ST10F280_12 datasheet(140/239 Pages) STMICROELECTRONICS

140 / 239 page

A/D converter

ST10F280

140/239

Doc ID 8673 Rev. 3

A/D converter

13.1

A/D converter module

A 10-bit A/D converter with 2 x 16 multiplexed input channels and a sample and hold circuit

is integrated on-chip. This A/D Converter does not have the self-calibration feature. Thus,

guaranteed Total Unadjusted Error is + 2 LSB. Refer to Section 20.3.1: A/D converter

characteristics for detailled characteristics. The sample time (for loading the capacitors) and

the conversion time is programmable and can be adjusted to the external circuitry.

Convertion time is fully equivalent to the one of previous generation A/D self-calibrated

Converter.

To remove high frequency components from the analog input signal, a low-pass filter must

be connected at the ADC input.

Overrun error detection/protection is controlled by the ADDAT register. Either an interrupt

request is generated when the result of a previous conversion has not been read from the

result register at the time the next conversion is complete, or the next conversion is

suspended until the previous result has been read. For applications which require less than

16 analog input channels, the remaining channel inputs can be used as digital input port

pins.

The A/D converter of the ST10F280 supports four different conversion modes:

Single channel conversion mode the analog level on a specified channel is sampled once

and converted to a digital result.

Single channel continuous mode the analog level on a specified channel is repeatedly

sampled and converted without software intervention.

Auto scan mode the analog levels on a pre-specified number of channels are sequentially

sampled and converted.

Auto scan continuous mode the number of pre-specified channels is repeatedly sampled

and converted.

Channel Injection Mode injects a channel into a running sequence without disturbing this

sequence. The peripheral event controller stores the conversion results in memory without

entering and exiting interrupt routines for each data transfer.

13.2

Multiplexage of two blocks of 16 analog Inputs

The ADC can manage 16 analog inputs, so to increase its capability, a new XADCMUX

and the second block of 16 channels on XPort10. The conversion result register stays

identical and only a software management can determine the block in use.

ST10F280 Datasheet(PDF) 140 Page - STMicroelectronics