MSP430X20X1 Datasheet, PDF (26/80 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430x20x1, MSP430x20x2, MSP430x20x3
MIXED SIGNAL MICROCONTROLLER
SLAS491A − AUGUST 2005 − REVISED OCTOBER 2005
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (continued)
POR/brownout reset (BOR) (see Notes 1 and 2)
PARAMETER
TEST CONDITIONS
VCC
MIN TYP MAX UNIT
VCC(start)
V(B_IT−)
Vhys(B_IT−)
td(BOR)
t(reset)
(see Figure 8)
(see Figure 8 through Figure 10)
(see Figure 8)
(see Figure 8)
Pulse length needed at RST/NMI pin
to accepted reset internally
dVCC/dt ≤ 3 V/s
dVCC/dt ≤ 3 V/s
dVCC/dt ≤ 3 V/s
2.2 V/3 V
0.7 × V(B_IT−)
V
1.71 V
70 130 180 mV
2000 µs
2
µs
NOTES: 1. The current consumption of the brownout module is already included in the ICC current consumption data. The voltage level V(B_IT−)
+ Vhys(B_IT−) is ≤ 1.8V.
2. During power up, the CPU begins code execution following a period of td(BOR) after VCC = V(B_IT−) + Vhys(B_IT−). The default
DCO settings must not be changed until VCC ≥ VCC(min), where VCC(min) is the minimum supply voltage for the desired
operating frequency.
VCC
Vhys(B_IT−)
V(B_IT−)
VCC(start)
1
0
t _d(BOR)
Figure 8. POR/Brownout Reset (BOR) vs Supply Voltage
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