EMC2302
Dual RPM-Based PWM
Fan Controller
PRODUCT FEATURES
General Description
The EMC2302 is an SMBus compliant fan controller with
up to two independently controlled PWM fan drivers.
Each fan driver is controlled by a programmable
frequency PWM driver and Fan Speed Control algorithm
that operates in either a closed loop fashion or as a
directly PWM-controlled device.
The closed loop Fan Speed Control algorithm (FSC) has
the capability to detect aging fans and alert the system.
It will likewise detect stalled or locked fans and trigger
an interrupt.
Additionally, the EMC2302 offers a clock output so that
multiple devices may be chained and slaved to the
same clock source for optimal performance in large
distributed systems.
Data Brief
Features
Two Programmable Fan Control circuits (EMC2302)
—
—
—
—
—
—
4-wire fan compatible
High speed PWM (26 kHz)
Low speed PWM (9.5Hz - 2240 Hz)
Optional detection of aging fans
Fan Spin Up Control and Ramp Rate Control
Alert on Fan Stall
Watchdog Timer
RPM-based fan control algorithm
— 0.5% accuracy from 500 RPM to 16k RPM (external
crystal oscillator)
— 1% accuracy from 500 RPM to 16k RPM (internal clock)
SMBus 2.0 Compliant
— SMBus Alert compatible
Applications
Servers
Projectors
Industrial and Networking Equipment
Notebook Computers
CLK Pin can provide a clock source output
Available in a 10-pin MSOP Lead-free RoHS
Compliant package
Block Diagram
CLK
TACH1
Tach
Measurement
TACH2
Tachometer
Limit
Registers
SMBus
Slave
Protocol
SMCLK
SMDATA
ALERT#
PWM1
PWM
Drivers
PWM2
Fan Speed Control Algorithm
Fan Speed Control Algorithm
SMSC EMC2302
PRODUCT PREVIEW
Revision 1.3 (05-18-11)
Dual RPM-Based PWM Fan Controller
Order Number(s):
ORDERING NUMBER
EMC2302-1-AIZL-TR
EMC2302-2-AIZL-TR
PACKAGE
10-pin MSOP (Lead-free
RoHS compliant)
10-pin MSOP (Lead-free
RoHS compliant)
FEATURES
Two RPM-based fan speed control
algorithms. SMBus address 0101_110(r/w)
Two RPM-based fan speed control
algorithms. SMBus address 0101_111(r/w)
This product meets the halogen maximum concentration values per IEC61249-2-21
For RoHS compliance and environmental information, please visit
www.smsc.com/rohs
80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000 or 1 (800) 443-SEMI
Copyright © 2011 SMSC or its subsidiaries. All rights reserved.
Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for
construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC
reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications
before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent
rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated
version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors
known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not
designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property
damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of
this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC’s website at http://www.smsc.com. SMSC is a registered
trademark of Standard Microsystems Corporation (“SMSC”). Product names and company names are the trademarks of their respective holders.
SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE
OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL
DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT;
TORT; NEGLIGENCE OF SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD
TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
Revision 1.3 (05-18-11)
PRODUCT PREVIEW
2
SMSC EMC2302
Dual RPM-Based PWM Fan Controller
Package Outline
REVISIO N HISTORY
3
5
REVISION
A
D
ESCRIPTIO
N
INITIAL RELEASE
DATE
3/29/05
RELEASED BY
S. K.ILIEV
D
e
PIN 1 IDENTIFIER
AREA (D/2 X E1/2)
c
4
3
E1
E
4
2
10X b
SEE DETAIL "A"
TOP VIEW
END VIEW
A2
C
A
SEATING PLANE
A1
ccc C
SIDE VIEW
3-D VIEW
H
C
0.25
SEATING PLANE
GAUGE PLANE
NOTES:
1. ALL DI MENSIONS ARE IN MILLIMETER.
2. TOLERANCE ON THE TRUE POSITION OF EACH LEAD IS ± 0.04 mm AT MAXIMUM MATERIAL
CONDITION.
3. PACKAGE BODY DIMENSIONS "D" AND "E1" DO NOT INCLUDE MOLD/INTERLEAD PROTRUSIONS
OR FLASH. MAXIMUM MOLD PROTRUSIONS OR FLASH IS 0.15 mm (0.006 INCHES) PER END AND
SIDE. DIMENSIONS "D" AND "E1" ARE DETERMINED AT THE OUTERMOST EXTREMES OF THE
PLASTIC BODY, INCLUDING ANY MISMATCH BETWEEN TOP AND BOTTOM PLASTIC BODY. THEY
ARE DETERMINED AT DATUM PLANE "H".
4. DIMENSIONS "b" AND "c" APPLY TO THE FLAT SECTION OF THE LEAD BETWEEN 0.08 mm AND
0.15 mm FROM THE LEAD TIP.
5. DETAILS OF THE PIN 1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE
INDICATED.
UNLESS OTHERWISE SPEC
IFIED
DIM ENSI ON ARE IN MILLIMETERS
S
AN T OLERAN
D
CES ARE:
DEC AL
IM
±0.1
X.X
X.XX ±0.05
X.XXX ±0.025
ANGULAR
±1 °
THIR D ANG L E PRO J ECTION
0° - 8°
L
(0.95)
80 ARKAY DRI E
V
HAUPPAUGE, N 11
Y 788
USA
TITL
E
DETAIL "A"
D M AN T OL PER ASME Y14.5M - 19
I
D
94
M A TERIAL
N AM E
DRAWN
DAT E
-
-
S.K.IL IEV
CH ECKED
3/29 /0 5
3/29 /0 5
3/29 /0 5
PACKAGE OUTLINE
10 PIN TSSO P, 3x3 MM BODY, 0.50 MM PITCH
DWG NUM BER
F N ISH
I
S.K.IL IEV
S.K.IL IEV
MO-10-TSSOP-3x3
STD C OM PL IANC E
S HEET
REV
A
PRINT WIT H "SC
ALE TO FIT"
DO NOT SCALE DR ING
AW
APPR OVED
SC AL
E
1:1
JEDEC : MO-187
1 OF 1
Figure 1 EMC2302 Package Drawing - 10-Pin MSOP
SMSC EMC2302
PRODUCT PREVIEW
3
Revision 1.3 (05-18-11)
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