TPS2384 datasheet(11/46 Pages) TI

Part #	TPS2384

Description	QUAD INTEGRATED POWER SOURCING EQUIPMENT POWER MANAGER

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Manufacturer	TI [Texas Instruments]

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TPS2384

SLUS634A − NOVEMBER 2004 − REVISED DECEMBER 2004

11

www.ti.com

AUTO MODE FUNCTIONAL DESCRIPTION

Auto Mode

Auto mode (MS = low) is a basic approach to building power sourcing equipment power manager systems

without a micro-controller. When AM has been selected the TPS2384 automatically performs the following

functions;

D Discovery of IEEE 802.3af compliant power devices (PD)

D Classification

D Power delivery

D Port over/under voltage detection

D Port over current detection (350 mA < IPORT < 400 mA)

D Port maximum current limit (400 mA < IPORT < 450 mA)

D DC disconnect (5 mA < IPORT< 10 mA)

D Thermal shutdown protection (Tj > 150° C)

D Internal oscillator watch dog

In AM all the information in the read registers are available through the I2C interface along with controlling some

states by writing to the appropriate registers. This gives the user the ability to use the TPS2384 in a semi-auto

mode where the TPS2384 auto detects compliant PD’s and a host can access the A/D registers and class

information for power management, turn-on or off ports and disable dc disconnect or discovery faults.

The write registers that still active in AM are;

D All ports disable – common write register 0001

D Over/Under Voltage Faults − common write register 0001

D Software reset − common write register 0001

D Disconnect disable – write register 0001

D Discovery fault disable – write register 0001

D Port enable – write register 0011

D Power mode class over current threshold enable − write register 0011

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