MSP430F643 Datasheet, PDF (65/106 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F643x
www.ti.com
SLAS720B – AUGUST 2010 – REVISED AUGUST 2012
12-Bit ADC, Linearity Parameters Using AVCC as Reference Voltage (continued)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
E_O
Offset error⁽³⁾
E_G
Gain error⁽³⁾
E_T
Total unadjusted error
TEST CONDITIONS
See ⁽²⁾
See ⁽²⁾
See ⁽²⁾
V_CC
2.2 V, 3 V
2.2 V, 3 V
2.2 V, 3 V
MIN TYP
±1
±2
±2
(3) Parameters are derived using a best fit curve.
MAX
±2
±4
±5
UNIT
LSB
LSB
LSB
12-Bit ADC, Linearity Parameters Using the Internal Reference Voltage
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS⁽¹⁾
V_CC
MIN TYP
E_I
Integral
linearity error⁽²⁾
ADC12SR = 0, REFOUT = 1
ADC12SR = 0, REFOUT = 0
f_ADC12CLK ≤ 4.0 MHz
f_ADC12CLK ≤ 2.7 MHz
2.2 V, 3 V
E_D
Differential
linearity error⁽²⁾
ADC12SR = 0, REFOUT = 1
ADC12SR = 0, REFOUT = 1
ADC12SR = 0, REFOUT = 0
f_ADC12CLK ≤ 4.0 MHz
-1
f_ADC12CLK ≤ 2.7 MHz 2.2 V, 3 V
f_ADC12CLK ≤ 2.7 MHz
-1
E_O
Offset error⁽³⁾
ADC12SR = 0, REFOUT = 1
ADC12SR = 0, REFOUT = 0
f_ADC12CLK ≤ 4.0 MHz
f_ADC12CLK ≤ 2.7 MHz
2.2 V, 3 V
±2
±2
E_G
Gain error⁽³⁾
ADC12SR = 0, REFOUT = 1
ADC12SR = 0, REFOUT = 0
f_ADC12CLK ≤ 4.0 MHz
f_ADC12CLK ≤ 2.7 MHz
2.2 V, 3 V
±1
E_T
Total unadjusted
error
ADC12SR = 0, REFOUT = 1
ADC12SR = 0, REFOUT = 0
f_ADC12CLK ≤ 4.0 MHz
f_ADC12CLK ≤ 2.7 MHz
2.2 V, 3 V
±2
MAX
±1.7
±2.5
+1.5
±1
+2.5
±4
±4
±2.5
±1% ⁽⁴⁾
±5
±1% ⁽⁴⁾
UNIT
LSB
LSB
LSB
LSB
VREF
LSB
VREF
(1) The external reference voltage is selected by: SREF2 = 0, SREF1 = 0, SREF0 = 1. dVREF = V_R+ - V_R-.
(2) Parameters are derived using the histogram method.
(3) Parameters are derived using a best fit curve.
(4) The gain error and the total unadjusted error are dominated by the accuracy of the integrated reference module absolute accuracy. In
this mode the reference voltage used by the ADC12_A is not available on a pin.
12-Bit ADC, Temperature Sensor and Built-In V_MID
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
V_SENSOR
PARAMETER
See ⁽¹⁾
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⁽²⁾⁽³⁾
ADC12ON = 1, INCH = 0Ah,
Error of conversion result ≤ 1 LSB
2.2 V
100
3V
100
V_MID
AV_CC divider at channel 11
ADC12ON = 1, INCH = 0Bh,
V_MID is approximately 0.5 × V_AVCC
2.2 V
3V
1.06 1.1
1.46 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
1.14
V
1.54
ns
(1) The temperature sensor is provided by the REF module. See the REF module parametric, I_REF+, regarding the current consumption of
the temperature sensor.
(2) The temperature sensor offset can be significant. A single-point calibration is recommended 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 MSP430F5xx and MSP430F6xx 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.
Copyright © 2010–2012, Texas Instruments Incorporated
65