Telit Wireless Solutions GE863-QUAD Pb free Manual de instalación

Telit GE863-QUAD / GE863-PY

Hardware User guide

1vv0300715, Rev. ISSUE#0, - 21/02/06

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Telit GE863-QUAD / GE863-PY

Hardware User guide

1vv0300715, Rev. ISSUE#0, - 21/02/06

Contents

1OVERVIEW 5

2HARDWARE COMMANDS 6

2.1 Turning ON the GE863-QUAD/PY 6

2.2 Turning OFF the GE863-QUAD/PY 8

2.2.1 Hardware shutdown 8

2.3 Hardware Unconditional Reboot 8

3POWER SUPPLY 10

3.1 Power Supply Requirements 10

3.2 General Design Rules 11

3.2.1 Electrical design Guidelines 11

3.2.1.1 + 5V input Source Power Supply Design Guidelines 11

3.2.1.2 + 12V input Source Power Supply Design Guidelines 13

3.2.1.3 Battery Source Power Supply Design Guidelines 14

3.2.1.4 Battery Charge control Circuitry Design Guidelines 14

3.2.2 Thermal Design Guidelines 16

3.2.3 Power Supply PCB layout Guidelines 17

4ANTENNA 18

4.1 GSM Antenna Requirements 18

4.2 GSM Antenna - PCB line Guidelines 19

4.3 GSM Antenna - installation Guidelines 20

5SERIAL PORTS 20

5.1 MODEM SERIAL PORT 20

5.2 MODEM SERIAL PORT 2 (DEBUG) 22

5.3 RS232 level translation 23

5.4 5V UART level translation 25

Telit GE863-QUAD / GE863-PY

Hardware User guide

1vv0300715, Rev. ISSUE#0, - 21/02/06

6MICROPHONE 27

6.1 Microphone line Characteristic and requirements 27

6.2 General Design Rules 30

6.3 Microphone Biasing 30

6.3.1 Balanced Microphone biasing 31

6.3.2 Unbalanced Microphone biasing 33

6.4 Microphone buffering 34

6.4.1 Buffered Balanced Mic. 34

6.4.2 Buffered Unbalanced (Single Ended) Mic. 37

7SPEAKER 40

7.1 Speaker lines characteristics and requirements 40

7.2 General Design rules 42

7.2.1 Noise Filtering 43

7.3 Handset earphone design 43

7.4 Hands Free earphone (low power) design 45

7.5 Car Kit speakerphone design 45

8GENERAL PURPOSE I/O 47

8.1 Using a GPIO pad as INPUT 47

8.2 Using a GPIO pad as OUTPUT 47

8.3 Using the Alarm Output GPIO6 48

8.4 Using the Buzzer Output GPIO7 48

9CAMERA 49

9.1 Transchip Camera 49

9.1.1 Camera interface connectors 49

9.1.2 EVB for Transchip camera support 52

9.1.3 Block Diagram for supported cameras 53

9.1.4 Schematic Diagrams for supported cameras 54

9.1.5 Example usage script for camera 55

Telit GE863-QUAD / GE863-PY

Hardware User guide

1vv0300715, Rev. ISSUE#0, - 21/02/06

10 CONFORMITY ASSESSMENT ISSUES 57

11 SAFETY RECOMMANDATIONS 59

DOCUMENT CHANGE LOG 61

12 EVK 2 SCHEMATICS 62

13 EVB CAMERA SCHEMATICS 68

Telit GE863-QUAD / GE863-PY

Hardware User guide

1vv0300715, Rev. ISSUE#0, - 21/02/06

1 Overview

The aim of this document is the description of some hardware solutions useful for developing a

product with the Telit GE863-QUAD/PY module.

In this document all the basic functions of a mobile phone will be taken into account; for each

one of them a proper hardware solution will be suggested and eventually the wrong solutions and

common errors to be avoided will be evidenced. Obviously this document cannot embrace the

whole hardware solutions and products that may be designed. The wrong solutions to be avoided

shall be considered as mandatory, while the suggested hardware configurations shall not be

considered mandatory, instead the information given shall be used as a guide and a starting point

for properly developing your product with the Telit GE863-QUAD/PY module. For further

hardware details that may not be explained in this document refer to the Telit GE863-QUAD/PY

Product Description document where all the hardware information is reported.

NOTICE

The information presented in this document is believed to be accurate and reliable. However, no responsibility is

assumed by Telit Communication S.p.A. for its use, nor any infringement of patents or other rights of third parties

which may result from its use. No license is granted by implication or otherwise under any patent rights of Telit

Communication S.p.A. other than for circuitry embodied in Telit products. This document is subject to change

without notice.

