Datasheet

MSP430F42x
MIXED SIGNAL MICROCONTROLLER
SLAS421A − APRIL 2004 − REVISED JUNE 2007
25
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature (unless otherwise
noted) (continued)
DCO
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
f
(DCOCLK)
N
(DCO)
=01Eh, FN_8=FN_4=FN_3=FN_2=0, D = 2; DCOPLUS= 0,
f
Crystal
= 32.768 kHz
3 V 1 MHz
f
(DCO=2)
FN_8=FN_4=FN_3=FN_2=0 ; DCOPLUS = 1 3 V 0.3 0.7 1.3 MHz
f
(DCO=27)
FN_8=FN_4=FN_3=FN_2=0; DCOPLUS = 1 3 V 2.7 6.1 11.3 MHz
f
(DCO=2)
FN_8=FN_4=FN_3=0, FN_2=1; DCOPLUS = 1 3 V 0.8 1.5 2.5 MHz
f
(DCO=27)
FN_8=FN_4=FN_3=0, FN_2=1; DCOPLUS = 1 3 V 6.5 12.1 20 MHz
f
(DCO=2)
FN_8=FN_4=0, FN_3= 1, FN_2=x; DCOPLUS = 1 3 V 1.3 2.2 3.5 MHz
f
(DCO=27)
FN_8=FN_4=0, FN_3= 1, FN_2=x; DCOPLUS = 1 3 V 10.3 17.9 28.5 MHz
f
(DCO=2)
FN_8=0, FN_4= 1, FN_3= FN_2=x; DCOPLUS = 1 3 V 2.1 3.4 5.2 MHz
f
(DCO=27)
FN_8=0, FN_4=1, FN_3= FN_2=x; DCOPLUS = 1 3 V 16 26.6 41 MHz
f
(DCO=2)
FN_8=1, FN_4=FN_3=FN_2=x; DCOPLUS = 1 3 V 4.2 6.3 9.2 MHz
f
(DCO=27)
FN_8=1,FN_4=FN_3=FN_2=x; DCOPLUS = 1 3 V 30 46 70 MHz
S
Step size between adjacent DCO taps:
1 < TAP ≤ 20 1.06 1.11
S
n
Step
size
between
adjacent
DCO
taps:
S
n
= f
DCO(Tap n+1)
/ f
DCO(Tap n)
, (see Figure 12 for taps 21 to 27)
TAP = 27 1.07 1.17
D
t
Temperature drift, N
(DCO)
= 01Eh, FN_8=FN_4=FN_3=FN_2=0
D = 2; DCOPLUS = 0
3 V –0.2 –0.3 –0.4 %/_C
D
V
Drift with V
CC
variation, N
(DCO)
= 01Eh, FN_8=FN_4=FN_3=FN_2=0
D = 2; DCOPLUS = 0
0 5 15 %/V
T
A
− °CV
CC
− V
f
(DCO)
f
(DCO20
5
C)
f
(DCO)
f
(DCO3V)
1.8 3.02.4 3.6
1.0
20 6040 85
1.0
0−20−400
Figure 11. DCO Frequency vs Supply Voltage V
CC
and vs Ambient Temperature