AN3116

Independent modes

Doc ID 16840 Rev 1

5/18

1

Independent modes

1.1

Single-channel, single conversion mode

1.1.1

Description

This is the simplest ADC mode. In this mode, the ADC performs the single conversion

(single sample) of a single channel x (refer to Figure 1.) and stops after completion of the

conversion.

Note:

This application note is not delivered with a firmware example of this mode.

Figure 1.

Single-channel, single conversion mode

1.1.2

Example of application

This mode can be used for the measurement of a voltage level to decide if the system can

be started or not. Measure the voltage level of the battery before starting the system: if the

battery has a low level, the “low battery” message appears. In this case, do not start the

system.

1.2

Multichannel (scan), single conversion mode

1.2.1

Description

This mode is used to convert some channels successively in independent mode. With the

ADC sequencer, you can use this ADC mode to configure any sequence of up to 16

channels successively with different sampling times and in different orders. You can for

example carry out the sequence shown in Figure 2. In this way, you do not have to stop the

ADC during the conversion process in order to reconfigure the next channel with a different

sampling time. This mode saves additional CPU load and heavy software development.

Figure 2.

ADC sequencer converting 7 channels with different configured sampling

times

Note:

This application note is not delivered with a firmware example of this mode.