ATS177
SINGLE OUTPUT HALL EFFECT LATCH
Description
Pin Assignments
ATS177 is an integrated Hall-Effect latch sensor designed for
electronic commutation of brush-less DC motor applications.
The device includes an on-chip Hall voltage generator for
magnetic sensing, a comparator that amplifies the Hall
voltage, and a schmitt trigger to provide switching hysteresis
for noise rejection, and open-collector output. An internal
bandgap regulator provides a temperature compensated
supply voltage for internal circuits and allows a wide operating
supply range.
(Top View)
3.
2.
DO
GND
Vcc
1.
SIP-3L
Applications
When the magnetic flux density (B) is larger than operate
point (Bop), output is switched on (DO pin is pulled low). The
output state is held on until a magnetic flux density reversal
falls below Brp. When B is less than Brp, the output is
switched off.
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Brush-less DC Motor
Brush-less DC Fan
Revolution counting
Speed measurement
The ATS177 is available in SIP-3L package.
Features
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Bipolar Hall-Effect latch sensor
3.5V to 20V DC operating voltage
Temperature compensation
Open-collector pre-driver
25mA maximum output sink current
Built-in reverse polarity protection
Operating temperature: -40°C to +125°C
SIP-3L package
Green Molding Compound (No Br, Sb) (Note 1)
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
Typical Application Circuit
+12V
D1
L1
R1
2K
L2
U1
R2
3K
1
3
Q1
NPN
Q2
NPN
VCC OUTPUT
GND
ATS177
2
+
+
C2
0.47uF
C1
0.47uF
Brush-less DC Fan
1 of 9
www.diodes.com
July 2010
© Diodes Incorporated
ATS177
Document number: DS31055 Rev. 6 - 2