STE12PS datasheet(22/44 Pages) STMICROELECTRONICS

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Functional description

STE12PS

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classification and powering. These measurements can be loaded into dedicated registers

via the I2C bus and are intended to be averaged over time in order to maximize PSSR and

noise rejection as well as minimize 50 to 60 Hz interference.

3.8

Power boost mode - 30W

3.8.1

Four channels in Auto mode

When this mode is activated, the device will run the classification extending the IEEE

classes with an extra PD_Class boost as detailed in

Table 4. If class boost is detected, an

equivalent double port (parallel of two channels) is switched-on allowing up to 30W of power

to be supplied. All the other IEEE classes behave as a standard port (powering on one

channel only).

Table 5 below describes channel parallelism:

Channels in boost mode behave as master or slave according to the above table.

Detection and classification are performed only on the master ports. If a class 0 to 4 PD is

detected, only MC is powered. Otherwise, if Boost Class is detected, both MC and the

related SC are powered. Once powered, any fault condition (short circuit, over current, over

power, PD disconnection) occurring either for MC or SC forces the reaction of both

channels. All status and measurement information are stored in registers pertaining to the

MC. Detection procedure is the same as the standard one while the classification phase is

performed with 3 classification impulses (total classification time 70ms).

3.8.2

Six channels in Manual mode

To activate this mode the device should be set with CH_NUMx ="00" and the Manual mode

must be selected. Under these conditions the output channels can be shorted together as

illustrated in

Figure 9 and according to the following table.

Table 5.

Power boost mode: master/slave channel parallelism

Master Channel (MC)

Slave Channel (SC)

Table 6.

Power boost mode: master/slave channel parallelism

Master Channel (MC)

Slave Channel (SC)

912

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