EMC2305-1-AP-TR SMSC, EMC2305-1-AP-TR Datasheet
EMC2305-1-AP-TR
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EMC2305-1-AP-TR Summary of contents
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... PRODUCT FEATURES 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 directly PWM-controlled device. ...
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... ORDERING NUMBER EMC2305-1-AP-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 ...
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... Power Up Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.8.2 Continuous Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Chapter 5 Register Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.1 Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.1.1 Lock Entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 5.2 Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 5.3 Fan Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5.3.1 Fan Status - 24h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5.3.2 Fan Stall Status - 25h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5.3.3 Fan Spin Status - 26h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 SMSC EMC2305 3 DATASHEET Revision 1.2 (03-22-10) ...
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... Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 5.22 Manufacturer ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 5.23 Revision Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 Chapter 6 Typical Operating Curves Chapter 7 Package Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 7.1 EMC2305 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 7.2 Package Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Chapter 8 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Revision 1.2 (03-22-10) Multiple RPM-Based PWM Fan Controller for Five Fans 4 DATASHEET Datasheet SMSC EMC2305 ...
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... Multiple RPM-Based PWM Fan Controller for Five Fans Datasheet List of Figures Figure 1.1 EMC2305 Pin Diagram (16-Pin QFN Figure 3.1 SMBus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Figure 4.1 System Diagram of EMC2305 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Figure 4.2 Spin Up Routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Figure 4.3 Ramp Rate Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Figure 7.1 Package Drawing - 16-Pin QFN 4mm x 4mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Figure 7 ...
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... List of Tables Table 1.1 Pin Description for EMC2305 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 1.2 Pin Types Table 2.1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 2.2 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 2.3 SMBus Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Table 3.1 ADDR_SEL Pin Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 3.2 Protocol Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 3.3 Write Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 3.4 Read Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 3 ...
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... Multiple RPM-Based PWM Fan Controller for Five Fans Datasheet Chapter 1 Pin Description SMDATA SMCLK VDD ADDR_SEL Figure 1.1 EMC2305 Pin Diagram (16-Pin QFN) PIN NUMBER PIN NAME 1 SMDATA 2 SMCLK 3 VDD 4 ADDR_SEL 5 PWM1 SMSC EMC2305 1 EMC2305 2 16-QFN 3 4 Table 1.1 Pin Description for EMC2305 ...
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... Table 1.1 Pin Description for EMC2305 (continued) PIN NUMBER PIN NAME 6 TACH1 7 PWM2 8 TACH2 9 PWM3 10 TACH3 11 CLK 12 ALERT# 13 PWM4 14 TACH4 15 PWM5 16 TACH5 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 ...
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... PIN TYPE Power AIO DI DO DIOD OD SMSC EMC2305 Table 1.2 Pin Types DESCRIPTION This pin is used to supply power or ground to the device. Analog input / output - this pin is used for analog signals Digital Input - this pin is used as a digital input. This pin is 5V tolerant. ...
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... 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 EMC2305 is unpowered. 2.1 Electrical Specifications 3.6V -40° ...
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... SP Bus free time Start to t BUF Stop Setup Time: Start t SU:STA Setup Time: Stop t SU:STP Data Hold Time t HD:DAT Data Setup Time t SU:DAT SMSC EMC2305 A MIN TYP MAX VDD - 0.4 0.4 ±5 A MIN TYP MAX UNITS SMBus Interface 2.0 V 0.8 ...
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... Capacitive Load C LOAD Revision 1.2 (03-22-10) Multiple RPM-Based PWM Fan Controller for Five Fans = 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 per bus line 12 DATASHEET Datasheet CONDITIONS ns LOAD ns LOAD SMSC EMC2305 ...
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... Chapter 3 Communications 3.1 System Management Bus Interface Protocol The EMC2305 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 EMC2305 will not stretch the clock signal. ...
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... 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 EMC2305 detects an SMBus Stop bit has been communicating with the SMBus protocol, it will reset its client interface and prepare to receive further communications ...
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... SMBus formatting for Block Read and Block Write protocols. 3.2 SMBus Protocols The EMC2305 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. ...
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... Multiple RPM-Based PWM Fan Controller for Five Fans REGISTER DATA NACK STOP XXh 1 0 -> 1 REGISTER ACK DATA 0 XXh REGISTER DATA ACK XXh 0 START SLAVE RD ADDRESS 1 ->0 YYYY_YYYb 1 ACK . . . REGISTER DATA XXh SMSC EMC2305 Datasheet ACK 0 STOP 0 -> 1 ACK REGISTER DATA 0 XXh NACK STOP 1 0 -> 1 ...
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... The EMC2305 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). ...
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... Circuit 4.1 Fan Control Modes of Operation The EMC2305 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. ...
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... PWM Fan Driver The EMC2305 supports 5 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 ...
