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MSP430FR2111IRLLR Datasheet(PDF) 63 Page - Texas Instruments

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Part No. MSP430FR2111IRLLR
Description  Mixed-Signal Microcontrollers
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

MSP430FR2111IRLLR Datasheet(HTML) 63 Page - Texas Instruments

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MSP430FR2111, MSP430FR2110, MSP430FR2100, MSP430FR2000
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Product Folder Links: MSP430FR2111 MSP430FR2110 MSP430FR2100 MSP430FR2000
Applications, Implementation, and Layout
Copyright © 2016–2017, Texas Instruments Incorporated
In addition to grounding, ripple and noise spikes on the power-supply lines that are caused by digital
switching or switching power supplies can corrupt the conversion result. TI recommends a noise-free
design using separate analog and digital ground planes with a single-point connection to achieve high
Figure 7-5 shows the recommended decoupling circuit when an external voltage reference is used. The
internal reference module has a maximum drive current as described in the sections ADC Pin Enable and
1.2-V Reference Settings of the MSP430FR4xx and MSP430FR2xx Family User's Guide.
The reference voltage must be a stable voltage for accurate measurements. The capacitor values that are
selected in the general guidelines filter out the high- and low-frequency ripple before the reference voltage
enters the device. In this case, the 10-µF capacitor is used to buffer the reference pin and filter any low-
frequency ripple. A bypass capacitor of 100 nF is used to filter out any high-frequency noise.
Layout Guidelines
Components that are shown in the partial schematic (see Figure 7-5) should be placed as close as
possible to the respective device pins to avoid long traces, because they add additional parasitic
capacitance, inductance, and resistance on the signal.
Avoid routing analog input signals close to a high-frequency pin (for example, a high-frequency PWM),
because the high-frequency switching can be coupled into the analog signal.
Typical Applications
Table 7-1 lists several TI Designs that reflect the use of the MSP430FR211x 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, see the device-
specific product folders listed in Section 8.5.
Table 7-1. TI Designs
Thermostat Implementation With MSP430FR4xx
Water Meter Implementation With MSP430FR4xx
Remote Controller of Air Conditioner Using Low-Power Microcontroller

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