Wavecom GX64 Montage- und Bedienungsanleitung

GX64

PPLICATION NOTE

Charging Interface

Reference:

I_DEV_Gx64_APN_002

Version: 001

Date: 2007/01/30

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Charging Interface

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This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement.

Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à des tiers sans son autorisation préalable

Trademarks

®, WAVECOM®, WISMO®, Open AT®, Wireless CPU®, Wireless Microprocessor®and certain

other trademarks and logos appearing on this document, are filed or registered trademarks

of Wavecom S.A. in France or in other countries. All other company and/or product names

mentioned may be filed or registered trademarks of their respective owners.

be reproduced in any form without the prior written permission of WAVECOM.

No patent liability is assumed with respect to the use of the information contained herein.

No Warranty

WAVECOM publishes this manual without making any warranty as to the content contained

herein. Further Wavecom Inc reserves the right to make modifications, additions and

deletions to this manual due to typographical errors, inaccurate information, or

improvements to programs and/or equipment at any time and without notice. Such changes

will, nevertheless be incorporated into new editions of this manual.

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Charging Interface

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This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement.

Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à des tiers sans son autorisation préalable

Table of Contents

1General ................................................................................................... 5

1.1 SCOPE ...................................................................................................................... 5

1.2 ABBREVIATIONS ........................................................................................................ 5

1.3 NOTATION ............................................................................................................... 6

2Built-in Charge Circuitry ......................................................................... 7

2.1 OVERVIEW ................................................................................................................ 7

2.1.1 GR/GS64 CHARGING BLOCK DIAGRAM................................................................ 7

2.1.2 APPLICATION CHARGING BLOCK DIAGRAM ......................................................... 8

2.2 IMPLEMENTATION..................................................................................................... 8

2.2.1 HARDWARE ........................................................................................................ 8

2.2.2 SOFTWARE IMPLEMENTATION........................................................................... 10

2.2.3 CHARGING VIA USB .......................................................................................... 11

2.3 OPERATION ............................................................................................................ 12

3Charger Power Supply (CPS) Reference Designs ..................................... 14

3.1 DISCLAIMER............................................................................................................ 14

3.1 DC/DC VERSION ..................................................................................................... 14

3.2 AC/DC VERSION ..................................................................................................... 15

4Using Custom Charge Circuitry ............................................................. 16

4.1 LM3658 SINGLE CHIP CHARGER SOLUTION.............................................................. 16

4.1.1 OVERVIEW ........................................................................................................ 16

4.1.2 CHARGING FROM AC/DC OR DC/DC-ADAPTER................................................. 17

Appendix A: AC/DC 5V supply ................................................................... 18

Appendix B: DC/DC 5V supply ................................................................... 19

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This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement.

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Table of Figures

Figure 1. GR/GS64 Charge Circuitry Block Diagram........................................................... 7

Figure 2. Application Charging Block Diagram .................................................................. 8

Figure 3. USB Charger Block Diagram.............................................................................. 11

Figure 4. Charger State Diagram ..................................................................................... 13

Figure 5. LM3658 Implementation Block Diagram ........................................................... 17

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This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement.

Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à des tiers sans son autorisation préalable

1General

1.1 Scope

This document is meant to be used in addition to the Integrators Manual of the

intended GR/GS64 Wireless CPU. Basic information such as electrical requirements,

safety concerns, etc. can be found in the Integrators Manual, while this document

focuses more on the different aspects of application implementations.

GR/GS64 Wireless CPUs are designed with the capability to be integrated into an

application which supplies it with power from a Li-Ion battery and provides the

capability to charge this battery through an internal charging algorithm.

Application requirements are:

•A charger voltage and current limited to ~5.5V and 500mA respectively with a

reverse current protection diode (CPS).

•A Li-Ion battery pack, with a built-in Thermistor that shares a common

ground with the battery pack.

•Thermistor bias resistor from VREF to ADIN1.

1.2 Abbreviations

Abbreviation Description

ADC Analogue to Digital Conversion

ADIN1 Designated ADC-input for battery thermistor.

Application Customer hardware and software that contain and control

the GR/GS64 Wireless CPU.

CPS

Charger Power Supply. Refers to the 500mA current limited

supply that should be connected to the CHG_IN-signal of the

GR/GS64.

DRX GSM Discontinuous Receive mode.

FRC AT-command Final Result Code

NTC Negative Temperature Coefficient Thermistor

NVM Non Volatile Memory

PTC Positive Temperature Coefficient Thermistor

RTH nom Nominal Thermistor resistance value at 25°C.

VREF

Reference voltage used by the interface logic. This signal is

either an output from the Wireless CPU (GS64, GR64001), or

an input to the Wireless CPU (GR64002).

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This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement.

Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à des tiers sans son autorisation préalable

1.3 Notation

The following symbols and admonition notation are used to draw the reader’s

attention to notable or crucially-important information.

