ST8500TR datasheet(7/37 Pages) STMICROELECTRONICS

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ST8500

Device architecture

2.1.1

Digital front-end (DFE)

Transmission and reception filter chains

The DFE includes programmable transmission/reception digital filter chains to fit the signal

bandwidth in different PLC modulation cases. The ADC and DAC clock frequencies are

controlled by the DFE to get the right sample rate fitting the filter chain configuration.

Automatic gain control (AGC)

The DFE implements the automatic gain control (AGC) block for the PGA, whose purpose is

to adapt the signal to the ADC dynamic range.

2.1.2

Analog front-end (AFE)

Reception chain

The ST8500 AFE features a programmable gain amplifier (PGA) and a dedicated analog-to-

digital converter (ADC) to achieve high RX sensitivity and a wide input range.

Transmission chain

The transmitted signal, generated in the digital domain, is fed into a dedicated digital-to-

analog converter (DAC).

The DAC output is then fed into a pre-driver for buffering and applying an additional gain.

Zero crossing comparator

The mains line zero crossing can be detected by providing a mains synchronous bipolar

(AC) signal at the input of this comparator.

The zero crossing comparator provides positive and negative event information

(rising/falling edge or high/low level).

Zero crossing information can also trigger an event for the GPT0 timer in order to capture

the zero crossing timestamp for the application purpose.

Line driver thermal sense

The AFE also includes the thermal sense (TS) block to detect the temperature of the line

driver.

Line driver current sense

The AFE also includes the current sense (CS) block to detect the output current of the line

driver.

2.1.3

Real-time engine (RTE)

To effectively and flexibly target the performance required by different PLC standards, the

ST8500 embeds a dedicated high performance fully programmable real-time engine (RTE).

It is able to address specific real-time PLC functionalities such as modulation and

demodulation according to different modulation schemes, advanced correction coding

algorithms (Viterbi, Convolutional, Reed-Solomon, etc.) and several other time-constrained

communication services.

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