ADT6401

ADT6401/ADT6402 (Rev. C)

Document overview

• Manufacturer or author: Analog Devices, Inc.
• PDF pages: 12

Technical content

Low Cost, 2.7 V to 5.5 V, Pin-Selectable Temperature Switches in SOT-23 Data Sheet ADT6401/ADT6402 Rev. C Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Tel: 781.329.4700 ©2008–2013 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com

FEATURES

±0.5°C (typical) threshold accuracy Pin-selectable trip points from −45°C to +5°C in 10°C increments (undertemperature) 45°C to 115°C in 10°C increments (overtemperature) Maximum operating temperature of 125°C Open-drain output (ADT6401) Push-pull output (ADT6402) Pin-selectable hysteresis of 2°C and 10°C Supply current of 30 µA (typical) Space-saving, 6-lead SOT-23 package

APPLICATIONS

2ºC/10ºC VCC GND TOVER/TUNDER6 TRIP POINT AND HYSTERESIS DECODING ADT6401 COMPARATOR Σ-Δ TEMPERATURE-TO- DIGITAL CONVERTER S2 1 S1 2 S0 3 07415-001 Figure 1. GENERAL DESCRIPTION The ADT6401/ADT6402 are trip point temperature switches available in a 6-lead SOT-23 package. Each part contains an internal band gap temperature sensor for local temperature sensing. When the temperature crosses the trip point setting, the logic output is activated. The ADT6401 logic output is active low and open-drain. The ADT6402 logic output is active high and push-pull. The temperature is digitized to a resolution of 0.125°C (11-bit). The pin-selectable trip point settings are 10°C apart starting from −45°C to +5°C for undertemperature switching, and from 45°C to 115°C for overtemperature switching. These devices typically consume 30 μA of supply current. Hystere- sis is pin selectable at 2°C and 10°C. The temperature switch is specified to operate over the supply range of 2.7 V to 5.5 V . When the ADT6401/ADT6402 are used for monitoring tempera- tures from 45°C to 115°C, the logic output pin becomes active when the temperature goes higher than the selected trip point temperature. When the ADT6401/ADT6402 are used for monitoring tempera- tures from −45°C to +5°C, the logic output pin becomes active when the temperature goes lower than the selected trip point temperature. PRODUCT HIGHLIGHTS 1. Σ-Δ based temperature measurement gives high accuracy and noise immunity. 2. Wide operating temperature range from −55°C to +125°C. 3. ±0.5°C typical accuracy from −45°C to +115°C. 4. Pin-selectable threshold settings from −45°C to +115°C in 10°C increments. 5. Supply voltage is 2.7 V to 5.5 V . 6. Supply current of 30 μA. 7. Space-saving, 6-lead SOT-23 package. 8. Pin-selectable temperature hysteresis of 2°C or 10°C. 9. Temperature resolution of 0.125°C.

ADT6401/ADT6402 Data Sheet Rev. C | Page 2 of 12 TABLE OF CONTENTS

REVISION HISTORY

4/13—Rev. B to Rev. C 9/12—Rev. A to Rev. B Change to Specifications Table 1, Supply Current Parameter .... 3 6/10—Rev. 0 to Rev. A 5/08—Revision 0: Initial Version

Data Sheet ADT6401/ADT6402 Rev. C | Page 3 of 12 SPECIFICATIONS TA = −55°C to +125°C, VCC = 2.7 V to 5.5 V, open-drain RPULL-UP = 10 kΩ, unless otherwise noted. Table 1. Parameter Min Typ Max Unit Test Conditions/Comments TEMPERATURE SENSOR AND ADC Threshold Accuracy ±0.5 ±6 °C TA = −45°C to −25°C ±0.5 ±4 °C TA = 35°C to 65°C ±0.5 ±6 °C TA = 75°C to 115°C ADC Resolution 11 Bits Temperature Conversion Time 30 ms Time necessary to complete a conversion Update Rate 600 ms Conversion started every 600 ms Temperature Threshold Hysteresis 2 °C Pin selectable, depends on S0, S1, S2 settings 10 °C Pin selectable, depends on S0, S1, S2 settings DIGITAL OUTPUT (OPEN-DRAIN) Output High Current, IOH 10 nA Leakage current, VCC = 2.7 V and VOH = 5.5 V Output Low Voltage, VOL 0.3 V IOL = 1.2 mA, VCC = 2.7 V 0.4 V IOL = 3.2 mA, VCC = 4.5 V Output Capacitance, COUT1 10 pF RPULL-UP = 10 kΩ DIGITAL OUTPUT (PUSH-PULL) Output Low Voltage, VOL 0.3 V IOL = 1.2 mA, VCC = 2.7 V 0.4 V IOL = 3.2 mA, VCC = 4.5 V Output High Voltage, VOH 0.8 × VCC V ISOURCE = 500 µA, VCC = 2.7 V VCC − 1.5 V ISOURCE = 800 µA, VCC = 4.5 V Output Capacitance, COUT1 10 pF POWER REQUIREMENTS Supply Voltage 2.7 5.5 V Supply Current 30 55 µA 1 Guaranteed by design and characterization.

1 Values relate to package being used on a standard 2-layer PCB, which gives a

worst-case θJA. Refer to Figure 2 for a plot of maximum power dissipation vs.

3 Junction-to-case resistance is applicable to components featuring a

Figure 2. SOT-23 Maximum Power Dissipation vs. Temperature

accuracy in an extremely compact circuit. the comparator output in response to input voltage changes. overall noise performance and increasing accuracy. hysteresis value, as outlined in Table 4. Table 4. Selecting Trip Points and Hysteresis

0 Float 0 +105°C 2°C

0 Float 1 +115°C 2°C

0 Float Float +55°C 10°C

1 Float 0 +5°C 2°C

1 Float 1 −5°C 2°C

1 Float Float −15°C 2°C

1 0 = pin tied to GND, 1 = pin tied to VCC, Float = pin left floating.

ADT6401/ADT6402 Data Sheet Rev. C | Page 12 of 12 OUTLINE DIMENSIONS COMPLIANT TO JEDEC STANDARDS MO-178-AB 10° SEATING PLANE 1.90 BSC

0.95 BSC

0.60 BSC 123 3.00 2.90 2.80 3.00 2.80 2.60 1.70 1.60 1.50 1.30 1.15 0.90

0.15 MAX

0.05 MIN

1.45 MAX

0.95 MIN

0.20 MAX

0.08 MIN

0.50 MAX

0.30 MIN

0.55 0.45 0.35 PIN 1 INDICATOR 12-16-2008-A Figure 23. 6-Lead Small Outline Transistor Package [SOT-23]

Description

ADT6401SRJZ-RL7 −55°C to +125°C 6-Lead SOT-23 RJ-6 3,000 T30 ADT6402SRJZ-RL7 −55°C to +125°C 6-Lead SOT-23 RJ-6 3,000 T32 1 Z = RoHS Compliant Part. ©2008–2013 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the prop erty of their respective owners. D07415-0-4/13(C)