MSP430F249-EP_14 Datasheet, PDF (41/82 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F249-EP
MIXED SIGNAL MICROCONTROLLER
2008
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (continued)
DCO with external resistor R_OSC (see Note 1)
PARAMETER
TEST CONDITIONS
f_DCO,ROSC
DCO output frequency with R_OSC
D_t
Temperature drift
DCOR = 1,
RSELx = 4, DCOx = 3, MODx = 0,
T_A = 25°C
DCOR = 1,
RSELx = 4, DCOx = 3, MODx = 0
D_V
Drift with V_CC
DCOR = 1,
RSELx = 4, DCOx = 3, MODx = 0
NOTE 1: R_OSC = 100 kΩ, metal film resistor, type 0257. 0.6 W with 1% tolerance, and T_K = ±50 ppm/°C.
typical characteristics − DCO with external resistor R_OSC
10.00
10.00
VCC
2.2 V
3V
2.2 V/3 V
TYP UNIT
1.8
MHz
1.95
±0.1 %/°C
2.2 V/3 V
10 %/V
1.00
1.00
0.10
0.10
RSELx = 4
RSELx = 4
0.01
10.00
100.00
1000.00
10000.00
R_OSC − External Resistor − kW
Figure 19. DCO Frequency vs R_OSC,
V_CC = 2.2 V, T_A = 255C
2.50
2.25
2.00
R_OSC = 100k
1.75
1.50
1.25
1.00
0.75
R_OSC = 270k
0.50
0.25
R_OSC = 1M
0.00
−50.0 −25.0 0.0 25.0 50.0 75.0 100.0
T_A − Temperature − 5C
Figure 21. DCO Frequency vs Temperature,
V_CC = 3 V
0.01
10.00
100.00
1000.00
10000.00
R_OSC − External Resistor − kW
Figure 20. DCO Frequency vs R_OSC,
V_CC = 3 V, T_A = 255C
2.50
2.25
2.00
R_OSC = 100k
1.75
1.50
1.25
1.00
0.75
R_OSC = 270k
0.50
0.25
R_OSC = 1M
0.00
2.0
2.5
3.0
3.5
4.0
V_CC − Supply Voltage − V
Figure 22. DCO Frequency vs V_CC,
T_A = 255C
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