TEA1069 datasheet(22/44 Pages) PHILIPS

22 / 44 page

1998 Jan 08

Philips Semiconductors

Product speciﬁcation

Versatile speech/dialler/ringer with

music-on-hold

TEA1069; TEA1069A

KEY TONE: PIN KT/EARTH

Every time a valid key is pressed a keytone is generated

with a frequency of 606 Hz and a duration of 30 ms. This

function is selected by the diode GOS = off. KT/EARTH is

LOW when VDD is below power-on reset trip level and

when RESET is HIGH.

VOLUME CONTROL: PINS VOL1 AND VOL2

Both pins can control the volume of the ringer and/or the

hands-free circuit. The state of VOL1/VOL2 is controlled

by a state machine as depicted in Fig.24.

VOL1 and VOL2 are push-pull outputs. Both are set LOW

when VDD is below power-on reset trip level and when

RESET is HIGH.

MUSIC-ON-HOLD: PIN MOH/DMO

When the dialler is in the hold state (see Fig.23) a melody

is generated via pin TONE. In this state pin MOH/DMO can

be used via diode GOS = off as an enable signal for the

hardware to indicate that the tone should be switched to

the telephone line.

MOH/DMO is a push-pull output. It is set LOW when VDD

is below power-on reset trip level and when RESET is

HIGH.

HANDS-FREE: PIN HF

During the on-line state, the hands-free output pin HF is

used for enabling the hands-free hardware. The pin will

change state depending on specific key-sequences

(see Fig.23).

HF is a push-pull output. It is set LOW when VDD is below

power-on reset trip level and when RESET is HIGH.

HOLD MODE: PIN HOLD

One way to terminate the hold state (see Fig.23) is a

change in state of the signal at pin HOLD. This input

should reflect the line current. If current is flowing the

signal at pin HOLD should be HIGH, if not it should be

LOW.

This pin is not debounced. The signal applied should be

filtered by the hardware. HOLD is HIGH when VDD is below

power-on reset trip level and when RESET is HIGH.

Key sequences

The behaviour of the TEA1069 and TEA1069A can be

modelled as a State Transition Diagram (STD) shown in

Fig.21.

Fig.21 TEA1069 and TEA1069A dialler/ringer states.

handbook, full pagewidth

MBH209

STANDBY

power-on

ON-LINE

RINGER

on-hook/[HOOK]

off-hook/[HOOK]

ringer signal

ringer invalid

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