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PDF EMC2302 Data sheet ( Hoja de datos )
| Número de pieza | EMC2302 | |
| Descripción | Dual RPM-Based PWM Fan Controller | |
| Fabricantes | SMSC | |
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EMC2302
Dual RPM-Based PWM Fan Controller
PRODUCT FEATURES
Datasheet
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.
Applications
Servers
Projectors
Industrial and Networking Equipment
Notebook Computers
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
CLK Pin can provide a clock source output
Available in a 10-pin MSOP Lead-free RoHS
Compliant package
Block Diagram
CLK
TACH1
TACH2
Tach
Measurement
Tachometer
Limit
Registers
PWM1
PWM2
PWM
Drivers
Fan Speed Control Algorithm
Fan Speed Control Algorithm
SMBus
Slave
Protocol
SMCLK
SMDATA
ALERT#
SMSC EMC2302
DATASHEET
Revision 1.3 (05-18-11)
1 page  
Dual 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
EMC2302 Pin Diagram (10-Pin MSOP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
SMBus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
System Diagram of EMC2302 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Spin Up Routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Ramp Rate Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
EMC2302 Package Drawing - 10-Pin MSOP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
EMC2302 Package Markings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
SMSC EMC2302
5
DATASHEET
Revision 1.3 (05-18-11)
5 Page 
Dual 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 EMC2302
11
DATASHEET
Revision 1.3 (05-18-11)
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet EMC2302.PDF ] | |
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