MSP430F249-EP_014 Datasheet, PDF (60/81 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F249-EP
MIXED SIGNAL MICROCONTROLLER
2008
electrical characteristics over recommended operating free-air temperature (unless otherwise
noted) (continued)
12-bit ADC, temperature sensor and built-in V_MID
PARAMETER
TEST CONDITIONS
VCC MIN TYP
MAX UNIT
I_SENSOR
Operating supply current into
AV_CC terminal (see Note 1)
REFON = 0, INCH = 0Ah,
ADC12ON = 1, T_A = 25_C
2.2 V
3V
40
120
μA
60
160
V_SENSOR†
See Note 2
ADC12ON = 1, INCH = 0Ah,
2.2 V
986
T_A = 0°C
mV
3V
986
TC_SENSOR†
ADC12ON = 1, INCH = 0Ah
2.2 V
3V
3.55 3.55 ± 3%
3.55 3.55 ± 3% ^mV/°C
t_{SENSOR(sample)â€} 
Sample time required if channel
10 is selected (see Note 3)
ADC12ON = 1, INCH = 0Ah,
Error of conversion result ≤ 1 LSB
2.2 V
3V
30
30
μs
I_VMID
Current into divider at channel 11
(see Note 4)
ADC12ON = 1, INCH = 0Bh,
2.2 V
3V
NA
μA
NA
V_MID
AV_CC divider at channel 11
ADC12ON = 1, INCH = 0Bh,
V_MID is ~0.5 × V_AVCC
2.2 V
3V
1.1 1.1 ± 0.04
1.5 1.5 ± 0.04
V
t_VMID(sample)
Sample time required if channel
11 is selected (see Note 5)
ADC12ON = 1, INCH = 0Bh,
Error of conversion result ≤ 1 LSB
2.2 V
3V
1400
1220
ns
† _{Limits characterized}
NOTES: 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 as much as ±20_C. A single-point calibration is recommended in order 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. No additional current is needed. The V_MID is used during sampling.
5. The on-time t_VMID(on) is included in the sampling time t_VMID(sample); no additional on time is needed.
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