SN32F760 Series
32-Bit Cortex-M0 Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 90
Version 2.0
7
7
7
14+1 CHANNEL ANALOG TO DIGITAL
CONVERTOR (ADC)
7.1 OVERVIEW
This analog to digital converter has 14 external channels and 1 internal channel to Temperature sensor, 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 ~ AIN13
) 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.
Use CHS[3:0] to select AIN pin and GCHS enables global ADC channel, the analog signal inputs to ADC engine.
The ADC reference high voltage includes two source, one is internal Vdd (AVREFHSEL=0), and the other one is
external reference voltage input pin from P2.0 pin (AVREFHSEL=1).
The ADC resolution can be selected 8-bit or 12-bit through ADLEN bit in ADR register. The ADC converting rate can be
selected by ADCKS[1:0] bits. The two parameters decide ADC converting time.
SAR ADC
ENGINE
CHS[3:0]
GCHS
ADC High
Reference Voltage
Analog
Input
ADENB
ADS
ADC Clock
Counter
ADCKS[1:0]
ADLEN
ADB[11:0]
EOC
ADCIRQ
8/12
ADTS[1:0]
Vss
Vdd
ADT[4:0]
ADC Offset
Calibration
P2CON
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
AIN8
AIN9
AIN10
AIN11
AIN12
AIN13
AIN0/AVREFH
AIN1
Internal Vdd
AVREFHSEL
AIN14 (Internal to TS)
Note:
1. For 8-bit resolution the conversion time is 12 steps. For 12-bit resolution the conversion time is 16
steps
Содержание SN32F755
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