Datasheet
MSP430F6638, MSP430F6637, MSP430F6636
MSP430F6635, MSP430F6634, MSP430F6633
MSP430F6632, MSP430F6631, MSP430F6630
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SLAS566D –JUNE 2010–REVISED AUGUST 2013
REF, Built-In Reference
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
(1)
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
REFVSEL = {2} for 2.5 V,
REFON = REFOUT = 1 , 3 V 2.5 ±1%
I
VREF+
= 0 A
REFVSEL = {1} for 2 V,
Positive built-in reference
V
REF+
REFON = REFOUT = 1, 3 V 2.0 ±1% V
voltage output
I
VREF+
= 0 A
REFVSEL = {0} for 1.5 V,
REFON = REFOUT = 1, 2.2 V, 3 V 1.5 ±1%
I
VREF+
= 0 A
REFVSEL = {0} for 1.5 V 2.2
AV
CC
minimum voltage,
AV
CC(min)
Positive built-in reference REFVSEL = {1} for 2 V 2.3 V
active
REFVSEL = {2} for 2.5 V 2.8
ADC12SR = 1
(4)
, REFON = 1, REFOUT = 0,
3 V 70 100 µA
REFBURST = 0
ADC12SR = 1
(4)
, REFON = 1, REFOUT = 1,
3 V 0.45 0.75 mA
REFBURST = 0
Operating supply current
I
REF+
into AV
CC
terminal
(2) (3)
ADC12SR = 0
(4)
, REFON = 1, REFOUT = 0,
3 V 210 310 µA
REFBURST = 0
ADC12SR = 0
(4)
, REFON = 1, REFOUT = 1,
3 V 0.95 1.7 mA
REFBURST = 0
REFVSEL = {0, 1, 2}
Load-current regulation, I
VREF+
= +10 µA / -1000 µA
I
L(VREF+)
1500 2500 µV/mA
V
REF+
terminal
(5)
AV
CC
= AV
CC(min)
for each reference level,
REFVSEL = {0, 1, 2}, REFON = REFOUT = 1
Capacitance at V
REF+
REFON = REFOUT = 1,
(6)
C
VREF+
2.2 V, 3 V 20 100 pF
terminal 0 mA ≤ I
VREF+
≤ I
VREF+
(max)
Temperature coefficient I
VREF+
is a constant in the range ppm/
TC
REF+
REFOUT = 0 2.2 V, 3 V 20
of built-in reference
(7)
of 0 mA ≤ I
VREF+
≤ –1 mA °C
Temperature coefficient I
VREF+
is a constant in the range ppm/
TC
REF+
REFOUT = 1 2.2 V, 3 V 20 50
of built-in reference
(7)
of 0 mA ≤ I
VREF+
≤ –1 mA °C
AV
CC
= AV
CC(min)
- AV
CC(max)
,
Power supply rejection
PSRR_DC T
A
= 25°C, REFVSEL = {0, 1, 2}, REFON = 1, 120 300 µV/V
ratio (dc)
REFOUT = 0 or 1
AV
CC
= AV
CC(min)
- AV
CC(max)
,
Power supply rejection
PSRR_AC T
A
= 25°C, REFVSEL = {0, 1, 2}, REFON = 1, 1 mV/V
ratio (ac)
REFOUT = 0 or 1
(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 utilizes the larger buffer. When REFOUT = 0, the reference is only used as the reference
for the conversion and utilizes the smaller buffer.
(2) The internal reference current is supplied via terminal AV
CC
. 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 via 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) Two decoupling capacitors, 10 µF and 100 nF, should be connected 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 to 85°C) – MIN(-40 to 85°C)) / MIN(-40 to 85°C)/(85°C – (–40°C)).
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