EMC1422-1-ACZL-TR SMSC, EMC1422-1-ACZL-TR Datasheet
EMC1422-1-ACZL-TR
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EMC1422-1-ACZL-TR Summary of contents
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... PRODUCT FEATURES General Description The EMC1422 is a high accuracy, low cost, System Management Bus (SMBus) temperature sensor. Advanced features such as Resistance Error Correction (REC), Beta Compensation (to support CPU diodes requiring the BJT/transistor model including 45nm, 65nm and 90nm processors) and automatic diode type detection combine to provide a robust solution for complex environmental monitoring applications ...
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... EMC1422-1-ACZL-TR FOR 8-PIN, MSOP LEAD-FREE ROHS COMPLIANT PACKAGE Note: See Table 1.1, "Part Selection" 80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123 Copyright © 2009 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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... Conversion Rate Register 6.6 Limit Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 6.7 Scratchpad Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 6.8 Therm Limit Registers 6.9 External Diode Fault Register 6.10 Software Thermal Shutdown Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 6.11 Hardware Thermal Shutdown Limit Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 6.12 Channel Mask Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 SMSC EMC1422 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3 DATASHEET Revision 1.36 (07-02-09) ...
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... Filter Control Register 6.18 Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 6.19 SMSC ID Register (FEh 6.20 Revision Register (FFh Chapter 7 Typical Operating Curves Chapter 8 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 8.1 Package Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Chapter 9 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Revision 1.36 (07-02-09) 1°C Temperature Sensor with Hardware Thermal Shutdown 4 DATASHEET Datasheet SMSC EMC1422 ...
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... Datasheet List of Figures Figure 2.1 EMC1422 Pin Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 4.1 SMBus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 5.1 System Diagram for EMC1422 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Figure 5.2 Block Diagram of Hardware Thermal Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Figure 5.3 Isolating ALERT and SYS_SHDN Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Figure 5.4 Temperature Filter Step Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Figure 5.5 Temperature Filter Impulse Response Figure 5 ...
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... Table 4.3 Read Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 4.4 Send Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 4.5 Receive Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 4.6 Alert Response Address Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 5.1 Supply Current vs. Conversion Rate for EMC1422 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Table 5.2 SYS_SHDN Threshold Temperature Table 5.3 Temperature Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Table 6.1 Register Set in Hexadecimal Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Table 6 ...
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... Datasheet Chapter 1 Block Diagram EMC1422 Switching Current Analog ΔΣ ADC Mux DP1 DN1 Internal Temp Diode 1.1 Part Selection The EMC1422 device configuration is highlighted below. PART SMBUS EXTERNAL NUMBER ADDRESS DIODES EMC1422 - 1 1001_100xb 1 SMSC EMC1422 V DD Conversion Rate Register External ...
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... SMDATA ALERT 4 5 GND Figure 2.1 EMC1422 Pin Diagram Table 2.1 EMC1422 Pin Description FUNCTION Power supply External diode positive (anode) connection External diode negative (cathode) connection Active low System Shutdown output signal - requires pull-up resistor which selects the Hardware ...
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... DC output. If this possibility exists suggested that a clamp circuit be used. Note 3.1 For the 5V tolerant pins that have a pull-up resistor (SMCLK, SMDATA, SYS_SHDN, and ALERT), the pull-up voltage must not exceed 3.6V when the device is unpowered. SMSC EMC1422 Table 3.1 Absolute Maximum Ratings ) - V |) (see Note 3 ...
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... A +20°C < T < +110°C DIODE 0°C < T < 100°C A -40°C < T < 127°C DIODE EMC1422, default settings Connected across external diode I = 8mA SINK ALERT and SYS_SHDN pins Device powered or unpowered T < 85°C A pull-up voltage < 3.6V Temp selection read Note 3 ...
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... HD:DAT Data Setup Time t SU:DAT 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 EMC1422 = 27°C unless otherwise noted. A MIN TYP MAX UNITS SMBus Interface 2 Tolerant DD -0.3 0 Tolerant ±5 uA Powered or unpowered TA < ...
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... Chapter 4 System Management Bus Interface Protocol 4.1 System Management Bus Interface Protocol The EMC1422 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 For the first 15ms after power-up the device may not respond to SMBus communications ...
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... All devices with active interrupts will respond with their client address as shown in Table 4.6 Alert Response Address Protocol ALERT RESPONSE START ADDRESS 1 -> 0 0001_100 SMSC EMC1422 Table 4.3 Read Byte Protocol ACK START SLAVE ADDRESS XXh 0 1 -> 0 1001_100 Table 4 ...
