MSP430FR6889 Datasheet, PDF (62/176 Pages) Texas Instruments – Mixed-Signal Microcontrollers

MSP430FR6889, MSP430FR68891, MSP430FR6888, MSP430FR6887
MSP430FR5889, MSP430FR58891, MSP430FR5888, MSP430FR5887
SLASE32A – AUGUST 2014 – REVISED MARCH 2015
www.ti.com
5.13.5.6 Reference
Table 5-34. REF, Built-In Reference
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
V_REF+
Noise
PARAMETER
Positive built-in reference
voltage output
RMS noise at VREF⁽¹⁾
TEST CONDITIONS
REFVSEL = {2} for 2.5 V, REFON = 1
REFVSEL = {1} for 2.0 V, REFON = 1
REFVSEL = {0} for 1.2 V, REFON = 1
From 0.1 Hz to 10 Hz, REFVSEL = {0}
V_CC
2.7 V
2.2 V
1.8 V
MIN TYP MAX UNIT
2.5 ±1.5%
2.0 ±1.5% 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°C 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°C to 85°C) – MIN(–40°C to 85°C)) / MIN(–40°C 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.
62
Specifications
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