Datasheet
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-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
Typical Temperature Sensor Voltage
- mV
Ambient Temperature - ˚C
ECCN 5E002 TSPA - Technology / Software Publicly Available
CC430F6137, CC430F6135, CC430F6127, CC430F6126, CC430F6125
CC430F5137, CC430F5135, CC430F5133
SLAS554H –MAY 2009–REVISED SEPTEMBER 2013
www.ti.com
12-Bit ADC, Temperature Sensor and Built-In V
MID
(1)
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
(2) (3)
mV
T
A
= 0°C
3 V 680
2.2 V 2.25
TC
SENSOR
See
(3)
ADC12ON = 1, INCH = 0Ah mV/°C
3 V 2.25
2.2 V 30
Sample time required if ADC12ON = 1, INCH = 0Ah,
t
SENSOR(sample)
µs
channel 10 is selected
(4)
Error of conversion result ≤ 1 LSB
3 V 30
AV
CC
divider at channel 11,
ADC12ON = 1, INCH = 0Bh 0.48 0.5 0.52 V
AVCC
V
AVCC
factor
V
MID
2.2 V 1.06 1.1 1.14
AV
CC
divider at channel 11 ADC12ON = 1, INCH = 0Bh V
3 V 1.44 1.5 1.56
Sample time required if ADC12ON = 1, INCH = 0Bh,
t
VMID(sample)
2.2 V, 3 V 1000 ns
channel 11 is selected
(5)
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 as much as ± 20° C. A single-point calibration is recommended to minimize the offset error of the
built-in temperature sensor.
(3) The device descriptor 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.
(4) The typical equivalent impedance of the sensor is 51 kΩ. The sample time required includes the sensor-on time t
SENSOR(on)
.
(5) The on-time t
VMID(on)
is included in the sampling time t
VMID(sample)
; no additional on time is needed.
Figure 20. Typical Temperature Sensor Voltage
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