MSP430F6638 Datasheet, PDF (47/126 Pages) Texas Instruments – Mixed-Signal Microcontrollers

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MSP430F6638, MSP430F6637, MSP430F6636, MSP430F6635
MSP430F6634, MSP430F6633, MSP430F6632, MSP430F6631, MSP430F6630
SLAS566E – JUNE 2010 – REVISED DECEMBER 2015
5.44 REF, Built-In Reference
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)⁽¹⁾
V_REF+
AV_CC(min)
I_REF+
PARAMETER
TEST CONDITIONS
REFVSEL = {2} for 2.5 V,
REFON = REFOUT = 1 ,
I_VREF+ = 0 A
Positive built-in reference
voltage output
REFVSEL = {1} for 2 V,
REFON = REFOUT = 1,
I_VREF+ = 0 A
REFVSEL = {0} for 1.5 V,
REFON = REFOUT = 1,
I_VREF+ = 0 A
AVCC minimum voltage, ^{REFVSEL = {0} for 1.5 V}
Positive built-in reference REFVSEL = {1} for 2 V
active
REFVSEL = {2} for 2.5 V
ADC12SR = 1⁽⁴⁾, REFON = 1, REFOUT = 0,
REFBURST = 0
Operating supply current
into AVCC terminal ^{(2) (3)}
ADC12SR = 1⁽⁴⁾, REFON = 1, REFOUT = 1,
REFBURST = 0
ADC12SR = 0⁽⁴⁾, REFON = 1, REFOUT = 0,
REFBURST = 0
ADC12SR = 0⁽⁴⁾, REFON = 1, REFOUT = 1,
REFBURST = 0
V_CC
MIN TYP
3V
2.5
3V
2.0
2.2 V, 3 V
3V
1.5
2.2
2.3
2.8
70
0.45
210
0.95
I_L(VREF+)
Load-current regulation,
VREF+ terminal⁽⁵⁾
C_VREF+
TC_REF+
TC_REF+
Capacitance at VREF+
terminal
Temperature coefficient
of built-in reference⁽⁷⁾
Temperature coefficient
of built-in reference⁽⁷⁾
PSRR_DC
Power supply rejection
ratio (DC)
REFVSEL = {0, 1, 2}
I_VREF+ = +10 µA , –1000 µA
AV_CC = AV_CC(min) for each reference level,
REFVSEL = {0, 1, 2}, REFON = REFOUT = 1
REFON = REFOUT = 1, ⁽⁶⁾
0 mA ≤ I_VREF+ ≤ I_VREF+(max)
I_VREF+ is a constant in the range
of 0 mA ≤ I_VREF+ ≤ –1 mA
REFOUT = 0
I_VREF+ is a constant in the range
of 0 mA ≤ I_VREF+ ≤ –1 mA
REFOUT = 1
AV_CC = AV_CC(min) through AV_CC(max),
T_A = 25°C, REFVSEL = {0, 1, 2}, REFON = 1,
REFOUT = 0 or 1
2.2 V, 3 V
2.2 V, 3 V
2.2 V, 3 V
1500
20
20
20
120
PSRR_AC
Power supply rejection
ratio (AC)
AV_CC = AV_CC(min) through AV_CC(max),
T_A = 25°C, REFVSEL = {0, 1, 2}, REFON = 1,
REFOUT = 0 or 1
1
AV_CC = AV_CC(min) through AV_CC(max),
REFVSEL = {0, 1, 2}, REFOUT = 0,
75
REFON = 0 → 1
t_SETTLE
Settling time of reference
voltage ⁽⁸⁾
AV_CC = AV_CC(min) through AV_CC(max),
C_VREF = C_VREF(max),
REFVSEL = {0, 1, 2}, REFOUT = 1,
75
REFON = 0 → 1
MAX UNIT
±1%
±1% V
±1%
V
100 µA
0.75 mA
310 µA
1.7 mA
2500 µV/mA
100 pF
ppm/
°C
50
ppm/
°C
300 µV/V
mV/V
µs
(1) The reference is supplied to the ADC by the REF module and is buffered locally inside the ADC. The ADC uses two internal buffers, one
smaller and one larger for driving the V_REF+ terminal. When REFOUT = 1, the reference is available at the V_REF+ terminal, as well as,
used as the reference for the conversion and uses the larger buffer. When REFOUT = 0, the reference is only used as the reference for
the conversion and uses the smaller buffer.
(2) The internal reference current is supplied by the AVCC terminal. Consumption is independent of the ADC12ON control bit, unless a
conversion is active. REFOUT = 0 represents the current contribution of the smaller buffer. REFOUT = 1 represents the current
contribution of the larger buffer without external load.
(3) The temperature sensor is provided by the REF module. Its current is supplied by terminal AVCC and is equivalent to I_REF+ with
REFON = 1 and REFOUT = 0.
(4) For devices without the ADC12, the parametric with ADC12SR = 0 are applicable.
(5) Contribution only due to the reference and buffer including package. This does not include resistance due to PCB traces or other
external factors.
(6) Connect two decoupling capacitors, 10 µF and 100 nF, to VREF to decouple the dynamic current required for an external reference
source if it is used for the ADC12_A. See also the MSP430x5xx and MSP430x6xx Family User's Guide (SLAU208).
(7) 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)).
(8) The condition is that the error in a conversion started after t_REFON is less than ±0.5 LSB. The settling time depends on the external
capacitive load when REFOUT = 1.
Copyright © 2010–2015, Texas Instruments Incorporated
Specifications
47
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