MSP430F6638IPZ datasheet(30/133 Pages) TI

30 / 133 page

(8)

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.

8.17 Crystal Oscillator, XT2

over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)(2) (5)

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX UNIT

IDVCC,XT2

XT2 oscillator crystal current

consumption

fOSC = 4 MHz, XT2OFF = 0,

XT2BYPASS = 0, XT2DRIVEx = 0,

TA = 25°C

3 V

200

µA

fOSC = 12 MHz, XT2OFF = 0,

XT2BYPASS = 0, XT2DRIVEx = 1,

TA = 25°C

260

fOSC = 20 MHz, XT2OFF = 0,

XT2BYPASS = 0, XT2DRIVEx = 2,

TA = 25°C

325

fOSC = 32 MHz, XT2OFF = 0,

XT2BYPASS = 0, XT2DRIVEx = 3,

TA = 25°C

450

fXT2,HF0

XT2 oscillator crystal frequency,

mode 0

XT2DRIVEx = 0, XT2BYPASS = 0(7)

MHz

fXT2,HF1

XT2 oscillator crystal frequency,

mode 1

XT2DRIVEx = 1, XT2BYPASS = 0(7)

MHz

fXT2,HF2

XT2 oscillator crystal frequency,

mode 2

XT2DRIVEx = 2, XT2BYPASS = 0(7)

MHz

fXT2,HF3

XT2 oscillator crystal frequency,

mode 3

XT2DRIVEx = 3, XT2BYPASS = 0(7)

MHz

fXT2,HF,SW

XT2 oscillator logic-level square-

wave input frequency

XT2BYPASS = 1(6) (7)

0.7

MHz

OAHF

Oscillation allowance for

HF crystals(8)

XT2DRIVEx = 0, XT2BYPASS = 0,

fXT2,HF0 = 6 MHz, CL,eff = 15 pF

450

Ω

XT2DRIVEx = 1, XT2BYPASS = 0,

fXT2,HF1 = 12 MHz, CL,eff = 15 pF

320

XT2DRIVEx = 2, XT2BYPASS = 0,

fXT2,HF2 = 20 MHz, CL,eff = 15 pF

200

XT2DRIVEx = 3, XT2BYPASS = 0,

fXT2,HF3 = 32 MHz, CL,eff = 15 pF

200

tSTART,HF

Start-up time

fOSC = 6 MHz

XT2BYPASS = 0, XT2DRIVEx = 0,

TA = 25°C, CL,eff = 15 pF

3 V

0.5

fOSC = 20 MHz

XT2BYPASS = 0, XT2DRIVEx = 3,

TA = 25°C, CL,eff = 15 pF

0.3

CL,eff

Integrated effective load

capacitance, HF mode(1) (2)

Duty cycle

Measured at ACLK, fXT2,HF2 = 20 MHz

40%

50%

60%

fFault,HF

Oscillator fault frequency(4)

XT2BYPASS = 1(3)

300

kHz

(1)

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.

(2)

Requires external capacitors at both terminals. Values are specified by crystal manufacturers.

(3)

Measured with logic-level input frequency but also applies to operation with crystals.

MSP430F6638, MSP430F6637, MSP430F6636, MSP430F6635, MSP430F6634

MSP430F6633, MSP430F6632, MSP430F6631, MSP430F6630

SLAS566G – JUNE 2010 – REVISED SEPTEMBER 2020

www.ti.com

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