STE12PS datasheet(13/44 Pages) STMICROELECTRONICS

13 / 44 page

Obsolete

Product(s)

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Product(s)

STE12PS

Functional description

13/44

●

CLASSIFICATION: The following operations are related to the classification procedure

for the corresponding channel

–

If classification is not enabled, the default Class 0 is assigned.

–

High Voltage detection command (17V) is issued via registers; detection timer is

started to execute the command for 15ms duration.

–

Wait for 5ms to acquire a stable measurement

–

Sampled sensing current values are acquired via A/D converter.

–

Average the previously acquired samples and report the resulting value in a

dedicated register. The power class is identified and the result is reported in the

Channel Status registers.

–

Channel is ready to be powered: if the smart-power algorithm is enabled (via the

MISCELLANEOUS registers) the channel is powered only if the required power is

within the remaining power budget; the channel can be powered regardless of the

power-check availability via registers.

If the power availability check has a positive result (or it hasn’t been performed), the channel

is powered. Otherwise, it is rejected, and the alarm flag raised in the Channel Events

available when the channel is ready to be switched-on.

Figure 4.

Detection and classification equivalent architecture

Detection/classification

+48V

12-bit A/D

converter

Digital

controller

x12

D2 x12

STE12PS

SPx

+4V

+8V

+17V

IDET_HVLV

180pF

Detection/classification

12-bit A/D

converter

Digital

controller

x12

D2 x12

SPx

+4V

+17V

IDET_HVLV

180pF

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