Datasheet

MSP430x43x1, MSP430x43x, MSP430x44x1, MSP430x44x
MIXED SIGNAL MICROCONTROLLER
SLAS344G − JANUARY 2002 − REVISED OCTOBER 2009
45
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature (unless otherwise
noted) (continued)
POR/brownout reset (BOR) (see Note 1)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
d(BOR)
2000 µs
V
CC(start)
dV
CC
/dt ≤ 3 V/s (see Figure 10) 0.7 × V
(B_IT−)
V
V
(B_IT−)
Brownout
dV
CC
/dt ≤ 3 V/s (see Figure 10 through Figure 12) 1.71 V
V
hys(B_IT−)
(see Note 2)
dV
CC
/dt ≤ 3 V/s (see Figure 10) 70 130 180 mV
t
(reset)
Pulse length needed at RST/NMI pin to accepted reset internally,
V
CC
= 2.2 V/3 V
2 µs
NOTES: 1. The current consumption of the brownout module is already included in the I
CC
current consumption data. The voltage level
V
(B_IT−)
+ V
hys(B_IT−)
is ≤ 1.8V.
2. 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 FLL+
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. See the MSP430x4xx Family User’s Guide (SLAU056) for more information on the brownout/SVS circuit.
typical characteristics
0
1
t
d(BOR)
V
CC
V
(B_IT−)
V
hys(B_IT−)
V
CC(start)
Figure 10. POR/Brownout Reset (BOR) vs Supply Voltage
V
CC(drop)
V
CC
3 V
t
pw
0
0.5
1
1.5
2
0.001 1 1000
Typical Conditions
1 ns 1 ns
t
pw
− Pulse Width − µst
pw
− Pulse Width − µs
V
CC
= 3 V
V
CC(drop)
− V
Figure 11. V
CC(drop)
Level With a Square Voltage Drop to Generate a POR/Brownout Signal