MF5438AMEP datasheet(49/100 Pages) TI2

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MSP430F5438A-EP

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SLAS967A – JANUARY 2014 – REVISED JANUARY 2014

Crystal Oscillator, XT1, High-Frequency Mode

(1)(2)

(continued)

over recommended ranges of supply voltage and TJ = -40°C to 85°C (unless otherwise noted)

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX

UNIT

Integrated effective load

CL,eff

XTS = 1

capacitance, HF mode(6)(7)

XTS = 1, Measured at ACLK,

Duty cycle, HF mode

fXT1,HF2 = 20 MHz

Oscillator fault frequency,

fFault,HF

XTS = 1(9)

300

kHz

HF mode(8)

(6)

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.

(7)

Requires external capacitors at both terminals. Values are specified by crystal manufacturers. In general, an effective load capacitance

of up to 18 pF can be supported.

(8)

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.

(9)

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

Crystal Oscillator, XT2

(1)

over recommended ranges of supply voltage and TJ = -40°C to 85°C (unless otherwise noted)

(2) (3)

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX

UNIT

fOSC = 4 MHz, XT2OFF = 0,

XT2BYPASS = 0, XT2DRIVEx = 0,

200

TA = 25°C

fOSC = 12 MHz, XT2OFF = 0,

XT2BYPASS = 0, XT2DRIVEx = 1,

260

TA = 25°C

XT2 oscillator crystal current

IDVCC.XT2

3.0 V

µA

consumption

fOSC = 20 MHz, XT2OFF = 0,

XT2BYPASS = 0, XT2DRIVEx = 2,

325

TA = 25°C

fOSC = 32 MHz, XT2OFF = 0,

XT2BYPASS = 0, XT2DRIVEx = 3,

450

TA = 25°C

XT2 oscillator crystal frequency,

fXT2,HF0

XT2DRIVEx = 0, XT2BYPASS = 0(4)

MHz

mode 0

XT2 oscillator crystal frequency,

fXT2,HF1

XT2DRIVEx = 1, XT2BYPASS = 0 (4)

MHz

mode 1

XT2 oscillator crystal frequency,

fXT2,HF2

XT2DRIVEx = 2, XT2BYPASS = 0 (4)

MHz

mode 2

XT2 oscillator crystal frequency,

fXT2,HF3

XT2DRIVEx = 3, XT2BYPASS = 0 (4)

MHz

mode 3

XT2 oscillator logic-level square-

fXT2,HF,SW

wave input frequency, bypass

XT2BYPASS = 1(5) (4)

0.7

MHz

mode

(1)

Use of crystal oscillator is not ensured above 85°C. It is recommended that an external digital clock source or other internally generated

clock source.

(2)

Requires external capacitors at both terminals. Values are specified by crystal manufacturers. In general, an effective load capacitance

of up to 18 pF can be supported.

(3)

To improve EMI on the XT2 oscillator the following guidelines should be observed.

(a) Keep the traces between the device and the crystal as short as possible.

(b) Design a good ground plane around the oscillator pins.

(d) Avoid running PCB traces underneath or adjacent to the XT2IN and XT2OUT pins.

(e) Use assembly materials and praxis to avoid any parasitic load on the oscillator XT2IN and XT2OUT pins.

(f) If conformal coating is used, ensure that it does not induce capacitive or resistive leakage between the oscillator pins.

(4)

This represents the maximum frequency that can be input to the device externally. Maximum frequency achievable on the device

operation is based on the frequencies present on ACLK, MCLK, and SMCLK cannot be exceed for a given range of operation.

(5)

When XT2BYPASS is set, the XT2 circuit is automatically powered down. Input signal is a digital square wave with parametrics defined

in the Schmitt-trigger Inputs section of this datasheet.

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