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... ALERT# pin. The EMC2305 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 ...
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... 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 EMC2305 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 ...
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... Internal Clock Alternately, the EMC2305 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. ...
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... Target Count Changed 4.6.1 Power Up Options The EMC2305 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 ...
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... Watchdog Timer The EMC2305 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. ...
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... Continuous Operation 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. SMSC EMC2305 25 DATASHEET Revision 1.2 (03-22-10) ...
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... Fan 1 33h R/W Configuration 2 Revision 1.2 (03-22-10) Multiple RPM-Based PWM Fan Controller for Five Fans Table 5.1 EMC2305 Register Set FUNCTION Configuration and control Configures the clocking and watchdog functionality Stores the status bits for the RPM- based Fan Speed Control Algorithm ...
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... Multiple RPM-Based PWM Fan Controller for Five Fans Datasheet Table 5.1 EMC2305 Register Set (continued) REGISTER ADDR R/W NAME 35h R/W Gain 1 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 ...
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... Table 5.1 EMC2305 Register Set (continued) REGISTER ADDR R/W NAME Fan 2 Minimum 48h R/W Drive 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 TACH 2 Target 4Ch R/W ...
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... Multiple RPM-Based PWM Fan Controller for Five Fans Datasheet Table 5.1 EMC2305 Register Set (continued) REGISTER ADDR R/W NAME Fan 3 Drive Fail 5Ah R/W Band Low Byte Fan 3 Drive Fail 5Bh R/W Band High Byte TACH 3 Target 5Ch R/W Low Byte ...
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... Table 5.1 EMC2305 Register Set (continued) REGISTER ADDR R/W NAME TACH 4 Target 6Dh R/W High Byte TACH 4 Reading 6Eh R High Byte TACH 4 Reading 6Fh R Low Byte 70h R/W Fan 5 Setting 71h R/W PWM 5 Divide Fan 5 72h R/W Configuration1 Fan 5 73h R/W ...
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... R/W Configuration The Configuration Register controls the basic functionality of the EMC2305. 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). ‘ ...
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... The CLK pin acts as a clock output and is a push-pull driver. Bit 0 - USE_EXT_CLK - Enables the EMC2305 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. ‘ ...
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... ALERT# pin to be asserted when an error condition is detected. Bit 4 - FAN5_INT_EN - Allows Fan 5 to assert the ALERT# pin if an error condition is detected. Bit 3 - FAN4_INT_EN - Allows Fan 4 to assert the ALERT# pin if an error condition is detected. SMSC EMC2305 Section 4.4.2 and Section Table 5 ...
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... The PWM 1 output is configured as a push-pull output. Revision 1.2 (03-22-10) Table 5.5 PWM Configuration Registers POLARITY - - - PWM5_OT 34 DATASHEET Multiple RPM-Based PWM Fan Controller for Five Fans POLARITY POLARITY POLARITY PWM4_OT PWM3_OT PWM2_OT SMSC EMC2305 Datasheet B0 DEFAULT POLARITY 00h 1 PWM1_OT 00h ...
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... Controls the base frequency of PWM drivers 1-3 Bits 5-6 - PWM_BASE3[1:0] - Determines the base frequency of the PWM3 driver. Bits 3-2 - PWM_BASE2[1:0] - Determines the base frequency of the PWM2 driver. Bits 1-0 - PWM_BASE1[1:0] - Determines the base frequency of the PWM1 driver. PWM_BASEX[1: SMSC EMC2305 Table 5.6 PWM Base Frequency Registers ...
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... B5 B4 128 128 128 128 128 Equation [1]. ⎛ ⎞ VALUE × -------------------- - = 100% ⎝ ⎠ 255 Table 5.9 PWM Divide Registers 128 128 128 128 128 DATASHEET Datasheet DEFAULT 00h 00h 00h 00h 00h [ DEFAULT 01h 01h 01h 01h 01h SMSC EMC2305 ...
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... Actual RPM to achieve the Reported RPM. It should only be applied if the number of edges measured does not match the number of edges expected based on the number of poles of the fan (which is fixed for any given fan). SMSC EMC2305 Table 5.10 Fan Configuration 1 Registers B7 ...
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... RRC3 EN3 38 DATASHEET Multiple RPM-Based PWM Fan Controller for Five Fans EFFECTIVE TACH MULTIPLIER (BASED ON 2 POLE FANS) 0.5 1 1.5 2 UPDATE TIME 100ms 200ms 300ms 400ms (default) 500ms 800ms 1200ms 1600ms ERR_RNG1[1:0] ERR_RNG2[1:0] ERR_RNG3[1:0] SMSC EMC2305 Datasheet B0 DEFAULT - 28h - 28h - 28h ...
