Application Note
AN000325
AS62xx
Thermal Design Guideline for PCB Reference
Design
v4-00 • 2020-Nov-23
Document Feedback AS62xx
Content Guide
Content Guide
1
1.1
2
2.1
2.2
Introduction ................................... 3
Ordering Information .................................... 3
Temperature Sensing of
Components on PCB .................... 4
Temperature Sensing on Same PCB Layer
Side .............................................................. 4
Temperature Sensing on the Opposite PCB
Layer Side .................................................... 4
3
3.1
3.2
4
5
Thermal Load vs. Temperature
Response Time .............................. 6
Reduce Thermal Load with PCB Cut ........... 6
Flex PCB....................................................... 7
Revision Information ..................... 8
Legal Information ........................... 9
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Introduction
1 Introduction
The AS62xx device family is a digital temperature sensor family for applications that require small form factors, ultra-low power consumption and high accuracy.
Temperature monitoring could be challenging and with this document, some design guidelines are listed to support you in your product design.
1.1 Ordering Information
Ordering Code Package
AS6221-AWLT-S
AS6221-AWLT-L
AS6212-AWLT-S
AS6212-AWLT-L
AS6214-AWLT-S
AS6214-AWLT-L
AS6218-AWLT-S
AS6218-AWLT-L
WLCSP
WLCSP
WLCSP
WLCSP
WLCSP
WLCSP
WLCSP
WLCSP
AS6204-AWLM-S
AS6204-AWLT-L
WLCSP
WLCSP
AS6200C-AWLM-S WLCSP
AS6200C-AWLT-L WLCSP
AS6200-AWLT-S
AS6200-AWLT-L
WLCSP
WLCSP
Marking Delivery Form
AS6221
AS6221
AS6212
AS6212
AS6214
AS6214
AS6218
AS6218
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
AS6204
AS6204
Tape & Reel
Tape & Reel
AS6MCC Tape & Reel
AS6MCC Tape & Reel
AS6200
AS6200
Tape & Reel
Tape & Reel
Delivery Quantity
500 pcs/reel
5000 pcs/reel
500 pcs/reel
5000 pcs/reel
500 pcs/reel
5000 pcs/reel
500 pcs/reel
5000 pcs/reel
500 pcs/reel
5000 pcs/reel
500 pcs/reel
5000 pcs/reel
500 pcs/reel
5000 pcs/reel
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Temperature Sensing of Components on PCB
2 Temperature Sensing of Components on
PCB
2.1 Temperature Sensing on Same PCB Layer Side
In order to get a good sensing results the AS62xx should be placed as near as possible to the component you want to sense. Connect the common GND plane as close as possible together as
shown in Figure 1.
Keep other copper layers and vias away from sensor to minimize the thermal load
Figure 1:
Copper Connection on Same Layer for Heat Transfer
The advantage of same side measuring is that to keep influence of other heat sources of the bottom side away from the sensor.
2.2 Temperature Sensing on the Opposite PCB Layer Side
Thermal vias can be used in case the sensing component is on the bottom side as shown in Figure 2.
In order to reduce thermal load make sure there are no copper layers between sensor and the component you want to sense.
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Figure 2:
Temperature Sensing over Thermal Via
AS62xx
Temperature Sensing of Components on PCB
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Thermal Load vs. Temperature Response Time
3 Thermal Load vs. Temperature Response
Time
3.1 Reduce Thermal Load with PCB Cut
3.1.1 Cutout Through PCB
To further improve the response time of the sensor, it is recommended to reduce the thermal capacity of the PCB. One important measure is to keep the area around the sensor free of any copper planes.
In addition to that, a cutout as can be seen in Figure 3 should be applied.
Figure 3:
PCB Cutout
3.1.2 PCB Cutout Area
In addition, to reduce thermal load of the PCB the bottom side can be cut out as shown in Figure 4
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Figure 4:
PCB Cutout Bottom Side
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Thermal Load vs. Temperature Response Time
3.2 Flex PCB
Another possibility to reduce thermal load is the use of a rigid flex PCB. In the Figure 5 an application
example shows how it can be done to measure the housing temperature. A thermal tape or adhesive can be used to fix the rigid flex to the case. The exposed pad increases the thermal conduction. In best case, use a thermal via to connect the sensor ground.
Figure 5:
Sensor on Rigid Flex PCB
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4 Revision Information
AS62xx
Revision Information
Changes from previous version to current revision v4-00 Page
●
●
Updated Ordering Information table with AS6221
3
Page and figure numbers for the previous version may differ from page and figure numbers in the current revision.
Correction of typographical errors is not explicitly mentioned.
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5 Legal Information
AS62xx
Legal Information
Copyrights & Disclaimer
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