MSP430FG439 Datasheet, PDF (21/88 Pages) Texas Instruments – Mixed-Signal Microcontrollers

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MSP430FG439, MSP430FG438, MSP430FG437
SLAS380D – APRIL 2004 – REVISED NOVEMBER 2014
5.16 Power-On Reset (POR) and Brownout Reset (BOR)⁽¹⁾
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP MAX UNIT
t_d(BOR)
V_CC(start)
V_{(B_IT–)}
Brownout ⁽²⁾
dV_CC/dt ≤ 3 V/s (see Figure 5-10)
dV_CC/dt ≤ 3 V/s (see Figure 5-10 through
Figure 5-12)
2000 µs
0.7 × V_{(B_IT– )}
V
1.71 V
V_{hys(B_IT–)}
t_(reset)
dV_CC/dt ≤ 3 V/s (see Figure 5-10)
70
Pulse length needed at RST/NMI pin to accepted
reset internally, V_CC = 2.2 V, 3 V
2
130
210 mV
µs
(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 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.
V_CC
V_{hys(B_IT-)}
V_{(B_IT-)}
V_CC(start)
1
0
2
V_CC = 3 V
Typical Conditions
1.5
t_d(BOR)
Figure 5-10. POR and BOR vs Supply Voltage
V _CC
tpw
3V
1
V _CC(drop)
0.5
0
0.001
1
t_pw - Pulse Width - m s
1000
1 ns
1 ns
t_pw - Pulse Width - ms
Figure 5-11. V_CC(drop) Level with a Square Voltage Drop to Generate a POR or BOR Signal
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Specifications
21