RM0008 Analog-to-digital converter (ADC)
Doc ID 13902 Rev 12 205/1096
11 Analog-to-digital converter (ADC)
Low-density devices are STM32F101xx, STM32F102xx and STM32F103xx
microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes.
Medium-density devices are STM32F101xx, STM32F102xx and STM32F103xx
microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes.
High-density devices are STM32F101xx and STM32F103xx microcontrollers where the
Flash memory density ranges between 256 and 512 Kbytes.
XL-density devices are STM32F101xx and STM32F103xx microcontrollers where the
Flash memory density ranges between 768 Kbytes and 1 Mbyte.
Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers.
This Section applies to the whole STM32F10xxx family, unless otherwise specified.
11.1 ADC introduction
The 12-bit ADC is a successive approximation analog-to-digital converter. It has up to 18
multiplexed channels allowing it measure signals from 16 external and two internal sources.
A/D conversion of the various channels can be performed in single, continuous, scan or
discontinuous mode. The result of the ADC is stored in a left-aligned or right-aligned 16-bit
data register.
The analog watchdog feature allows the application to detect if the input voltage goes
outside the user-defined high or low thresholds.
The ADC input clock is generated from the PCLK2 clock divided by a prescaler and it must
not exceed 14 MHz, refer to Figure 8: Clock tree for low-, medium-, high- and XL-density
devices, and to Figure 11: Clock tree for connectivity line devices.
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