PDF NCT65DMR2G Data sheet ( Hoja de datos )

Número de pieza	NCT65DMR2G
Descripción	Remote Trip Point Temperature Sensor
Fabricantes	ON Semiconductor
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No Preview Available ! NCT65 Remote Trip Point Temperature Sensor with Overtemperature Shutdown Description The NCT65 is a low power temperature monitor housed in an MSOP8 package. It monitors the temperature of a remote thermal diode. The resulting temperature is then compared with fixed THERM limits (70C and 85C) and if the resulting temperature is greater than these limits, the open-drain THERM1 and THERM2 pins are asserted. To prevent constant assertion and deassertion of the THERM outputs the NCT65 has 5C of hysteresis. The NCT65 supply range is 2.8 V to 3.6 V and features low supply current making it suitable for portable applications. Features  Remote Temperature Sensor  0C − 85C Measurement Range  Two Overtemperature THERM Shutdown Pins  THERM1 Trip Point = 70C, THERM2 Trip Point = 85C  Low Power Operation  MSOP Package  These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS Compliant Applications  Smart Phones  Consumer Electronics  Embedded Systems  Smart Batteries  Desktop and Notebook Computers http://onsemi.com MSOP−8 RM SUFFIX CASE 846AB PIN CONNECTIONS VDD D+ D− THERM2 1 NCT65 (Top View) GND GND THERM1 GND MARKING DIAGRAM 8 NCT65 AYWG G 1 NCT65 = Specific Device Code A = Assembly Location Y = Year W = Work Week G = Pb-Free Package (Note: Microdot may be in either location) ORDERING INFORMATION Device Package Shipping† NCT65DMR2G MSOP−8 3,000/Tape & Reel (Pb-Free) †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D.  Semiconductor Components Industries, LLC, 2012 August, 2012 − Rev. 1 1 Publication Order Number: NCT65/D 1 page NCT65 Remote Sensing Diode The NCT65 is designed to work with substrate transistors built into processors or with discrete transistors. Substrate transistors are generally PNP types with the collector connected to the substrate. Discrete types are either PNP or NPN transistors connected as diodes (base-shorted to collector). If an NPN transistor is used, the collector and base are connected to D+ and the emitter to D−. If a PNP transistor is used, the collector and base are connected to D− and the emitter to D+. Layout Considerations Digital boards can be electrically noisy environments, and the NCT65 is measuring very small voltages from the remote sensor, so care must be taken to minimize noise induced at the sensor inputs. Take the following precautions:  Place the NCT65 as close as possible to the remote sensing diode. Provided that the worst noise sources, that is, clock generators, data/address busses etc., are avoided, this distance can be 4 to 8 inches.  Route the D+ and D− tracks close together, in parallel, with grounded guard tracks on each side. To minimize inductance and reduce noise pickup, a 5 mil track width and spacing is recommended. Provide a ground plane under the tracks, if possible.  Place a 0.1 mF bypass capacitor close to the VDD pin. In extremely noisy environments, place an input filter capacitor across D+ and D− close to the NCT65. This capacitance can effect the temperature measurement, so ensure that any capacitance seen at D+ and D− is, at maximum, 1,000 pF. This maximum value includes the filter capacitance, plus any cable or stray capacitance between the pins and the sensor diode. GND D+ D− GND 5 MIL 5 MIL 5 MIL 5 MIL 5 MIL 5 MIL 5 MIL Figure 4. Typical Arrangement of Signal Tracks Application Circuit The figure below shows a typical application circuit for the NCT65, using an embedded transistor on a GPU to measure the temperature. The THERM1 pin can be used to alert the system and throttle the GPU. The THERM2 pin can be used to shutdown the system if necessary. Both pins require pullup resistors to VDD or an alternative supply (up to 3.6 V). GPU D+ 2 D− 3 NCT65 VDD 1 REFERENCE LOW PASS FILTER DIFFERENCE AMPLIFIER REFERENCE V+ (up to 3.6 V) T_TRIP = 85C + COMPARATOR − 10 kW 4 THERM2 − COMPARATOR + T_TRIP = 70C 10 kW THERM1 6 57 8 GND Figure 5. Typical Configuration Block Diagram http://onsemi.com 5 5 Page

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