C
L1
C
L2
LFXIN
or
HFXIN
LFXOUT
or
HFXOUT
Digital
Power Supply
Decoupling
100 nF
4.7 F
µ
Analog
Power Supply
Decoupling
DVCC
DVSS
AVCC
AVSS
+
+
100 nF
4.7 F
µ
180
SLAS826F – MARCH 2015 – REVISED MARCH 2017
Product Folder Links:
Applications, Implementation, and Layout
Copyright © 2015–2017, Texas Instruments Incorporated
7
Applications, Implementation, and Layout
NOTE
Information in the following Applications section 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 MSP432 microcontrollers.
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 4.7-µF plus a 100-nF low-ESR ceramic decoupling
capacitor to each AVCC and DVCC pin (see
). 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). Additionally, TI recommends separated grounds with a
single-point connection for better noise isolation from digital-to-analog circuits on the board and for high
analog accuracy.
Figure 7-1. Power Supply Decoupling
7.1.2
External Oscillator
The device supports a low-frequency crystal (32.768 kHz) on the LFXT pins and a high-frequency crystal
on the HFXT pins. External bypass capacitors for the crystal oscillator pins are required.
It is also possible to apply digital clock signals to the LFXIN and HFXIN input pins that meet the
specifications of the respective oscillator if the appropriate LFXTBYPASS or HFXTBYPASS mode is
selected. In this case, the associated LFXOUT and HFXOUT pins can be used for other purposes.
shows a typical connection diagram.
Figure 7-2. Typical Crystal Connection