ECCN 5E002 TSPA - Technology / Software Publicly Available
CC430F6137, CC430F6135, CC430F6127, CC430F6126, CC430F6125
CC430F5137, CC430F5135, CC430F5133
SLAS554H – MAY 2009 – REVISED SEPTEMBER 2013
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REF, Built-In Reference
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
(1)
PARAMETER
TEST CONDITIONS
V
CC
MIN
TYP
MAX
UNIT
REFVSEL = 2 for 2.5 V,
REFON = REFOUT = 1,
3 V
2.41
±1.5%
I
VREF+
= 0 A
REFVSEL = 1 for 2.0 V,
Positive built-in reference
V
REF+
REFON = REFOUT = 1,
3 V
1.93
±1.5%
V
voltage output
I
VREF+
= 0 A
REFVSEL = 0 for 1.5 V,
REFON = REFOUT = 1,
2.2 V, 3 V
1.45
±1.5%
I
VREF+
= 0 A
REFVSEL = 0 for 1.5 V, reduced performance
1.8
AVCC minimum voltage,
REFVSEL = 0 for 1.5 V
2.2
AV
CC(min)
Positive built-in reference
V
REFVSEL = 1 for 2.0 V
2.3
active
REFVSEL = 2 for 2.5 V
2.8
REFON = 1, REFOUT = 0, REFBURST = 0
3 V
100
140
µA
Operating supply current into
I
REF+
AVCC terminal
(2) (3)
REFON = 1, REFOUT = 1, REFBURST = 0
3 V
0.9
1.5
mA
REFVSEL = 0, 1, or 2,
Load-current regulation,
I
VREF+
= +10 µA or –1000 µA,
I
L(VREF+)
2500 µV/mA
VREF+ terminal
(4)
AV
CC
= AV
CC (min)
for each reference level,
REFON = REFOUT = 1
Capacitance at VREF+
C
VREF+
REFON = REFOUT = 1
20
100
pF
terminals, internal reference
I
VREF+
= 0 A,
Temperature coefficient of
ppm/
TC
REF+
REFVSEL = 0, 1, or 2,
30
50
built-in reference
(5)
°C
REFON = 1, REFOUT = 0 or 1
AV
CC
= AV
CC (min)
- AV
CC(max)
,
Power supply rejection ratio
PSRR_DC
T
A
= 25 °C, REFVSEL = 0, 1, or 2,
120
300
µV/V
(dc)
REFON = 1, REFOUT = 0 or 1
AV
CC
= AV
CC (min)
- AV
CC(max)
Power supply rejection ratio
T
A
= 25 °C, f = 1 kHz,
Δ
Vpp = 100 mV,
PSRR_AC
6.4
mV/V
(ac)
REFVSEL = 0, 1, or 2,
REFON = 1, REFOUT = 0 or 1
AV
CC
= AV
CC (min)
- AV
CC(max)
,
REFVSEL = 0, 1, or 2,
75
REFOUT = 0, REFON = 0
→
1
Settling time of reference
t
SETTLE
µs
AV
CC
= AV
CC (min)
- AV
CC(max)
,
voltage
(6)
C
VREF
= C
VREF
(max),
75
REFVSEL = 0, 1, or 2,
REFOUT = 1, REFON = 0
→
1
(1)
The reference is supplied to the ADC by the REF module and is buffered locally inside the ADC. The ADC uses two internal buffers, one
smaller and one larger for driving the VREF+ terminal. When REFOUT = 1, the reference is available at the VREF+ terminal, as well as,
used as the reference for the conversion and utilizes the larger buffer. When REFOUT = 0, the reference is only used as the reference
for the conversion and utilizes the smaller buffer.
(2)
The internal reference current is supplied from the AVCC terminal. Consumption is independent of the ADC12ON control bit, unless a
conversion is active. The REFON bit enables to settle the built-in reference before starting an A/D conversion. REFOUT = 0 represents
the current contribution of the smaller buffer. REFOUT = 1 represents the current contribution of the larger buffer without external load.
(3)
The temperature sensor is provided by the REF module. Its current is supplied from the AVCC terminal and is equivalent to I
REF+
with
REFON =1 and REFOUT = 0.
(4)
Contribution only due to the reference and buffer including package. This does not include resistance due to PCB trace or other causes.
(5)
Calculated using the box method: (MAX(-40 to 85°C) – MIN(-40 to 85°C)) / MIN(-40 to 85°C)/(85°C – (–40°C)).
(6)
The condition is that the error in a conversion started after t
REFON
is less than ±0.5 LSB. The settling time depends on the external
capacitive load when REFOUT = 1.
68
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