MSP430FR5994 Datasheet, PDF (57/166 Pages) Texas Instruments – Mixed-Signal Microcontrollers

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MSP430FR5994, MSP430FR59941, MSP430FR5992, MSP430FR5964, MSP430FR5962
SLASE54 – MARCH 2016
Table 5-28 lists the temperature sensor and built-in V_1/2 characteristics.
Table 5-28. 12-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
MIN TYP MAX UNIT
V_SENSOR
TC_SENSOR
t_{SENSOR(sample)}
See ^{(1) (2)} (see Figure 5-15)
See ⁽²⁾
Sample time required if ADCTCMAP = 1
and channel MAX-1 is selected⁽³⁾
ADC12ON = 1, ADC12TCMAP = 1,
T_A = 0°C
ADC12ON = 1, ADC12TCMAP = 1
ADC12ON = 1, ADC12TCMAP = 1,
Error of conversion result ≤ 1 LSB
700
2.5
30
mV
mV/°C
µs
AVCC voltage divider for
V_1/2
ADC12BATMAP = 1 on MAX input
ADC12ON = 1, ADC12BATMAP = 1
47.5% 50% 52.5%
channel
I_{V 1/2}
Current for battery monitor during sample
time
ADC12ON = 1, ADC12BATMAP = 1
38
72 µA
Sample time required if
t_{V 1/2 (sample)}
ADC12BATMAP = 1 and channel MAX is ADC12ON = 1, ADC12BATMAP = 1
3
µs
selected ⁽⁴⁾
(1) The temperature sensor offset can be as much as ±30°C. TI recommends a single-point calibration to minimize the offset error of the
built-in temperature sensor.
(2) The device descriptor 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 kΩ. 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_V1/2(sample); no additional on time is needed.
950
900
850
800
750
700
650
600
550
500
-40
-20
0
20
40
60
80
Ambient Temperature – °C
Figure 5-15. Typical Temperature Sensor Voltage
Copyright © 2016, Texas Instruments Incorporated
Specifications
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