MSP430FR6889 Datasheet, PDF (148/176 Pages) Texas Instruments – Mixed-Signal Microcontrollers

MSP430FR6889, MSP430FR68891, MSP430FR6888, MSP430FR6887
MSP430FR5889, MSP430FR58891, MSP430FR5888, MSP430FR5887
SLASE32A – AUGUST 2014 – REVISED MARCH 2015
7 Applications, Implementation, and Layout
www.ti.com
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 MSP430. 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 1-µF plus a 100-nF low-ESR ceramic decoupling capacitor
to each AVCC, DVCC, and ESIDVCC 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 recommend
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
+
1 µF
100 nF
Analog
Power Supply
Decoupling
+
1 µF
100 nF
DVCC, ESIDVCC
DVSS, ESIDVSS
AVCC
AVSS
Figure 7-1. Power Supply Decoupling
7.1.2 External Oscillator
Depending on the device variant (see Section 3), the device can support a low-frequency crystal (32 kHz)
on the LFXT pins, a high-frequency crystal on the HFXT pins, or both. 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. If they
are left unused, they must be terminated according to Section 4.6.
Figure 7-2 shows a typical connection diagram.
148 Applications, Implementation, and Layout
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