MSP430F663x
SLAS566C –JUNE 2010–REVISED AUGUST 2012
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1000
950
900
850
800
750
700
650
600
550
500
-40 -30 -20 -10
0 10 20 30 40 50 60 70 80
Ambient Temperature - ˚C
Figure 16. Typical Temperature Sensor Voltage
REF, External Reference
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)(1)
PARAMETER
TEST CONDITIONS
VCC
MIN
TYP
MAX UNIT
Positive external
reference voltage input
(2)
VeREF+
VeREF+ > VREF–/VeREF–
1.4
AVCC
1.2
V
V
V
Negative external
reference voltage input
(3)
(4)
VREF–/VeREF–
VeREF+ > VREF–/VeREF–
VeREF+ > VREF–/VeREF–
0
VeREF+
VREF–/VeREF–
–
Differential external
reference voltage input
1.4
AVCC
1.4 V ≤ VeREF+ ≤ VAVCC , VeREF– = 0 V,
fADC12CLK = 5 MHz, ADC12SHTx = 1h,
Conversion rate 200 ksps
2.2 V, 3 V
2.2 V, 3 V
-26
26
µA
IVeREF+
IVREF–/VeREF–
,
Static input current
1.4 V ≤ VeREF+ ≤ VAVCC , VeREF– = 0 V,
fADC12CLK = 5 MHZ, ADC12SHTx = 8h,
Conversion rate 20 ksps
-1.2
10
+1.2
µA
µF
Capacitance at VREF+/-
terminal(5)
CVREF+/-
(1) The external reference is used during ADC conversion to charge and discharge the capacitance array. The input capacitance, Ci, is also
the dynamic load for an external reference during conversion. The dynamic impedance of the reference supply should follow the
recommendations on analog-source impedance to allow the charge to settle for 12-bit accuracy.
(2) The accuracy limits the minimum positive external reference voltage. Lower reference voltage levels may be applied with reduced
accuracy requirements.
(3) The accuracy limits the maximum negative external reference voltage. Higher reference voltage levels may be applied with reduced
accuracy requirements.
(4) The accuracy limits minimum external differential reference voltage. Lower differential reference voltage levels may be applied with
reduced accuracy requirements.
(5) 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).
72
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