Ambient Temperature (°C)
500
550
600
650
700
750
800
850
900
950
1000
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80
T
ypical T
emperature Sensor V
oltage (mV)
MSP430F5338, MSP430F5336, MSP430F5335, MSP430F5333
SLAS721D – AUGUST 2010 – REVISED DECEMBER 2015
www.ti.com
5.39 12-Bit ADC, Temperature Sensor and Built-In V
MID
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
V
CC
MIN
TYP
MAX
UNIT
2.2 V
680
ADC12ON = 1, INCH = 0Ah,
V
SENSOR
See
(1)
mV
T
A
= 0°C
3 V
680
2.2 V
2.25
TC
SENSOR
Temperature coefficient of sensor
ADC12ON = 1, INCH = 0Ah
mV/°C
3 V
2.25
2.2 V
100
Sample time required if
ADC12ON = 1, INCH = 0Ah,
t
SENSOR(sample)
µs
channel 10 is selected
(2) (3)
Error of conversion result
≤
1 LSB
3 V
100
2.2 V
1.06
1.1
1.14
ADC12ON = 1, INCH = 0Bh,
V
MID
AV
CC
divider at channel 11
V
V
MID
is approximately 0.5 × V
AVCC
3 V
1.46
1.5
1.54
Sample time required if
ADC12ON = 1, INCH = 0Bh,
t
VMID(sample)
2.2 V, 3 V
1000
ns
channel 11 is selected
(4)
Error of conversion result
≤
1 LSB
(1)
The temperature sensor is provided by the REF module. See the REF module parametric, I
REF+
, regarding the current consumption of
the temperature sensor.
(2)
The temperature sensor offset can be significant. A single-point calibration is recommended to minimize the offset error of the built-in
temperature sensor. The TLV structure contains calibration values for 30°C ±3°C and 85°C ±3°C for each of the available reference
voltage levels. The sensor voltage can be computed as V
SENSE
= TC
SENSOR
× (Temperature,°C) + V
SENSOR
, where TC
SENSOR
and
V
SENSOR
can be computed from the calibration values for higher accuracy. See also the
MSP430F5xx and MSP430F6xx Family User's
Guide
(
SLAU208
).
(3)
The typical equivalent impedance of the sensor is 51 k
Ω
. The sample time required includes the sensor-on time t
SENSOR(on)
.
(4)
The on-time t
VMID(on)
is included in the sampling time t
VMID(sample)
; no additional on time is needed.
Figure 5-16. Typical Temperature Sensor Voltage
38
Specifications
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