0
1 2
3
4
5
6
7
Typical DCO Frequency, V = 3.0 V, T = 25°C
CC A
DCORSEL
100
10
1
0.1
f – MHz
DCO
DCOx = 31
DCOx = 0
MSP430F5529
,
MSP430F5528
,
MSP430F5527
,
MSP430F5526
MSP430F5525
,
MSP430F5524
,
MSP430F5522
,
MSP430F5521
MSP430F5519, MSP430F5517, MSP430F5515, MSP430F5514, MSP430F5513
www.ti.com
SLAS590M –MARCH 2009–REVISED NOVEMBER 2015
5.19 DCO Frequency
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
f
DCO(0,0)
DCO frequency (0, 0)
(1)
DCORSELx = 0, DCOx = 0, MODx = 0 0.07 0.20 MHz
f
DCO(0,31)
DCO frequency (0, 31)
(1)
DCORSELx = 0, DCOx = 31, MODx = 0 0.70 1.70 MHz
f
DCO(1,0)
DCO frequency (1, 0)
(1)
DCORSELx = 1, DCOx = 0, MODx = 0 0.15 0.36 MHz
f
DCO(1,31)
DCO frequency (1, 31)
(1)
DCORSELx = 1, DCOx = 31, MODx = 0 1.47 3.45 MHz
f
DCO(2,0)
DCO frequency (2, 0)
(1)
DCORSELx = 2, DCOx = 0, MODx = 0 0.32 0.75 MHz
f
DCO(2,31)
DCO frequency (2, 31)
(1)
DCORSELx = 2, DCOx = 31, MODx = 0 3.17 7.38 MHz
f
DCO(3,0)
DCO frequency (3, 0)
(1)
DCORSELx = 3, DCOx = 0, MODx = 0 0.64 1.51 MHz
f
DCO(3,31)
DCO frequency (3, 31)
(1)
DCORSELx = 3, DCOx = 31, MODx = 0 6.07 14.0 MHz
f
DCO(4,0)
DCO frequency (4, 0)
(1)
DCORSELx = 4, DCOx = 0, MODx = 0 1.3 3.2 MHz
f
DCO(4,31)
DCO frequency (4, 31)
(1)
DCORSELx = 4, DCOx = 31, MODx = 0 12.3 28.2 MHz
f
DCO(5,0)
DCO frequency (5, 0)
(1)
DCORSELx = 5, DCOx = 0, MODx = 0 2.5 6.0 MHz
f
DCO(5,31)
DCO frequency (5, 31)
(1)
DCORSELx = 5, DCOx = 31, MODx = 0 23.7 54.1 MHz
f
DCO(6,0)
DCO frequency (6, 0)
(1)
DCORSELx = 6, DCOx = 0, MODx = 0 4.6 10.7 MHz
f
DCO(6,31)
DCO frequency (6, 31)
(1)
DCORSELx = 6, DCOx = 31, MODx = 0 39.0 88.0 MHz
f
DCO(7,0)
DCO frequency (7, 0)
(1)
DCORSELx = 7, DCOx = 0, MODx = 0 8.5 19.6 MHz
f
DCO(7,31)
DCO frequency (7, 31)
(1)
DCORSELx = 7, DCOx = 31, MODx = 0 60 135 MHz
Frequency step between range
S
DCORSEL
S
RSEL
= f
DCO(DCORSEL+1,DCO)
/f
DCO(DCORSEL,DCO)
1.2 2.3 ratio
DCORSEL and DCORSEL + 1
Frequency step between tap
S
DCO
S
DCO
= f
DCO(DCORSEL,DCO+1)
/f
DCO(DCORSEL,DCO)
1.02 1.12 ratio
DCO and DCO + 1
Duty cycle Measured at SMCLK 40% 50% 60%
DCO frequency temperature
df
DCO
/dT f
DCO
= 1 MHz 0.1 %/°C
drift
(2)
df
DCO
/dV
CC
DCO frequency voltage drift
(3)
f
DCO
= 1 MHz 1.9 %/V
(1) When selecting the proper DCO frequency range (DCORSELx), the target DCO frequency, f
DCO
, should be set to reside within the
range of f
DCO(n, 0),MAX
≤ f
DCO
≤ f
DCO(n, 31),MIN
, where f
DCO(n, 0),MAX
represents the maximum frequency specified for the DCO frequency,
range n, tap 0 (DCOx = 0) and f
DCO(n,31),MIN
represents the minimum frequency specified for the DCO frequency, range n, tap 31
(DCOx = 31). This ensures that the target DCO frequency resides within the range selected. It should also be noted that if the actual
f
DCO
frequency for the selected range causes the FLL or the application to select tap 0 or 31, the DCO fault flag is set to report that the
selected range is at its minimum or maximum tap setting.
(2) 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))
(3) 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)
Figure 5-10. Typical DCO Frequency
Copyright © 2009–2015, Texas Instruments Incorporated Specifications 31
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