Preliminary
SN8P1702A/SN8P1703A
8-bit micro-controller build-in 12-bit ADC
114-CHANNEL ANALOG TO DIGITAL
CONVERTER
OVERVIEW
This analog to digital converter of SN8P1702A/SN8P1703A has 4-input sources with up to 4096-step resolution to
transfer analog signal into 12-bits digital data. The sequence of ADC operation is to select input source (AIN0 ~ AIN3)
at first, then set GCHS and ADS bit to “1” to start conversion. When the conversion is complete, the ADC circuit will set
EOC bit to “1” and final value output in ADB register. This ADC circuit can select between 8-bit and 12-bit resolution
operation by programming ADLEN bit in ADR register.
AIN0/P4.0
AIN1/P4.1
A/D
AIN2/P4.2
CONVERTER
(ADC)
8/12
AIN3/P4.3
Figure 11-1. AD Converter Function Diagram
ꢀ
Note: For 8-bit resolution, the conversion time is 12 steps.
For 12-bit resolution, the conversion time is 16 steps.
ꢀ
ꢀ
Note: The analog input level must be between the AVREFH and VSS.
Note: The AVREFH level must be between the VDD and VSS+1.2V.
SONiX TECHNOLOGY CO., LTD
Page 94
Revision 0.5
SONIX [ SONIX TECHNOLOGY COMPANY ]
