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PDF EMC2301 Data sheet ( Hoja de datos )
| Número de pieza | EMC2301 | |
| Descripción | RPM-Based PWM Fan Controller | |
| Fabricantes | SMSC | |
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EMC2301
RPM-Based PWM Fan Controller
PRODUCT FEATURES
Datasheet
General Description
The EMC2301 is an SMBus compliant fan controller with
a PWM fan driver. The 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.
Each 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 EMC2301 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.
Applications
Servers
Projectors
Industrial and Networking Equipment
Notebook Computers
Features
Programmable Fan Control circuit (EMC2301)
— 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
CLK Pin can provide a clock source output
Available in an 8-pin MSOP Lead-free RoHS
Compliant package
Block Diagram
CLK
TACH
Tach
Measurement
Tachometer
Limit
Registers
PWM
PWM
Drivers
Fan Speed Control Algorithm
SMBus
Slave
Protocol
SMCLK
SMDATA
ALERT#
SMSC EMC2301
DATASHEET
Revision 1.3 (05-18-11)
1 page  
RPM-Based PWM Fan Controller
Datasheet
List of Figures
Figure 1.1
Figure 3.1
Figure 4.1
Figure 4.2
Figure 4.3
Figure 7.1
Figure 7.2
EMC2301 Pin Diagram (8 pin MSOP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
SMBus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
System Diagram of EMC2301 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Spin Up Routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Ramp Rate Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
EMC2301 Package Drawing - 8-Pin MSOP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
EMC2301 Package Markings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
SMSC EMC2301
5
DATASHEET
Revision 1.3 (05-18-11)
5 Page 
RPM-Based PWM Fan Controller
Datasheet
Table 2.3 SMBus Electrical Specifications (continued)
VDD= 3V to 3.6V, TA = -40°C to 125°C Typical values are at TA = 27°C unless otherwise noted.
CHARACTERISTIC
SYMBOL MIN TYP MAX UNITS
CONDITIONS
Clock Low Period
Clock High Period
Clock/Data Fall time
Clock/Data Rise time
Capacitive Load
tLOW
tHIGH
tFALL
tRISE
CLOAD
1.3
0.6
us
us
300 ns Min = 20+0.1CLOAD ns
300 ns Min = 20+0.1CLOAD ns
400 pF per bus line
SMSC EMC2301
11
DATASHEET
Revision 1.3 (05-18-11)
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet EMC2301.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
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