PIC24FJ64GA004 Family Silicon Errata and Data Sheet ... - Microchip

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PIC24FJ64GA004 FAMILYData Sheet ClarificationsThe following typographic corrections and clarificationsare to be noted for the latest version of the device datasheet (DS39881D):Note:1. Module: Guidelines for Getting Startedwith 16-Bit MicrocontrollersSection 2.4 “Voltage Regulator Pins” (ENVREG/DISVREG and VCAP/VDDCORE) has been replaced witha new and more detailed section. The entire text follows:2.4 Voltage Regulator Pins (ENVREG/DISVREG and VCAP/VDDCORE)Note:Corrections are shown in bold. Wherepossible, the original bold text formattinghas been removed for clarity.This section applies only to PIC24FJdevices with an on-chip voltage regulator.The on-chip voltage regulator enable/disable pin(ENVREG or DISVREG, depending on the devicefamily) must always be connected directly to either asupply voltage or to ground. The particular connectionis determined by whether or not the regulator is to beused:• For ENVREG, tie to VDD to enable the regulator,or to ground to disable the regulator• For DISVREG, tie to ground to enable theregulator or to VDD to disable the regulatorRefer to Section 24.2 “On-Chip Voltage Regulator”for details on connecting and using the on-chipregulator.When the regulator is enabled, a low-ESR (< 5Ω)capacitor is required on the VCAP/VDDCORE pin tostabilize the voltage regulator output voltage. The VCAP/VDDCORE pin must not be connected to VDD and mustuse a capacitor of 10 µF connected to ground. The typecan be ceramic or tantalum. Suitable examples ofcapacitors are shown in Table 2-1. Capacitors withequivalent specifications can be used.Designers may use Figure 2-3 to evaluate ESRequivalence of candidate devices.The placement of this capacitor should be close toVCAP/VDDCORE. It is recommended that the tracelength not exceed 0.25 inch (6 mm). Refer toSection 27.0 “Electrical Characteristics” foradditional information.When the regulator is disabled, the VCAP/VDDCORE pinmust be tied to a voltage supply at the VDDCORE level.Refer to Section 27.0 “Electrical Characteristics” forinformation on VDD and VDDCORE.FIGURE 2-3ESR ()1010.10.01FREQUENCY vs. ESRPERFORMANCE FORSUGGESTED VCAP0.0010.01 0.1 1 10 100 1000 10,000Frequency (MHz)Note:Typical data measurement at 25°C, 0V DC bias..TABLE 2-1SUITABLE CAPACITOR EQUIVALENTSMake Part #NominalCapacitanceBase Tolerance Rated Voltage Temp. RangeTDK C3216X7R1C106K 10 µF ±10% 16V -55 to 125ºCTDK C3216X5R1C106K 10 µF ±10% 16V -55 to 85ºCPanasonic ECJ-3YX1C106K 10 µF ±10% 16V -55 to 125ºCPanasonic ECJ-4YB1C106K 10 µF ±10% 16V -55 to 85ºCMurata GRM32DR71C106KA01L 10 µF ±10% 16V -55 to 125ºCMurata GRM31CR61C106KC31L 10 µF ±10% 16V -55 to 85ºCDS80470G-page 20 2009-2013 Microchip Technology Inc.
PIC24FJ64GA004 FAMILY2.4.1 CONSIDERATIONS FOR CERAMICCAPACITORSIn recent years, large value, low-voltage, surfacemount ceramic capacitors have become very costeffective in sizes up to a few tens of microfarad. Thelow-ESR, small physical size and other propertiesmake ceramic capacitors very attractive in many typesof applications.Ceramic capacitors are suitable for use with theinternal voltage regulator of this microcontroller. However,some care is needed in selecting the capacitor toensure that it maintains sufficient capacitance over theintended operating range of the application.Typical low-cost 10 µF ceramic capacitors are availablein X5R, X7R and Y5V dielectric ratings (other types arealso available, but are less common). The initial tolerancespecifications for these types of capacitors areoften specified as ±10% to ±20% (X5R and X7R), or-20%/+80% (Y5V). However, the effective capacitancethat these capacitors provide in an application circuitwill also vary based on additional factors, such as theapplied DC bias voltage and the temperature. The totalin-circuit tolerance is, therefore, much wider than theinitial tolerance specification.The X5R and X7R capacitors typically exhibit satisfactorytemperature stability (ex: ±15% over a widetemperature range, but consult the manufacturer's datasheets for exact specifications). However, Y5V capacitorstypically have extreme temperature tolerancespecifications of +22%/-82%. Due to the extremetemperature tolerance, a 10 µF nominal rated Y5V typecapacitor may not deliver enough total capacitance tomeet minimum internal voltage regulator stability andtransient response requirements. Therefore, Y5Vcapacitors are not recommended for use with theinternal voltage regulator if the application mustoperate over a wide temperature range.In addition to temperature tolerance, the effectivecapacitance of large value ceramic capacitors can varysubstantially, based on the amount of DC voltageapplied to the capacitor. This effect can be very significant,but is often overlooked or is not alwaysdocumented.A typical DC bias voltage vs. capacitance graph for16V, 10V and 6.3V rated capacitors is shown inFigure 2-4.FIGURE 2-4Capacitance Change(%)100-10-20-30-40-50-60-70-806.3V CapacitorDC BIAS VOLTAGE vs.CAPACITANCECHARACTERISTICS10V Capacitor0 1 2 3 4 6 7 8 95 10 11 12 13 14 15 16 17DC Bias Voltage (VDC)16V CapacitorWhen selecting a ceramic capacitor to be used with theinternal voltage regulator, it is suggested to select ahigh-voltage rating, so that the operating voltage is asmall percentage of the maximum rated capacitor voltage.For example, choose a ceramic capacitor rated at16V for the 2.5V core voltage. Suggested capacitorsare shown in Table 2-1. 2009-2013 Microchip Technology Inc. DS80470G-page 21
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