AS2525B austriamicrosystems, AS2525B Datasheet - Page 4

• 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
DI:
DO:
DI/O:
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.
Revision 2.1
Pin #
43
44
Symbol
CS1
Digital Input
Digital Output
Digital Input/Output
DO
Type
DO
DO
D
Data output of 3-wire bus.
A 100 k
If signal is not activated, a pull down resistor (100 k ) is inserted.
C
Chip select signal for external EEPROM.
If signal is not activated, a pull down resistor (100 k ) is inserted.
ata
hip
S
O
elect
utput
resistor connected from this pin to VSS enables key locking.
1
AI:
AO:
AI/O:
Keyboard Layout
Figure 1: Keyboard Layout
Maximum R
Minimum R
See “Table 1: Key definitions” for description of key
functions
MR
M1
M5
V+
C1
1
2
3
Description
OFF
ON
PG
M2
M6
V-
C2
4
5
6
for key closure: 1 k
Analogue Input
Analogue Output
Analogue Input/output
for open key: 1 M
R/P
M3
M7
MT
7
8
9
C3
austriamicrosystems
SH
FL
M4
M8
C4
0
#
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R1
R2
R3