Datasheet
ECCN 5E002 TSPA - Technology / Software Publicly Available
MSP430F677x
,
MSP430F676x
,
MSP430F674x
www.ti.com
SLAS768D –SEPTEMBER 2012–REVISED DECEMBER 2013
REF Built-In Reference
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
REFVSEL = {2} for 2.5 V, REFON = 1 3 V 2.47 2.51 2.55
Positive built-in reference
V
REF+
REFVSEL = {1} for 2 V, REFON = 1 3 V 1.96 1.99 2.02 V
voltage
REFVSEL = {0} for 1.5 V, REFON = 1 2.2 V, 3 V 1.48 1.5 1.52
REFVSEL = {0} for 1.5 V 2.2
AVCC minimum voltage,
AV
CC(min)
Positive built-in reference REFVSEL = {1} for 2 V 2.2 V
active
REFVSEL = {2} for 2.5 V 2.7
f
ADC10CLK
= 5.0 MHz,
REFON = 1, REFBURST = 0, 3 V 18 24 µA
REFVSEL = {2} for 2.5 V
f
ADC10CLK
= 5.0 MHz,
Operating supply current
I
REF+
REFON = 1, REFBURST = 0, 3 V 16.1 21 µA
into AVCC terminal
(1)
REFVSEL = {1} for 2 V
f
ADC10CLK
= 5.0 MHz,
REFON = 1, REFBURST = 0, 3 V 14.4 21 µA
REFVSEL = {0} for 1.5 V
Temperature coefficient of I
VREF+
= 0 A, ppm/
TC
REF+
< 18 50
built-in reference
(2)
REFVSEL = (0, 1, 2}, REFON = 1 °C
2.2 V 17 22
Operating supply current REFON = 0, INCH = 0Ah,
I
SENSOR
µA
into AVCC terminal
(3)
ADC10ON = N/A, T
A
= 30°C
3 V 17 22
2.2 V 770
ADC10ON = 1, INCH = 0Ah,
V
SENSOR
See
(4)
mV
T
A
= 30°C
3 V 770
2.2 V 1.06 1.1 1.14
ADC10ON = 1, INCH = 0Bh,
V
MID
AV
CC
divider at channel 11 V
V
MID
is approximately 0.5 × V
AVCC
3 V 1.46 1.5 1.54
Sample time required if ADC10ON = 1, INCH = 0Ah,
t
SENSOR(sample)
30 µs
channel 10 is selected
(5)
Error of conversion result ≤ 1 LSB
Sample time required if ADC10ON = 1, INCH = 0Bh,
t
VMID(sample)
1 µs
channel 11 is selected
(6)
Error of conversion result ≤ 1 LSB
AV
CC
= AV
CC (min)
- AV
CC(max)
,
Power supply rejection ratio
PSRR_DC T
A
= 25°C, 120 µV/V
(dc)
REFVSEL = (0, 1, 2}, REFON = 1
AV
CC
= AV
CC (min)
- AV
CC(max)
,
Power supply rejection ratio
PSRR_AC T
A
= 25°C, f = 1 kHz, ΔVpp = 100 mV, 6.4 mV/V
(ac)
REFVSEL = (0, 1, 2}, REFON = 1
Settling time of reference AV
CC
= AV
CC (min)
- AV
CC(max)
,
t
SETTLE
75 µs
voltage
(7)
REFVSEL = (0, 1, 2}, REFON = 0 → 1
SD24_B internal reference
V
SD24REF
SD24REFS = 1 3 V 1.151 1.1623 1.174 V
voltage
SD24_B internal reference
t
ON
SD24REFS = 0->1, C
REF
= 100 nF 3 V 200 µs
turn-on time
(1) The internal reference current is supplied via terminal AVCC. Consumption is independent of the ADC10ON control bit, unless a
conversion is active. The REFON bit enables to settle the built-in reference before starting an A/D conversion.
(2) Calculated using the box method: (MAX(-40 to 85°C) – MIN(-40 to 85°C)) / MIN(-40 to 85° C)/(85°C – (–40°C)).
(3) 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 already included in I
REF+
.
(4) 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.
(5) The typical equivalent impedance of the sensor is 51 kΩ. The sample time required includes the sensor-on time t
SENSOR(on)
.
(6) The on-time t
VMID(on)
is included in the sampling time t
VMID(sample)
; no additional on time is needed.
(7) The condition is that the error in a conversion started after t
REFON
is less than ±0.5 LSB.
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