BBUS Compliant Dual Temperature Monitor

EMC1212 BBUS Compliant Dual Temperature Monitor with Beta Compensation PRODUCT FEATURES GENERAL DESCRIPTION The EMC1212 is a temperature sensor that communicates with a host over a single-wire SMSC BudgetBus™ Sensor Interface. The EMC1212 monitors one internal diode and one remote temperature zone. Packaged in a SOT23-5, the EMC1212 provides an accurate, low-cost, low-current, solution for critical temperature monitoring in applications such as embedded systems or computers. When used in combination with an SMSC Super I/O host, such as a keyboard controller, a complete thermal management system is created. A power down mode extends battery life in portable applications. The internal 11-bit sigma delta temperature-to-digital converter provides superb linearity, high accuracy and excellent noise immunity. The EMC1212 is designed to operate with 65nm or 90nm PNP substrate transistor used as a thermal diode with the collector connected to ground. APPLICATIONS Desktop and Notebook Computers Hardware Management FEATURES Single Wire BBUS Interface Resistance Error Correction Beta Compensation External Temperature Monitor — 0.125°C resolution — ±1°C Accuracy 60°C to 100°C — Diode Fault Reporting Datasheet Internal Temperature Monitor — Range 0°C to +85°C — 0.125°C resolution — ±1.5°C Accuracy 50°C to 70°C Supply: — 3.0V to 3.6V — <5uA in Standby SIMPLIFIED BLOCK DIAGRAM EMC1212 Switching Current Local Temp Diode DP DN Beta Comp & REC Analog Mux and anti-aliasing filter 11-bit delta-sigma ADC Temperature Registers BBUS Interface BBUS SMSC EMC1212 DATASHEET Revision 1.1 (02-07-07) BBUS Compliant Dual Temperature Monitor with Beta Compensation Datasheet ORDER NUMBER(S): EMC1212-AGZQ-TR FOR 5 PIN, SOT LEAD-FREE ROHS COMPLIANT PACKAGE REEL SIZE IS 2,500 PIECES EVALUATION BOARD AVAILABLE UPON REQUEST (EVB-KBC1100) 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 1.1 (02-07-07) DATASHEET 2 SMSC EMC1212 BBUS Compliant Dual Temperature Monitor with Beta Compensation Datasheet Chapter 1 Pin Description VDD GND BBUS 1 2 3 5 DN 4 DP Figure 1.1 Pin Diagram for EMC1212 Table 1.1 Pin Description PIN NUMBER 1 2 3 4 5 VDD GND BBUS DP DN NAME Supply Voltage Ground Serial bus interface to SMSC host Remote diode positive terminal Remote diode negative terminal FUNCTION SMSC EMC1212 DATASHEET 3 Revision 1.1 (02-07-07) BBUS Compliant Dual Temperature Monitor with Beta Compensation Datasheet Chapter 2 Electrical Specifications 2.1 Absolute Maximum Ratings Table 2.1 EMC1212 Maximum Ratings DESCRIPTION Supply Voltage VDD Voltage on any other pin to GND Operating Temperature Range Storage Temperature Range Lead Temperature Range Package Thermal Characteristics for SOT23-5 Power Dissipation Thermal Resistance(at 0 air flow) ESD Rating, All Pins Human Body Model TBD 131.7 2000 °C/W V RATING -0.3 to 5.0 -0.3 to VDD +0.3 0 to 85 -55 to 150 Refer to JEDEC Spec. J-STD-020 UNIT V V °C °C 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 VDD = 3.3V ± 10% TA = 0°C to 85°C, all Typical values at TA = 27°C unless otherwise noted. CHARACTERISTIC SYMBOL MIN TYP MAX UNIT CONDITIONS DC Power Supply Voltage Supply Current Supply Current VDD IDD IDD 3 3.3 700 2 3.6 1000 5 V uA uA Active Mode Standby Mode Internal Temperature Monitor Temperature Accuracy ±1 ±3 ±1.5 Temperature Resolution 0.125 °C °C °C 50°C < TA < 70°C Revision 1.1 (02-07-07) DATASHEET 4 SMSC EMC1212 BBUS Compliant Dual Temperature Monitor with Beta Compensation Datasheet CHARACTERISTIC SYMBOL MIN TYP MAX UNIT CONDITIONS External Temperature Monitor Temperature Accuracy ±0.5 ±1 Temperature Resolution Conversion Time per Channel Capacitive Load tCONV CLOAD 0.125 21 400 ±1 ±3 °C °C °C mS pF Connected across remote diode 60°C < TDIODE < 100°C, 10°C < TA < 70°C 0°C < TDIODE < 125°C 2.3 BudgetBus Electrical Characteristics VDD = 3V to 3.6V, TA = 0°C to 85°C, Typical values are at TA = 27°C unless otherwise noted. CHARACTERISTIC Output High Voltage Output Low Voltage Input High Voltage Input Low Voltage SYMBOL VOH VOL VIH VIL MIN 2.4 TYP MAX UNITS V CONDITIONS 2mA Sourcing current 4mA Sinking Current 0.4 2.4 0.4 AC Parameters V V V Input Capacitance Bus Single Bit High Time or Low Time Inactive Time Power Down Time Rise Time Fall Time CIN THIGH / TLOW TINACTIVE TPWRDN TRISE TFALL 8 132 264 10 10 12 pF us us us Between Consecutive packets or after power up To initiate power down 400 400 ns ns 2.4 BudgetBus Protocol The EMC1212 communicates with a host controller, such as the SMSC KBC1100, through the proprietary single wire SMSC BudgetBus™ Sensor Interface known as BBUS. The BBUS is a single wire serial communication protocol between the computer host and its peripheral devices. Please refer to the BBUS Specification for detailed information about the modes of operation. The BudgetBus timing is shown in Figure 2.1. This timing applies to all BudgetBus communication bits. SMSC EMC1212 DATASHEET 5 Revision 1.1 (02-07-07) BBUS Compliant Dual Temperature Monitor with Beta Compensation Datasheet tRISE tFALL '0' tINACTIVE tPWRDN tLOW '1' tHIGH Figure 2.1 BudgetBus Bit Timing Revision 1.1 (02-07-07) DATASHEET 6 SMSC EMC1212 BBUS Compliant Dual Temperature Monitor with Beta Compensation Datasheet Chapter 3 Product Description The EMC1212 is a SOT23 temperature sensor with a proprietary single wire SMSC BudgetBus™ Sensor Interface. Temperature information is communicated to a host device via the serial bus. All intelligence regarding the interpretation of temperature resides in the host. The EMC1212 monitors an internal diode and single external transistor and automatically corrects for errors induced by series resistance and beta variation. Figure 3.1 shows a typical system overview: EMC1212 DP DN BBUS Host (e.g. KBC1122) BBUS Interface Figure 3.1 System Diagram of EMC1212 Thermal management consists of the host acquiring the temperature data from the EMC1212 and controlling the speed of one or more fans. Because the EMC1212 incorporates one internal and one external temperature diode, up to two separate thermal zones can be monitored and controlled. The host has the ability to compare measured temperature levels to preset limits and take the appropriate action when values are found to be out of limit. 3.1 Power Modes The EMC1212 has two basic modes of operation that are controlled entirely by the host device. Standby Mode: The host can initiate standby mode by actively pulling the BBUS low. When the Host places