MSP430FR5969_14 Datasheet, PDF (25/132 Pages) Texas Instruments – Mixed-Signal Microcontrollers

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SLAS704B – OCTOBER 2012 – REVISED MAY 2014
5.12 Timing and Switching Characteristics
5.12.1 Power Supply Sequencing
It is recommended to power AVCC and DVCC pins from the same source. At a minimum, during power up,
power down, and device operation, the voltage difference between AVCC and DVCC must not exceed the limits
specified in Absolute Maximum Ratings. Exceeding the specified limits may cause malfunction of the device
including erroneous writes to RAM and FRAM.
Table 5-1. Brownout and Device Reset Power Ramp Requirements
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
V_{VCC_BOR–}
V_{VCC_BOR+}
PARAMETER
Brownout power-down level⁽¹⁾⁽²⁾
Brownout power-up level⁽²⁾
TEST CONDITIONS
| dDV_CC/d_t | < 3 V/s⁽³⁾
| dDV_CC/d_t | > 300 V/s⁽³⁾
| dDV_CC/d_t | < 3 V/s⁽⁴⁾
MIN
TYP MAX UNIT
0.7
1.66 V
0
V
0.79
1.68 V
(1) In case of a supply voltage brownout scenario, the device supply voltages need to ramp down to the specified brownout power-down
level V_{VCC_BOR-} before the voltage is ramped up again to ensure a reliable device startup and performance according to the data sheet
including the correct operation of the on-chip SVS module.
(2) Fast supply voltage changes can trigger a BOR reset even within the recommended supply voltage range. To avoid unwanted BOR
resets, the supply voltage must change by less than 0.05 V per microsecond (±0.05 V/µs). Following the data sheet recommendation for
capacitor C_DVCC should limit the slopes accordingly.
(3) The brownout levels are measured with a slowly changing supply. With faster slopes the MIN level required to reset the device properly
can decrease to 0 V. Use the graph in Figure 5-6 to estimate the V_{VCC_BOR-} level based on the down slope of the supply voltage. After
removing VCC the down slope can be estimated based on the current consumption and the capacitance on DVCC: dV/dt = I/C with
dV/dt: slope, I: current, C: capacitance.
(4) The brownout levels are measured with a slowly changing supply.
2
Process-Temp. Corner Case 1
1.5
Typical
1
Process-Temp. Corner Case 2
MIN Limit
0.5
V_{VCC_BOR-} for reliable
device startup.
0
1
10
100
1000
10000
100000
Supply Voltage Power Down Slope [V/s]
Figure 5-6. Brownout Power-Down Level vs Supply Voltage Down Slope
Table 5-2. SVS
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
I_SVSH,LPM
V_SVSH-
V_SVSH+
V_{SVSH_hys}
t_{PD,SVSH, AM}
SVS_H current consumption, low power modes
SVS_H power-down level
SVS_H power-up level
SVS_H hysteresis
SVS_H propagation delay, active mode
dV_Vcc/dt = -10 mV/µs
170
1.75
1.80
1.77
1.88
40
MAX
300
1.85
1.99
120
10
UNIT
nA
V
V
mV
µs
Copyright © 2012–2014, Texas Instruments Incorporated
Specifications
25
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