(EMC1201 / EMC1202) Single/Dual Single-Wire Temp Sensor

EMC1201/EMC1202 Single/Dual Single-Wire Temp Sensor in SOT23-5 Using SMSC BudgetBusTMSensor Interface PRODUCT FEATURES General Description The EMC1201 and EMC1202 are temperature sensors that communicate with a host over a single-wire SMSC BudgetBus™ Sensor Interface. The EMC1201 has an internal temperature sensor and the EMC1202 adds one remote diode. Packaged in a SOT23-5, the EMC1201 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. Features Datasheet Single-wire SMSC BudgetBus™ Sensor Interface Low Power, 3.0V to 3.6V Supply — < 50uA at 1 conversion per second — < 3uA 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 SOT23-5 Green, Lead-free Packages Applications Desktop and Notebook Computers Thermostats Smart batteries Industrial/Automotive Other Electronic Systems PART NUMBER INTERNAL TEMPERATURE MONITOR EXTERNAL TEMPERATURE MONITOR EMC1201 EMC1202 1 1 0 1 Simplified Block Diagram EMC1201/EMC1202 Switching Current Local Temp Diode DP Analog Mux DN External Diode for EMC1202 Only 11-bit delta-sigma ADC Temperature Registers BBUS Interface BBUS SMSC EMC1201/EMC1202 DATASHEET Revision 1.0 (06-14-06) Single/Dual Single-Wire Temp Sensor in SOT23-5 Using SMSC BudgetBusTMSensor Interface Datasheet ORDER NUMBER(S): EMC1201-AGZQ-TR IN 5 PIN SOT23-5 PACKAGE (GREEN, LEAD-FREE) EMC1202-AGZQ-TR IN 5 PIN SOT23-5 PACKAGE (GREEN, LEAD-FREE) 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. 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Revision 1.0 (06-14-06) DATASHEET 2 SMSC EMC1201/EMC1202 Single/Dual Single-Wire Temp Sensor in SOT23-5 Using SMSC BudgetBusTMSensor Interface Datasheet Chapter 1 Pin Configuration VDD GND BBUS 1 2 3 5 GND/DN 4 GND/DP Figure 1.1 EMC1201 and EMC1202 Pin Configuration 1.1 Pin Description Table 1.1 EMC1201 and EMC1202 Pin Description PIN VDD GND BBUS GND/DP GND/DN PIN NO. 1 2 3 4 5 Supply Voltage VDD Ground Serial Bus Interface to SMSC Host Ground, or Diode 1 Positive Terminal, EMC1202 only Ground, or Diode 1 Negative Terminal, EMC1202 only DESCRIPTION SMSC EMC1201/EMC1202 DATASHEET 3 Revision 1.0 (06-14-06) Single/Dual Single-Wire Temp Sensor in SOT23-5 Using SMSC BudgetBusTMSensor Interface Datasheet 1.2 Absolute Maximum Ratings Table 1.2 EMC1201/EMC1202 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 SOT23-5 Power Dissipation Thermal Resistance(at 0 air flow) ESD Rating, All Pins Human Body Model TBD 131.7 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 1.0 (06-14-06) DATASHEET 4 SMSC EMC1201/EMC1202 Single/Dual Single-Wire Temp Sensor in SOT23-5 Using SMSC BudgetBusTMSensor 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 3.3 545 1.8 3.6 560 2 V μA μA Active mode (continuous) Standby mode Internal Temperature Measurement Accuracy External Temperature Measurement (EMC1202 only) Temperature Accuracy Remote Diode 60°C to 100°C Remote Diode 0°C to 125°C ADC Resolution Conversion Time per sensor 0.125 20 °C ms Active mode (continuous) See Section 3.3, "Power Modes" ±1 ±3 °C °C 15°C≤TA≤70°C 0°C≤TA≤85°C ±1 ±3 °C 0°C≤TA≤85°C SMSC EMC1201/EMC1202 DATASHEET 5 Revision 1.0 (06-14-06) Single/Dual Single-Wire Temp Sensor in SOT23-5 Using SMSC BudgetBusTMSensor Interface Datasheet Chapter 3 Product Description The EMC1201 and EMC1202 are SOT23 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 shows a typical system overview: EMC1202 DP DN BBUS Host (KBC1100) BBUS Interface Figure 3.1 System Overview Thermal management consists of the host acquiring the temperature data from the EMC1201 or EMC1202 and controlling the speed of one or more fans. Because the EMC1202 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. The EMC1202 is compatible with CPU substrate diodes. 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 change in ΔVBE voltage is proportional to absolute temperature T. Revision 1.0 (06-14-06) DATASHEET 6 SMSC EMC1201/EMC1202 Single/Dual Single-Wire Temp Sensor in SOT23-5 Using SMSC BudgetBusTMSensor Interface Datasheet VDD Ihigh Ilow Ibias fs fs fs fs/2048 Internal or Remote Diode Bias Diode Delta Vbe Sample & Hold 1-bit Sigma Delta Modulator Digital Averaging Filter 11-bit Accurate Conversion Figure 3.2 Detailed Block Diagram of Temperature Monitor Architecture Figure 3.2 shows a detailed block diagram of the temperature measurement circuit. As shown, the EMC1201 and EMC1202 incorporates switched capacitor technology that samples the temperature diode voltage at two bias currents and holds the difference voltage. The sample frequency is 100kHz and the current levels Ihigh and Ilow are 170uA and 10uA respectively. The output of the switched capacitor sample and hold circuit interfa