MSP432P401R Datasheet, PDF (141/157 Pages) Texas Instruments – Mixed-Signal Microcontrollers

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MSP432P401R, MSP432P401M
SLAS826B – MARCH 2015 – REVISED FEBRUARY 2016
7 Applications, Implementation, and Layout
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. 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, separated grounds with a single-point connection are
recommended for better noise isolation from digital to analog circuits on the board and are especially
recommended to achieve high analog accuracy.
Digital
Power Supply
Decoupling
+
4.7 µF 100 nF
Analog
Power Supply
Decoupling
+
4.7 µF 100 nF
DVCC
DVSS
AVCC
AVSS
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.
Figure 7-2 shows a typical connection diagram.
LFXIN
or
HFXIN
LFXOUT
or
HFXOUT
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 MSP432 devices.
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Applications, Implementation, and Layout 141
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