as2525 austriamicrosystems, as2525 Datasheet - Page 17

• Manufacturer Part Number: as2525
• Description: Single Chip Handsfree Phone Cmos Integrated Circuit
• Manufacturer: austriamicrosystems

Datasheet AS2525
Table 28: Pacifier tone selection
Table 29: Pacifier tones
An invalid key entry will be indicated by a rejection tone of
4 times 40 ms.
By MF dialing the DTMF tones are provided to the earpiece
as comfort tone. The level of the comfort is selected
through the set-up programming.
Table 30: DTMF comfort tone level setting
Revision 2.1
Acknowledge
Reject/Terminate
[9] + [0]
[9] + [1]
[9] + [2]
[9] + [3]
(y + x)
Digit
Key
[PG] + [0] + (Password) + [#] + [9] + (digit) + [PG]
[0]
[1]
[PG] + [0] + (Password) + [0] + (y + x) + [PG]
Key Entry
Pacifier Tone (Key-in Tone)
Disabled
Enabled
Level (dBr)
Earpiece
-36
-30
-24
-18
Frequency
1333 Hz
1333 Hz
[0] + [0]
[0] + [1]
[0] + [2]
[0] + [3]
(y + x)
Key
Loudspeaker
Level (dBr)
4 x 40 ms
Duration
40 ms
-15
-9
-3
3
Serial Bus
The AS2525 incorporates a microwire™ compatible serial
bus (DO, DI, and CLK) with two chip select outputs (CS1
and CS2). The serial bus is used to:
-
-
Table 31: EEPROM read/write timings
See also AS2591 data sheet for further information.
LCD Control
The AS2525 is designed to work together with the LCD
driver AS2591 (see also AS2591 data sheet).
After off-hook (debounced)
After on-hook (debounced)
After first rising edge at FCI
After PG is terminated
After pressing [V+]/[V-]
sending data to the LCD driver (AS2591) when a key is
pressed or a number is dialed out
reading and writing to the external EEPROM under
following conditions:
ACTION
12…600 ms
DURATION
200 ms
50 ms
10 ms
20 ms
Page 17 of 27