EMC1063 1°C Triple Temperature Sensor with Hotter of Two Zones PRODUCT FEATURES Datasheet GENERAL DESCRIPTION The EMC1063 is a family of System Management Bus (SMBus) temperature sensors that monitors three temperature zones, one internal diode and two externally connected diodes. The EMC1063 is specifically designed to operate with AMD processor diodes. Alternately, the External Diode 2 channel can be configured to measure a standard thermal diode (such as a 2N3904) with Resistive Error Correction active. An added feature to the EMC1063 is a function that automatically compares the two external temperature zones and reports the hotter of the two temperatures. Selectable conversion rates and standby mode support low-power operation. The temperature measurement ranges support two data ranges (and formats), -64°C to +127°C and -64°C to +191°C. APPLICATIONS Desktop and Notebook Computers Hardware Management Servers Embedded Applications FEATURES Designed to Operate with AMD Processor Diodes Supports two External Temperature Diodes ±1°C Accuracy (40°C to 80°C) 0.125°C Resolution Ideality Factor Configuration Accepts 2200pF Cap Across External Diodes for Noise Suppression — Optional Resistive Error Correction on External Diode 2 — — — — Internal Temperature Diode — ±3°C Accuracy (0°C to 85°C) — 0.125°C Resolution Low Power Operation 3.0V to 3.6V Supply Programmable Conversion Rate SMBus 2.0 Compliant Reports Hotter of Two Diodes with Dual-core CPU — 4uA Standby Current — Four SMBus Address Available SIMPLIFIED BLOCK DIAGRAM Switching Current Configuration Register Analog Mux and Anti-Alias Filter DN1 DP2 DN2 Local Temp Diode 11-bit delta-sigma ADC External Diode 2 Register Digital Mux and Byte Interlock Internal Diode Register SMCLK Status Register SMSC EMC1063 DATASHEET SMBus Interface External Diode 1 Register DP1 SMDATA Revision 1.37 (02-05-07) 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet ORDER NUMBERS: EMC1063-1-ACZL-TR FOR 8 PIN, MSOP PACKAGE (ADDRESS - 1001100B) (LEAD-FREE ROHS COMPLIANT) EMC1063-2-ACZL-TR FOR 8 PIN, MSOP PACKAGE (ADDRESS - 1001101B) (LEAD-FREE ROHS COMPLIANT) EMC1063-3-ACZL-TR FOR 8 PIN, MSOP PACKAGE (ADDRESS - 1001000B) (LEAD-FREE ROHS COMPLIANT) EMC1063-4-ACZL-TR FOR 8 PIN, MSOP PACKAGE (ADDRESS - 1001001B) (LEAD-FREE ROHS COMPLIANT) Reel size is 4,000 pieces. Evaluation board available upon request (EVB-EMC1063) 80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123 Copyright © 2007 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. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC’s website at http://www.smsc.com. SMSC is a registered trademark of Standard Microsystems Corporation (“SMSC”). Product names and company names are the trademarks of their respective holders. SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT; TORT; NEGLIGENCE OF SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Revision 1.37 (02-05-07) 2 DATASHEET SMSC EMC1063 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet Table of Contents Chapter 1 Pin Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Chapter 2 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1 2.2 2.3 2.4 2.5 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 System Management Bus Interface Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.3.1 Write Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.3.2 Read Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.3.3 Send Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.3.4 Receive Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.3.5 SMBus Timing Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 SMBus Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 SMBus Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Chapter 3 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . One Shot During Standby Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operation During Run Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3.1 Conversion Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3.2 Dynamic Averaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Temperature Monitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Temperature Measurement Results and Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Resistance Error Correction (REC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Programmable Ideality Factor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diode Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 11 11 12 12 12 14 14 15 15 Chapter 4 Register Set and Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 Legacy Temperature Data Registers (00h, 23h, 01h, 10h, F8h, F9h) . . . . . . . . . . . . . . . . . . . . . . Extended Format Temperature Registers (FAh-FDh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Status Register - 02h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Configuration Register (03h Read, 09h Write) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Configuration 2 Register - (04h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . One Shot Register - (0Fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ideality Configuration Registers (27h - 28h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product ID Register (EDh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manufacturer ID Register (FEh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Revision Register (FFh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 18 18 18 19 20 20 21 22 22 Chapter 5 Typical Operating Curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Chapter 6 Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 6.1 Package Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 SMSC EMC1063 3 DATASHEET Revision 1.37 (02-05-07) 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet List of Figures Figure 1.1 Figure 2.1 Figure 3.1 Figure 3.2 Figure 3.3 Figure 6.1 EMC1063 Pin Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 System Management Bus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 EMC1063 Diode System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Block Diagram of Temperature Monitoring Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 External Diode Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8-Pin MSOP Package Outline - 3x3mm Body 0.65mm Pitch. . . . . . . . . . . . . . . . . . . . . . . . . 25 Revision 1.37 (02-05-07) 4 DATASHEET SMSC EMC1063 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet List of Tables Table 1.1 EMC1063 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Table 2.1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 2.2 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 2.3 Write Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Table 2.4 Read Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Table 2.5 Send Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 2.6 Receive Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 3.1 Supply Current vs. Conversion Rate and ADC Averaging Factor . . . . . . . . . . . . . . . . . . . . . . 12 Table 3.2 EMC1063 Temperature Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 4.1 EMC1063 Register Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Table 4.2 Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Table 4.3 Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Table 4.4 Conversion Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 4.5 Configuration 2 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 4.6 One Shot Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Table 4.7 Ideality Configuration Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Table 4.8 Ideality Factor Look Up Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Table 4.9 Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Table 4.10 Manufacturer ID Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Table 4.11 Revision Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Table 6.1 8-Pin MSOP Package Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 SMSC EMC1063 5 DATASHEET Revision 1.37 (02-05-07) 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet Chapter 1 Pin Function DP1 1 DN1 2 DP2 3 DN2 4 8-MSOP 8 SMCLK 7 SMDATA 6 VDD 5 GND Figure 1.1 EMC1063 Pin Diagram Table 1.1 EMC1063 Pin Description PIN PIN NO. DP1 1 External Diode 1 Positive (anode) Connection DN1 2 External Diode 1 Negative (cathode) Connection DP2 3 External Diode 2 Positive (anode) Connection DN2 4 External Diode 2 Negative (cathode) Connection GND 5 Ground VDD 6 Supply Voltage SMDATA 7 System Management Bus Data - bi-directional data, open drain output SMCLK 8 System Management Bus Clock Input Revision 1.37 (02-05-07) DESCRIPTION 6 DATASHEET SMSC EMC1063 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet Chapter 2 Electrical Specifications 2.1 Absolute Maximum Ratings Table 2.1 Absolute Maximum Ratings DESCRIPTION RATING UNIT Supply Voltage VDD -0.3 to 5.0 V Voltage on SMDATA and SMCLK pins -0.3 to 5.5 V -0.3 to VDD+0.3 V Operating Temperature Range -40 to 125 °C Storage Temperature Range -55 to 150 °C Voltage on any other pin Lead Temperature Range Refer to JEDEC Spec. J-STD-020 Package Thermal Characteristics for MSOP-8 Thermal Resistance TJA(at 0 air flow) ESD Rating, All Pins Human Body Model 135.9 °C/W 2000 V Note: Stresses above those listed could cause damage to the device. This is a stress rating only and functional operation of the device at any other condition above those indicated in the operation sections of