ST STM32F10 Series User Manual

UM0306 Analog/digital converter (ADC)
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19.3 Pin description
19.4 Functional description
19.4.1 ADC on-off control
The ADC can be powered-on by setting the ADON bit in the ADC_CR1 register. When the
ADON bit is set for the first time, it wakes up the ADC from Power Down mode.
Conversion starts when ADON bit is set for a second time by software after ADC power-up
time (t
STAB
).
You can stop conversion and put the ADC in power down mode by resetting the ADON bit. In
this mode the ADC consumes almost no power (only a few µA).
19.4.2 ADC clock
The ADCCLK clock provided by the Clock Controller is synchronous with the PCLK2 (APB2
clock). The CLK controller provides has a dedicated programmable prescaler for the ADC
clock, refer to the CLK chapter for more details.
19.4.3 Channel selection
There are 16 multiplexed channels. It is possible to organize the conversions in two groups:
regular and injected. A group consists of a sequence of conversions which can be done on
any channel and in any order. For instance, it is possible to do the conversion in the
following order: Ch3, Ch8, Ch2, Ch2, Ch0, Ch2, Ch2, Ch15.
● The regular group is composed of up to 16 conversions. The regular channels and
their order in the conversion sequence must be selected in the ADC_SQRx registers.
The total number of conversions in the regular group must be written in the L[3:0] bits in
the ADC_SQR1 register.
● The injected group is composed of up to 4 conversions. The injected channels and
their order in the conversion sequence must be selected in the ADC_JSQR register.
Table 65. ADC pins
Name Signal type Remarks
V
REF+
Input, Analog
Reference positive
The higher/positive reference voltage for the ADC,
V
SSA
≤ V
REF+
≤ V
DDA
V
DDA
Input, Analog
supply
Analog power supply equal to V
DD
and
2.4V ≤ V
DDA
≤ V
DD
(3.6V)
V
REF-
Input, Analog
Reference negative
The lower/negative reference voltage for the ADC,
V
REF-
= V
SSA
V
SSA
Input, Analog
supply ground
Ground for analog power supply equal to V
SS
ADC_IN[15:0]
Analog input
signals
16 analog input channels
EXTSEL[2:0] input, digital Six external triggers for starting regular group conversion
JEXTSEL[2:0] input, digital Six external triggers for starting injected group conversion
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ST STM32F10 Series Specifications

General

Brand	ST
Model	STM32F10 Series
Category	Microcontrollers
Language	English