US890 Melexis Company, US890 Datasheet - Page 3

• Manufacturer Part Number: US890
• Description: Two-coil Fan Driver ? High Output Curren
• Manufacturer: Melexis Company

Table 1: Absolute maximum ratings
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum-
rated conditions for extended periods may affect device reliability.
Table 2: Pin definitions and descriptions
3901000890
Rev 002
Two-coil fan
MilliTesla (mT), Gauss
V
I
Peak output current
Continuous output current
Locked rotor
FG
RD
Parameter
Pin Name
3 Glossary of Terms
4 Absolute Maximum Ratings
5 Pin Definitions and Descriptions
DD
DD
Pin number
A fan with two-coil windings where current alternates from 1 coil to the other
depending on the direction of the magnetic field.
Units of magnetic flux density :
1mT = 10 Gauss
Voltage on the common point of the fan coils.
Current supplying the chip which flows through the coil connected to the
switched off output driver.
The current flowing in the coil at start-up, only limited by the coil resistance
R
The average current flowing in the coil when the fan is spinning normally.
The state when the fan stopped spinning due to mechanical blockage.
Frequency generator or tachometer output
Rotation detection or alarm output
COIL
Function
and the output driver resistance R
Symbol
Two-Coil Fan Driver – High Output Current
Page 3 of 12
Value
Units
°
°
°
DSON.
US890 / US891
Data Sheet
Sep/07