Datasheet

0
1
t
d(BOR)
V
CC
V
(B_IT−)
V
hys(B_IT−)
V
CC(start)
MSP430F21x1
SLAS439F –SEPTEMBER 2004– REVISED AUGUST 2011 www.ti.com
POR/Brownout Reset (BOR)
(1)(2)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS T
A
V
CC
MIN TYP MAX UNIT
0.7 ×
V
CC(start)
See Figure 8 dV
CC
/dt ≤ 3 V/s V
V
(B_IT-)
See Figure 8 through
V
(B_IT-)
dV
CC
/dt ≤ 3 V/s 1.71 V
Figure 10
-40°C to 85°C 70 130 180
V
hys(B_IT-)
See Figure 8 dV
CC
/dt ≤ 3 V/s mV
105°C 70 130 210
t
d(BOR)
See Figure 8 2000 µs
Pulse length needed at
t
(reset)
RST/NMI pin to accepted 2.2 V/3 V 2 µs
reset internally
(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 ≤ 1.8 V.
(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 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 8. POR/Brownout Reset (BOR) vs Supply Voltage
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