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參數資料
| 型號： | ADUC814BRU-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Circular Connector; No. of Contacts:56; Series:LJT07R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:25; Circular Contact Gender:Pin; Circular Shell Style:Jam Nut Receptacle; Insert Arrangement:25-4 |
| 中文描述： | 8-BIT, FLASH, 16.78 MHz, MICROCONTROLLER, PDSO28 |
| 封裝： | 4.40 X 9.70 MM, MO-153AE, TSSOP-28 |
| 文件頁數： | 29/72頁 |
| 文件大?。?/td> | 846K |
| 代理商： | ADUC814BRU-REEL |
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ADuC814
gain coefficient compensates for a larger analog input signal
range and scales down the ADC transfer function, effectively
decreasing the slope of the transfer function. The maximum
analog input signal range for which the gain coefficient can
compensate is 1.035 × V
REF
, and the minimum input range is
0.965 × V
REF
, which equates to typically ±3.5% of the reference
voltage.
Rev. A | Page 29 of 72
CALIBRATING THE ADC
The ADuC814 has two hardware calibration modes, device
calibration and system calibration, that can be easily initiated by
the user software. The ADCCON3 SFR is used to calibrate the
ADC. See Table 8.
Device calibration is so called because the relevant signals used
for the calibration are available internally to the ADC. This
calibration method can be used to compensate for significant
changes in operating conditions, such as core frequency, analog
input range, reference voltage and supply voltages. In this
calibration mode, offset calibration uses internal AGND
selected via the ADCCON2 register bits CS3–CS0 (1011), and
gain calibration uses internal V
REF
selected by CS3–CS0 (1100).
Offset calibration should be executed first, followed by gain
calibration.
System calibration is so called because the AGND and V
REF
required for calibration must be the system AGND and V
REF
signals. These must be supplied in turn, externally, to the ADC
inputs. This calibration method can be used to compensate for
both internal and external system errors. To perform system
calibration using an external reference, tie system ground and
reference to any two of the six selectable inputs. Enable external
reference mode (ADCCON1.6). Select the channel connected to
AGND via CS3–CS0 and perform system offset calibration.
Select the channel connected to V
REF
via CS3–CS0 and perform
system gain calibration.
INITIATING CALIBRATION IN CODE
When calibrating the ADC, ADCCON1 should be set to the
configuration in which the ADC is used. The ADCCON3
register can then be used to configure and execute the offset
and gain calibration required in sequence.
Configure the ADC as required. In this case, ADCCLK = /4,
acquisition time is set to 1 clock (T
ACQ
), and ADC is enabled.
MOV ADCCON1,#0D0H
;ADC on, ADCCLK set to
;divide by 4, 1 acquisition
;clock (Tacq)
To perform device offset calibration:
MOV ADCCON2,#0BH
MOV ADCCON3,#25H
;select internal AGND
;select offset calibration,
;31 averages per bit,
;offset calibration
To perform device gain calibration:
MOV ADCCON2,#0CH
ADCCON3,#27H
;select internal V
REF
MOV
;select offset calibration,
;31 averages per bit,
;offset calibration
To perform system offset calibration:
Connect system AGND to an ADC input (Channel 0 in this case).
MOV ADCCON2,#00H
MOV ADCCON3,#25H
;select external AGND
;select offset calibration,
;31 averages per bit
To perform system gain calibration:
Connect system V
REF
to an ADC input (Channel 1 in this case).
MOV ADCCON2,#01H
ADCCON3,#27H
;select external V
REF
MOV
;select offset calibration,
;31 averages / bit (NUMAV),
;offset calibration
The calibration cycle time
T
CAL
is calculated by
T
CAL
= 14 ×
ADCCLK
×
NUMAV
× (16 +
T
ACQ
)
For an ADCCLK/F
CORE
, divide ratio of 4, a
T
ACQ
= 1 ADCCLK,
NUMAV = 31, the calibration cycle time is
T
CAL
= 14 × (1 / 4194304) × 31 × (16 + 1)
T
CAL
= 1.76
mS
In a calibration cycle, the ADC busy flag (Bit 7), instead of
framing an individual ADC conversion as in normal mode, goes
high at the start of calibration and returns to zero only at the
end of the calibration cycle. It can therefore be monitored in
code to indicate when the calibration cycle is completed. The
following code can be used to monitor the BUSY signal during
a calibration cycle.
WAIT:
MOV A, ADCCON3
JB ACC.7, WAIT
;move ADCCON3 to A
;If bit 7 is set jump to
WAIT
;else continue
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| ADUC814BRU-REEL7 | Circular Connector; No. of Contacts:61; Series:LJT07R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:25; Circular Contact Gender:Pin; Circular Shell Style:Jam Nut Receptacle; Insert Arrangement:25-61 |
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