Telit Wireless Solutions LM960 Guida

LM960

Thermal Design Guide

1VV0301620 Rev. 2 –2021-09-09

Telit Technical Documentation

LM960 Thermal Design Guide

1VV0301620 Rev. 2 Page 2of 26 2021-09-09

Not Subject to NDA

APPLICABILITY TABLE

PRODUCTS

LM960

LM960A18

 LM960 Thermal Design Guide 
 
 1VV0301620 Rev. 2 Page 3of 26 2021-09-09 
 
Not Subject to NDA 
CONTENTS 
APPLICABILITY TABLE 2 
CONTENTS 3 
1. INTRODUCTION 5 
 Scope 5 
 Audience 5 
 Contact Information, Support 5 
 Symbol Conventions 6 
 Related Documents 6 
2. THERMAL MODEL 7 
 Temperature Sensor and Hotspot 7 
2.1.1. Temperature Reading and Monitoring 7 
 Thermal Mitigation Algorithm 9 
2.2.1. Thermal Mitigation Level Reading 10 
2.2.2. How to Change Thermal Mitigation Level Range 11 
 Thermal Model -TBD 13 
 Temperature Range 14 
 Current Consumption in Each Mode 14 
3. THERMAL DESIGN 16 
 Thermal Design Guidelines 16 
 Thermal Design Solution 16 
4. PRODUCT AND SAFETY INFORMATION 20 
 Copyrights and Other Notices 20 
4.1.1. Copyrights 20 
4.1.2. Computer Software Copyrights 20 
 Usage and Disclosure Restrictions 21 
4.2.1. License Agreements 21 
4.2.2. Copyrighted Materials 21 

LM960 Thermal Design Guide

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4.2.3. High Risk Materials 21

4.2.4. Trademarks 22

4.2.5. Third Party Rights 22

4.2.6. Waiver of Liability 22

Safety Recommendations 23

5. GLOSSARY 24

6. DOCUMENT HISTORY 25

LM960 Thermal Design Guide

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1. INTRODUCTION

Scope

This document provides thermal model and design guidelines useful for developing a

product with the Telit LM960.

Note: Proper thermal protection design protects against human or

component damage under the worst-case conditions.

And it reduces the probability of failure and does not adversely affect

the use of the module, and greatly extends the operation time with

maximum performance.

Audience

This document is intended system integrators that are using the Telit LM960 module in

their products.

Contact Information, Support

For technical support and general questions please e-mail:

•

•

•

•

•

Alternatively, use:

https://www.telit.com/contact-us/

Product information and technical documents are accessible 24/7 on our web site:

https://www.telit.com

LM960 Thermal Design Guide

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Symbol Conventions

Danger: This information MUST be followed or catastrophic

equipment failure or personal injury may occur.

Warning: Alerts the user on important steps about the module

integration.

Note/Tip: Provides advice and suggestions that may be useful when

integrating the module.

Electro-static Discharge: Notifies the user to take proper grounding

precautions before handling the product.

Table 1: Symbol Conventions

All dates are in ISO 8601 format, that is YYYY-MM-DD.

Related Documents

•LM960 HW User Guide, 1VV0301485

•LM960 SW User Guide, 1VV0301477

LM960 Thermal Design Guide

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2. THERMAL MODEL

Temperature Sensor and Hotspot

LM960 has three thermistors inside the module. The internal temperature can be

monitored by the AT command.

Figure 1: LM960 Temp Sensor & Hotspot

As you can see in the figure above, inside the LM960 there are three temperature sensors

(TSENS2, PA_THERM0, PA_THERM1). And it can be read from internal temperatures

using the AT#TEMPSENS command.

2.1.1. Temperature Reading and Monitoring

AT#TEMPSENS command provides several methods to read the internal temperature as

instant or periodic reports and to monitor the internal temperature using URC and GPIO.

LM960 Thermal Design Guide

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#TEMPSENS –Temperature monitor

AT#TEMPSENS=

[,<action>

,<low_temp>

,<high_temp>

[,<gpio>]]]

Set command sets the operation of the internal temperature monitor.

Parameters:

<mod>

0 –disables the periodic reporting (factory default)

1 –enables the periodic reporting

2 –instantaneous reporting of the Temperature

Note: the module cannot enter sleep when <mod>=1.

<interval> - duration in seconds of the interval between next measurement. It has

meaning only if <mod> is 1.

