ECCN 5E002 TSPA - Technology / Software Publicly Available
CC430F613x
CC430F612x
CC430F513x
SLAS554F –MAY 2009–REVISED DECEMBER 2011
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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, XT1DRIVEx = 1, 0.075
TA= 25°C
Differential XT1 oscillator crystal fOSC = 32768 Hz, XTS = 0,
ΔIDVCC.LF current consumption from lowest XT1BYPASS = 0, XT1DRIVEx = 2, 3.0 V 0.170 µA
drive setting, LF mode TA= 25°C
fOSC = 32768 Hz, XTS = 0,
XT1BYPASS = 0, XT1DRIVEx = 3, 0.290
TA= 25°C
XT1 oscillator crystal frequency,
fXT1,LF0 XTS = 0, XT1BYPASS = 0 32768 Hz
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 kΩ
LF crystals(4) XTS = 0,
XT1BYPASS = 0, XT1DRIVEx = 1, 300
fXT1,LF = 32768 Hz, CL,eff = 12 pF
XTS = 0, XCAPx = 0(6) 2
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, XT1DRIVEx = 0, 1000
TA= 25°C,
CL,eff = 6 pF
tSTART,LF Startup time, LF mode 3.0 V ms
fOSC = 32768 Hz, XTS = 0,
XT1BYPASS = 0, XT1DRIVEx = 3, 500
TA= 25°C,
CL,eff = 12 pF
(1) To improve EMI on the XT1 oscillator, the following guidelines should be observed.
(a) Keep the trace between the device and the crystal as short as possible.
(b) Design a good ground plane around the oscillator pins.
(c) Prevent crosstalk from other clock or data lines into oscillator pins XIN and XOUT.
(d) Avoid running PCB traces underneath or adjacent to the XIN and XOUT pins.
(e) Use assembly materials and praxis to avoid any parasitic load on the oscillator XIN and XOUT pins.
(f) If conformal coating is used, ensure that it does not induce capacitive/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:
(a) For XT1DRIVEx = 0, CL,eff ≤6 pF
(b) For XT1DRIVEx = 1, 6 pF ≤CL,eff ≤9 pF
(c) For XT1DRIVEx = 2, 6 pF ≤CL,eff ≤10 pF
(d) 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, 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.
(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.
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