FT905 datasheet(30/56 Pages) FTDI

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FT905

_6_7_8/6/7/8 Embedded Microcontroller Datasheet

Version 1.0

Document No.: FT_001131 Clearance No.: FTDI#422

count up / down and signal an interrupt when the timer rolls over. The timers can also be

configured to be one-shot or in continuous mode.

4.16.1 Features:



Four user timers with pre-scaler.



Supports 16-bit pre-scaler with system clock reference.



Supports individual timer interrupt generated.



Supports one-shot and continuous count for timer.



Supports 32-bit counter watchdog.



Supports watchdog interrupt generated.

4.17 PWM

The FT905 series supports 7 separate independent PWM output channels. All channels share an

8-bit pre-scaler to scale the system clock frequency to the desired channels.

Each channel has its own 16-bit comparator value. This is the value that would be matched to

a preset 16-bit counter. When a channel’s 16-bit comparator value matches that of the 16-bit

counter, the corresponding PWM channel output will toggle. This 16-bit comparator value will

continue to count until it reaches its preset value, and the counter will just roll over.

A special feature allows the 7 channels each to also toggle its own output based on the

comparison results of other channels. Hence each channel potentially can have up to 8 toggle

edges. The PWM signal generated can be output as a single-shot or continuous output.

The PWM counter also supports an external trigger. There are 6 GPIOs selectable for an

external trigger.

PWM channel 0 and channel 1 can double as a stereo 11 kHz or 22 kHz PCM audio channel.

Once this feature is setup, the 16-bit or 8-bit PCM audio data can be downloaded to the PWM

local FIFO which can hold up to 64 bytes stereo or 128 bytes mono audio data. The data will

be played back based on the pre-scaler and 16-bit counter, and the data will be automatically

scaled to fit in the playback period if necessary.

4.17.1 Features:



Support 7 PWM output channels.



Support single-shot or continuous PWM data output.



Support external GPIO trigger.



Support 16-bit / 8-bit stereo PCM audio data output.



Control PCM FIFO full, empty, half-empty, and over-flow / under-flow buffer

management.



Support PCM volume control for audio playback.

4.18 Analog to Digital Converter (ADC)

The FT905 series has a low-power, high-speed, successive approximation Analog-to-Digital

Converter (ADC) that supports a 10-bit resolution and superior maximum sampling frequencies

of up to 1 Mega Samples Per-second (MSPS). This ADC accepts analog inputs ranging from the

ground supplies to the power supplies. This ADC can be used in various low-power and

medium-resolution applications.

4.18.1 Features:



10-bit successive approximation ADC.



Support 4 channels input.



Individual channels can be selected for conversion.



Power-down mode support.



Max conversion rate up to 1MSPS.

FT905 Datasheet(PDF) 30 Page - Future Technology Devices International Ltd.

FT905 Datasheet(HTML) 30 Page - Future Technology Devices International Ltd.

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