EMC2303-1-KP-TR Standard Microsystems (SMSC), EMC2303-1-KP-TR Datasheet

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EMC2303-1-KP-TR

Manufacturer Part Number
EMC2303-1-KP-TR
Description
Manufacturer
Standard Microsystems (SMSC)
Datasheet

Specifications of EMC2303-1-KP-TR

Operating Supply Voltage (typ)
3.3V
Operating Supply Voltage (min)
3V
Operating Supply Voltage (max)
3.6V
Operating Temp Range
-40C to 125C
Operating Temperature Classification
Automotive
Mounting
Surface Mount
Pin Count
12
Lead Free Status / RoHS Status
Compliant

Available stocks

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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
EMC2303-1-KP-TR
Manufacturer:
Microchip
Quantity:
8 000
Company:
Part Number:
EMC2303-1-KP-TR
Manufacturer:
Microchip
Quantity:
8 000
PRODUCT FEATURES
General Description
The EMC2303 is an SMBus compliant fan controller with
up to three 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 EMC2303 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
SMSC EMC2303
Servers
Projectors
Industrial and Networking Equipment
Notebook Computers
TACH1
TACH2
TACH3
PWM1
PWM2
PWM3
CLK
Drivers
Measurement
PWM
Tach
Fan Speed Control Algorithm
Fan Speed Control Algorithm
Fan Speed Control Algorithm
Tachometer
Registers
Block Diagram
DATASHEET
Limit
Features
Three Programmable Fan Control circuits (EMC2303)
Watchdog Timer
RPM-based fan control algorithm
SMBus 2.0 Compliant
CLK Pin can provide a clock source output
Available in a 12-pin 4mm x 4mm QFN Lead-free
— 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
— 0.5% accuracy from 500 RPM to 16k RPM (external
— 1% accuracy from 500 RPM to 16k RPM (internal clock)
— Up to 6 selectable SMBus addresses
— SMBus Alert compatible
RoHS Compliant package
Multiple RPM-Based
PWM Fan Controller for
Three Fans
EMC2303
crystal oscillator)
Protocol
SMBus
Slave
ADDR_SEL
SMCLK
SMDATA
ALERT#
Revision 1.2 (03-22-10)
Datasheet

EMC2303-1-KP-TR Summary of contents

Page 1

... PRODUCT FEATURES General Description The EMC2303 is an SMBus compliant fan controller with up to three 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 directly PWM-controlled device. ...

Page 2

... ORDERING NUMBER EMC2303-1-KP-TR This product meets the halogen maximum concentration values per IEC61249-2-21 For RoHS compliance and environmental information, please visit 80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123 Copyright © 2010 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 ...

Page 3

... Power Up Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.8.2 Continuous Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Chapter 5 Register Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 5.1 Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 5.1.1 Lock Entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5.2 Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5.3 Fan Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.3.1 Fan Status - 24h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.3.2 Fan Stall Status - 25h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 5.3.3 Fan Spin Status - 26h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 SMSC EMC2303 3 DATASHEET Revision 1.2 (03-22-10) ...

Page 4

... Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 5.22 Manufacturer ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 5.23 Revision Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Chapter 6 Typical Operating Curves Chapter 7 Package Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 7.1 EMC2303 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 7.2 Package Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Chapter 8 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 Revision 1.2 (03-22-10) Multiple RPM-Based PWM Fan Controller for Three Fans 4 DATASHEET Datasheet SMSC EMC2303 ...

Page 5

... Multiple RPM-Based PWM Fan Controller for Three Fans Datasheet List of Figures Figure 1.1 EMC2303 Pin Diagram (12-Pin QFN Figure 3.1 SMBus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 4.1 System Diagram of EMC2303 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Figure 4.2 Spin Up Routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Figure 4.3 Ramp Rate Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Figure 7.1 Package Drawing - 12-Pin QFN 4mm x 4mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Figure 7 ...

Page 6

... List of Tables Table 1.1 Pin Description for EMC2303 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 1.2 Pin Types Table 2.1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Table 2.2 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Table 2.3 SMBus Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 3.1 ADDR_SEL Pin Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 3.2 Protocol Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 3.3 Write Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 3.4 Read Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 3 ...

