Datasheet

0
1
t
d(BOR)
V
CC
V
(B_IT−)
V
hys(B_IT−)
V
CC(start)
MSP430F21x2
www.ti.com SLAS578J –NOVEMBER 2007– REVISED JANUARY 2012
POR/Brownout Reset (BOR)
(1)(2)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
0.7 ×
V
CC(start)
See Figure 9 dV
CC
/dt ≤ 3 V/s V
V
(B_IT-)
V
(B_IT-)
See Figure 9 through Figure 11 dV
CC
/dt ≤ 3 V/s 1.71 V
V
hys(B_IT-)
See Figure 9 dV
CC
/dt ≤ 3 V/s 70 130 210 mV
t
d(BOR)
See Figure 9 2000 µs
Pulse length needed at RST/NMI pin
t
(reset)
2.2 V/3 V 2 µs
to accepted 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 9. POR/Brownout Reset (BOR) vs Supply Voltage
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