參數(shù)資料
型號(hào)： ADUC834
廠商： Analog Devices, Inc.
英文描述： MicroConverter, Dual 16-/24- Bit ADCs with Embedded 62KB FLASH MCU
中文描述： MicroConverter的，雙與嵌入62KB閃存MCU 16-/24-位ADC
文件頁(yè)數(shù)： 27/72頁(yè)
文件大?。?/td> 1451K
代理商： ADUC834
REV.
P
rC (12 March 2002)
ADuC834
–
27
–
PRELIMINARY TECHNICAL DATA
ADC0CON (Primary ADC Control Register) and ADC1CON (Auxiliary ADC Control Register)
T he ADC0CON and ADC1CON SFRs are used to configure the Primary and auxiliary ADC for reference and channel selection,
unipolar or bipolar coding and in the case of the primary ADC for range (the aux ADC operates on a fixed input range of ±V
REF
.),
ADC0CON
Primary ADC Control SFR
SFR Address
D2H
Power-On Default Value 07H
Bit Addressable
No
ADC1CON
SFR Address
Power-On Default Value
Bit Addressable
Auxiliary ADC Control SFR
D3H
00H
No
T able VI. ADC0CON SFR Bit Designations
Bit
Name
Description
7
6
---
X REF0
Reserved for Future Use.
Primary ADC External Reference Select Bit.
Set
by user to enable the Primary ADC to use the external reference via REFIN(+)/REFIN(–).
Cleared
by user to enable the Primary ADC to use the internal bandgap reference (V
REF
= 1.25 V).
Primary ADC Channel Selection Bits.
Written by the user to select the differential input pairs used by the Primary ADC as follows:
CH1
CH0
Positive InputNegative Input
0
0
AIN1
AIN2
0
1
AIN3
AIN4
1
0
AIN2
AIN2 (Internal Short)
1
1
AIN3
AIN2
Primary ADC Unipolar Bit.
Set
by user to enable unipolar coding, i.e., zero differential input will result in 000000 hex output.
Cleared
by user to enable bipolar coding, zero differential input will result in 800000 hex output.
Primary ADC Range Bits.
Written by the user to select the Primary ADC input range as follows:
RN2
RN1
RN0
Selected Primary ADC Input Range (V
REF
= 2.5 V)
0
0
0
±20 mV
(0-20mV in unipolar mode)
0
0
1
±40 mV
(0-40mV in unipolar mode)
0
1
0
±80 mV
(0-80mV in unipolar mode)
0
1
1
±160 mV
(0-160mV in unipolar mode)
1
0
0
±320 mV
(0-320mV in unipolar mode)
1
0
1
±640 mV
(0-640mV in unipolar mode)
1
1
0
±1.28 V
(0-1.28V in unipolar mode)
1
1
1
±2.56 V
(0-2.56V in unipolar mode)
5
4
CH1
CH0
3
UNI0
2
1
0
RN2
RN1
RN0
T able VII. ADC1CON SFR Bit Designations
Bit
Name
Description
7
6
---
X REF1
Reserved for Future Use.
Auxiliary ADC External Reference Bit.
Set
by user to enable the Auxiliary ADC to use the external reference via REFIN(+)/REFIN(–).
Cleared
by user to enable the Auxiliary ADC to use the internal bandgap reference.
Auxiliary ADC Channel Selection Bits.
Written by the user to select the single-ended input pins used to drive the Auxiliary ADC as follows:
ACH1
ACH0
Positive Input
Negative Input
0
0
AIN3
AGND
0
1
AIN4
AGND
1
0
T emp Sensor
*
AGND (T emp. Sensor routed to the ADC input)
1
1
AIN5
AGND
Auxiliary ADC Unipolar Bit.
Set
by user to enable unipolar coding, i.e., zero input will result in 0000 hex output.
Cleared
by user to enable bipolar coding, zero input will result in 8000 hex output.
Reserved for Future Use.
Reserved for Future Use.
Reserved for Future Use.
5
4
ACH1
ACH0
3
UNI1
2
1
0
---
---
---
*
NOT ES
1. When the temperature sensor is selected, user code must select internal reference via X REF1 bit above and clear the UNI1 bit (ADC1CON.3) to select bipolar coding.
2. T he temperature sensor is factory calibrated to yield conversion results 8000H at 0°C.
3. A +1°C change in temperature will result in a +1 LSB change in the ADC1H register ADC conversion result.
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