MSP430F249-EP_14 Datasheet, PDF (34/82 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F249-EP
MIXED SIGNAL MICROCONTROLLER
2008
typical characteristics
AVCC
V(SVS_IT_−)
V(SVSstart)
V(B_IT_−)
VCC(start)
Brownout
1
Vhys(SVS_IT_−)
V_{hys(B_IT−)}
Brownout
Region
Software sets VLD >0:
SVS is active
0
SVS out
1
td(BOR)
SVS Circuit is Active From VLD > to V_CC < V(_{B_IT−)}
0
Set POR
1
0
td(SVSon)
undefined
td(SVSR)
Figure 12. SVS Reset (SVSR) vs Supply Voltage
VCC
t _pw
3V
Brown-
out
Region
td(BOR)
2
Rectangular Drop
1.5
Triangular Drop
VCC(min)
1
1 ns
1 ns
0.5
VCC
t _pw
3V
0
1
10
100
1000
t_pw − Pulse Width − μs
VCC(min)
t_f = t_r
t_f
t_r
t − Pulse Width − μs
Figure 13. V_CC(min): Square Voltage Drop and Triangle Voltage Drop to Generate an SVS Signal (VLD = 1)
34
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265