FUNCTIONAL DESCRIPTION

The L9947 is a power interface circuit designed

for a multiplex system controlled by a parallel

µC

bus. The bus consists of four bidirectional data

wires D0 - D3 and three control wires read/write

(R/WN), mode (MODE) and chip select (CSN).

The device needs two supply voltages. The first

voltage supplies the half bridges, high side driver

and its driving part. The second one is a 5V stabi-

lized supply. The function of the device in the typi-

cal operating modes is described in the following

tables.

APPLICATION CIRCUIT DIAGRAM

Fogure 1: Recommended Application Circuit.

L9947

5/13