Datasheet

MSP430F42xA
MIXED SIGNAL MICROCONTROLLER
SLAS587 -- FEBRUARY 2008
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
3V 1 MHz
f
(DCO = 2)
FN_8 = FN_4 = FN_3 = FN_2 = 0, DCOPLUS = 1 3V 0.3 0.7 1.3 MHz
f
(DCO = 27)
FN_8 = FN_4 = FN_3 = FN_2 = 0, DCOPLUS = 1 3V 2.7 6.1 11.3 MHz
f
(DCO = 2)
FN_8 = FN_4 = FN_3 = 0, FN_2 = 1, DCOPLUS = 1 3V 0.8 1.5 2.5 MHz
f
(DCO = 27)
FN_8 = FN_4 = FN_3 = 0, FN_2 = 1, DCOPLUS = 1 3V 6.5 12.1 20 MHz
f
(DCO = 2)
FN_8 = FN_4 = 0, FN_3 = 1, FN_2 = x, DCOPLUS = 1 3V 1.3 2.2 3.5 MHz
f
(DCO = 27)
FN_8 = FN_4 = 0, FN_3 = 1, FN_2 = x, DCOPLUS = 1 3V 10.3 17.9 28.5 MHz
f
(DCO = 2)
FN_8 = 0, FN_4 = 1, FN_3 = FN_2 = x, DCOPLUS = 1 3V 2.1 3.4 5.2 MHz
f
(DCO = 27)
FN_8 = 0, FN_4 = 1, FN_3 = FN_2 = x, DCOPLUS = 1 3V 16 26.6 41 MHz
f
(DCO = 2)
FN_8 = 1, FN_4 = FN_3 = FN_2 = x, DCOPLUS = 1 3V 4.2 6.3 9.2 MHz
f
(DCO = 27)
FN_8 = 1, FN_4 = FN_3 = FN_2 = x, DCOPLUS = 1 3V 30 46 70 MHz
S
Step size between adjacent DCO taps:
S
f
/
f
1<TAP≤ 20 1.06 1.11
S
n
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
3V –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
°
C)
f
(DCO)
f
(DCO3V)
1.8 3.02.4 3.6
1.0
20 6040 85
1.0
0-- 2 0-- 4 00
Figure 11. DCO Frequency vs Supply Voltage V
CC
and vs Ambient Temperature