Page 7

... Multiple RPM-Based PWM Fan Controller for Three Fans Datasheet Chapter 1 Pin Description SMDATA SMCLK VDD Figure 1.1 EMC2303 Pin Diagram (12-Pin QFN) PIN NUMBER PIN NAME 1 SMDATA 2 SMCLK 3 VDD 4 ADDR_SEL 5 PWM1 SMSC EMC2303 1 EMC2303 2 12-QFN 3 Table 1.1 Pin Description for EMC2303 ...

Page 8

... Table 1.1 Pin Description for EMC2303 (continued) PIN NUMBER PIN NAME 6 TACH1 7 PWM2 8 TACH2 9 CLK 10 ALERT# 11 PWM3 12 TACH3 Bottom Pad GND The pin types are described in detail below. All pins labeled with (5V) are 5V tolerant. APPLICATION NOTE: For the 5V tolerant pins that have a pull-up resistor, the voltage difference between VDD and the 5V tolerant pad must never be more than 3 ...

Page 9

... Note 2.1 For the 5V tolerant pins that have a pull-up resistor, the pull-up voltage must not exceed 3.6V when the EMC2303 is unpowered. 2.1 Electrical Specifications 3.6V -40° ...

Page 10

... UNIT CONDITIONS 8 mA current drive current sink ALERT# pin Powered and unpowered uA 0°C < TA < 85°C pull-up voltage < 3.6V = 27°C unless otherwise noted. CONDITIONS 4 mA current sink Powered and unpowered 0°C < TA < 85°C SMSC EMC2303 ...

Page 11

... Typical values are CHARACTERISTIC SYMBOL Clock Low Period t LOW Clock High Period t HIGH Clock/Data Fall time t FALL Clock/Data Rise time t RISE Capacitive Load C LOAD SMSC EMC2303 = 27°C unless otherwise noted. A MIN TYP MAX UNITS 1.3 us 0.6 us 300 ns Min = 20+0.1C 300 ns Min = 20+0.1C 400 pF ...

Page 12

... Chapter 3 Communications 3.1 System Management Bus Interface Protocol The EMC2303 communicates with a host controller, such as an SMSC SIO, through the SMBus. The SMBus is a two-wire serial communication protocol between a computer host and its peripheral devices. A detailed timing diagram is shown in however, the EMC2303 will not stretch the clock signal. ...

Page 13

... The SMBus Stop bit is defined as a transition of the SMBus Data line from a logic ‘0’ state to a logic ‘1’ state while the SMBus clock line logic ‘1’ state. When the EMC2303 detects an SMBus Stop bit has been communicating with the SMBus protocol, it will reset its client interface and prepare to receive further communications ...

Page 14

... SMBus formatting for Block Read and Block Write protocols. 3.2 SMBus Protocols The EMC2303 is SMBus 2.0 compatible and supports Send Byte, Read Byte, Receive Byte and Write Byte as valid protocols as shown below. It will respond to the Alert Response Address protocol but is not in full compliance. ...

Page 15

... When it detects that the ALERT# pin is asserted, the host will send the Alert Response Address (ARA) to the general address of 0001_100xb. All devices with active interrupts will respond with their client address as shown in SMSC EMC2303 Table 3.6. Table 3.6 Receive Byte Protocol ...

Page 16

... The EMC2303 will respond to the ARA in the following way if the ALERT# pin is asserted. 1. Send Slave Address and verify that full slave address was sent (i.e. the SMBus communication from the device was not prematurely stopped due to a bus contention event). ...

Page 17

... Circuit 4.1 Fan Control Modes of Operation The EMC2303 has two modes of operation for each fan driver. Each mode of operation uses the Ramp Rate control and Spin Up Routine. 1. Direct Setting Mode - in this mode of operation, the user directly controls the fan drive setting. ...

Page 18

... PWM Fan Driver The EMC2303 supports 3 PWM output drivers. Each output driver can be configured to operate as an open-drain (default) or push-pull driver and each driver can be configured with normal or inverse polarity. Additionally, the PWM frequencies are independently programmable with ranges from 9.5Hz to 26kHz in four programmable frequency bands ...

