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MSP430FG479 Datasheet(PDF) 25 Page - Texas Instruments |
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MSP430FG479 Datasheet(HTML) 25 Page - Texas Instruments |
25 / 97 page 25 MSP430FG479, MSP430FG478, MSP430FG477 www.ti.com SLAS580E – OCTOBER 2008 – REVISED MAY 2020 Submit Documentation Feedback Product Folder Links: MSP430FG479 MSP430FG478 MSP430FG477 Specifications Copyright © 2008–2020, Texas Instruments Incorporated (1) To improve EMI on the low-power LFXT1 oscillator, particularly in the LF mode (32 kHz), the following guidelines should be observed. • Keep the trace between the MCU and the crystal as short as possible. • Design a good ground plane around the oscillator pins. • Prevent crosstalk from other clock or data lines into oscillator pins XIN and XOUT. • Avoid running PCB traces underneath or adjacent to the XIN and XOUT pins. • Use assembly materials and processes that avoid any parasitic load on the oscillator XIN and XOUT pins. • If conformal coating is used, ensure that it does not induce capacitive or resistive leakage between the oscillator pins. • Do not route the XOUT line to the JTAG header to support the serial programming adapter as shown in other documentation. This signal is no longer required for the serial programming adapter. (2) Includes parasitic bond and package capacitance (approximately 2 pF per pin). Since the PCB adds additional capacitance it is recommended to verify the correct load by measuring the ACLK frequency. For a correct setup the effective load capacitance should always match the specification of the used crystal. (3) Frequencies below the MIN specification set the fault flag, frequencies above the MAX specification do not set the fault flag, and frequencies in between might set the flag. (4) Measured with logic level input frequency but also applies to operation with crystals. 5.15 Crystal Oscillator, LFXT1, Low-Frequency Mode over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) (1) PARAMETER TEST CONDITIONS VCC MIN TYP MAX UNIT fLFXT1,LF LFXT1 oscillator crystal frequency, LF mode 0, 1 XTS = 0, LFXT1Sx = 0 or 1 1.8 V to 3.6 V 32768 Hz OALF Oscillation allowance for LF crystals XTS = 0, LFXT1Sx = 0, fLFXT1,LF = 32768 kHz, CL,eff = 6 pF 500 kΩ XTS = 0, LFXT1Sx = 0, fLFXT1,LF = 32768 kHz, CL,eff = 12 pF 200 CL,eff Integrated effective load capacitance, LF mode(2) XTS = 0, XCAPx = 0 1 XTS = 0, XCAPx = 1 5.5 XTS = 0, XCAPx = 2 8.5 pF XTS = 0, XCAPx = 3 11 Duty cycle, LF mode XTS = 0, Measured at P1.5/ACLK, fLFXT1,LF = 32768Hz 2.2 V, 3 V 30 50 70 % fFault,LF Oscillator fault frequency, LF mode(3) XTS = 0, XCAPx = 0, LFXT1Sx = 3(4) 2.2 V, 3 V 10 10000 Hz |
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