SLAS753C datasheet(21/44 Pages) TI1

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DCO(RSEL,DCO+1)

DCO(RSEL,DCO)

average

DCO(RSEL,DCO)

DCO(RSEL,DCO+1)

32 × f

× f

MOD × f

+ (32 – MOD) × f

MSP430G22x0

www.ti.com

SLAS753D – JANUARY 2012 – REVISED AUGUST 2012

Main DCO Characteristics

•

All ranges selected by RSELx overlap with RSELx + 1: RSELx = 0 overlaps RSELx = 1, ... RSELx = 14

overlaps RSELx = 15.

•

DCO control bits DCOx have a step size as defined by parameter SDCO.

•

Modulation control bits MODx select how often fDCO(RSEL,DCO+1) is used within the period of 32 DCOCLK

cycles. The frequency fDCO(RSEL,DCO) is used for the remaining cycles. The frequency is an average equal to:

DCO Frequency

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

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX

UNIT

RSELx < 14

1.8

3.6

VCC

Supply voltage

RSELx = 14

2.2

3.6

RSELx = 15

3.0

3.6

fDCO(0,0)

DCO frequency (0, 0)

RSELx = 0, DCOx = 0, MODx = 0

3 V

0.06

0.14

MHz

fDCO(0,3)

DCO frequency (0, 3)

RSELx = 0, DCOx = 3, MODx = 0

3 V

0.12

MHz

fDCO(1,3)

DCO frequency (1, 3)

RSELx = 1, DCOx = 3, MODx = 0

3 V

0.15

MHz

fDCO(2,3)

DCO frequency (2, 3)

RSELx = 2, DCOx = 3, MODx = 0

3 V

0.21

MHz

fDCO(3,3)

DCO frequency (3, 3)

RSELx = 3, DCOx = 3, MODx = 0

3 V

0.30

MHz

fDCO(4,3)

DCO frequency (4, 3)

RSELx = 4, DCOx = 3, MODx = 0

3 V

0.41

MHz

fDCO(5,3)

DCO frequency (5, 3)

RSELx = 5, DCOx = 3, MODx = 0

3 V

0.58

MHz

fDCO(6,3)

DCO frequency (6, 3)

RSELx = 6, DCOx = 3, MODx = 0

3 V

0.80

MHz

fDCO(7,3)

DCO frequency (7, 3)

RSELx = 7, DCOx = 3, MODx = 0

3 V

0.80

1.50

MHz

fDCO(8,3)

DCO frequency (8, 3)

RSELx = 8, DCOx = 3, MODx = 0

3 V

1.6

MHz

fDCO(9,3)

DCO frequency (9, 3)

RSELx = 9, DCOx = 3, MODx = 0

3 V

2.3

MHz

fDCO(10,3)

DCO frequency (10, 3)

RSELx = 10, DCOx = 3, MODx = 0

3 V

3.4

MHz

fDCO(11,3)

DCO frequency (11, 3)

RSELx = 11, DCOx = 3, MODx = 0

3 V

4.25

MHz

fDCO(12,3)

DCO frequency (12, 3)

RSELx = 12, DCOx = 3, MODx = 0

3 V

4.3

7.30

MHz

fDCO(13,3)

DCO frequency (13, 3)

RSELx = 13, DCOx = 3, MODx = 0

3 V

7.8

MHz

fDCO(14,3)

DCO frequency (14, 3)

RSELx = 14, DCOx = 3, MODx = 0

3 V

8.6

13.9

MHz

fDCO(15,3)

DCO frequency (15, 3)

RSELx = 15, DCOx = 3, MODx = 0

3 V

15.25

MHz

fDCO(15,7)

DCO frequency (15, 7)

RSELx = 15, DCOx = 7, MODx = 0

3 V

MHz

Frequency step between

SRSEL

SRSEL = fDCO(RSEL+1,DCO)/fDCO(RSEL,DCO)

3 V

1.35

ratio

range RSEL and RSEL+1

Frequency step between tap

SDCO

SDCO = fDCO(RSEL,DCO+1)/fDCO(RSEL,DCO)

3 V

1.08

ratio

DCO and DCO+1

Duty cycle

3 V

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