參數(shù)資料
型號(hào)： MSP430F5517IPNR
廠商： TEXAS INSTRUMENTS INC
元件分類： 微控制器/微處理器
英文描述： 16-BIT, FLASH, RISC MICROCONTROLLER, PQFP80
封裝： GREEN, PLASTIC, LQFP-80
文件頁(yè)數(shù)： 89/119頁(yè)
文件大?。?/td> 1351K
代理商： MSP430F5517IPNR
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MSP430F551x
MSP430F552x
SLAS590E
– MARCH 2009 – REVISED APRIL 2011
REF, External Reference
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
(1)
PARAMETER
TEST CONDITIONS
VCC
MIN
TYP
MAX
UNIT
Positive external reference
VeREF+
VeREF+ > VREF–/VeREF–
(2)
1.4
AVCC
V
voltage input
Negative external reference
VREF–/VeREF–
VeREF+ > VREF–/VeREF–
(3)
0
1.2
V
voltage input
(VeREF+ –
Differential external reference
VeREF+ > VREF–/VeREF–
(4)
1.4
AVCC
V
VREF–/VeREF–)
voltage input
1.4 V
≤ VeREF+ ≤
VAVCC
, VeREF– = 0
V, fADC12CLK = 5 MHz,
2.2 V/3 V
-26
26
A
ADC12SHTx = 1h,
Conversion rate 200ksps
IVeREF+,
Static input current
IVREF–/VeREF–
1.4 V
≤ VeREF+ ≤
VAVCC
, VeREF– = 0
V, fADC12CLK = 5 MHz,
2.2 V/3 V
-1
1
A
ADC12SHTx = 8h,
Conversion rate 20ksps
CVREF+/-
Capacitance at VREF+/- terminal
(5)10
F
(1)
The external reference is used during ADC conversion to charge and discharge the capacitance array. The input capacitance, Ci, is also
the dynamic load for an external reference during conversion. The dynamic impedance of the reference supply should follow the
recommendations on analog-source impedance to allow the charge to settle for 12-bit accuracy.
(2)
The accuracy limits the minimum positive external reference voltage. Lower reference voltage levels may be applied with reduced
accuracy requirements.
(3)
The accuracy limits the maximum negative external reference voltage. Higher reference voltage levels may be applied with reduced
accuracy requirements.
(4)
The accuracy limits minimum external differential reference voltage. Lower differential reference voltage levels may be applied with
reduced accuracy requirements.
(5)
Two decoupling capacitors, 10
F and 100nF, should be connected to VREF to decouple the dynamic current required for an external
reference source if it is used for the ADC12_A. See also the MSP430x5xx Family User
's Guide (SLAU208).
REF, Built-In Reference
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
(1)
PARAMETER
TEST CONDITIONS
VCC
MIN
TYP
MAX
UNIT
REFVSEL = {2} for 2.5 V
REFON = REFOUT = 1
3 V
2.4625
2.50 2.5375
IVREF+= 0 A
REFVSEL = {1} for 2.0 V
Positive built-in reference
VREF+
REFON = REFOUT = 1
3 V
1.9503
1.98 2.0097
V
voltage output
IVREF+= 0 A
REFVSEL = {0} for 1.5 V
REFON = REFOUT = 1
2.2 V/ 3 V
1.4677
1.49 1.5124
IVREF+= 0 A
REFVSEL = {0} for 1.5 V
2.2
AVCC minimum voltage,
AVCC(min)
Positive built-in reference
REFVSEL = {1} for 2.0 V
2.3
V
active
REFVSEL = {2} for 2.5 V
2.8
REFON = 1, REFOUT = 0, REFBURST = 0
3 V
100
140
A
Operating supply current into
IREF+
AVCC terminal
(2) (3)
REFON = 1, REFOUT = 1, REFBURST = 0
3 V
0.9
1.5
mA
(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 via terminal AVCC. Consumption is independent of the ADC12ON control bit, unless a
conversion is active. 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 via terminal AVCC and is equivalent to IREF+ with REFON
=1 and REFOUT = 0.
Copyright
2009–2011, Texas Instruments Incorporated
71
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