Page 19

... ALERT# pin. The EMC2303 works with fans that operate up to 16,000 RPMs and provide a valid tachometer signal. The fan controller will function either with an externally supplied 32.768kHz clock source or with it’s own internal 32kHz oscillator depending on the required accuracy ...

Page 20

... This is useful to detect aging fan conditions (where the fan’s natural maximum speed degrades over time speed setting that is faster than the fan is capable of. The EMC2303 contains circuitry that detects that the programmed fan speed can be reached by the fan. If the target fan speed cannot be reached within a user defined band of tach counts at maximum drive, the DRIVE_FAIL status bits are set and the ALERT# pin is asserted ...

Page 21

... Internal Clock Alternately, the EMC2303 may be configured to use its internal clock as a clock output to drive other fan driver devices. When configured to operate in this mode, the device uses its internal clock for tachometer reading and drives the CLK pin using a push-pull driver. ...

Page 22

... Target Count Changed 4.6.1 Power Up Options The EMC2303 allows for one of four fan speed options upon device power up depending on the status of the pull-up resistor on the ADDR_SEL pin and the CLK pin. If the ADDR_SEL pin decode enables the CLK pin (see Table ...

Page 23

... Watchdog Timer The EMC2303 contains an internal Watchdog Timer for all fan drivers. The Watchdog timer monitors the SMBus traffic for signs of activity and works in two different modes based upon device operation. These modes are Power Up Operation and Continuous Operation as described below. ...

Page 24

... When configured to operate in Continuous Operation, the Watchdog timer will start immediately. The timer will be reset by any access (read or write) to the SMBus register set. The four second Watchdog timer will restart upon completion of SMBus activity. Revision 1.2 (03-22-10) Multiple RPM-Based PWM Fan Controller for Three Fans 24 DATASHEET Datasheet SMSC EMC2303 ...

Page 25

... Fan 1 33h R/W Configuration 2 35h R/W Gain 1 SMSC EMC2303 Table 5.1 EMC2303 Register Set FUNCTION Configuration and control Configures the clocking and watchdog functionality Stores the status bits for the RPM- based Fan Speed Control Algorithm Stores status bits associated with a ...

Page 26

... Table 5.1 EMC2303 Register Set (continued) REGISTER ADDR R/W NAME Fan 1 Spin Up 36h R/W Configuration 37h R/W Fan 1 Max Step Fan 1 Minimum 38h R/W Drive Fan 1 Valid TACH 39h R/W Count Fan 1 Drive Fail 3Ah R/W Band Low Byte Fan 1 Drive Fail ...

Page 27

... Multiple RPM-Based PWM Fan Controller for Three Fans Datasheet Table 5.1 EMC2303 Register Set (continued) REGISTER ADDR R/W NAME Fan 2 Valid TACH 49h R/W Count Fan 2 Drive Fail 4Ah R/W Band Low Byte Fan 2 Drive Fail 4Bh R/W Band High Byte ...

Page 28

... R/W Configuration The Configuration Register controls the basic functionality of the EMC2303. The bits are described below. The Configuration Register is software locked. Bit 7 - MASK - Blocks the ALERT# pin from being asserted. ‘0’ (default) - The ALERT# pin is unmasked. If any bit in either status register is set, the ALERT# pins will be asserted (unless individually masked via the Mask Register). ‘ ...

Page 29

... The CLK pin acts as a clock output and is a push-pull driver. Bit 0 - USE_EXT_CLK - Enables the EMC2303 to use a clock present on the CLK pin as the tachometer clock. If the DR_EXT_CLK bit is set, then this bit is ignored and the device will use the internal oscillator. ‘ ...

Page 30

... Section 4.4.2 and Section Table 5.4 Fan Interrupt Enable Register DATASHEET Multiple RPM-Based PWM Fan Controller for Three Fans Section 5.12). All bits are cleared upon a read if the FAN3_ FAN2_ - INT_EN INT_EN SMSC EMC2303 Datasheet 4.6). All bits B0 DEFAULT FAN1_ 00h INT_EN ...

