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MSP430F6736A Datasheet(PDF) 38 Page - Texas Instruments |
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MSP430F6736A Datasheet(HTML) 38 Page - Texas Instruments |
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38 / 149 page  MSP430F6736A, MSP430F6735A, MSP430F6734A, MSP430F6733A MSP430F6731A, MSP430F6730A, MSP430F6726A, MSP430F6725A MSP430F6724A, MSP430F6723A, MSP430F6721A, MSP430F6720A SLASE46 – FEBRUARY 2015 www.ti.com 5.7.3 Clock Specifications Table 5-2. 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 fOSC = 32768 Hz, XTS = 0, XT1BYPASS = 0, 0.075 XT1DRIVEx = 1, TA = 25°C Differential XT1 oscillator crystal current consumption fOSC = 32768 Hz, XTS = 0, XT1BYPASS = 0, ΔIDVCC.LF 3.0 V 0.170 µA from lowest drive setting, LF XT1DRIVEx = 2, TA = 25°C mode fOSC = 32768 Hz, XTS = 0, XT1BYPASS = 0, 0.290 XT1DRIVEx = 3, TA = 25°C XT1 oscillator crystal fXT1,LF0 XTS = 0, XT1BYPASS = 0 32768 Hz frequency, LF mode XT1 oscillator logic-level fXT1,LF,SW square-wave input frequency, XTS = 0, XT1BYPASS = 1(2) (3) 10 32.768 50 kHz LF mode XTS = 0, XT1BYPASS = 0, XT1DRIVEx = 0, 210 fXT1,LF = 32768 Hz, CL,eff = 6 pF Oscillation allowance for OALF k Ω LF crystals(4) XTS = 0, XT1BYPASS = 0, XT1DRIVEx = 1, 300 fXT1,LF = 32768 Hz, CL,eff = 12 pF XTS = 0, XCAPx = 0(6) 1 XTS = 0, XCAPx = 1 5.5 Integrated effective load CL,eff pF capacitance, LF mode(5) XTS = 0, XCAPx = 2 8.5 XTS = 0, XCAPx = 3 12.0 XTS = 0, Measured at ACLK, Duty cycle, LF mode 30% 70% fXT1,LF = 32768 Hz Oscillator fault frequency, fFault,LF XTS = 0(8) 10 10000 Hz LF mode(7) fOSC = 32768 Hz, XTS = 0, XT1BYPASS = 0, 1000 XT1DRIVEx = 0, TA = 25°C, CL,eff = 6 pF tSTART,LF Start-up time, LF mode 3.0 V ms fOSC = 32768 Hz, XTS = 0, XT1BYPASS = 0, 500 XT1DRIVEx = 3, TA = 25°C, CL,eff = 12 pF (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, ensure 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, TI recommends verifying 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 in between might set the flag. (8) Measured with logic-level input frequency but also applies to operation with crystals. 38 Specifications Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: MSP430F6736A MSP430F6735A MSP430F6734A MSP430F6733A MSP430F6731A MSP430F6730A MSP430F6726A MSP430F6725A MSP430F6724A MSP430F6723A MSP430F6721A MSP430F6720A |
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