The unsolicited message is in the format:

#TEMPSENS: <sensor>,<value>

where:

<sensor> - temperature sensor name

<value> - actual temperature expressed in Celsius degrees

1 - (01) - it enables the presentation of the temperature monitor

URC periodically. If <action> is not specified, this is

default.

2 - (10) - it enables the presentation of the temperature notification

URC, whenever the module internal temperature

reaches either <low_temp> or <high_temp> levels.

4 - (100) - output pin <gpio> is tied HIGH when set temperature

bounds are reached; when the temperature is back to

normal the output pin <gpio> is tied LOW. It is

mandatory to set the <gpio> parameter too to set this

<action>.

The notification message is in the format:

#TEMPNOTI: <level>,<value>

where:

<level> - threshold level

-1 - <low_temp> set temperature lower bound

0 - normal temperature

1 - <high_temp> set temperature upper bound

Note: Possible values for the parameter <action> are form 1 to 7 (001, 010, 011, 100, 101,

110 and 111)

<low_temp> - Temperature Lower Bound

(-40 –0, Celsius Degrees)

<high_temp> - Temperature Upper Bound

(0 –100, Celsius Degrees)

LM960 Thermal Design Guide

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#TEMPSENS –Temperature monitor

<gpio> - GPIO number. Valid range is any GPIO pin as described in

#GPIO command. This parameter is needed and required

only if <action>=4, 5, 6 or 7 are enabled.

AT#TEMPSENS?

Read command reports the current parameter settings in the format:

#TEMPSENS: <mod>,<interval>[,<action>,<low_temp>,<high_temp>,[<gpio>]]

AT#TEMPSENS=?

Test command reports supported range of values for parameters

<mod>,<interval>,<action>,<low_temp>,<high_temp> and <gpio>.

Example

AT#TEMPSENS=2

#TEMPSENS: TSENS2,29

#TEMPSENS: PA_THERM0,30

#TEMPSENS: PA_THERM1,30

Table 2: AT Command for Temperature Monitoring

Thermal Mitigation Algorithm

LM960 has a built-in thermal mitigation algorithm to reduce the probability of failure and

extend the operation time with maximum performance. The thermal mitigation algorithm

operates according to the internal temperature value read through the three

temperature sensors. The Thermal mitigation algorithm limits the performance(DL/UL

throttling, Tx power back off, call drop.. etc) when the temperature is above a defined

certain level.

Thermal Mitigation Level

Temperature sensors have several levels of thermal mitigation. Each level has

predefined actions as in the table below and works individually in the sensor. Performs

the following actions based on the mitigation level to reduce/control the temperature.

Sensor

Level

Action

Comment

PA_THERM

Normal

Enable UL data throttling

Start throttling the uplink data rate by reporting

a smaller buffer status report.

Enable MTPL back-off

Limit maximum Tx power (23dBm)

Lmitied service mode

Call released.

TSENS

Normal

Start DL data throttling

#3DL CA drops to 1DL (PCC only)

Limited service mode

Call released.

Table 3: Thermal Mitigation Level and Action

LM960 Thermal Design Guide

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After entering mitigation level 3, the limited service mode is released after the

PA_THERM and TSENS sensor reaches mitigation level 0. In other words, the sensor

reading falls below the level 1 clearing thresholds.

2.2.1. Thermal Mitigation Level Reading

AT#TMLVL command used for read current thermal mitigation level of each temperature

sensors.

#TMLVL –Thermal Mitigation Level

AT#TMLVL=<device_id>

Set command reports a current thermal mitigation level of specific <device_id>.

Parameters:

<device_id> - which device to get mitigation level

1 –TSENS2

2 –PA_THERM

The report message is in the format:

#TMLVL: <level>

Where:

<level> - thermal mitigation level

0 –normal

1 –level1

2 –level2

3 –level3

Note : level2 is shown only with PA_THERM device.

AT#TMLVL?

Read command reports a current thermal mitigation level of all devices in the format:

#TMLVL: TSENS2,<level>

#TMLVL: PA_THERM,<level>

AT#TMLVL=?

Test command returns the supported range of values for parameter <device_id>.

Example

AT#TMLVL?

#TMLVL: TSENS2,1

#TMLVL: PA_THERM,1

AT#TMLVL=2

#TMLVL: 1

Table 4: AT Command for Thermal Mitigation Level Reading

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