MSP430F643 Datasheet, PDF (67/106 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F643x
www.ti.com
SLAS720B – AUGUST 2010 – REVISED AUGUST 2012
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
AV_CC 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 AV_CC 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
3V
3V
3V
1.5
2.2
2.3
2.8
70
0.45
210
0.95
I_L(VREF+)
Load-current regulation,
V_REF+ terminal⁽⁵⁾
C_VREF+
TC_REF+
TC_REF+
Capacitance at V_REF+
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) - 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) - AV_CC(max),
T_A = 25°C, REFVSEL = {0, 1, 2}, REFON = 1,
REFOUT = 0 or 1
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
(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)).
Copyright © 2010–2012, Texas Instruments Incorporated
67