CC430F6137_14 Datasheet, PDF (68/120 Pages) Texas Instruments – MSP430™ SoC With RF Core

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
V_REF+
Positive built-in reference
voltage output
AV_CC(min)
AVCC minimum voltage,
Positive built-in reference
active
TEST CONDITIONS
REFVSEL = 2 for 2.5 V,
REFON = REFOUT = 1,
I_VREF+= 0 A
REFVSEL = 1 for 2.0 V,
REFON = REFOUT = 1,
I_VREF+= 0 A
REFVSEL = 0 for 1.5 V,
REFON = REFOUT = 1,
I_VREF+= 0 A
REFVSEL = 0 for 1.5 V, reduced performance
REFVSEL = 0 for 1.5 V
REFVSEL = 1 for 2.0 V
REFVSEL = 2 for 2.5 V
V_CC
3V
3V
2.2 V, 3 V
MIN TYP MAX UNIT
2.41 ±1.5%
1.93 ±1.5% V
1.45 ±1.5%
1.8
2.2
V
2.3
2.8
I_REF+
Operating supply current into ^{REFON = 1, REFOUT = 0, REFBURST = 0}
AVCC terminal⁽²⁾⁽³⁾
REFON = 1, REFOUT = 1, REFBURST = 0
3V
3V
100 140 µA
0.9 1.5 mA
I_L(VREF+)
Load-current regulation,
VREF+ terminal⁽⁴⁾
REFVSEL = 0, 1, or 2,
I_VREF+ = +10 µA or –1000 µA,
AV_CC = AV_{CC (min)} for each reference level,
REFON = REFOUT = 1
2500 µV/mA
C_VREF+
Capacitance at VREF+
terminals, internal reference
REFON = REFOUT = 1
20
100 pF
TC_REF+
Temperature coefficient of
built-in reference⁽⁵⁾
I_VREF+ = 0 A,
REFVSEL = 0, 1, or 2,
REFON = 1, REFOUT = 0 or 1
30
50
ppm/
°C
PSRR_DC
Power supply rejection ratio
(dc)
AV_CC = AV_{CC (min)} - AV_CC(max),
T_A = 25 °C, REFVSEL = 0, 1, or 2,
REFON = 1, REFOUT = 0 or 1
120 300 µV/V
PSRR_AC
Power supply rejection ratio
(ac)
AV_CC = AV_{CC (min)} - AV_CC(max)
T_A = 25 °C, f = 1 kHz, ΔVpp = 100 mV,
REFVSEL = 0, 1, or 2,
REFON = 1, REFOUT = 0 or 1
6.4
mV/V
t_SETTLE
Settling time of reference
voltage ⁽⁶⁾
AV_CC = AV_{CC (min)} - AV_CC(max),
REFVSEL = 0, 1, or 2,
REFOUT = 0, REFON = 0 → 1
AV_CC = AV_{CC (min)} - AV_CC(max),
C_VREF = C_VREF(max),
REFVSEL = 0, 1, or 2,
REFOUT = 1, REFON = 0 → 1
75
µs
75
(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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