AS2525Q datasheet(4/27 Pages) AMSCO

Part #	AS2525Q

Description	Single-Chip Handsfree Phone CMOS Integrated Circuit

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Manufacturer	AMSCO [ams AG]

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Datasheet AS2525

austriamicrosystems

Revision 2.1

Page 4 of 27

Pin #

Symbol

Type

Description

43

DO

Data Output

Data output of 3-wire bus.

A 100 k

Ω resistor connected from this pin to VSS enables key locking.

If signal is not activated, a pull down resistor (100 k

Ω) is inserted.

44

CS1

DO

Chip Select 1

Chip select signal for external EEPROM.

If signal is not activated, a pull down resistor (100 k

Ω) is inserted.

DI:

Digital Input

DO:

Digital Output

DI/O:

Digital Input/Output

AI:

Analogue Input

AO:

Analogue Output

AI/O:

Analogue Input/output

Basic Definitions

Password is set to 0123 and is used to access basic

parameter settings (see Table 3: Parameter settings). The

set-up programming is normally done in the factory during

manufacturing of the telephone sets. The factory settings

can be loaded into the EEPROM (see Figure 3: Memory

allocation for external EEPROM).

PIN code is default set to 1111 and is used by the user to

protect certain user settings (see Table 5: User

programming with PIN code). The PIN code can be

changed by the user.

Default settings are shown in bold.

Program procedures are entered with the [PG] key.

Pressing any invalid key or going on-hook during

programming will abort the program mode and no changes

will be stored. Ending a program procedure by pressing the

[PG] key will store the changes and exit the program mode.

Keyboard Layout

C4

C3

C2

C1

4

2

0

7

5

3

∗∗∗∗

8

69

MR

R/P

FL

M5

1

M6

PG

V+

M7

V-

M8

#

M1

M2

M3

M4

SH

R1

R2

R3

MT

Figure 1: Keyboard Layout

Maximum RON for key closure: 1 k

Ω

Minimum ROFF for open key: 1 M

Ω

See “Table 1: Key definitions” for description of key

functions

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