this specification is not implied. When powering this device from laboratory or system power supplies, it is important that the Absolute Maximum Ratings not be exceeded or device failure can result. Some power supplies exhibit voltage spikes on their outputs when the AC power is switched on or off. In addition, voltage transients on the AC power line may appear on the DC output. If this possibility exists, it is suggested that a clamp circuit be used. 2.2 Electrical Specifications Table 2.2 Electrical Characteristics VDD=3.0V to 3.6V, TA= 0°C to +85°C, Typical values at TA = 27°C unless otherwise noted PARAMETER SYMBOL MIN TYP MAX UNITS CONDITIONS Supply Voltage VDD 3.0 3.3 3.6 V Average Operating Current IDD 340 400 μA 4 conversions/s See Table 4.4. ISTBY 2 4 μA Standby mode ±1 ±3 °C 0°C≤TA≤85°C DC Power Internal Temperature Monitor Temperature Accuracy Temperature Resolution SMSC EMC1063 0.125 7 DATASHEET °C Revision 1.37 (02-05-07) 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet Table 2.2 Electrical Characteristics (continued) VDD=3.0V to 3.6V, TA= 0°C to +85°C, Typical values at TA = 27°C unless otherwise noted PARAMETER SYMBOL MIN TYP MAX UNITS ±1 ±3 °C °C CONDITIONS External Temperature Monitor Temperature Accuracy Remote Diode 40°C to 80°C Remote Diode 0°C to 125°C Temperature Resolution °C 0.125 Filter Capacitor CFILTER 15°C≤TA≤70°C 0°C≤TA≤85°C 2.2 nF 5.5 V Connected across external diode Note 2.2 Voltage Tolerance Voltage at pin ( SMDATA,SMCLK) VTOL -0.3 Input High Level VIH 2.0 Input Low Level VIL SMBus Interface (SMDATA,SMCLK) Input High/Low Current IIH/IIL -1 Hysteresis Input Capacitance Output Low Sink Current V 0.8 V 1 μA 500 mV 5 pF 6 mA SMDATA = 0.6V SMBus Timing Clock Frequency FSMB 10 Spike Suppression 400 kHz 50 ns TBUF 1.3 μs Hold time Start THD:STA 0.6 μs Setup time Start TSU:STA 0.6 μs Setup time Stop TSU:STO 0.6 μs Data Hold Time THD:DAT 0.3 μs Data Setup Time TSU:DAT 100 ns Clock Low Period TLOW 1.3 μs Clock High Period THIGH 0.6 μs Clock/Data Fall Time TF * 300 ns *Min = 20+0.1Cb ns Clock/Data Rise Time TR * 300 Note 2.1 ns *Min = 20+0.1Cb ns Capacitive Load (each bus line) Cb 0.6 400 pF Bus free time Start to Stop Note 2.1 Revision 1.37 (02-05-07) 300nS rise time max is required for 400kHz bus operation. For lower clock frequencies, the maximum rise time is (0.1/FSMB)+50nS 8 DATASHEET SMSC EMC1063 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet Note 2.2 2.3 See SMSC Applications for Application Notes and Guidelines when measuring GPU processor diodes and CPU processor diodes. System Management Bus Interface Protocol A host controller, such as an SMSC I/O controller, communicates with the EMC1063 via the two wire serial interface named SMBus. The SMBus interface is used to read and write registers in the EMC1063, which is a slave-only device. A detailed timing diagram is shown in Figure 2.1. TLOW THIGH THD:STA TR SMCLK TSU:STO TF THD:STA THD:DAT TSU:DAT TSU:STA SMDATA TBUF S P S S - Start Condition P - Stop Condition P Figure 2.1 System Management Bus Timing Diagram The EMC1063 implements a subset of the SMBus specification and supports Write Byte, Read Byte, Send Byte, and Receive Byte protocols as shown. In the tables that describe the protocol, the “gray” columns indicate that the slave is driving the bus. All of the below protocols use the following convention: DATA SENT TO THE HOST DATA SENT TO DEVICE # of bits sent 2.3.1 # of bits sent Write Byte The Write Byte is used to write one byte of data to the registers as shown in Table 2.3. Table 2.3 Write Byte Protocol START SLAVE ADDRESS WR ACK COMMAND ACK DATA ACK STOP 1 7 1 1 8 1 8 1 1 2.3.2 Read Byte The Read Byte protocol is used to read one byte of data from the registers as shown in Table 2.4. Table 2.4 Read Byte Protocol START SLAVE ADDRESS WR ACK COMMAND ACK START SLAVE ADDRESS RD ACK DATA NACK STOP 1 7 1 1 8 1 1 7 1 1 8 1 1 SMSC EMC1063 9 DATASHEET Revision 1.37 (02-05-07) 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet 2.3.3 Send Byte The Send Byte protocol is used to set the Internal Address Register to the correct Address as shown in Table 2.5. The Send Byte can be followed by the Receive Byte protocol described in Table 2.6 to read data from the register. The send byte protocol cannot be used to write data - if data is to be written to a register then the write byte protocol must be used as described in Section 2.3.1. Table 2.5 Send Byte Protocol START SLAVE ADDR WR ACK REG. ADDR ACK STOP 1 7 1 1 8 1 1 2.3.4 Receive Byte The Receive Byte protocol is used to read data from a register when the internal register address pointer is known to be at the right location (e.g. set via Send Byte). This can be used for consecutive reads of the same register as shown in Table 2.6. Table 2.6 Receive Byte Protocol START SLAVE ADDR RD ACK REG. DATA NACK STOP 1 7 1 1 8 1 1 2.3.5 SMBus Timing Diagram The Timing for the SMBus is shown in Figure 2.1. 