MSP430FR5969_14 Datasheet, PDF (48/132 Pages) Texas Instruments – Mixed-Signal Microcontrollers

MSP430FR5969, MSP430FR59691, MSP430FR5968, MSP430FR5967
MSP430FR5959, MSP430FR5958, MSP430FR5957
MSP430FR5949, MSP430FR5948, MSP430FR5947, MSP430FR59471
SLAS704B – OCTOBER 2012 – REVISED MAY 2014
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5.14.5 Reference
Table 5-32. REF, Built-In Reference
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
REFVSEL = {2} for 2.5 V
REFON = 1
V_CC
2.7 V
MIN TYP MAX UNIT
2.5 ±1.5%
V_REF+
Positive built-in reference
voltage output
REFVSEL = {1} for 2.0 V
REFON = 1
2.2 V
2.0 ±1.5% V
Noise
RMS noise at VREF ⁽¹⁾
REFVSEL = {0} for 1.2 V
REFON = 1
From 0.1 Hz to 10 Hz, REFVSEL = {0}
1.8 V
1.2 ±1.8%
110 600 µV
V_{OS_BUF_INT}
VREF ADC BUF_INT buffer T_A = 25 °C , ADC ON, REFVSEL = {0},
offset ⁽²⁾
REFON = 1, REFOUT=0
-12
+12 mV
V_{OS_BUF_EXT}
VREF ADC BUF_EXT
buffer offset⁽³⁾
T_A = 25 °C, REFVSEL = {0} , REFOUT=1,
REFON = 1 or ADC ON
-12
+12 mV
AV_CC(min)
AVCC minimum voltage,
Positive built-in reference
active
REFVSEL = {0} for 1.2 V
REFVSEL = {1} for 2.0 V
REFVSEL = {2} for 2.5 V
1.8
2.2
V
2.7
I_REF+
Operating supply current
into AVCC terminal⁽⁴⁾
REFON = 1
3V
8
15 µA
ADC ON, REFOUT = 0, REFVSEL = {0, 1, 2},
ADC12PWRMD = 0,
3V
225 355
ADC ON, REFOUT = 1, REFVSEL = {0, 1, 2},
ADC12PWRMD = 0
3V
1030 1660
I_{REF+_ADC_BUF}
Operating supply current
into AVCC terminal⁽⁴⁾
ADC ON, REFOUT = 0, REFVSEL = {0, 1, 2},
ADC12PWRMD = 1
3V
120 185 µA
ADC ON, REFOUT = 1, REFVSEL = {0, 1, 2},
ADC12PWRMD = 1
3V
545 895
ADC OFF, REFON=1, REFOUT=1,
REFVSEL = {0, 1, 2}
3V
1085 1780
I_O(VREF+)
VREF maximum load
current, VREF+ terminal
REFVSEL = {0, 1, 2}, AVCC = AVCC(min) for
each reference level,
REFON = REFOUT = 1
-1000
+10 µA
ΔVout/ΔIo
(VREF+)
Load-current regulation,
VREF+ terminal
REFVSEL = {0, 1, 2},
I_O(VREF+) = +10 µA or -1000 µA
AVCC = AVCC(min) for each reference level,
REFON = REFOUT = 1
2500 µV/mA
C_VREF+/-
Capacitance at VREF+ and
VREF- terminals
REFON = REFOUT = 1
0
100 pF
TC_REF+
PSRR_DC
Temperature coefficient of
built-in reference
Power supply rejection ratio
(dc)
REFVSEL = {0, 1, 2}, REFON = REFOUT = 1,
T_A = -40 to 85 °C⁽⁵⁾
AV_CC = AV_{CC (min)} - AV_CC(max), T_A = 25°C
REFVSEL = {0, 1, 2}, REFON = REFOUT = 1
18
50 ppm/K
120 400 µV/V
PSRR_AC
Power supply rejection ratio
(ac)
dAV_CC= 0.1 V at 1 kHz
3.0
mV/V
t_SETTLE
Settling time of reference
voltage ⁽⁶⁾
AV_CC = AV_{CC (min)} - AV_CC(max)
REFVSEL = {0, 1, 2}, REFON = 0 → 1
75
80 µs
(1) Internal reference noise affects ADC performance when ADC uses internal reference. Refer to the application report Designing With the
MSP430FR59xx and MSP430FR58xx ADC (SLAA624) for details on optimizing ADC performance for your application with the choice of
internal versus external reference.
(2) Buffer offset affects ADC gain error and thus total unadjusted error.
(3) Buffer offset affects ADC gain error and thus total unadjusted error.
(4) The internal reference current is supplied through terminal AVCC.
(5) Calculated using the box method: (MAX(-40 to 85°C) – MIN(-40 to 85°C)) / MIN(-40 to 85°C)/(85°C – (–40°C)).
(6) The condition is that the error in a conversion started after t_REFON is less than ±0.5 LSB.
48
Specifications
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