Datasheet

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SLAS491A − AUGUST 2005 − REVISED OCTOBER 2005
42
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
MSP430x20x2 electrical characteristics over recommended ranges of supply voltage and
operating free-air temperature (unless otherwise noted) (continued)
10-bit ADC, temperature sensor and built-in V
MID
(MSP430x20x2 only)
PARAMETER TEST CONDITIONS VCC MIN TYP MAX UNIT
I
SENSOR
Temperature sensor supply
REFON = 0, INCHx = 0Ah,
2.2 V 40 120
A
I
SENSOR
Temperature sensor supply
current (see Note 1)
REFON = 0, INCHx = 0Ah,
T
A
= 25_C
3 V 60 160
µA
TC
SENSOR
ADC10ON = 1, INCHx = 0Ah
(see Notes 2, 3)
2.2 V/3 V 3.44 3.55 3.66 mV/°C
V
Offset,Sensor
Sensor offset voltage
ADC10ON = 1, INCHx = 0Ah
(see Notes 2, 3)
−100 100 mV
Temperature sensor voltage
at T
A
= 85°C
2.2 V/3 V TBD TBD TBD
V
Sensor
Sensor output voltage
(see Note 4)
Temperature sensor voltage
at T
A
= 25°C
2.2 V/3 V TBD TBD TBD
mV
(see Note 4)
Temperature sensor voltage
at T
A
= 0°C (see Note 2)
2.2 V/3 V 935 985 1035
t
Sensor(sample)
Sample time required if
channel 10 is selected (see
Note 5)
ADC10ON = 1, INCHx = 0Ah,
Error of conversion result 1 LSB
2.2 V/3 V 30 µs
I
VMID
Current into divider at channel
ADC10ON = 1, INCHx = 0Bh,
2.2 V NA
A
I
VMID
Current into divider at channel
11 (see Note 6)
ADC10ON = 1, INCHx = 0Bh,
3 V NA
µA
V
MID
V
CC
divider at channel 11
ADC10ON = 1, INCHx = 0Bh,
2.2 V 1.06 1.1 1.14
V
V
MID
V
CC
divider at channel 11
ADC10ON = 1, INCHx = 0Bh,
V
MID
is 0.5 x V
CC
3 V 1.46 1.5 1.54
V
t
VMID(sample)
Sample time required if
channel 11 is selected (see
ADC10ON = 1, INCHx = 0Bh,
2.2 V 1400
ns
t
VMID(sample
)
channel 11 is selected (see
Note 7)
ADC10ON = 1, INCHx = 0Bh,
Error of conversion result 1 LSB
3 V 1220
ns
Not production tested, limits characterized
NOTES: 1. The sensor current I
SENSOR
is consumed if (ADC10ON = 1 and REFON = 1), or (ADC10ON=1 and INCH=0Ah and sample signal
is high). When REFON = 1, I
SENSOR
is included in I
REF+
. When REFON = 0, I
SENSOR
applies during conversion of the temperature
sensor input (INCH = 0Ah).
2. Not production tested, limits characterized.
3. The following formula can be used to calculate the temperature sensor output voltage:
V
Sensor,typ
= TC
Sensor
( 273 + T [°C] ) + V
Offset,sensor
[mV] or
V
Sensor,typ
= TC
Sensor
T [°C] + V
Sensor
(T
A
= 0°C) [mV]
4. Results based on characterization and/or production test, not TC
Sensor
or V
Offset,sensor
.
5. The typical equivalent impedance of the sensor is 51 k. The sample time required includes the sensor-on time t
SENSOR(on)
.
6. No additional current is needed. The V
MID
is used during sampling.
7. The on-time t
VMID(on)
is included in the sampling time t
VMID(sample)
; no additional on time is needed.