Diodes ZXBM2003 User Manual
Page 4
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
pin at half V
CC
. When H+ is high in relation to H- Ph2 is
the active drive.
ZXBM2001
ZXBM2002 ZXBM2003
S E M I C O N D U C T O R S
ISSUE 4 - OCTOBER 2004
4
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