ERICSSON CA638, CF688 Technical Description CHAP3
LZB 115 2508 R1A Technical Descrip ti on
Chapter 3 -Technical Description
Introduction
This chapter describes the technical description and functionality of the CA638 and the CF688 Cellular
Phones.
Features
The CA638 and the CF688 Cellular Phones share the following features:
• 17 key keypad
• System select function with preferred network memory
• Phone security func t i on s:
- SIM with cardlock
- Phone lock option
- Call restrict option
- Keypad lock
- Fixed dialing option
• Four display language options:
- English
-French
-Spanish
- Auto Alternative
• Different ring levels
• Alarm function with snooze option
• AnyKey and Auto answer modes
• Call forward
• Call waiting
• Voice mail
• Call time/cost display
• Calculator
• Conference calling
• Two voice line options (Alternate Line Service)
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Technical Description LZB 115 2508 R1A
• 15 last dialed number memory
• 5 number last received memory
• Unanswered call identification
• Send identification option
• Microphone mute
• Scratch pad display
• DTMF capabilities
• Enhanced Speech Quality (EFR)
The CA638 and the CF688 differ in the following areas:
• The CA638 has an interchangeable front keypad cover.
• The Keypa d layout is different for the two phones. See Figure 3-2
and Figure 3-3.
• The CF688 has a larger display area.
• The CF688 includes side volume keys.
• The CF688 includes an active flip.
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LZB 115 2508 R1A Technical Descrip ti on
External Components
This section describes the external components of the CA638 and the CF688 Cellular Phones. Figures are
included to identify relevant areas of the phone, and tables explain the function of each component. The
following information is included:
• Figure 3-1
• Figure 3-2
• Figure 3-3
• Figure 3-4
• Figure 3-1
and Table 3-1: External Components of the CA638
and Table 3-2: External Components of the CF688
and Table 3-3: Keypad Components
and Table 3-4: LCD display areas
, Figure 3-2, and Table 3-5: Top Indicator Functions
Figure 3-1. CA638 External Components
NOTE
The rear panel of both version phones is the same. See Figure 3-2.
Table 3-1. CF638 External Components
Fig.
Ref.
1 Antenna
2 Indicator Light
3 Earpiece
4Display
5 Keypad
6 System Connector
7 Microphone
8 Exchangeable Front Panel
Description
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Technical Description LZB 115 2508 R1A
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Figure 3-2. CF688 External Components
Table 3-2. CF688 External Components
Fig.
Ref.
Description
1 Antenna
2 Indicator Light
3 Earpiece
4Display
5 Keypad
6 Active Flip
7 Microphone
8 Side Volume Keys
9 External Antenna Connector
10 SIM Card and Holder
11 Warranty Label
LZB 115 2508 R1A Technical Descrip ti on
Keypad
See Figure 3-3. The ke ypad is controlled by JOSEFIN and consists of a key switch matrix with four output
columns and five return input rows. Pressing a key generates an interrupt and allows JOSEFIN to detect
that key.
The key switch matrix will cover a maximum of 20 keys, but 5 additional keys can be added to the input
rows to become detected when connected to ground. This method enables use of the On/Off and Volume
Up/Down switches.
Figure 3-3. Keypad Components
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Technical Description LZB 115 2508 R1A
Table 3-3. Keypad Components
Key Function
Answers incoming calls.
Confirms menu selections and settings.
Accesses quick menu.
Volume control (CA638 only)
Access and navigate thro ugh menu system.
Scroll through text messages.
Turns phone on and off.
Clears displa y i n st a ndby mode.
Cancels menu selections.
Rejects incoming calls.
Mutes phon e.
Erases digits from display.
Returns pho ne to standb y di s pl ay
Terminates input of security codes.
Confirms selections and settings.
Enters characters # and .
Enters characters * and “p” (pause)
Enters numeric characters and text messages.
LCD
See Figure 3-4 and Table 3-4. The Liquid Crystal Display (LCD) is a 3 by 12 character display where each
character is created by a 5 by 7 d ot matrix. Information to and from the LCD is transferred on a single data
line together with a clock signal. Both are provided by JOSEFIN, who also controls the voltage supply to
the LCD by a pulse width modulated (PWM) signal. The voltage supply to the LCD has to be regulated
quite accurately by the logics to obtain optimum performance in the LCD viewing angle and contrast ratio.
JOSEFIN’s software controls the duty cycle (mark/space ratio) of the PWM output.
These digital pulses generate the negative voltage required by the LCD. Because the voltage supplied to the
LCD is most dependent on the load, voltage variations caused by load fluctuations are reduced by feeding
the voltage to an A/D-input of PATTI, where the voltage is checked by software and regulated to match
pre-defined values.
The A/D input of PATTI also provides temperature compensation of the LCD.
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LZB 115 2508 R1A Technical Descrip ti on
Figure 3-4. LCD Display
NOTE
For more information on displays, refer to the CA638 and the CF688 User Manuals.
Table 3-4. LCD Display Areas
Fig.
Ref.
Description
1 Signal Strength Indicator
2
3
4
5
System Indicator
Battery Strength Indicato r
Time
Keylock Indicator
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Technical Description LZB 115 2508 R1A
LEDs
See Figure 3-2 and Table 3-5. The red and gr ee n top LED s are fe d by a no n- flu ctua ti ng su pp ly vo l tage and
are directly controlled by two separate outputs of JOSEFIN. The keypad and LCD illuminations consist of
six and four parallel LEDs, respectively, and are all controlled by a single output from JOSEFIN.
Table 3-5. Top Indicator Functions
Indicator Pattern Function
Slow Blinking Green Phone in standby
Fast Blinking Green Incoming call or message waiting
Blinking Red Low battery warning
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LZB 115 2508 R1A Technical Descrip ti on
Internal Components
This section describes the internal components of the CA638 and the CF688.
• See Figure 3-5
• See Figure 3-6
• See Figure 3-7
and Table 3-6 for CA638 internal component locations and descriptions.
and Table 3-7 for CF688 internal component locations and descriptions.
and Table 3-8 for PCB component layout and descript i on.
Figure 3-5. CA638 Internal Components
Table 3-6. CA638 Internal Components
Fig.
Ref. Description Notes
1 Back Cover
2 Antenna
3 Antenna connector
4 Front Cover Includes microphone and loudspeaker
5 Display assembly Includes Light Guide, LCD, LCD Connector
6 Keypad
7 System connector
8 Warranty Label
9SIM Card Holder
10 SIM Connector
Answers incoming calls, lights display
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Technical Description LZB 115 2508 R1A
.
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Figure 3-6. CF688 Internal Components
LZB 115 2508 R1A Technical Descrip ti on
Table 3-7. CF688 Internal Components
Fig.
Ref. Description Notes
1 Back Cover
2 Antenna
3PCB
See Figure 3-7
and Table 3-8
4 Front Cover
5 Display Assembly Includes Light Guide, LCD, LCD Connector
6 Keypad Answers incoming calls, lights display
7 System Connector
8SIM Card Holder
9 Microphone
10 Microphone Holder
Includes elastomer
11 Active Flip
12 Flip Hinges
13 Side Volume Keys
Dome Foil placed inside front cover assembly
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