Telit GE863-QUAD / GE863-PY

Hardware User guide

1vv0300715, Rev. ISSUE#0, - 21/02/06

2 Hardware Commands

2.1 Turning ON the GE863-QUAD/PY

To turn on the GE863-QUAD/PY the pad ON# must be tied low for at least 1 second and then

released.

The maximum current that can be drained from the ON# pad is 0,1 mA.

A simple circuit to do it is:

NOTE: don't use any pull up resistor on the ON# line, it is internally pulled up. Using pull up resistor

may bring to latch up problems on the GE863-QUAD/PY power regulator and improper power on/off

of the module. The line ON# must be connected only in open collector configuration.

NOTE: In this document all the lines that are inverted, hence have active low signals are labeled

with a name that ends with a "#" or with a bar over the name.

NOTE: The GE863-QUAD/PY turns fully on also by supplying power to the Charge pad (provided

there's a battery on the VBATT pads).

ON#

Power ON impulse

GND

Telit GE863-QUAD / GE863-PY

Hardware User guide

1vv0300715, Rev. ISSUE#0, - 21/02/06

For example:

1- Let's assume you need to drive the ON# pad with a totem pole output of a +3/5 V

microcontroller (uP_OUT1):

2- Let's assume you need to drive the ON# pad directly with an ON/OFF button:

Telit GE863-QUAD / GE863-PY

Hardware User guide

1vv0300715, Rev. ISSUE#0, - 21/02/06

2.2 Turning OFF the GE863-QUAD/PY

The turning off of the device can be done in two ways:

• by software command (see GE863-QUAD/PY Software User Guide)

• by hardware shutdown

When the device is shut down by software command or by hardware shutdown, it issues to the

network a detach request that informs the network that the device will not be reachable any

more.

2.2.1 Hardware shutdown

To turn OFF the GE863-QUAD/PY the pad ON# must be tied low for at least 1 second and then

released.

The same circuitry and timing for the power on shall be used.

The device shuts down after the release of the ON# pad.

TIP: To check if the device has powered off, the hardware line PWRCTL should be monitored. When

PWRCTL goes low, the device has powered off.

2.3 Hardware Unconditional Reboot

To unconditionally Reboot the GE863-QUAD/PY, the pad RESET# must be tied low for at least

200 milliseconds and then released.

The maximum current that can be drained from the ON# pad is 0,15 mA.

A simple circuit to do it is:

RESET#

Unconditional Reboot

impulse

GND

Telit GE863-QUAD / GE863-PY

Hardware User guide

1vv0300715, Rev. ISSUE#0, - 21/02/06

NOTE: don't use any pull up resistor on the RESET# line nor any totem pole digital output. Using

pull up resistor may bring to latch up problems on the GE863-QUAD/PY power regulator and

improper functioning of the module. The line RESET# must be connected only in open collector

configuration.

TIP: The unconditional hardware reboot should be always implemented on the boards and software

should use it as an emergency exit procedure.

For example:

1- Let's assume you need to drive the RESET# pad with a totem pole output of a +3/5 V

microcontroller (uP_OUT2):

Telit GE863-QUAD / GE863-PY

Hardware User guide

1vv0300715, Rev. ISSUE#0, - 21/02/06

3 Power Supply

The power supply circuitry and board layout are a very important part in the full product design

and they strongly reflect on the product overall performances, hence read carefully the

requirements and the guidelines that will follow for a proper design.

3.1 Power Supply Requirements

The GE863-QUAD/PY power requirements are:

• Nominal Supply Voltage: 3.8 V

• Max Supply Voltage: 4.2 V

• Supply voltage range: 3.4 V - 4.2 V

• Max Peak current consumption (impulsive): 1.9 A

• Max Average current consumption during GPRS transmission (rms): 500 mA

• Max Average current consumption during VOICE/CSD transmission (rms): 270 mA

• Average current during Power Saving: ≈4 mA

• Average current during idle (Power Saving disabled) ≈19 mA

The GSM system is made in a way that the RF transmission is not continuous, else it is packed

into bursts at a base frequency of about 216 Hz, the relative current peaks can be as high as about

2A. Therefore the power supply has to be designed in order to withstand with these current peaks

without big voltage drops; this means that both the electrical design and the board layout must be

designed for this current flow.

If the layout of the PCB is not well designed a strong noise floor is generated on the ground and

the supply; this will reflect on all the audio paths producing an audible annoying noise at 216 Hz;

if the voltage drop during the peak current absorption is too much, then the device may even

shutdown as a consequence of the supply voltage drop.

TIP: The electrical design for the Power supply should be made ensuring it will be capable of a peak

current output of at least 2 A.

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