STCOM datasheet(28/58 Pages) STMICROELECTRONICS

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Description

STCOM

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DocID028515 Rev 1

1.11

Temperature sensors and overtemperature protection

The STCOM embeds an overtemperature protection mechanism, with fixed temperature

threshold, preventing the device from overheating. This automatic protection acts by

shutting down the PLC line driver when overheating occurs during PLC transmission. The

normal operation of the line driver is restored automatically as the overtemperature event

has ended.

In addition to the overtemperature automatic protection, information from two temperature

sensors is provided:



The line driver temperature sensor



The low power temperature sensor

The first sensor monitors the line driver temperature and can be used by the RTE to prevent

the line driver to be shut down abruptly by the overtemperature protection. The way to use

this information may depend on the protocol and on the version of the RTE firmware, so its

usage (if any) will be described within the specific firmware documentation released by

STMicroelectronics®.

The second sensor monitors the temperature of the low power section of the device. It is

internally connected to the channel 8 of the general purpose 12-bit ADC (see Section :

General purpose analog-to-digital converter (ADC) on page 19 for further details) and it can

be used by the application for its own purposes.

The accuracy of the sensors is guaranteed by design. In case a higher accuracy is required

on the low power temperature sensor, the user shall adopt its own calibration procedure

during the application manufacturing.

1.12

Boot modes

The STCOM provides different security levels of protection:

Level 1: unsecure

The Cortex™-M4 is accessible through the JTAG and it's possible to download the

firmware in the embedded Flash using debugger plug-in or to load it from the external

NVM using the system boot functionality. It's also possible to download customer OTP

data such as cryptography keys. The shadow sector is not accessible.

Level 2: secure

The JTAG is blocked and it's not possible to access the embedded Flash for external

read or write operation. It's possible to load the ciphered firmware image from the

external NVM and upgrade the firmware thanks to the IAP functionality. Read access to

the embedded Flash is possible to the CortexTM-M4 code, including the shadow sector.

Level 3: secure and locked

The JTAG is blocked and it's not possible to access the embedded Flash for external

read or write operation. Some embedded Flash sectors are locked. It's possible to

upgrade the firmware thanks to the IAP functionality unless the new image tries to

change a locked area. Read access to the embedded Flash is possible to the

CortexTM-M4 code, including the shadow sector.

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