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... Note: Other addresses are available. Contact SMSC for more information. 4.8 SMBus Timeout The EMC1422 supports SMBus Timeout. If the clock line is held low for longer than 30ms, the device will reset its SMBus protocol. This function can be enabled by setting the TIMEOUT bit in the Consecutive Alert Register (see Revision 1.36 (07-02-09) 1° ...
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... EMC1422 and using that data to control the speed of one or more fans. The EMC1422 has two levels of monitoring. The first provides a maskable ALERT signal to the host when measured temperatures meet or exceed user programmable limits. This allows the EMC1422 to be used as an independent thermal watchdog to warn the host of temperature hot spots without direct control by the host ...
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... When enabled, the dynamic averaging will affect the average supply current based on the chosen conversion rate as shown in Table 5.1 Supply Current vs. Conversion Rate for EMC1422 CONVERSION RATE (DEFAULT sec ...
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... ALERT Output The ALERT pin is an open drain output and requires a pull-up resistor to V operation: interrupt mode and comparator Mode. The mode of the ALERT output is selected via the ALERT / COMP bit in the Configuration Register (see SMSC EMC1422 Hardware Thermal Shutdown Software Conversion ...
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... One method of isolating this pin is shown in VDD 1 DP1 2 DN1 3 SYS_SHDN 4 Figure 5.3 Isolating ALERT and SYS_SHDN Pins Revision 1.36 (07-02-09) 1°C Temperature Sensor with Hardware Thermal Shutdown Figure 5.3. +3.3V 4.7K - 33K 10 SMCLK 9 SMDATA 8 ALERT 7 GND 18 DATASHEET Datasheet +2 22K Shared Alert/ SMSC EMC1422 ...
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... Diode Faults The EMC1422 detects an open on the DP and DN pins, and a short across the DP and DN pins. For each temperature measurement made, the device checks for a diode fault on the external diode channel(s). When a diode fault is detected, the ALERT pin asserts (unless masked, see and the temperature data reads 00h in the MSB and LSB registers (note: the low limit will not be checked) ...
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... This filter can be configured as Level 1, Level 2, or Disabled. The typical filter performance is shown in 90 Disabled Figure 5.4 Temperature Filter Step Response Revision 1.36 (07-02-09) 1°C Temperature Sensor with Hardware Thermal Shutdown Figure 5.4 Filter Step Response Level1 Level2 Samples 20 DATASHEET Datasheet and Figure 5. SMSC EMC1422 ...
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... Figure 5.6 shows a block diagram of the temperature measurement circuit. The negative terminal for the remote temperature diode, DN, is internally biased with a forward diode voltage referenced to ground. SMSC EMC1422 Filter Impulse Response Disabled Level1 Samples where: ⎛ ⎞ Boltzmann’s constant I ⎜ ...
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... All other bits of the low byte register are set to zero. The EMC1422 has two selectable temperature ranges. The default range is from 0°C to +127°C and the temperature is represented as binary number able to report a temperature from 0°C to +127.875°C in 0.125° ...
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... For the default range, all temperatures > +127.875°C will be reported as +127.875°C. Note 5.4 For the extended range, all temperatures > +191.875°C will be reported as +191.875°C. 5.12 External Diode Connections The EMC1422 is hard-wired to measure a specific kind of thermal diode and none of the measurement options can be changed by software ...
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... Controls the conversion rate for updating temperature data (mirrored at address 04h) 24 DATASHEET Datasheet DEFAULT VALUE PAGE 00h Page 26 00h 00h Page 26 00h Page 27 06h Page 28 (4/sec) 55h (85°C) 00h (0°C) Page 28 55h (85°C) 00h (0°C) 00h Page 27 06h Page 28 (4/sec) SMSC EMC1422 ...
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... R-C High Limit Status 36h R-C Low Limit Status 37h R THERM Limit Status SMSC EMC1422 FUNCTION Stores the 8-bit high limit for the Internal Diode (mirrored at address 05h) Stores the 8-bit low limit for the Internal Diode (mirrored at address 06h) Stores the integer portion of the ...
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... Section 6.16. The individual Status Register bits are cleared when the 26 DATASHEET Datasheet DEFAULT VALUE PAGE 00h Page 34 Table 6.21 Page 35 5Dh Page 35 01h Page DEFAULT 00h - - - - 00h 00h - - - - 00h DEFAULT FAULT THERM HWSD 00h Section SMSC EMC1422 6.9, ...
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... The dynamic averaging feature is disabled. All temperature channels will be converted with a maximum averaging factor of 1x (equivalent to 11-bit conversion). For higher conversion rates, this averaging factor will be reduced as shown in SMSC EMC1422 Table 6.4 Configuration Register B6 B5 ...
