Block Diagram (ZXBM2001):

Pin Assignments

Pin Functional Descriptions

1. VCC

- Applied voltage

This is the device supply voltage. For 5V to 12V fans this

can be supplied directly from the Fan Motor supply. For

fans likely to run in excess of the 18V maximum rating

for the device this will be supplied from an external

regulator such as a zener diode.

2. H+

- Hall input

3. H-

- Hall input

The rotor position of the Fan Motor is detected by a Hall

sensor whose output is applied to these pins. This

sensor can be either a 4 pin ‘naked’ Hall device or a 3

pin buffered switching type. For a 4 pin device the

differential Hall output signal is connected to the H+

and H- pins. For a 3 pin buffered Hall sensor the Hall

device output is attached to the H+ pin whilst the H- pin

has an external potential divider attached to hold the

the active drive.

ZXBM2001

ZXBM2002 ZXBM2003

SEMICO NDUC TORS

ISSUE 4 - OCTOBER 2004

4

Top View