2.4 SMBus Addresses The EMC1063 may be ordered with one of four slave addresses as shown in ORDER Numbers:. Attempting to communicate with the EMC1063 SMBus interface with an invalid slave address or invalid protocol results in no response from the device and does not affect its register contents. The EMC1063 supports stretching of the SMCLK signal by other devices on the SMBus but will not perform this operation itself. 2.5 SMBus Timeout The EMC1063 includes an SMBus time-out feature. Following a 25 ms period of inactivity on the SMBus, the device will time-out and reset the SMBus interface. Revision 1.37 (02-05-07) 10 DATASHEET SMSC EMC1063 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet Chapter 3 Product Description The EMC1063 is an SMBus sensor that monitors three temperature zones for use in a personal computer or embedded environment. The part may be used as a companion to one of SMSC’s broad line of SIO host devices to perform fan control and thermal management. The EMC1063 is designed to operate with two AMD thermal diodes. The External diode 2 channel can be configured with the Resistance Error Correction feature enabled to measure a discrete 2N3904 diode. A typical system is shown in Figure 3.1. CPU EMC1063 Host DP1 Thermal diode DN1 SMBus Thermal diode SMBus Interface DP2 CPU DN2 Internal Diode Figure 3.1 EMC1063 Diode System 3.1 Power Modes The EMC1063 has two power modes. 3.2 Run Mode - In this mode, the temperature monitors are active and converting at the programmed conversion rate. The average power dissipation will depend on the conversion rate. When the EMC1063 is not actively converting a channel, it goes into a lower power wait state. Standby Mode (power-up default) - in this mode, the EMC1063 is put into a low power state. In the standby mode, temperature monitoring is disabled. The device will still respond to SMBus commands. One Shot During Standby Mode The EMC1063 supports a One-Shot command when it is in Standby Mode. Writing to the One-Shot register will cause the device to power up, perform 1 full set of temperature conversions, then return to Standby Mode. 3.3 Operation During Run Mode When the device is active, there are two modes of operation available. Normal Mode (power-up default) - In this mode of operation, the EMC1063 continuously samples and updates all of its temperature channels. Hotter of Two Mode - In this mode, the EMC1063 continuously samples and then compares the two remote zones. The hotter of the two remote zones is loaded into the External Diode 2 Data Registers. In addition, the HOTTER bit in the Status register is set or cleared to indicate which external diode zone is hotter. If the two remote zones are exactly equal to each other, then the SMSC EMC1063 11 DATASHEET Revision 1.37 (02-05-07) 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet HOTTER bit is cleared (set to ‘0’), and the results of the two remote zones are stored in their respective registers. 3.3.1 Conversion Rates The EMC1063 may be configured for different conversion rates based on the system requirements. The available rates are 1 full set of conversions per second to 16 full sets of conversions per second. The conversion rate is configured as described in Section 4.4. The available conversion rates are shown in Table 4.4. 3.3.2 Dynamic Averaging The EMC1063 temperature channels support a new feature that measures the external diode channels for an extended time based on the selected conversion rate. This functionality can be disabled as described in Section 4.5 for increased power savings at the lower conversion rates. When Dynamic Averaging is enabled, the device will automatically adjust the sampling and measurement time for both external diode channels. This allows the device to average 2x or 4x longer than the normal 11 bit operation while still maintaining the selected conversion rate. The benefits of Dynamic Averaging are improved noise rejection due to the longer integration time as well as less random variation on the temperature measurement. The Dynamic Averaging applies when a One-Shot command is issued. The device will perform the desired averaging during the one-shot operation according to the selected conversion rate. The Dynamic Averaging will affect the average supply current based on the chosen conversion rate as shown in Table 3.1. Table 3.1 Supply Current vs. Conversion Rate and ADC Averaging Factor ADC AVERAGING FACTOR 4X (MAX_RES = 1) (DA_n = 0) CONVERSION RATE 2X (MAX_RES = 0) (DA_n = 0) 1X (DA_n = 1) 1 / sec 190uA 