MSP430X20X1 Datasheet, PDF (39/80 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430x20x1, MSP430x20x2, MSP430x20x3
MIXED SIGNAL MICROCONTROLLER
SLAS491A − AUGUST 2005 − REVISED OCTOBER 2005
MSP430x20x2 electrical characteristics over recommended ranges of supply voltage and
operating free-air temperature (unless otherwise noted) (continued)
10-bit ADC, built-in voltage reference (MSP430x20x2 only)
PARAMETER
TEST CONDITIONS
VCC
MIN TYP MAX UNIT
VCC,REF+
Positive built-in reference analog
supply voltage range
VREF+
Positive built-in reference voltage
ILD,VREF+ Maximum VREF+ load current
IVREF+ ≤ 1mA, REF2_5V=0
2.2
VCC
IVREF+ ≤ 0.5mA, REF2_5V=1
VREF++0.15 VCC V
IVREF+ ≤ 1mA, REF2_5V=1
VREF++0.15 VCC
IVREF+ ≤ IVREF+max, REF2_5V=0 2.2 V/3 V 1.41 1.5 1.59 V
IVREF+ ≤ IVREF+max, REF2_5V=1
3V
2.35 2.5 2.65 V
2.2 V
3V
±0.5
mA
±1
VREF+ load regulation
IVREF+ = 500 µA +/− 100 µA
Analog input voltage VAx ≈ 0.75 V;
REF2_5V=0
IVREF+ = 500 µA ± 100 µA
Analog input voltage VAx ≈ 1.25 V;
REF2_5V=1
2.2 V/3 V
3V
±2 LSB
±2 LSB
CVREF+
VREF+ load regulation response time
Max. capacitance at pin VREF+
(see Note 1)
IVREF+ =
100µA→900µA,
VAx ≈ 0.5 x VREF+
Error of conversion
result ≤ 1 LSB
ADC10SR=0
ADC10SR=1
IVREF+ ≤ ±1mA,
REFON=1, REFOUT=1
3V
3V
2.2 V/3 V
400
ns
2000
100 pF
TCREF+
Temperature coefficient
IVREF+ = const. with
0 mA ≤ IVREF+ ≤ 1 mA
2.2 V/3 V
±100 ppm/°C
tREFON
Settling time of internal reference
voltage (see Note 2)
IVREF+ = 0.5 mA, REF2_5V=0
REFON = 0 → 1
3.6 V
30
Settling time of reference buffer
tREFBURST _{(see Note 2)}
IVREF+ = 0.5 mA,
REF2_5V=0,
REFON = 1,
REFBURST = 1
ADC10SR=0
ADC10SR=1
2.2 V
2.2 V
1 µs
2.5
NOTES: 1. The capacitance applied to the internal buffer operational amplifier, if switched to terminal P2.4/TA2/A4/VREF+/VeREF+ (REFOUT=1),
must be limited; the reference buffer may become unstable otherwise.
2. The condition is that the error in a conversion started after tREFON or tRefBuf is less than ±0.5 LSB.
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