Ambient Temperature (°C)
Typic
a
l Te
mper
a
tur
e
Sensor Volt
a
g
e
(mV)
-40
-20
0
20
40
60
80
100
600
625
650
675
700
725
750
775
800
825
850
875
D020
67
SLAS826F – MARCH 2015 – REVISED MARCH 2017
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Specifications
Copyright © 2015–2017, Texas Instruments Incorporated
lists the characteristics of the temperature sensor and built-in V
1/2
.
(1)
The temperature sensor offset can be as much as ±35°C. TI recommends a single-point calibration to minimize the offset error of the
built-in temperature sensor.
(2)
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.
(3)
The typical equivalent impedance of the sensor is 250 k
Ω
. The sample time required includes the sensor-on time t
SENSOR(on)
.
(4)
The on-time t
V1/2(on)
is included in the sampling time t
V 1/2 (sample)
. No additional on time is needed.
Table 5-30. 14-Bit ADC, Temperature Sensor and Built-In V
1/2
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
V
CC
MIN
TYP
MAX
UNIT
V
SENSOR
See
(1) (2)
ADC14ON = 1, ADC14TCMAP = 1,
T
A
= 0°C
685
mV
TC
SENSOR
See
(2)
ADC14ON = 1, ADC14TCMAP = 1
1.9
mV/°C
t
SENSOR
(sample)
Sample time required if ADCTCMAP
= 1 and channel (MAX – 1) is
selected
(3)
ADC14ON = 1, ADC14TCMAP = 1,
Error of conversion result
≤
1 LSB
5
µs
V
1/2
AVCC voltage divider for
ADC14BATMAP = 1 on MAX input
channel
ADC14ON = 1, ADC14BATMAP = 1
48%
50%
52%
t
V 1/2
(sample)
Sample time required if
ADC14BATMAP = 1 and channel
MAX is selected
(4)
ADC14ON = 1, ADC14BMAP = 1
1
µs
Figure 5-29. Typical Temperature Sensor Voltage