132uA 105uA 2 / sec 315uA 205uA 150uA 4 / sec 580uA 350uA 235uA 8 / sec N/A 640uA 405uA 16 / sec N/A N/A 750uA 3.4 Temperature Monitors In general, thermal diode temperature measurements are based on the change in forward bias voltage of a diode when operated at two different currents. This ΔVBE is then proportional to absolute temperature as shown in the following equation: where: ΔVBE = VBE _ HIGH − VBE _ LOW ηkT ⎛ I HIGH ⎞ ⎟⎟ ln⎜⎜ = q I ⎝ LOW ⎠ k = Boltzmann’s constant T = absolute temperature in Kelvin [1] q = electron charge η = diode ideality factor Revision 1.37 (02-05-07) 12 DATASHEET SMSC EMC1063 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet IHIGH ILOW DP AntiAliasing Filter ΔΣ ADC DN Figure 3.2 Block Diagram of Temperature Monitoring Circuit Figure 3.2 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. The External Diode 2 channel in the EMC1063 is compatible with a broad range of thermal diode, including those found in AMD processors, that may be connected as shown in Figure 3.3. Typical remote PN Junction diode i.e. AMD temperature diode to DP to DP to DP to DN to DN to DN Typical remote discrete PNP transistor i.e. 2N3906 Typical remote discrete NPN transistor i.e. 2N3904 Figure 3.3 External Diode Configurations SMSC EMC1063 13 DATASHEET Revision 1.37 (02-05-07) 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet 3.5 Temperature Measurement Results and Data Each temperature result for each zone is available in two byte wide data registers. As shown in Section 4.1, the 11-bit format has the 8 most significant bits stored in the high byte register and the 3 least significant bits stored in the three MSB positions of the low byte register. The delta-sigma ADC may be operated with more than 11 bits of resolution for improved averaging as described in Section 4.5, but the temperature result is reported at 11-bit resolution. The temperature results for the two remote zones are also stored in extended format with a range from -64°C to +191°C. The data format is a 2’s complement number offset by 64°C as shown in Section 4.2. The data for each of the remote zones in both legacy and extended format is stored in separate data registers so that both data formats are always available. Table 3.2 shows the default and extended range formats. Table 3.2 EMC1063 Temperature Data Format RANGE -64°C TO 127°C RANGE -64°C TO 191°C BINARY OFFSET BINARY TEMPERATURE (°C) Diode Fault 100 0000 0000 100 0000 0000 <= -64 110 0000 0000 100 0000 0000 -63.875 110 0000 0001 100 0000 0001 -63 110 0000 1000 100 0000 1000 -1 111 1111 1000 101 1111 1000 0 000 0000 0000 110 0000 0000 0.125 000 0000 0001 110 0000 0001 1 000 0000 1000 110 0000 1000 64 010 0000 0000 000 0000 0000 65 010 0000 1000 000 0000 1000 127 011 1111 1000 001 1111 1000 127.875 011 1111 1111 001 1111 1111 128 011 1111 1111 010 0000 0000 191 011 1111 1111 011 1111 1000 >= 191.875 011 1111 1111 011 1111 1111 3.6 Resistance Error Correction (REC) Resistance error correction is an optional feature in the EMC1063 that eliminates the need to characterize and compensate for series resistance in the External Diode 2 lines. The EMC1063 corrects for as much as 100 ohms of series resistance. When using a temperature sensor that does not include resistance error correction, voltage developed across the parasitic resistance in the external diode path produces an error in the reported temperature. The error introduced by this resistance is approximately +0.7°C per ohm. Sources of series resistance are PCB trace resistance, on die (i.e. on the processor) metal resistance, bulk resistance in the base and emitter of the temperature transistor. Revision 1.37 (02-05-07) 14 DATASHEET SMSC EMC1063 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet The External Diode 1 channel has the REC functionality disabled for use in monitoring an AMD K8 processor. The External Diode 2 channel defaults to REC functionality disabled but can be enabled by writing to the Configuration 2 Register (see Section 4.5). If the External Diode 2 channel is connected as a diode-connected transistor as shown in Figure 3.3, resistance error correction should be enabled to minimize series resistance and improve accuracy 3.7 Programmable Ideality Factor The EMC1063 default is for a diode ideality factor of 1.008 which is common for a 2N3904 diode and for many processor transistors. When a diode or transistor is used that has a different ideality factor value than 1.008 a temperature error is induced that is a linear function of temperature. Previous solutions for this mismatch in ideality factor has been to supply a programmable offset to the temperature reading which corrects the error at a single temperature but causes a residual error at all other temperatures. The EMC1063 ideality factor register corrects this mismatch error at all temperatures (see Section 4.7). APPLICATION NOTE: When monitoring a substrate transistor or CPU diode and beta compensation is enabled, the Ideality Factor should not be adjusted. Beta Compensation automatically corrects for most ideality errors. 