Telit Wireless Solutions BLUEMOD+S42/AI/ADC/LUA, Руководство пользователя, Страница: 32 / 85

S42
Hardware User Guide
1VV0301303 Rev. 11
Page 32 of 85 2021-05-06
Not Subject to NDA
Firmware ADC Functionality
CEN No ADC Support
ADC/TWI Single ended AIN, 1 Channel, 15µs sampling rate
ADC/LUA Single ended AIN, 1 Channel, 3µs sampling rate
CUSTOM
Full set of nRF52832 features, depending on pin mapping nRF52 to module
pins. Please contact Telit for pin mapping information. For contact data see 1.3
Contact Information, Support
1x8 Channel ADC
1 Analog Comparator or 1 Low-Power Analog Comparator
Table 8: ADC Functionality versus Firmware
The ADC supports:
•
8/10/12-bit resolution, 14-bit resolution with oversampling
•
full swing operation 0V to VSUP
•
and up to 200kHz sample rate
•
Limit event monitoring
•
2 sources for ADC reference voltage 600mV REF or VSUP/4
• Prescaler [1/6, 1/5, 1/4, 1/3, 1/2, 1, 2, 4]
Figure 16: ADC Signal Input Structure
The ADC signal conversion is splitted into 2 phases, sample and convert. In the sampling
phase the capacitor C
SAMPLE
is charges to the analog source voltage for t
ACQ
, by closing
the TACQ switch for the acquisition time. In the conversion phase the TACQ is opened
again and the voltage on C
SAMPLE
is converted to a digital value. Therefore,