L3916AD datasheet(3/15 Pages) STMICROELECTRONICS

Part #	L3916AD

Description	SPEECH AND 14 MEMORY DIALER WITH LED DRIVER

Download	15 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

3 / 15 page

A valid keypad entry is either a single Row con-

nected to a single Column or GND simultaneously

presented to both a single Row and a single Col-

unm.

In its quiescent or standby state, during normal

off-hook operation, either the Rows or the Col-

umns are at logic level 1 (VDD). Pulling one input

low enables the on chip oscillator. Keyboard

scanning then begins.

Scanning consists of Rows and Columns alter-

nately switching high through on chip pullups. Af-

ter both a Row and Column key have been de-

tected, the debounce counter is enabled and any

noise (bouncing contacts, etc) is ignored for a de-

bounce period (TKD) of 32ms. At this time, the

keyboard is sampled and if both the Row and Col-

umn information are valid, the information is buff-

ered into the LND location. After scanning starts,

the row and column inputs will assume opposite

states.

In the tone mode, if two or more keys in the same

row or if two or more keys in the same column are

depressed a single tone will be output. The tone

will corresponds to the row or column for which

the two keys were pushed. This feature is for test-

ing purposes, and single tone will not be redialed.

Also in the tone mode, the output tone is continu-

ous in the manual dialing as long as the key is

pushed. The output tone duration follows the Ta-

ble 1. When redialing in the tone mode, each

DTMF output has 100ms duration, and the tone

separation (inter signal delay) is 100ms.

Table 1: Output Tone Duration

Key-Push Time, T

Tone Output

T<= 32ms

32ms < = T < = 100ms +

Tkd

T > = 100ms + Tkd

No output, ignored by

one chip phone.

100ms Duration

Output Duration = T - Tkd

OSC

Output. Pin 5. Only one pin is needed to connect

the ceramic resonator to the oscillator circuit. The

other end of the resonator is connected to GND

(pin 8). The nominal resonator frequency is

3.579545MHz and any deviation from this stand-

ard is directly reflected in the Tone output fre-

quencies. The ceramic resonator provides the

time reference for all circuit functions. A ceramic

resonator with tolerance of

±0.25% is recom-

mended

PULSE

Output. Pin 6. This is an output consisting of an

open drain N-Channel device. During on-hook,

pulse output pin is in high impedance and once off-

hooked, it will be pulled high by external resistor.

MODE/PACIFIER TONE

Input (MODE). Pin 7. MODE determines the di-

aler’s default operating mode. When the device is

powered up or the hookswitch input is switched

from on-hook (VDD) to off-hook (GND), the default

determines the signalling mode. A VDD connec-

tion defaults to tone mode operation and a GND

connection defaults to pulse mode operation.

When dialing in the pulse mode, a softswitch fea-

ture will allow a change to the tone mode when-

ever the * key is depressed. Subsequent * key in-

puts will cause the DTMF code for an * to be

dialed.. The softswitch will only switch from pulse

to tone. After returning to on-hook and back to off-

hook, the phone will be in pulse mode. Redial by

the LND key or the MEM key will repeat the soft-

switch.

Output (PACIFIER TONE). Pin 7. In pulse mode,

all valid key entries activate the pacifier tone. In

tone

mode, any non DTMF entry (FLASH,

PROG, PAUSE, LND, MEM, E1, E2 and E3), acti-

vates the pacifier tone. The pacifier tone provides

audible feedback, confirming that key has been

properly entered and accepted. It is a 500Hz

square wave activated upon acceptance of valid

key input after the 32ms debounce time. The

square wave terminates after a maximum of

75ms or when the valid key is no longer present.

The pacifier tone signal is simultaneously sent to

earphone and the buzzer. The buzzer can be re-

moved without affecting this function.

HKS

Input. Pin 8. This is the hookswitch input to the one

chip phone. This is a high impedance input and

must be switched high for on-hook operation or low

for off-hook operation. A transition on this input

causes the on chip logic to initialize, terminating

any operation in progress at the time. The signaling

mode defaults to the mode selected at pin 7. Fig-

ures 1 and 2 illustrate the timing for this pin.

GND

Pin 9 is the negative line terminal of the device.

This is the voltage reference for all specifications.

RXOUT, GRX, RXIN

RXOUT (pin 10), GRX (pin 11) and RXIN (pin 12).

The receive amplifier has one input RXIN and a

non inverting output RXOUT. Amplification from

RXIN to RXOUT is typically 31dB and it can be

adjusted between 11dB and 41dB to suit the sen-

sitivity of the earphone used. The amplification is

proportional to the external resistor connected be-

tween GRX and RXOUT.

FUNCTION PIN DESCRIPTION (continued)

L3916A - L3926A - L3936A

3/15

Similar Part No. - L3916AD

Manufacturer	Part #	Datasheet	Description
STMicroelectronics	L3916AD	124Kb / 14P	SPEECH AND 14 MEMORY DIALER WITH LED DRIVER

More results

Similar Description - L3916AD

Manufacturer	Part #	Datasheet	Description
STMicroelectronics	L3916A	124Kb / 14P	SPEECH AND 14 MEMORY DIALER WITH LED DRIVER
STMicroelectronics	L3914A	188Kb / 15P	SPEECH AND 14 MEMORY DIALER WITH HOLD FUNCTION
Samsung semiconductor	KA8501A	60Kb / 4P	SPEECH NETWORK WITH DIALER INTERFACE
	S1T8501	61Kb / 6P	SPEECH NETWORK WITH DIALER INTERFACE
	KA8504	55Kb / 4P	SPEECH NETWORK WITH DIALER INTERFACE
	S1T2425A	77Kb / 7P	SPEECH NETWORK WITH DIALER INTERFACE
Sanyo Semicon Device	LC73720	284Kb / 12P	Dialer with Memory?
Samsung semiconductor	KA2425A	91Kb / 6P	SPEECH NETWORK WITH DIALER INTERFACE
STMicroelectronics	ST3917A	181Kb / 16P	SPEECH - TONE/PULSE DIALER - LED INDICATOR July 1996
Winbond	W91473	236Kb / 20P	14-MEMORY TONE/PULSE SWITCHABLE DIALER WITH HANDFREE AND LOCK FUNCTION

More results

L3916AD Datasheet(PDF) 3 Page - STMicroelectronics

L3916AD Datasheet(HTML) 3 Page - STMicroelectronics

Similar Part No. - L3916AD

Similar Description - L3916AD

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Datasheet Download

Link URL