(EMC1203 / EMC1204) Triple/Quad Single-Wire Temp Sensor

EMC1203/EMC1204 Triple/Quad Single-Wire Temp Sensor in MSOP-8 Using SMSC BudgetBusTM Sensor Interface Datasheet General Description The EMC1203 and EMC1204 are temperature sensors that communicate with a host over a single-wire SMSC BudgetBus™ Sensor Interface. The EMC1203 has an internal temperature sensor and monitors up to two remote diodes. An additional remote diode is added with the EMC1204 for a total of three remote zones, and both devices are in a small MSOP-8 package. 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 preserves battery life in portable applications. The internal 11-bit sigma delta temperature-to-digital converter provides superb linearity, high accuracy and excellent noise immunity. Features Single-wire SMSC BudgetBus™ Sensor Interface Low Power, 3.0V to 3.6V Supply — < 50uA at 1 conversion per second — < 2.5uA in Standby External Temperature Sensor — — — — Range -63.875º C to +191.875º C 0.125º C resolution ±1º C Accuracy 60º C to 100º C Diode Fault Reporting Self Contained Internal Temperature Sensor — Range 0º C to +85º C — 0.125º C resolution — ±3º C Accuracy 0º C to 85º C MSOP-8 3x3mm packages; green, lead-free packages also available PART NUMBER EMC1203 EMC1204 INTERNAL TEMPERATURE MONITOR 1 1 REMOTE TEMPERATURE MONITOR 2 3 Applications Desktop Computers Notebook Computers Server Applications Simplified Block Diagram Switching Current EMC1203/EMC1204 DP1 DN1 Analog Mux DP2/DN3 DN2/DP3 Local Temp Diode 11-bit Sigma Delta ADC Temperature Registers BBUS Interface BBUS SMSC EMC1203/EMC1204 DATASHEET Revision 1.1 (06-12-06) Triple/Quad Single-Wire Temp Sensor in MSOP-8 Using SMSC BudgetBusTM Sensor Interface Datasheet ORDER NUMBER(S): EMC1203-ACZL-TR IN 8 PIN MSOP PACKAGE (GREEN, LEAD-FREE) EMC1204-ACZL-TR IN 8 PIN MSOP PACKAGE (GREEN, LEAD-FREE) Reel size is 4,000 pieces. Evaluation Board available upon request. (EVB-KBC1100) 80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123 Copyright © 2006 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. 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Revision 1.1 (06-12-06) DATASHEET ii SMSC EMC1203/EMC1204 Triple/Quad Single-Wire Temp Sensor in MSOP-8 Using SMSC BudgetBusTM Sensor Interface Datasheet Chapter 1 Pin Configuration DP1 DN1 DN2/DP3 DP2/DN3 1 8 VDD GND SCLK BBUS 2 EMC1203/ 7 EMC1204 3 TOP VIEW 6 4 5 Figure 1.1 EMC1203 and EMC1204 Pin Configuration 1.1 Pin Description Table 1.1 EMC1203 and EMC1204 Pin Description PIN DP1 DN1 DN2/DP3 DP2/DN3 BBUS SCLK GND VDD PIN NO. 1 2 3 4 5 6 7 8 DESCRIPTION Positive Analog Connection to External Temperature Diode 1 Negative Analog Connection to External Temperature Diode 1 Negative Analog Connection to External Temperature Diode 2 Positve Analog Connection to External Temperature Diode 3, EMC1204 only Positve Analog Connection to External Temperature Diode 2 Negative Analog Connection to External Temperature Diode 3, EMC1204 only Serial Bus Interface to BBUS Host Normally GND, this pin may be configured to source a synchronous clock. Ground Supply Voltage VDD SMSC EMC1203/EMC1204 DATASHEET 1 Revision 1.1 (06-12-06) Triple/Quad Single-Wire Temp Sensor in MSOP-8 Using SMSC BudgetBusTM Sensor Interface Datasheet 1.2 Absolute Maximum Ratings Table 1.2 EMC1203 and EMC1204 Maximum Ratings DESCRIPTION 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 Supply Voltage VDD Voltage on any other pin Operating Temperature Range Storage Temperature Range Lead Temperature Range Package Thermal Characteristics for MSOP-8 Power Dissipation Thermal Resistance(at 0 air flow) ESD Rating, All Pins Human Body Model TBD 109.6 2000 °C/W 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. Revision 1.1 (06-12-06) DATASHEET 2 SMSC EMC1203/EMC1204 Triple/Quad Single-Wire Temp Sensor in MSOP-8 Using SMSC BudgetBusTM Sensor Interface Datasheet Chapter 2 Electrical Characteristics Table 2.1 Electrical Characteristics VDD=3.0V to 3.6V, TA= 0°C to +85°C, Typical values at TA = 27°C unless otherwise noted PARAMETER DC Power Supply Voltage Average Operating Current SYMBOL MIN TYP MAX UNITS CONDITIONS VDD IDD IPD 3.0 3.3 600 1.8 3.6 650 2.5 V μA μA Active mode (continuous) Standby mode Internal Temperature Measurement Accuracy External Temperature Measurement Temperature Accuracy Remote Diode 60°C to 100°C Remote Diode 0°C to 125°C Remote Diode 0°C to 125°C ADC Resolution Conversion Time per sensor 0.125 20 °C ms ±1 ±3 TBD °C °C °C 15°C≤TA≤70°C 0°C≤TA≤85°C -40°C≤TA≤125°C ±1 ±3 °C 0°C≤TA≤85°C SMSC EMC1203/EMC1204 DATASHEET 3 Revision 1.1 (06-12-06) Triple/Quad Single-Wire Temp Sensor in MSOP-8 Using SMSC BudgetBusTM Sensor Interface Datasheet Chapter 3 Product Description The EMC1203 and EMC1204 are temperature sensors 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. Figure 3.1, "System Overview" shows a typical system overview: EMC1203/ EMC1204 DP1 DN1 BBUS DP2/DN3 DN2/DP3 Host (KBC1100) BBUS Interface Figure 3.1 System Overview In cooperation with the host device, thermal management can be performed as shown in Figure 3.1. Thermal management consists of the host acquiring the temperature data from the EMC1203 and EMC1204 controlling the speed of one or more fans. 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. The EMC1203 and the DP1/DN1 port of the EMC1204 are compatible with CPU substrate diodes. Two separate temperature zones are monitored using only two pins on the EMC1204. This is accomplished using two anti-parallel diodes as shown on the pins DP2/DN3 and DN2/DP3 in Figure 3.1. This technique maintains high accuracy while minimizing pin count and reducing board routing complexity. The anti-parallel diode architecture performs very well with diode connected transistors. It is not compatible with substrate transistors (sometimes called thermal diodes or on-chip sense junctions). 3.1 Temperature Monitors Thermal diode temperature measurements are based on the change in forward bias voltage (ΔVBE) of a diode when operated at two different currents: where: ΔVBE = VBE _ HIGH − VBE _ LOW ⎛I ln⎜ HIGH = ⎜I q ⎝ LOW ηkT ⎞ ⎟ ⎟ ⎠ k = Boltzmann’s constant T = absolute temperature in Kelvin q = electron charge η = diode ideality factor The