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PDF EMC2305 Data sheet ( Hoja de datos )
| Número de pieza | EMC2305 | |
| Descripción | Multiple RPM-Based PWM Fan Controller | |
| Fabricantes | SMSC | |
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EMC2305
Multiple RPM-Based PWM Fan Controller
for Five Fans
PRODUCT FEATURES
Datasheet
General Description
The EMC2305 is an SMBus compliant fan controller with
up to five 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 EMC2305 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
Five Programmable Fan Control circuits (EMC2305)
— 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
— Up to 3 Selectable Default Fan Speeds
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
— Up to 6 selectable SMBus addresses
— SMBus Alert compatible
CLK Pin can provide a clock source output
Available in a 16-pin 4mm x 4mm QFN Lead-free
RoHS Compliant package
Block Diagram
CLK
TACH1
TACH2
TACH3
TACH4
TACH5
PWM1
PWM2
PWM3
PWM4
PWM5
Tach
Measurement
Tachometer
Limit
Registers
PWM
Drivers
Fan Speed Control Algorithm
Fan Speed Control Algorithm
Fan Speed Control Algorithm
Fan Speed Control Algorithm
Fan Speed Control Algorithm
SMBus
Slave
Protocol
ADDR_SEL
SMCLK
SMDATA
ALERT#
SMSC EMC2305
DATASHEET
Revision 1.3 (05-18-11)
1 page  
Multiple RPM-Based PWM Fan Controller for Five Fans
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
Figure 7.3
Figure 7.4
EMC2305 Pin Diagram (16-Pin QFN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
SMBus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
System Diagram of EMC2305 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Spin Up Routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Ramp Rate Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Package Drawing - 16-Pin QFN 4mm x 4mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Package Dimensions - 16-Pin QFN 4mm x 4mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
PCB Footprint - 16-Pin QFN 4mm x 4mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
EMC2305 Package Markings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
SMSC EMC2305
5
DATASHEET
Revision 1.3 (05-18-11)
5 Page 
Multiple RPM-Based PWM Fan Controller for Five Fans
Datasheet
Table 2.2 Electrical Specifications (continued)
VDD = 3V to 3.6V, TA = -40°C to 125°C, all Typical values at TA = 27°C unless otherwise noted.
CHARACTERISTIC SYMBOL
MIN
TYP MAX UNIT
CONDITIONS
Input Low Voltage
Output High Voltage
Output Low Voltage
Leakage current
VIL
VOH
VOL
ILEAK
VDD -
0.4
0.8 V
V 8 mA current drive
0.4 V 8 mA current sink
ALERT# pin
±5
uA
Powered and unpowered
0°C < TA < 85°C
pull-up voltage < 3.6V
Note 2.2 All voltages are relative to ground.
2.2 SMBus Electrical Specifications
Table 2.3 SMBus Electrical Specifications
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
Input High Voltage
Input Low Voltage
Output High Voltage
Output Low Voltage
Input High/Low Current
Input Capacitance
Clock Frequency
Spike Suppression
Bus free time Start to
Stop
Setup Time: Start
Setup Time: Stop
Data Hold Time
Data Setup Time
VIH
VIL
VOH
VOL
IIH / IIL
CIN
fSMB
tSP
tBUF
tSU:STA
tSU:STP
tHD:DAT
tSU:DAT
SMBus Interface
2.0
0.8
VDD
- 0.4
0.4
V
V
V
V
±5 uA
5 pF
SMBus Timing
10 400 kHz
50 ns
1.3 us
0.6 us
0.6 us
0 us
0.6 us
4 mA current sink
Powered and unpowered
0°C < TA < 85°C
SMSC EMC2305
11
DATASHEET
Revision 1.3 (05-18-11)
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet EMC2305.PDF ] | |
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