AS2525B datasheet(14/28 Pages) AMSCO

14 / 28 page

Datasheet AS2525

austriamicrosystems

Revision 2.1

Page 13 of 27

Loudhearing

A loudhearing mode can be enabled/disabled through the

set-up programming.

Table 19: Loudhearing mode selection

[PG] + [0] + (Password) + [#] + [7] + (digit) + [PG

]

Digit

Loudhearing

[0]

Enabled (LH + HF provided)

[1]

Disabled (only HF is provided)

Headset mode

Head set mode is selected by connecting pin "HEAD" to

VDD and enabling the head function by service code

programming (see also Table 3: Parameter settings).

Table 20: Headset Tx gain setting

[PG] + [0] + (Password) + [0] + [7] + (x) + [PG]

Key

(x)

Tx Gain (dB)

M1/2 to LS

Key

(x)

Tx Gain (dB)

M1/2 to LS

[0]

[8]

[1]

[9]

[2]

[M1]

[3]

[M2]

[4]

[M3]

[5]

[M4]

[6]

[M5]

[7]

[M6]

Table 21: Headset Rx gain setting

[PG] + [0] + (Password) + [0] + [8] + (x) + [PG]

Key

(x)

Rx Gain (dB)

LS to RO

Key

(x)

Rx Gain (dB)

LS to RO

[0]

-6

[8]

[1]

-5

[9]

[2]

-4

[M1]

[3]

-3

[M2]

[4]

-2

[M3]

[5]

-1

[M4]

[6]

[M5]

[7]

[M6]

If this mode is entered both hook inputs HS and HF act as

electronic off-hook for handset operation. The gain in

transmit and receive can be programmed by service code

programming. The pin "HEAD" is only scanned once after

off-hook and any change on this pin during one session will

be ignored.

Ring Frequency Detection

The ring frequency detector assures that only signals with

a frequency between 13 Hz and 70 Hz are regarded as

valid ring signals.

When a valid ring signal is present for 100 ms

continuously, the melody generator is activated and

remains active as long as the ring signal is present.

Once the melody generator has been started, the ring

signal is continuously monitored and the melody generator

is instantly turned on or off according to the momentary

presence of a valid or invalid ring signal respectively (until

next POR or off-hook).

DC/DC converter

When a valid ring signal is detected, the dc/dc converter is

started.

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