Datasheet

DCO Frequency − MHz
0.10
1.00
10.00
0.10 1.00 10.00
DCO Wake Time − µs
RSELx = 0 to 11
RSELx = 12 to 15
MSP430F21x2
www.ti.com SLAS578J –NOVEMBER 2007– REVISED JANUARY 2012
Wake-Up From Lower-Power Modes (LPM3/4)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
BCSCTL1 = CALBC1_1MHZ,
2
DCOCTL = CALDCO_1MHZ
BCSCTL1 = CALBC1_8MHZ,
2.2 V/3 V 1.5
DCOCTL = CALDCO_8MHZ
DCO clock wake-up time
t
DCO,LPM3/4
µs
from LPM3/4
(1)
BCSCTL1 = CALBC1_12MHZ,
1
DCOCTL = CALDCO_12MHZ
BCSCTL1 = CALBC1_16MHZ,
3 V 1
DCOCTL = CALDCO_16MHZ
CPU wake-up time from 1 / f
MCLK
+
t
CPU,LPM3/4
LPM3/4
(2)
t
Clock,LPM3/4
(1) The DCO clock wake-up time is measured from the edge of an external wake-up signal (for example, a port interrupt) to the first clock
edge observable externally on a clock pin (MCLK or SMCLK).
(2) Parameter applicable only if DCOCLK is used for MCLK.
Typical Characteristics - DCO Clock Wake-Up Time From LPM3/4
CLOCK WAKE-UP TIME FROM LPM3
vs
DCO FREQUENCY
Figure 13.
DCO With External Resistor R
OSC
(1)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
DCOR = 1, 2.2 V 1.8
f
DCO,ROSC
DCO output frequency with R
OSC
RSELx = 4, DCOx = 3, MODx = 0, MHz
3 V 1.95
T
A
= 25°C
DCOR = 1,
D
T
Temperature drift 2.2 V/3 V ±0.1 %/°C
RSELx = 4, DCOx = 3, MODx = 0
DCOR = 1,
D
V
Drift with V
CC
2.2 V/3 V 10 %/V
RSELx = 4, DCOx = 3, MODx = 0
(1) R
OSC
= 100 kΩ. Metal film resistor, type 0257, 0.6 W with 1% tolerance and T
K
= ±50 ppm/°C.
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