ADUC836 Analog Devices, ADUC836 Datasheet - Page 19

• Manufacturer Part Number: ADUC836
• Description: Precision Analog Microcontroller: 1MIPS 8052 MCU + 62kB Flash + Dual 16-Bit ADC + 12-Bit DAC
• Manufacturer: Analog Devices

Specifications of ADUC836

• Mcu Core: 8052
• Mcu Speed (mips): 1
• Sram (bytes): 2304Bytes
• Gpio Pins: 34
• Adc # Channels: 4
• Other: PWM

ADC0CON (Primary ADC Control Register) and ADC1CON (Auxiliary ADC Control Register)
The 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, range (the auxiliary ADC operates on a fixed input range of ±V
ADC0CON
SFR Address
Power-On Default Value
Bit Addressable
Bit
7
6
5
4
3
2
1
0
Bit
7
6
5
4
3
2
1
0
NOTES
1. When the temperature sensor is selected, user code must select internal reference via XREF1 bit above and clear the UNI1 bit (ADC1CON.3) to select bipolar coding.
2. The 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.
REV. A
ACH1
ACH0
Name
–––
XREF0
CH1
CH0
UNI0
RN2
RN1
RN0
Name
–––
XREF1
UNI1
–––
–––
–––
Written by the user to select the differential input pairs used by the primary ADC as follows:
Written by the user to select the primary ADC input range as follows:
Description
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 band gap reference (V
Primary ADC Channel Selection Bits.
CH1
0
0
1
1
Primary ADC Unipolar Bit.
Set by user to enable unipolar coding, i.e., zero differential input will result in 000000H output.
Cleared by user to enable bipolar coding, i.e., zero differential input will result in 800000H output.
Primary ADC Range Bits.
RN2
0
0
0
0
1
1
1
1
Description
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 band gap 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
0
0
1
1
Auxiliary ADC Unipolar Bit.
Set by user to enable unipolar coding, i.e., zero input will result in 0000H output.
Cleared by user to enable bipolar coding, i.e., zero input will result in 8000H output.
Reserved for Future Use
Reserved for Future Use
Reserved for Future Use
Primary ADC Control SFR
D2H
07H
No
CH0
0
1
0
1
RN1
0
0
1
1
0
0
1
1
ACH0
0
1
0
1
Temp Sensor
Positive Input
AIN1
AIN3
AIN2
AIN3
RN0
0
1
0
1
0
1
0
1
Positive Input
AIN3
AIN4
AIN5
Table VII. ADC1CON SFR Bit Designations
Table VI. ADC0CON SFR Bit Designations
Selected Primary ADC Input Range (V
±20 mV
±40 mV
±80 mV
±160 mV
±320 mV
±640 mV
±1.28 V
±2.56 V
AIN2
AIN4
AIN2 (Internal Short)
AIN2
AGND
AGND
AGND
Negative Input
Negative Input
AGND (Temp Sensor routed to the ADC input)
–19–
ADC1CON
SFR Address
Power-On Default Value
Bit Addressable
(0 mV–20 mV in Unipolar Mode)
(0 mV–40 mV in Unipolar Mode)
(0 mV–80 mV in Unipolar Mode)
(0 mV–160 mV in Unipolar Mode)
(0 mV–320 mV in Unipolar Mode)
(0 mV–640 mV in Unipolar Mode)
(0 V–1.28 V in Unipolar Mode)
(0 V–2.56 V in Unipolar Mode)
REF
= 2.5 V)
Auxiliary ADC Control SFR
D3H
00H
No
REF
= 1.25 V).
ADuC836
REF
).