MSP430FR6889 Datasheet, PDF (38/176 Pages) Texas Instruments – Mixed-Signal Microcontrollers

MSP430FR6889, MSP430FR68891, MSP430FR6888, MSP430FR6887
MSP430FR5889, MSP430FR58891, MSP430FR5888, MSP430FR5887
SLASE32A – AUGUST 2014 – REVISED MARCH 2015
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5.13 Timing and Switching Characteristics
5.13.1 Power Supply Sequencing
It is recommended to power the AVCC, DVCC, and ESIDVCC pins from the same source. At a minimum, during
power up, power down, and device operation, the voltage difference between AVCC, DVCC, and ESIDVCC 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.
At power up, the device does not start executing code before the supply voltage reached V_SVSH+ if the supply
rises monotonically to this level.
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
MAX UNIT
0.7
1.66
V
0
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 start-up 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 start-up
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
38
Specifications
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MSP430FR58891 MSP430FR5888 MSP430FR5887