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... The algorithm will continue to monitor the fan speed and calculate necessary drive setting changes based on the error; however, these changes are ignored. SMSC EMC2305 Table 5.14 Fan Configuration 2 Registers (continued) B7 ...
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... GAIND1[1:0] GAINI1[1: GAIND2[1:0] GAINI2[1: GAIND3[1:0] GAINI3[1: GAIND4[1:0] GAINI4[1: GAIND5[1:0] GAINI5[1:0] Table 5.18 Gain Decode 0 RESPECTIVE GAIN FACTOR DATASHEET Datasheet OPERATION 0 RPM (default) 50 RPM 100 RPM 200 RPM DEFAULT GAINP1[1:0] 2Ah GAINP2[1:0] 2Ah GAINP3[1:0] 2Ah GAINP4[1:0] 2Ah GAINP5[1:0] 2Ah 1x 2x SMSC EMC2305 ...
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... The Spin Up Routine will drive the fan driver to 100% for 1/4 of the programmed spin up time before reverting to the programmed spin level. SMSC EMC2305 Table 5.18 Gain Decode (continued) 0 ...
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... Revision 1.2 (03-22-10) Multiple RPM-Based PWM Fan Controller for Five Fans Table 5.21 Spin Level 0 SPIN UP DRIVE LEVEL Table 5.22. Table 5.22 Spin Time 0 TOTAL SPIN UP TIME DATASHEET Datasheet 30% 35% 40% 45% 50% 55% 60% (default) 65% 250 ms 500 ms (default) 1 sec 2 sec SMSC EMC2305 ...
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... Algorithm or by manual settings) exceeds the current fan drive setting by greater than the Fan Step Register setting, the EMC2305 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 ...
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... DATASHEET Datasheet DEFAULT Section 5.17 DEFAULT 128 64 32 F5h 128 64 32 F5h 128 64 32 F5h 128 64 32 F5h 128 64 32 F5h Equation [2] in Section 5.18 SMSC EMC2305 66h (40%) 66h (40%) ...
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... If the measured fan speed does not exceed the target fan speed minus the Fan Drive Fail Band Register settings for a period of time longer than set by the DRIVE_FAIL_CNTx[1:0] bits, then the DRIVE_FAIL status bit will be set and an interrupt generated. SMSC EMC2305 B7 B6 ...
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... DATASHEET Datasheet DEFAULT - - - F8h 128 64 32 FFh - - - F8h 128 64 32 FFh - - - F8h 128 64 32 FFh - - - F8h 128 64 32 FFh - - - F8h 128 64 32 FFh DEFAULT 128 64 32 FFh - - - F8h 128 64 32 FFh SMSC EMC2305 ...
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... Whenever the high byte register is read, the corresponding low byte data will be loaded to internal shadow registers so that when the low byte is read, the data will always coincide with the previously read high byte × RPM ------------------- - --------------------------------- - = ( ) poles COUNT 3,932,160 m RPM ------------------------------------- - = COUNT SMSC EMC2305 4096 2048 1024 512 256 ...
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... Multiple RPM-Based PWM Fan Controller for Five Fans Table 5.29 Software Lock Register Table 5.30 Product Features Register ADR[2:0] Table 5.31 ADDR_SEL Pin Configuration DATASHEET Datasheet LOCK DEFAULT FAN_SPD [2:0] 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) SMSC EMC2305 DEFAULT 00h 00h ...
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... REGISTER 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 EMC2305 Table 5.32 FAN_SPD Pin Configuration Table 5.33 Product ID Register ...
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... 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 2.95 100 150 50 DATASHEET Datasheet Supply Current vs. Supply Voltage 3.05 3.15 3.25 3.35 3.45 3.55 3.65 Supply Voltage (V) Supply Voltage (V) 3.05 3.15 3.25 3.35 3.45 3.55 3.65 Supply Voltage (V) SMSC EMC2305 ...
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... 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 EMC2305 27000 26800 26600 26400 26200 26000 25800 25600 25400 25200 25000 2 ...
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... Chapter 7 Package Drawing 7.1 EMC2305 Package Information Figure 7.1 Package Drawing - 16-Pin QFN 4mm x 4mm Revision 1.2 (03-22-10) Multiple RPM-Based PWM Fan Controller for Five Fans 52 DATASHEET Datasheet SMSC EMC2305 ...
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... Multiple RPM-Based PWM Fan Controller for Five Fans Datasheet Figure 7.2 Package Dimensions - 16-Pin QFN 4mm x 4mm Figure 7.3 PCB Footprint - 16-Pin QFN 4mm x 4mm SMSC EMC2305 53 DATASHEET Revision 1.2 (03-22-10) ...
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... 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 EMC2305 Package Markings Revision 1.2 (03-22-10) Multiple RPM-Based PWM Fan Controller for Five Fans TOP ...
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... 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 EMC2305 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 55 ...