STPD01 datasheet(18/43 Pages) STMICROELECTRONICS

18 / 43 page

Figure 32. Cable drop configuration

Cout

Vout

ISNS+

PGND

BOOT

SGND

CDC

ISNS-

RCDC2

CBOOT

RSNS

Current

Monitor

DC/DC

Control

PVIN

Current limit

VSNS

RCDC1

RCABLE/2

VDRIVEL

Cout1

LOAD

RCABLE/2

VSNS

7.2.1

Output current monitor

The CDC pin provides a voltage proportional to the output current according to the following formula:

VCDC=k×ILOAD×RSENSE

(2)

where k=18

This formula is valid for ILOAD of more than about 300 mA.

Such a feature is very useful in case the device is embedded in a system with multiple ports and power sharing,

since the policy manager can read the current provided to the load regardless of I2C access.

7.3

Auto discharge

When one of the protections is triggered, the digital En bit is set or the enable pin is pulled low, the STPD01 turns

on a 60 mA current sink which discharges the LX node.

The auto discharge function can be disabled by I2C in case one of the protection events occurs or in case the

digital En bit is set, but it is always active when EN pin is pulled low.

7.4

Power-on

The power-on (Pon) is an open drain pin and provides information on the start-up of the device. After start-up, it

detects if the output voltage is within the +/-5% window of the regulation point, in this case the Pon pin goes to

high impedance.

The pin can be left floating if not used.

STPD01

Auto discharge

DS13473 - Rev 1

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