MSP430F249-EP_14 Datasheet, PDF (31/82 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)
POR/brownout reset (BOR) (see Notes 3 and 4)
PARAMETER
TEST CONDITIONS
VCC
MIN TYP MAX UNIT
V_CC(start) Operating voltage
dV_CC/dt  3 V/s
0.7  V_{(B_IT−)}
V
V_{(B_IT−)} Negative going V_CC reset threshold voltage
dV_CC/dt  3 V/s
1.71 V
V_{hys(B_IT−)} V_CC reset threshold hysteresis
dV_CC/dt  3 V/s
70 130 210 mV
t_d(BOR)
BOR reset release delay time
2000 μs
t_reset
Pulse length at RST/NMI pin to accept a reset
2.2 V / 3 V
2
μs
NOTES:
3. The current consumption of the brownout module is included in the I_CC current consumption data. The voltage level V_{(B_IT−)} +
V_{hys(B_IT−)} is ≤ 1.8 V.
4. During power-up, the CPU begins code execution following a period of t_d(BOR) after V_CC = V_{(B_IT−)} + V_{hys(B_IT−)}. The default DCO
settings must not be changed until V_CC ≥ V_CC(MIN), where V_CC(min) is the minimum supply voltage for the desired operating
frequency.
Figure 9. POR/Brownout Reset (BOR) vs Supply Voltage
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