UM0934 datasheet(12/113 Pages) STMICROELECTRONICS

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Functional overview

UM0934

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Doc ID 17389 Rev 2

Functional overview

The ST7570 embeds full S-FSK PHY and MAC protocol layers and services compliant with

the IEC 61334-5-1 standard ([2]), mainly developed for smart metering applications in

CENELEC A band, but suitable also for other command and control applications and remote

load management in CENELEC B and C bands.

A local port (UART) is available for communication with an external host, exporting all the

functions and services required to configure and control the device and its protocol stack.

2.1

Protocol stack

Below is a list of the protocol layers and functions embedded in the ST7570:

●

Physical layer: implemented in the PHY processor and exporting all the primitive

functions listed in [2], plus additional services for configuration, alarm management,

signal and noise amplitude estimation, phase detection, and statistical information

●

MAC layer: implemented on the protocol controller and exporting all the primitive

functions listed in [2], plus additional services for configuration

●

Management information base (MIB): an information database with all the data

required for proper configuration of the system (at both PHY and MAC layers)

●

Host interface: all the services of the PHY, MAC, and MIB are exported to an external

host through the local UART port.

Figure 1.

Functional overview

PHY Layer

HOST Interface

MAC Layer

MIB

ST7570

Local Port

(UART)

TXD

RXD

T_REQ

BR1

BR0

MIB

External

HOST

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