3.8 Diode Faults The EMC1063 detects a fault if the DP pin is left floating or is shorted to VDD. In the case of a diode fault, the corresponding status bit will be set and the output data will be set at 400h. SMSC EMC1063 15 DATASHEET Revision 1.37 (02-05-07) SMSC EMC1063 Chapter 4 Register Set and Description The following registers are accessible through the SMBus Interface. Table 4.1 EMC1063 Register Set REGISTER ADDRESS 16 DATASHEET R/W REGISTER NAME SYMBOL B7 B6 B5 00h N/A R Internal Temperature High Byte - Legacy Format INTHBL Sign 64 32 23h N/A R Internal Temperature Low Byte - Legacy Format INTLBL 0.5 0.25 0.125 01h N/A R External Diode 1 High Byte - Legacy Format ET1HBL Sign 64 32 10h N/A R External Diode 1 Low Byte - Legacy Format ET1LBL 0.5 0.25 0.125 F8h N/A R External Diode 2 High Byte - Legacy Format ET2HBL Sign 64 32 F9h N/A R External Diode 2 Low Byte - Legacy Format ET2LBL 0.5 0.25 0.125 FAh N/A R External Diode 1 High Byte - Extended Format ET1HBE 128 64 32 FBh N/A R External Diode 1 Low Byte - Extended Format ET1LBE 0.5 0.25 0.125 FCh N/A R External Diode 2 HIgh Byte - Extended Format ET2HBE 128 64 32 B4 16 B3 8 B2 4 B1 2 B0 1 DEFAULT VALUE 00h 00h 16 8 4 2 1 00h 00h 16 8 4 2 1 00h 00h 16 8 4 2 1 00h 00h 16 8 4 2 1 00h 1°C Triple Temperature Sensor with Hotter of Two Zones WRITE Datasheet Revision 1.37 (02-05-07) READ REGISTER ADDRESS READ WRITE FDh N/A R/W R REGISTER NAME External Diode 2 Low Byte - Extended Format SYMBOL ET2LBE B7 0.5 B6 0.25 B5 B4 B3 B2 B1 B0 0.125 DEFAULT VALUE 00h Status and Control 17 DATASHEET 02h N/A R Status STS Busy - - HOTT ER - - 03h 09h R/W Configuration CFG - ADC_ST OP - - - CR<2:0> 04h 04h R/W Configuration 2 CFG2 - - - - MAX_ RES DA_n N/A 0Fh W One Shot Conversion Shot D2 D1 00h 45h COMP REC 08h One Shot The data written to this register is irrelevant and will not be stored 00h Ideality 27h 27h R/W External Diode 1 Ideality Correction Factor IDCF1 - - B5 B4 B3 B2 B1 B0 12h (1.008) 28h 28h R/W External Diode 2 Ideality Correction Factor IDCF2 - - B5 B4 B3 B2 B1 B0 12h (1.008) 0 0 1 1 0 0 0 0 30h (-1) 0 0 1 1 0 0 0 1 31h (-1) 0 0 1 1 0 0 1 0 32h (-3) 0 0 1 1 0 0 1 1 33h (-4) EDh EDh R Product ID PID SMSC EMC1063 FEh FEh R Manufacturer ID SMSC 0 1 0 1 1 1 0 1 5Dh FFh FFh R Revision Register REV - - - - 0 0 0 1 01h 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet Revision 1.37 (02-05-07) Table 4.1 EMC1063 Register Set (continued) 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet During Power on Reset (POR), the default values are stored in the registers. A POR is initiated when power is first applied to the part and the voltage on the VDD supply surpasses the POR level as specified in the electrical characteristics. Any reads to undefined registers will return 00h. Writes to undefined registers will not have an effect. The EMC1063 uses an interlock mechanism that will update the Low byte of a particular monitor when the High Byte is read. This prevents changes in register content when the ADC updates between successive reads. 4.1 Legacy Temperature Data Registers (00h, 23h, 01h, 10h, F8h, F9h) As shown in Table 4.1, each temperature monitor has two data registers. The 11 bit temperature data is stored aligned to the left resulting in the High Byte containing temperature in 1°C steps and the Low Byte containing fractions of a degree. 4.2 Extended Format Temperature Registers (FAh-FDh) The Extended Format Temperature Registers store only the external diode temperatures in the extended data format. This is because, due to the operating range limitations of the EMC1063, the internal temperature could not benefit from the extended temperature range. Like the Legacy data formatting, the data is stored in two registers per temperature channel. 4.3 Status Register - 02h Table 4.2 Status Register ADDR 02h REGISTER Status B7 Busy B6 B5 - B4 - B3 HOTTER - B2 - B1 D2 B0 D1 DEFAULT 00h The Status Register is a read only register and returns the operational status of the part. External diode faults are indicated by bits 1 and 0. If either bit is set to ‘1’, then a diode fault has occurred. When a diode fault occurs, the D1 or D2 status bit is set, but otherwise the data remains unchanged. Bit 7 - Busy - indicates that the ADC is currently converting a temperature. Bit 4 - HOTTER - during Hotter of Two mode, this bit indicates which of the external diode channels is hotter. If this bit is ‘0’, then External Diode 1 is hotter or equal to External Diode 2. If this bit is ‘1’, then External Diode 2 is hotter than External Diode 1. During normal operation, this bit will always read a ‘0’. Bit 1 - D2 - indicates that a diode fault has occurred on External Diode 2. Bit 0 - D1 - indicates that a diode fault has occurred on External Diode 1. 