STM8S datasheet(431/467 Pages) STMICROELECTRONICS

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DocID14587 Rev 14

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RM0016

Analog/digital converter (ADC)

454

24.4

ADC pins

24.5

ADC functional description

24.5.1

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. To start

conversion, set the ADON bit in the ADC_CR1 register with a second write instruction.

At the end of conversion, the ADC remains powered on and you have to set the ADON bit

only once to start the next conversion.

If the ADC is not used for a long time, it is recommended to switch it to power down mode to

decrease power consumption. This is done by clearing the ADON bit.

When the ADC is powered on, the digital input and output stages of the selected channel

are disabled independently on the GPIO pin configuration. It is therefore recommended to

select the analog input channel before powering on the ADC (see Section 24.5.3: Channel

selection).

24.5.2

ADC clock

The clock supplied to the ADC can by a prescaled fMASTER clock. The prescaling factor of

the clock depends on the SPSEL[2:0] bits in the ADC_CR1 register.

Table 72. ADC pins

Name

Signal type

Remarks

VDDA

Input, Analog

supply

Analog power supply. This input is bonded to VDD in

devices that have no external VDDA pin.

VSSA

Input, Analog

supply ground

Ground for analog power supply. This input is bonded to

VSS in devices that have no external VSSA pin.

VREF-

Input, Analog

Reference negative

The lower/negative reference voltage for the ADC,

ranging from VSSA to (VSSA + 500 mV).

This input is bonded to VSSA in devices that have no

external VREF- pin (packages with 48 pins or less)

VREF+

Input, Analog

Reference positive

The higher/positive reference voltage for the ADC,

ranging from 2.75 V to VDDA. This input is bonded to VDDA

in devices that have no external VREF+ pin (packages with

48 pins or less)

AIN[15:0]

Analog input signals

Up to 16 analog input channels, which are converted by

the ADC one at a time.

ADC_ETR

Digital input signals External trigger.

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