MSP430F551X_1 Datasheet, PDF (71/115 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F551x
MSP430F552x
www.ti.com
SLAS590D – OCTOBER 2009 – REVISED APRIL 2010
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)
V_SENSOR
PARAMETER
See ⁽²⁾
TEST CONDITIONS
ADC12ON = 1, INCH = 0Ah,
T_A = 0°C
V_CC
2.2 V
3V
MIN TYP
680
680
TC_SENSOR
2.2 V
2.25
ADC12ON = 1, INCH = 0Ah
3V
2.25
t_{SENSOR(sample)}
Sample time required if
channel 10 is selected⁽³⁾
ADC12ON = 1, INCH = 0Ah,
2.2 V
30
Error of conversion result ≤ 1 LSB
3V
30
V_MID
AV_CC divider at channel 11,
V_AVCC factor
AV_CC divider at channel 11
ADC12ON = 1, INCH = 0Bh
ADC12ON = 1, INCH = 0Bh
2.2 V
3V
0.48 0.5
1.06 1.1
1.44 1.5
t_VMID(sample)
Sample time required if
channel 11 is selected⁽⁴⁾
ADC12ON = 1, INCH = 0Bh,
Error of conversion result ≤ 1 LSB
2.2 V/3 V 1000
MAX UNIT
mV
mV/°C
µs
0.52 V_AVCC
1.14
V
1.56
ns
(1) The temperature sensor is provided by the REF module. Please refer to 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 in order 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 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.
1000
950
900
850
800
750
700
650
600
550
500
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
Ambient Temperature - ˚C
Figure 16. Typical Temperature Sensor Voltage
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