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MSP430F5507 Folha de dados(PDF) 28 Page - Texas Instruments |
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MSP430F5507 Folha de dados(HTML) 28 Page - Texas Instruments |
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28 / 125 page  28 MSP430F5510, MSP430F5509, MSP430F5508 MSP430F5507, MSP430F5506, MSP430F5505, MSP430F5504 MSP430F5503, MSP430F5502, MSP430F5501, MSP430F5500 SLAS645L – JULY 2009 – REVISED MAY 2020 www.ti.com Submit Documentation Feedback Product Folder Links: MSP430F5510 MSP430F5509 MSP430F5508 MSP430F5507 MSP430F5506 MSP430F5505 MSP430F5504 MSP430F5503 MSP430F5502 MSP430F5501 MSP430F5500 Specifications Copyright © 2009–2020, Texas Instruments Incorporated (1) To improve EMI on the XT1 oscillator, the following guidelines should be observed. • Keep the trace between the device 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, make sure that it does not induce capacitive or resistive leakage between the oscillator pins. (2) When XT1BYPASS is set, XT1 circuits are automatically powered down. Input signal is a digital square wave with parametrics defined in the Schmitt-trigger Inputs section of this datasheet. (3) Maximum frequency of operation of the entire device cannot be exceeded. (4) Oscillation allowance is based on a safety factor of 5 for recommended crystals. The oscillation allowance is a function of the XT1DRIVEx settings and the effective load. In general, comparable oscillator allowance can be achieved based on the following guidelines, but should be evaluated based on the actual crystal selected for the application: • For XT1DRIVEx = 0, CL,eff ≤ 6 pF • For XT1DRIVEx = 1, 6 pF ≤ CL,eff ≤ 9 pF • For XT1DRIVEx = 2, 6 pF ≤ CL,eff ≤ 10 pF • For XT1DRIVEx = 3, CL,eff ≥ 6 pF (5) Includes parasitic bond and package capacitance (approximately 2 pF per pin). Because the PCB adds additional capacitance, 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. (6) Requires external capacitors at both terminals. Values are specified by crystal manufacturers. (7) Frequencies below the MIN specification set the fault flag. Frequencies above the MAX specification do not set the fault flag. Frequencies between the MIN and MAX specifications might set the flag. (8) Measured with logic-level input frequency but also applies to operation with crystals. 5.15 Crystal Oscillator, XT1, Low-Frequency Mode (1) over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) PARAMETER TEST CONDITIONS VCC MIN TYP MAX UNIT ΔIDVCC.LF Differential XT1 oscillator crystal current consumption from lowest drive setting, LF mode fOSC = 32768 Hz, XTS = 0, XT1BYPASS = 0, XT1DRIVEx = 1, TA = 25°C 3 V 0.075 µA fOSC = 32768 Hz, XTS = 0, XT1BYPASS = 0, XT1DRIVEx = 2, TA = 25°C 0.170 fOSC = 32768 Hz, XTS = 0, XT1BYPASS = 0, XT1DRIVEx = 3, TA = 25°C 0.290 fXT1,LF0 XT1 oscillator crystal frequency, LF mode XTS = 0, XT1BYPASS = 0 32768 Hz fXT1,LF,SW XT1 oscillator logic-level square- wave input frequency, LF mode XTS = 0, XT1BYPASS = 1(2) (3) 10 32.768 50 kHz OALF Oscillation allowance for LF crystals(4) XTS = 0, XT1BYPASS = 0, XT1DRIVEx = 0, fXT1,LF = 32768 Hz, CL,eff = 6 pF 210 k Ω XTS = 0, XT1BYPASS = 0, XT1DRIVEx = 1, fXT1,LF = 32768 Hz, CL,eff = 12 pF 300 CL,eff Integrated effective load capacitance, LF mode(5) XTS = 0, XCAPx = 0(6) 1 pF XTS = 0, XCAPx = 1 5.5 XTS = 0, XCAPx = 2 8.5 XTS = 0, XCAPx = 3 12.0 Duty cycle, LF mode XTS = 0, Measured at ACLK, fXT1,LF = 32768 Hz 30% 70% fFault,LF Oscillator fault frequency, LF mode(7) XTS = 0(8) 10 10000 Hz tSTART,LF Start-up time, LF mode fOSC = 32768 Hz, XTS = 0, XT1BYPASS = 0, XT1DRIVEx = 0, TA = 25°C, CL,eff = 6 pF 3 V 1000 ms fOSC = 32768 Hz, XTS = 0, XT1BYPASS = 0, XT1DRIVEx = 3, TA = 25°C, CL,eff = 12 pF 500 |
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