Page 31

... The PWM Base Frequency register determines the base frequency that is used with the PWM Divide register to determine the final PWM frequency. Each PWM frequency is set by the base frequency and its respective divide ratio (see SMSC EMC2303 Table 5.5 PWM Configuration Registers B6 ...

Page 32

... Multiple RPM-Based PWM Fan Controller for Three Fans Table 5.7 PWM_BASEx[1:0] Bit Decode Table 5.8 Fan Driver Setting Registers 128 128 128 Equation [1]. ⎛ ⎞ VALUE × -------------------- - = 100% ⎝ ⎠ 255 32 DATASHEET Datasheet BASE FREQUENCY 26.00kHz (default) 19.531kHz 4,882Hz 2,441Hz DEFAULT 00h 00h 00h [1] SMSC EMC2303 ...

Page 33

... TACH Target Register. Bits RANGEx[1:0] - Adjusts the range of reported and programmed tachometer reading values. The RANGE bits determine the weighting of all TACH values (including the Valid TACH Count, TACH Target, and TACH reading) as shown in RANGEX[1: SMSC EMC2303 Table 5.9 PWM Divide Registers 128 64 ...

Page 34

... Table 5.13 Update Time DATASHEET Datasheet TACH COUNT RPM MULTIPLIER 2000 4 4000 8 Table 5.12 is used as a direct multiplier EFFECTIVE TACH MULTIPLIER (BASED ON 2 POLE FANS) 0.5 1 1.5 2 UPDATE TIME 100ms 200ms 300ms 400ms (default) 500ms SMSC EMC2303 ...

Page 35

... TACHx pin. ‘0’ - The glitch filter is disabled. ‘1’ (default) - The glitch filter is enabled. Bits DER_OPTx[1:0] - Control some of the advanced options that affect the derivative portion of the RPM-based Fan Speed Control Algorithm as shown in SMSC EMC2303 Table 5.13 Update Time (continued) UPDATEX[2: ...

Page 36

... Table 5.16 Error Range Options Table 5.17 Gain Registers GAIND1[1:0] GAINI1[1: GAIND2[1:0] GAINI2[1: GAIND3[1:0] GAINI3[1:0] 36 DATASHEET Datasheet OPERATION No derivative options used (default) OPERATION 0 RPM (default) 50 RPM 100 RPM 200 RPM DEFAULT GAINP1[1:0] 2Ah GAINP2[1:0] 2Ah GAINP3[1:0] 2Ah SMSC EMC2303 ...

Page 37

... The Fan Spin Up Configuration registers control the settings of Spin Up Routine. The Fan Spin Up Configuration registers are software locked. Bit DRIVE_FAIL_CNTx[1:0] - Determines how many update cycles are used for the Drive Fail detection function as shown in the desired tach target. SMSC EMC2303 Table 5.18 Gain Decode ...

Page 38

... Drive Fail detection circuitry will count for 16 update 1 periods 32 - the Drive Fail detection circuitry will count for 32 update 0 periods 64 - the Drive Fail detection circuitry will count for 64 update 1 periods Table 5.21 Spin Level Table 5.22. 38 DATASHEET Datasheet SPIN UP DRIVE LEVEL 30% 35% 40% 45% 50% 55% 60% (default) 65% SMSC EMC2303 ...

Page 39

... Algorithm or by manual settings) exceeds the current fan drive setting by greater than the Fan Step Register setting, the EMC2303 will limit the fan drive change to the value of the Fan Step Register. It will use the Update Time to determine how often to update the drive settings ...

Page 40

... B4 B3 4096 2048 1024 512 256 4096 2048 1024 512 256 4096 2048 1024 512 256 40 DATASHEET Datasheet DEFAULT Section 5.17 DEFAULT 128 64 32 F5h 128 64 32 F5h 128 64 32 F5h Equation [2] in Section 5.18 SMSC EMC2303 66h (40%) 66h (40%) 66h (40%) ...

Page 41

... DRIVE_FAIL status bit will be set and an interrupt generated. 5.17 TACH Target Registers ADDR R/W REGISTER TACH Target 3Ch R/W 1 Low Byte TACH Target 3Dh R/W 1 High Byte TACH Target 4Ch R 2 Low Byte TACH Target 4Dh R/W 2 High Byte SMSC EMC2303 4096 2048 1024 512 256 4096 ...