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... Temperature Sensor with Hardware Thermal Shutdown Table 6.5 Conversion Rate Register Table 6.6 Conversion Rate All others Table 6.7 Temperature Limit Registers 128 128 DATASHEET Datasheet DEFAULT 06h CONV[3:0] (4/sec) Table 6.6. 0 CONVERSIONS / SECOND (default DEFAULT 55h (85°C) 00h (0°C) SMSC EMC1422 ...
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... The Scratchpad Registers are Read Write registers that are used for place holders to be software compatible with legacy programs. Reading from the registers will return what is written to them. 6.8 Therm Limit Registers ADDR. R/W REGISTER External 19h R/W Diode THERM Limit Internal Diode 20h R/W THERM Limit SMSC EMC1422 128 0.5 0.25 0.125 - - ...
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... THERM Limit minus the THERM Hysteresis. Revision 1.36 (07-02-09) 1°C Temperature Sensor with Hardware Thermal Shutdown Table 6.9 Therm Limit Registers (continued 128 Table 6.10 External Diode Fault Register DATASHEET Datasheet DEFAULT 0Ah (10° DEFAULT - - FLT - EXTSYS INTSYS SMSC EMC1422 00h DEFAULT 00h ...
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... The Internal Diode channel will cause the ALERT pin to be asserted out of limit. ‘1’ - The Internal Diode channel will not cause the ALERT pin to be asserted out of limit. 6.13 Consecutive ALERT Register ADDR. R/W REGISTER Consecutive 22h R/W ALERT SMSC EMC1422 128 Table 6.13 Channel Mask Register B6 ...
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... The bits are decoded as shown in consecutive out of limit conversion. Revision 1.36 (07-02-09) 1°C Temperature Sensor with Hardware Thermal Shutdown Table 6.15. The default setting is 4 consecutive out of limit Table 32 DATASHEET Datasheet 6.15. The default setting is 1 SMSC EMC1422 ...
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... If any of these bits are set, then the LOW status bit in the Status Register is set. Reading from the Low Limit Status Register will clear all bits. Reading from the register will also clear the LOW status bit in the Status Register. SMSC EMC1422 NUMBER OF CONSECUTIVE OUT OF LIMIT 0 ...
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... Table 6.18 THERM Limit Status Register Table 6.19 Filter Configuration Register Table 6.20. See Figure Table 6.20 Filter Settings 0 0 Disabled (default) 1 Level 1 0 Level 1 34 DATASHEET Datasheet DEFAULT - ETHERM ITHERM DEFAULT - - FILTER[1:0] 00h 5.4and Figure 5.5 for examples on the AVERAGING SMSC EMC1422 00h ...
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... SMSC ID Register (FEh) ADDR. R/W REGISTER FEh R SMSC ID The Manufacturer ID register contains an 8 bit word that identifies the SMSC as the manufacturer of the EMC1422. 6.20 Revision Register (FFh) ADDR. R/W REGISTER FFh R Revision The Revision register contains an 8 bit word that identifies the die revision. ...
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... Typical 65nm CPU from major vendor (TA = 27°C, VDD = 3.3V, BETA = 011 110 125 36 DATASHEET Datasheet = 42.5°C, VDD = 3.3V) DIODE 110 125 Am bient Tem perature (°C) = 470pF) FILT ER Beta Compensation Disabled Beta Compensation Enabled 60 80 100 120 CPU Temperature (°C) SMSC EMC1422 ...
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... Temperature Sensor with Hardware Thermal Shutdown Datasheet Temperature E rror vs. Series R esistance 1.0 0.8 REC Disabled 0.6 0.4 0.2 REC Enabled 0 100 150 Series R (Ohm) SMSC EMC1422 Supply Current vs. Conversion Rate 120 1200 100 1100 1000 80 900 60 800 700 40 600 20 500 ...
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Chapter 8 Package Information 3 D PIN 1 IDENTIFIER AREA (D/2 X E1/ TOP VIEW C SEATING PLANE A1 ccc C SIDE VIEW C GAUGE PLANE 0.25 SEATING PLANE 0° - 8° DETAIL ...
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... Package Markings All devices will be marked on the first line of the top side with ”1422”. On the second line, they will be marked with the appropriate -X number (-1, -2, etc), the Functional Revision “B” and Country Code (CC). . SMSC EMC1422 39 DATASHEET Revision 1.36 (07-02-09) ...
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... Table 2.1, "EMC1422 Pin Description" Table 3.1, "Absolute Maximum Ratings" Table 3.2, "Electrical Specifications" Rev. 1.35 Table 2.1, "EMC1422 Pin Description" (04-17-09) Rev. 1.34 Table 5.3, "Temperature Data Format" (02-27-09) Revision 1.36 (07-02-09) 1°C Temperature Sensor with Hardware Thermal Shutdown Table 9 ...