Datasheet

700
750
800
850
900
950
1000
1050
1100
1150
1200
1250
-40 -25 -10 5 20 35 50 65 80
Typical Temperature Sensor Voltage - mV
AmbientTemperature- ˚C
MSP430F5438, MSP430F5437, MSP430F5436, MSP430F5435
MSP430F5419, MSP430F5418
www.ti.com SLAS612D –AUGUST 2009–REVISED AUGUST 2013
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 150
Operating supply current into REFON = 0, INCH = 0Ah,
I
SENSOR
µA
AVCC terminal
(1)
ADC12ON = N/A, T
A
= 25°C
3 V 150
2.2 V 894
ADC12ON = 1, INCH = 0Ah,
V
SENSOR
See
(2)
mV
T
A
= 0°C
3 V 894
2.2 V 3.66
TC
SENSOR
ADC12ON = 1, INCH = 0Ah mV/°C
3 V 3.66
2.2 V 30
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 30
2.2 V 1.1
ADC12ON = 1, INCH = 0Bh,
V
MID
AV
CC
divider at channel 11 V
V
MID
is approximately 0.5 × V
AVCC
3 V 1.5
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 sensor current I
SENSOR
is consumed if (ADC12ON = 1 and REFON = 1) or (ADC12ON = 1 and INCH = 0Ah and sample signal is
high). When REFON = 1, I
SENSOR
is already included in I
REF+
.
(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.
(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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