MSP430F6638IPZ datasheet(31/133 Pages) TI

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(4)

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.

(5)

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

•

Keep the traces 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 XT2IN and XT2OUT.

•

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

•

Use assembly materials and processes that avoid any parasitic load on the oscillator XT2IN and XT2OUT pins.

•

If conformal coating is used, make sure that it does not induce capacitive or resistive leakage between the oscillator pins.

(6)

When XT2BYPASS is set, the XT2 circuit is automatically powered down.

(7)

Maximum frequency of operation of the entire device cannot be exceeded.

(8)

Oscillation allowance is based on a safety factor of 5 for recommended crystals.

8.18 Internal Very-Low-Power Low-Frequency Oscillator (VLO)

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

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX UNIT

fVLO

VLO frequency

Measured at ACLK

1.8 V to 3.6 V

9.4

kHz

dfVLO/dT

VLO frequency temperature drift

Measured at ACLK(1)

1.8 V to 3.6 V

0.5

%/°C

dfVLO/dVCC VLO frequency supply voltage drift

Measured at ACLK(2)

1.8 V to 3.6 V

%/V

Duty cycle

Measured at ACLK

1.8 V to 3.6 V

40%

50%

60%

(1)

Calculated using the box method: (MAX(–40°C to +85°C) – MIN(–40°C to +85°C)) / MIN(–40°C to +85°C) / (85°C – (–40°C))

(2)

Calculated using the box method: (MAX(1.8 V to 3.6 V) – MIN(1.8 V to 3.6 V)) / MIN(1.8 V to 3.6 V) / (3.6 V – 1.8 V)

8.19 Internal Reference, Low-Frequency Oscillator (REFO)

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

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX UNIT

IREFO

REFO oscillator current

consumption

TA = 25°C

1.8 V to 3.6 V

µA

fREFO

REFO frequency calibrated

Measured at ACLK

1.8 V to 3.6 V

32768

REFO absolute tolerance

calibrated

Full temperature range

1.8 V to 3.6 V

±3.5%

TA = 25°C

3 V

±1.5%

dfREFO/dT

REFO frequency temperature drift Measured at ACLK(1)

1.8 V to 3.6 V

0.01

%/°C

dfREFO/dVCC

REFO frequency supply voltage

drift

Measured at ACLK(2)

1.8 V to 3.6 V

1.0

%/V

Duty cycle

Measured at ACLK

1.8 V to 3.6 V

40%

50%

60%

tSTART

REFO start-up time

40%/60% duty cycle

1.8 V to 3.6 V

µs

(1)

Calculated using the box method: (MAX(–40°C to +85°C) – MIN(–40°C to +85°C)) / MIN(–40°C to +85°C) / (85°C – (–40°C))

(2)

Calculated using the box method: (MAX(1.8 V to 3.6 V) – MIN(1.8 V to 3.6 V)) / MIN(1.8 V to 3.6 V) / (3.6 V – 1.8 V)

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MSP430F6633, MSP430F6632, MSP430F6631, MSP430F6630

SLAS566G – JUNE 2010 – REVISED SEPTEMBER 2020

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