Datasheet

MSP430G22x0
SLAS753E –JANUARY 2012–REVISED FEBRUARY 2013 www.ti.com
10-Bit ADC, Temperature Sensor and Built-In V
MID
(MSP430G2230 Only)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
Temperature sensor supply REFON = 0, INCHx = 0Ah,
I
SENSOR
3 V 60 µA
current
(1)
T
A
= 25°C
TC
SENSOR
ADC10ON = 1, INCHx = 0Ah
(2)
3 V 3.55 mV/°C
Sample time required if channel ADC10ON = 1, INCHx = 0Ah,
t
Sensor(sample)
3 V 30 µs
10 is selected
(3)
Error of conversion result ≤ 1 LSB
I
VMID
Current into divider at channel 11 ADC10ON = 1, INCHx = 0Bh 3 V
(4)
µA
ADC10ON = 1, INCHx = 0Bh,
V
MID
V
CC
divider at channel 11 3 V 1.5 V
V
MID
≈ 0.5 × V
CC
Sample time required if channel ADC10ON = 1, INCHx = 0Bh,
t
VMID(sample)
3 V 1220 ns
11 is selected
(5)
Error of conversion result ≤ 1 LSB
(1) The sensor current I
SENSOR
is consumed if (ADC10ON = 1 and REFON = 1) or (ADC10ON = 1 and INCH = 0Ah and sample signal is
high). When REFON = 1, I
SENSOR
is included in I
REF+
. When REFON = 0, I
SENSOR
applies during conversion of the temperature sensor
input (INCH = 0Ah).
(2) The following formula can be used to calculate the temperature sensor output voltage:
V
Sensor,typ
= TC
Sensor
(273 + T [°C] ) + V
Offset,sensor
[mV] or
V
Sensor,typ
= TC
Sensor
T [°C] + V
Sensor
(T
A
= 0°C) [mV]
(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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