L99PD08 datasheet(10/41 Pages) STMICROELECTRONICS

10 / 41 page

Pin definitions and functions

L99PD08

10/41

Doc ID 15872 Rev 3

2.7.1

5.0 volt operation

The voltage regulator input is available at the terminal VDDIO, the output is available at

VCORE3.

In the 5V operation mode it is recommended to attach a decoupling capacitor on VCORE3

to stabilize the regulator. Due to the limited current capability of this regulator no external

loads should be attached on VCORE3.

2.7.2

3.3 volt operation

In applications with 3.3 V supply only, both, VDDIO and VCORE3 have to be attached

(shorted) to the local supply.

If the internal supply (VCORE3) is below the threshold of the internal power-and-reset

circuit, the device is in standby mode. The device is in low power consumption and no SPI

communications are possible.

2.8

GND (2 pins)

These two pins are the GND voltage supply of the device and have to be connected

externally.

2.9

Faultn

This active low pin indicates any internal error reported by the device. This can be a High

Side Driver failure or a communication error. In fault condition this open drain output is set to

low, while during reset it is left open. This pin has to be connected to a pull up resistor.

2.10

SYNC

The SYNC pin reflects the OUTx corresponding to the channel selected in the control

SYNC pin is actively pulled low.

Figure 3.

Example for SYNC pin functionality

OUT0

OUT1

SYNC

Channel 0 selected

Channel 1 selected

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