MSP430FR573x
MSP430FR572x
SLAS639D –JULY 2011–REVISED AUGUST 2012
www.ti.com
REF, Temperature Sensor and Built-In VMID
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
MIN
TYP
790
MAX UNIT
mV
ADC10ON = 1, INCH = 0Ah,
TA = 0°C
(1)
VSENSOR
See
2 V, 3 V
TCSENSOR
ADC10ON = 1, INCH = 0Ah
2 V, 3 V
2 V
2.55
mV/°C
30
30
Sample time required if
channel 10 is selected
ADC10ON = 1, INCH = 0Ah,
Error of conversion result ≤ 1 LSB
tSENSOR(sample)
µs
(2)
3 V
2 V
0.97
1.46
1.0
1.5
1.03
V
ADC10ON = 1, INCH = 0Bh,
VMID is ~0.5 × VAVCC
VMID
AVCC divider at channel 11
Sample time required if
3 V
1.54
ADC10ON = 1, INCH = 0Bh,
Error of conversion result ≤ 1 LSB
tVMID(sample)
2 V, 3 V
1000
ns
(3)
channel 11 is selected
(1) The temperature sensor offset can vary significantly. A single-point calibration is recommended to minimize the offset error of the built-in
temperature sensor.
(2) The typical equivalent impedance of the sensor is 51 kΩ. The sample time required includes the sensor-on time tSENSOR(on)
.
(3) The on-time tVMID(on) is included in the sampling time tVMID(sample); no additional on time is needed.
1050
1000
950
900
850
800
750
700
650
600
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
Ambient Temperature - Degrees Celsius
Figure 11. Typical Temperature Sensor Voltage
66
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