STR910FAM32 datasheet(35/99 Pages) STMICROELECTRONICS

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STR91xFAx32 STR91xFAx42 STR91xFAx44

Functional overview

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3.24

A/D converter (ADC) with DMA

The STR91xFA provides an eight-channel, 10-bit successive approximation analog-to-

digital converter. The ADC input pins are multiplexed with other functions on Port 4 as

shown in Table 9. Following are the major ADC features:

●

Fast conversion time, as low as 0.7 usec

●

Accuracy. Integral and differential non-linearity are typically within 4 conversion counts.

●

0 to 3.6V input range. External reference voltage input pin (AVREF) available on 128-

pin packages for better accuracy on low-voltage inputs. See Table 12: Operating

conditions, for restrictions to the relative voltage levels of VDDQ, AVDD, AVREF, and

AVREF_AVDD.

●

CPU Firmware may convert one ADC input channel at a time, or it has the option to set

the ADC to automatically scan and convert all eight ADC input channels sequentially

before signalling an end-of-conversion

●

Automatic continuous conversion mode is available for any number of designated ADC

input channels

●

Analog watchdog mode provides automatic monitoring of any ADC input, comparing it

against two programmable voltage threshold values. The ADC unit will set a flag or it

will interrupt the CPU if the input voltage rises above the higher threshold, or drops

below the lower threshold.

●

The ADC unit goes to stand-by mode (very low-current consumption) after any reset

event. CPU firmware may also command the ADC unit to stand-by mode at any time.

●

ADC conversion can be started or triggered by software command as well as triggers

from Timer/Counter (TIM), Motor Controller and input from external pin.

3.24.1

DMA

A programmable DMA channel may be assigned by CPU firmware to service each ADC

conversion result for fast DMA single-transfer.

3.25

Standard timers (TIM) with DMA

The STR91xFA has four independent, free-running 16-bit timer/counter modules designated

TIM0, TIM1, TIM2, and TIM3. Each general purpose timer/counter can be configured by

firmware for a variety of tasks including; pulse width and frequency measurement (input

capture), generation of waveforms (output compare and PWM), event counting, delay

timing, and up/down counting.

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