AS2525B austriamicrosystems, AS2525B Datasheet - Page 14

• Manufacturer Part Number: AS2525B
• Description: IC, SINGLE CHIP HANDS FREE PHONE, TQFP44
• Manufacturer: austriamicrosystems

Specifications of AS2525B

• Audio Control Type: Volume
• Output Power: 500mW
• Control Interface: Serial
• Control / Process Application: Volume Control For Earpiece & Loudspeaker
• Supply Voltage Range: 3V To 5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Datasheet AS2525
Dialing and Control Functions
Valid Keys
The key scanning is enabled in off-hook mode with V
above V
connecting the appropriate row to the column (R
k ). This can be done using an n x m keyboard matrix with
single contacts. Three diodes and a resistor are used to
extend the number of rows (see Figure 1: Keyboard
Layout).
PIN Code
A PIN code is available for protecting various user
settings. The default PIN code is set to 1111 and can be
change as follows:
It is also possible to reset the PIN code through set-up
programming:
Call Restriction
A call restriction function is accommodated. This function
can be activated using the PIN code. One or two digits can
be programmed to inhibit dialing starting with said digit(s).
If first digit(s) of a manual entered number or a number
retrieved from a memory matches the content of the call
restriction memory, dialing will be inhibited.
Storing digits for call restriction:
Revision 2.1
1. Press [PG] to enter program mode
2. Press [1] + (PIN) + [0]
3. Key in new PIN code (valid digits: 0 - 9, #)
4. Key in new PIN code again
5. Press [PG] (= store and exit) or go on-hook to
1. Press [PG] to enter program mode
2. Press [0] + (Password) + [#] + [0]
3. Press [1] to reset
4. Press [PG] (= store and exit) or go on-hook to
1. Press [PG] to enter program mode
2. Press [1] + (PIN) +
3. Press [1] for entering first digit of call restriction
4. Key in digit for call restriction
5. Press [PG] (= store and exit) or go on-hook to
REF
abort
abort
or [2] for entering second digit
abort.
. A valid key is detected from the keyboard by
ON
< 1
DD
Example 1:
Prohibit all calls with numbers starting with 0.
Activate: [PG] + [1] + (PIN) + [1] + [0] + [PG]
Deactivate: [PG] + [1] + (PIN) + [1] + [MT] + [PG]
Example 2:
Prohibit all calls with numbers starting with 09 (numbers
starting with 00…, 01…, etc. will be allowed; pauses will be
ignored, i.e. numbers starting with 0 PS 9 … will be
prohibited).
Activate: [PG] + [1] + (PIN) + [1] + [0] + [PG] + [PG] + [2] +
(PIN) + [1] + [9] + [PG]
Deactivate: [PG] + [1] + (PIN) + [1] + [MT] + [PG] + [PG] +
[2] + (PIN) + [1] + [MT] + [PG]
Pressing the [MT] key in place of the digit during
programming will cancel said call restriction. The first and
second digit can be stored, changed or deleted
independent of each other.
Key Lock
A key lock function is provided to allow the user to protect
the telephone from any misuse. When this function is
available through the set-up programming, it is possible to
enable/disable the key lock using the user PIN code.
Enabling/disabling key lock:
Also an easy key lock function is provided. This function
can be activated/deactivated when the key lock function is
available through set-up programming and the previous
mentioned key lock through PIN code is disabled.
Clear Memory Procedure
It is possible to clear all stored numbers by using the PIN
code as follows:
1. Press [PG] to enter program mode
2. Press [1] +(PIN) + [#] + [6]
3. Press [1] for enable or [0] for disable
4. Press [PG] (= store and exit) or go on-hook to
1. Press [PG] to enter program mode
2. Press [1] + (PIN) + [#] + [7]
3. Press [1] for clear
abort
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