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
MSP430BT5190
SLAS703A –APRIL 2010–REVISED AUGUST 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)
mV
T
A
= 0°C
3 V 680
2.2 V 2.25
TC
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
(3)
Error of conversion result ≤ 1 LSB
3 V 100
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
(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 MSP430x5xx and MSP430x6xx Family User's
Guide (SLAU208).
(3) The typical equivalent impedance of the sensor is 51 kΩ. 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 17. Typical Temperature Sensor Voltage
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