Product Folder Links: MSP430FR4133 MSP430FR4132 MSP430FR4131