Note

Draws the readers attention to pertinent, useful or interesting

information

Tip

Provides advice, suggestions, guidance or recommendations which

augment the formal text

Caution

Cautionary information must be heeded, it draws the readers attention

to the need for understanding, care or watchfulness in relation to the

information provided

Warning

Notes marked warning must be heeded, they alert readers to

precautionary measures, risks, hazards or safety information which

directly effects equipment function, warranty or personnel safety

Danger

This information must be heeded, it identifies information and

cautionary behaviour that otherwise ignored could result in

catastrophic equipment failure, bodily injury or death

TIP

CAUTION

WARNING

DANGE

NOTE

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2Built-in Charge Circuitry

2.1 Overview

The charging algorithm and its support circuitry that is built into the GR/GS64 family

of products require a DC-voltage on the CHG_IN signal. It also requires a Li-Ion

battery connected between VCC and GND of the system connector. The Li-Ion battery

must include a thermistor with one side connected to GND and the other connected to

ADIN1 of the system connector, so that the battery cell temperature can be

monitored. The thermistor temperature curve can be calibrated by the customer,

making the application very flexible.

The CPS for the charger must be a 500mA current limited 4.5V to 6.0V supply with

reversed current protection.

2.1.1 GR/GS64 Charging Block Diagram

All circuitry required to charge a Li-Ion battery is included in the Wireless CPU. Below

is a block diagram that gives a basic view of how it is implemented inside the Wireless

CPU.

Figure 1. GR/GS64 Charge Circuitry Block Diagram

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2.1.2 Application Charging Block Diagram

The figure below shows a typical implementation of a battery solution with a

capability to charge using the built-in charger of the GR/GS64 Wireless CPU.

Figure 2. Application Charging Block Diagram

2.2 Implementation

2.2.1 Hardware

The following subsections define the Charging Power Supply and Battery Thermistor,

software implementation, and general hardware usage.

2.2.1.1 Charging Power Supply (CPS)

To charge a single cell Li-Ion battery a voltage and current limited power supply is

required between the CHG_IN-input of the Wireless CPU and ground. Reference

designs for an AC/DC and a DC/DC charger are provided in Appendix A and B at the

end of this document.

The CPS must have a reverse current protection diode on its output and a capacitor of

at least 10uF value must be provided as close to the CHG_IN signal as possible.

A single Li-Ion battery should be applied between all six VCC and GND pins. The

routing length should be kept to a minimum and be designed to handle a minimum of

3A current. This leaves approximately 50% margin.

A bias resistor for the battery built-in thermistor is required. This resistor should be

connected between VREF and ADIN1 (see Battery Thermistor section below).

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2.2.1.2 Battery Thermistor

The battery thermistor can be of either PTC or NTC type. The resistor value of both

the thermistor and the bias resistor shall be selected so that the most optimal ADC-

range is available. The slope of the Thermistor curve is not important.

Wireless

CPU type VREF level Description

GS64 1.8V RBIAS, RTH nom values should be the same.

GR64001 2.8V RBIAS, RTH nom values should be the same.

GR64002 1.8V to 2.8V RBIAS, RTH nom values should be the same.

GR64002 >2.8V to 5.0V

The value of RBIAS should be selected so that the

voltage level on ADIN1 does not exceed 2.5V at

any extreme temperature.

There are four temperatures that must be calibrated (low, resume_low, resume_high,

high).

Temp mode Temp

(°C) Description

low 0

Low temperature limit. Charging will be suspended if

temperature goes below this limit.

resume_low +4

Charging resume level. After the low limit has been

reached, charging will not resume until temperature

exceeds this level.

resume_high +36

Charging resume level. After the high limit has been

reached, charging will not resume until temperature

is below this level.

high +40

High temperature limit. Charging will be suspended

if temperature goes above this limit.

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2.2.2 Software Implementation

A charging algorithm for Li-Ion batteries is implemented in the GR/GS64 software.

When a CPS is detected, the charging algorithm becomes enabled. The battery

temperature is then measured continuously on ADIN1 with a sampling duty cycle rate

of approximately 450ms.

If the CPS is removed, the CPS-availability polling is aligned with the paging channel

(DRX-mode) to minimise current consumption. This will affect the time it takes to

detect a CPS, since in worst case it will only be sampled once every 2.1s (2118 ms).

2.2.2.1 How to calibrate the Thermistor ADC-values

The application will have to set the ADC-values for 0°C, +4°C, +36°C and +40°C. To

permanently program these four levels into the Wireless CPU the following sequence

should be performed for each temperature:

•Place the whole application (or only the battery with the included Thermistor)

into a temperature chamber. Power on the application and the Wireless CPU.

•Set the temperature of the chamber to the desired level. After the set

temperature has been reached, let the device soak until the temperature of the

whole device is stable.

•Read the ADC-value of ADIN1 by sending AT*E2IO=0,”AD1”. Record the

received value when it is stable.

When the ADC-value for all four temperatures have been recorded they need to be

stored in NVM by sending “AT*EBATTCNF=1,<0°C value>,<+4°C value>,<+36°C

value>,<+40°C value>”. The values are permanently stored to NVM when

AT*EBATTCNF is issued, but a Wireless CPU restart is required to begin utilising the

newly stored parameters.

If the application has implemented its own temperature protection

circuitry the built-in thermistor table can be disabled by setting the

values to extreme levels (AT*EBATTCNF=1,0,0,1023,1023). It should

be noted that any battery safety circuitry indicated by battery vendor

must be implemented.

DANGE

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