4.4 Configuration Register (03h Read, 09h Write) Table 4.3 Configuration Register ADDR 03h Read, 09h Write REGISTER Config Revision 1.37 (02-05-07) B7 - B6 STANDBY B5 - B4 - 18 B3 - DATASHEET B2 CR<2:0> B1 B0 DEFAULT 45h SMSC EMC1063 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet The Configuration Register controls the basic functionality of the EMC1063. The bits are described below: Bit 6 - STANDBY- controls the ADC conversions and power modes of the part. '0' - The device is in the run operating mode. The ADC is converting at the user-programmed conversion rate. '1' - (default) The device is in the standby operating mode (see Section 3.1). Bit 2-0 - CR<2:0> - determines the conversion rate for the temperature monitoring per Table 4.4. Table 4.4 Conversion Rate CR<2:0> 2 1 CONVERSIONS / SECOND (CONVERSION TIME) 0 0 0 0 Reserved 0 0 1 Reserved 0 1 0 Reserved 0 1 1 1 Conversion / sec 1 0 0 2 Conversions / sec 1 0 1 4 Conversions / sec (default) 1 1 0 8 Conversions / sec 1 1 1 16 Conversions / sec 4.5 Configuration 2 Register - (04h) Table 4.5 Configuration 2 Register ADDR 04h REGISTER CFG2 B7 - B6 - B5 - B4 - B3 MAX_RES B2 B1 B0 DA_n COMP REC DEFAULT 08h The Configuration 2 Register controls the basic functionality of the EMC1063 that is NOT compatible with the EMC1023. Bit 3 - MAX_RES - controls the external diode conversion time during dynamic averaging. Although the dynamic averaging may be used to increase the ADC resolution, only 11 bits of data are available in the temperature registers. ‘0’ - the dynamic averaging will set the ADC averaging factor at 1x when the conversion rate is set at 16 conversions per second and 2x at conversion rates lower than 16 per second. ‘1’ (default) - the dynamic averaging will set the ADC averaging factor at 1x when the conversion rate is set at 16 conversions per second, 2x at 8 conversions / second and 4x at conversion rates lower than 8 per second. Bit 2 - DA_n - controls the dynamic digital averaging circuitry. See Section 3.3.2. SMSC EMC1063 ‘0’ (default) - dynamic averaging is enabled. Depending on the selected conversion rate, the ADC averaging factor is increased for the external diodes. 19 DATASHEET Revision 1.37 (02-05-07) 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet ‘1’ - dynamic averaging is disabled. The ADC averaging factor will remain fixed at 1x for all conversion rates and will allow increased power savings at the slower conversion rates. Bit 1 - COMP - configures the device to perform a comparison for the Hotter of Two mode (see Section 3.3, "Operation During Run Mode," on page 11.) ‘0’ (default) - the device is in normal mode ‘1’ - the device is in Hotter of Two mode. In this mode, the two external diode channels are measured and compared against each other. The hotter of the two channels has its data loaded into the External Diode 2 Data Registers. The Internal Diode and External Diode 1 Data Registers remain unaffected. Bit 0 - REC - controls the Resistance Error Correction circuitry 4.6 '0' - (default) - The Resistance Error Correction circuitry is disabled. '1' - The Resistance Error Correction circuitry is active and will automatically correct for up to 100 ohms of series resistance in the diode lines for the External Diode 2channel. One Shot Register - (0Fh) Table 4.6 One Shot Registers ADDR 0Fh REGISTER One Shot Conversion B7 B6 B5 B4 B3 B2 B1 B0 Writing to this register address initiates the one-shot. The data is not important and is not stored DEFAULT 00h The One Shot Register is an address place holder for the one-shot command. Writing to the address initiates the command. The data written is not important and is not stored. Reading from the one-shot registers will always return 00h. 4.7 Ideality Configuration Registers (27h - 28h) Table 4.7 Ideality Configuration Registers ADDR REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 27h Diode 1 Ideality Correction Factor - - B5 B4 B3 B2 B1 B0 12h (1.008) 28h Diode 2 Ideality Correction Factor - - B5 B4 B3 B2 B1 B0 12h (1.008) The Ideality Configuration Registers store the ideality correction factor that is applied to each external diode. The table below shows the ideality factor settings for the Ideality Configuration registers. Shading indicates power-up default. All codes that are not listed are reserved and should not be used. Beta Compensation