MSP430FR4133 Datasheet, PDF (84/101 Pages) Texas Instruments – Mixed-Signal Microcontrollers

MSP430FR4133, MSP430FR4132, MSP430FR4131
SLAS865B – OCTOBER 2014 – REVISED AUGUST 2015
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consecutive LCDMx registers. This allows use of simple look-up tables or software loops to output
numbers on an LCD, reducing computational overhead and optimizing the energy consumption of an
application. Establishing of the most convenient memory layout needs to be performed in conjunction with
the specific LCD that is being used to understand its design constraints in terms of which segment and
which common signals are connected to, for example, a digit.
For design information regarding the LCD controller input voltage selection including internal and external
options, contrast control, and bias generation, refer to the LCD_E controller chapter in the MSP430FR4xx
and MSP430FR2xx Family User's Guide (SLAU445).
7.2.2.4 Layout Guidelines
LCD segment (Sx) and common (COMx) signal traces are continuously switching while the LCD is
enabled and should, therefore, be kept away from sensitive analog signals such as ADC inputs to prevent
any noise coupling. TI recommends keeping the LCD signal traces on one side of the PCB grouped
together in a bus-like fashion. A ground plane underneath the LCD traces and guard traces employed
alongside the LCD traces can provide shielding.
If the internal charge pump of the LCD module is used, the externally provided capacitor on the LCDCAP0
and LCDCAP1 pins should be located as close as possible to the MCU. The capacitor should be
connected to the device using a short and direct trace.
For an example layout of connecting a 4-mux LCD with 27 segments to an MSP430FR4133 and using the
charge pump feature, see the MSP-EXP430FR4133 LaunchPad development kit (MSP-EXP430FR4133).
7.3 Typical Applications
Table 7-2 lists several TI Designs that reflect the use of the MSP430FR413x family of devices in different
real-world application scenarios. Consult these designs for additional guidance regarding schematic,
layout, and software implementation. For the most up-to-date list of available TI Designs, refer to the
device-specific product folders listed in Section 8.2.1.
Table 7-2. TI Designs
DESIGN NAME
Thermostat Implementation With MSP430FR4xx
Water Meter Implementation With MSP430FR4xx
Remote Controller of Air Conditioner Using Low-Power Microcontroller
LINK
TIDM-FRAM-THERMOSTAT
TIDM-FRAM-WATERMETER
TIDM-REMOTE-CONTROLLER-FOR-AC
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Applications, Implementation, and Layout
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Product Folder Links: MSP430FR4133 MSP430FR4132 MSP430FR4131