Page 42

... Table 5.28 TACH Reading Registers 4096 2048 1024 512 256 4096 2048 1024 512 256 4096 2048 1024 512 256 Conversion. 42 DATASHEET Datasheet DEFAULT - - - F8h 128 64 32 FFh DEFAULT 128 64 32 FFh - - - F8h 128 64 32 FFh - - - F8h 128 64 32 FFh - - - F8h Equation SMSC EMC2303 ...

Page 43

... Product Features Register ADDRESS R/W REGISTER Product FCh R Features The Product Features register shows those functions that are enabled by external pin states. Bits 5-3 - ADR[2:0] - Indicates the selected SMBus address as determined by the ADDR_SEL pin. SMSC EMC2303 ( ) n 1 – × × TACH 1 × ...

Page 44

... Multiple RPM-Based PWM Fan Controller for Three Fans Table 5.31 ADDR_SEL Pin Configuration ADR[2: Table 5.32 FAN_SPD Pin Configuration Table 5.33 Product ID Register DATASHEET Datasheet SLAVE ADDRESS 0101_110(r/w) 0101_111(r/w) 0101_100(r/w) 0101_101(r/w) 1001_100(r/w) 1001_101(r/w) FAN SPEED 0% Drive 30% Drive 50% Drive 75% Drive 100% Drive SMSC EMC2303 DEFAULT 35h ...

Page 45

... FEh R Manufacturer ID The Manufacturer ID Register contains an 8-bit word that identifies SMSC. 5.23 Revision Register ADDR R/W REGISTER FFh R Revision The Revision Register contains an 8-bit word that identifies the die revision. SMSC EMC2303 Table 5.34 Manufacturer ID Register Table 5.35 Revision Register B7 B6 ...

Page 46

... Tachometer Measurement Accuracy vs. Supply Voltage 1 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 2.95 3.05 100 150 46 DATASHEET Datasheet Supply Current vs. Supply Voltage 3.15 3.25 3.35 3.45 3.55 3.65 Supply Voltage (V) Supply Voltage (V) 3.15 3.25 3.35 3.45 3.55 3.65 Supply Voltage (V) SMSC EMC2303 ...

Page 47

... RPM Target from 0 RPM -> 8000 RPM @ time PWM Output 10x Zoom on PWM Output Spin Up Routine Ends – begins normal Duty Cycle operation Measured Update Time ends, PWM duty cycle changed SMSC EMC2303 27000 26800 26600 26400 26200 26000 25800 25600 25400 25200 25000 2 ...

Page 48

... Chapter 7 Package Drawing 7.1 EMC2303 Package Information Figure 7.1 Package Drawing - 12-Pin QFN 4mm x 4mm Revision 1.2 (03-22-10) Multiple RPM-Based PWM Fan Controller for Three Fans 48 DATASHEET Datasheet SMSC EMC2303 ...

Page 49

... Multiple RPM-Based PWM Fan Controller for Three Fans Datasheet Figure 7.2 Package Dimensions - 12-Pin QFN 4mm x 4mm Figure 7.3 PCB Footprint - 12-Pin QFN 4mm x 4mm SMSC EMC2303 49 DATASHEET Revision 1.2 (03-22-10) ...

Page 50

... LINE: 1 – SMSC Logo without circled (R) symbol LINE: 2 – Device Number LINE: 3 – Last 7 digits of Lot Number LINE: 4 – Revision and Country Code (RCC) Figure 7.4 EMC2303 Package Markings Revision 1.2 (03-22-10) Multiple RPM-Based PWM Fan Controller for Three Fans TOP ...

Page 51

... Rev. 1.1 (10-12-09) Table 2.2, "Electrical Specifications" Chapter 6, Typical Operating Curves Rev. 1.0 (05-15-09) Initial release of datasheet SMSC EMC2303 Table 8.1 Customer Revision History Updated SMBus Data Hold Time spec Tachometer Setting Accuracy max was changed from +/-3% to +/-2%. Added typical operating curves 51 ...

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