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MSP430FR2111IRLLR Datasheet(PDF) 62 Page - Texas Instruments |
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MSP430FR2111IRLLR Datasheet(HTML) 62 Page - Texas Instruments |
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62 / 75 page  62 MSP430FR2111, MSP430FR2110 SLASE78A – AUGUST 2016 – REVISED AUGUST 2016 www.ti.com Submit Documentation Feedback Product Folder Links: MSP430FR2111 MSP430FR2110 Applications, Implementation, and Layout Copyright © 2016, Texas Instruments Incorporated 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. 7.2.1.3 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. 7.3 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 DESIGN NAME LINK Thermostat Implementation With MSP430FR4xx TIDM-FRAM-THERMOSTAT Water Meter Implementation With MSP430FR4xx TIDM-FRAM-WATERMETER Remote Controller of Air Conditioner Using Low-Power Microcontroller TIDM-REMOTE-CONTROLLER-FOR-AC |
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