and Resistance Error Correction automatically correct for most diode ideality errors, therefore it is not recommended that these settings be updated without consulting SMSC. Revision 1.37 (02-05-07) 20 DATASHEET SMSC EMC1063 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet Table 4.8 Ideality Factor Look Up Table SETTING FACTOR SETTING FACTOR SETTING FACTOR 001000 0.9951 011000 1.0159 101000 1.0377 001001 0.9964 011001 1.0173 101001 1.0391 001010 0.9976 011010 1.0186 101010 1.0404 001011 0.9989 011011 1.0199 101011 1.0418 001100 1.0002 011100 1.0213 101100 1.0432 001101 1.0015 011101 1.0226 101101 1.0446 001110 1.0028 011110 1.0240 101110 1.0460 001111 1.0041 011111 1.0253 101111 1.0475 010000 1.0054 100000 1.0267 110000 1.0489 010001 1.0067 100001 1.0280 110001 1.0503 010010 1.0080 100010 1.0294 010011 1.0093 100011 1.0308 010100 1.0106 100100 1.0321 010101 1.0119 100101 1.0335 010110 1.0133 100110 1.0349 010111 1.0146 100111 1.0363 4.8 Product ID Register (EDh) Table 4.9 Product ID Register ADDR EDh REGISTER PID B7 0 B6 0 B5 1 B4 1 B3 0 B2 0 B1 X B0 X DEFAULT 30 31 32 33 (-1) (-2) (-3) (-4) The Product ID Register holds the unique product ID for identifying SMSC EMC products. See Table 4.1 for a list of the product ID number for each version of the EMC1063. SMSC EMC1063 21 DATASHEET Revision 1.37 (02-05-07) 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet 4.9 Manufacturer ID Register (FEh) Table 4.10 Manufacturer ID Register ADDR FEh REGISTER SMSC B7 0 B6 1 B5 0 B4 1 B3 B2 1 1 B1 0 B0 1 DEFAULT 5Dh The Manufacturer ID register contains an 8 bit word that identifies the manufacturer of the EMC1063 (SMSC = 5Dh). 4.10 Revision Register (FFh) Table 4.11 Revision Register ADDR FFh REGISTER REV B7 - B6 - B5 - B4 - B3 0 B2 0 B1 0 B0 1 DEFAULT 01h The Revision register contains a 4 bit word that identifies the die revision. Revision 1.37 (02-05-07) 22 DATASHEET SMSC EMC1063 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet Chapter 5 Typical Operating Curves Temperature Error vs. Filter Capacitor (2N3904, TA = 27°C, TDIODE = 27°C, VDD = 3.3V) Supply Curre nt vs. Conve rsion Ra te (TA = 27°C, VDD = 3.3V) 800 0.5 Temperature Error (°C) Supply Current (uA) 700 600 500 400 300 200 100 0.3 0.0 -0.3 -0.5 -0.8 -1.0 0 0 1 2 4 8 16 1000 2000 3000 4000 Filter Capacitor (pF) Conve rsion Rate (conv / se c) Temperature Error vs. External Diode Temperature (2N3904, TA=42.5°C, VDD = 3.3V) 2.0 2.0 1.5 1.5 Temperature Error (°C) Temperature Error (°C) Temperature Error vs. Ambient Temperature (2N3904, TDIODE = 27°C, VDD = 3.3V) 1.0 0.5 0.0 -0.5 -1.0 1.0 0.5 0.0 -0.5 -1.0 -1.5 -1.5 -2.0 -2.0 0 15 SMSC EMC1063 30 45 60 Ambient Temperature (°C) 75 0 90 23 DATASHEET 25 50 75 100 External Diode Temperature (°C) 125 Revision 1.37 (02-05-07) 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet Te m pe rature Error vs . Le ak age Re s is tance (2N3904, TA = T DIODE = 27°C, V DD = 3.3V ) 30.0 Standby Current vs. Supply Voltage (TA = 27°C) 3.0 DP to GND Standby Current (uA) Tem perature Error(°C) 20.0 10.0 0.0 -10.0 -20.0 -30.0 DP to VDD -40.0 2.5 2.0 1.5 1.0 0.5 0.0 1 10 2.9 100 Revision 1.37 (02-05-07) 3.1 3.3 3.5 3.7 Supply Voltage (V) Le ak age Re s is tance (M Ω ) 24 DATASHEET SMSC EMC1063 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet Chapter 6 Package Outline Figure 6.1 8-Pin MSOP Package Outline - 3x3mm Body 0.65mm Pitch Table 6.1 8-Pin MSOP Package Parameters MIN NOMINAL MAX REMARKS A 0.80 ~ 1.10 Overall Package Height A1 0.05 ~ 0.15 Standoff A2 0.75 0.85 0.95 Body Thickness D 2.80 3.00 3.20 X Body Size E 4.65 4.90 5.15 Y Span E1 2.80 ~ 3.20 Y body Size H 0.08 ~ 0.23 Lead Foot Thickness L 0.40 ~ 0.80 Lead Foot Length L1 0.95 REF e Lead Length 0.65 BSC Lead Pitch θ 0o W 0.22 ~ 0.38 Lead Width ccc ~ ~ 0.10 Coplanarity ~ 8o Lead Foot Angle Notes: 1. Controlling Unit: millimeters. 2. Tolerance on the true position of the leads is ± 0.065 mm maximum. 3. Package body dimensions D and E1 do not include mold protrusion or flash. Dimensions D and E1 to be determined at datum plane H. Maximum mold protrusion or flash is 0.15mm (0.006 inches) per end, and 0.15mm (0.006 inches) per side. 4. Dimension for foot length L measured at the gauge plane 0.25 mm above the seating plane. 5. Details of pin 1 identifier are optional but must be located within the zone indicated. SMSC EMC1063 25 DATASHEET Revision 1.37 (02-05-07) 1°C Triple Temperature Sensor with Hotter of Two Zones Datasheet 6.1 Package Markings All devices will be marked on the first line of the top side with ”1063”. On the second line, they will be marked with version (V), revision (R) and country of origin (CC) resulting in a four letter code of (VRCC). Revision 1.37 (02-05-07) 26 DATASHEET SMSC EMC1063