Holtek HT93214 Series Manual de usuario

HT93214 Series

1-memory Tone/Pulse Dialer

1 March 15, 2001

Features

·Operating Voltage: 2.0V~5.5V

·Low standby current

·Low memory retention current: 0.1mA

(Typ.)

·Tone/Pulse switchable

·32 (pulse)/31 (tone) digits for redialing

·Pause and P ®T key for PBX

·4´4 keyboard matrix

·3.58MHz crystal or ceramic resonator

·Hand-free control

·Pause, P ®T can be saved for redialing

·One-key redialing

·Keytone output

·Pause time: 2.2s

·Cascadable manual dialing after redialing

·Calibrated DTMF timing for redialing

·HT93214A: 16-pin DIP package

HT93214B/AT: 18-pin DIP package

General Description

The HT93214 are dialer series designed for low

cost telephone set applications with expand-

able features such as Lock function, keytone

and LCD display interface. With a 4´4 key-

board, it performs normal tone/pulse switch-

able dialing, and provides one-key redialing

function with a 32-digit memory for speed dial-

ing. An on-chip oscillator is built-in to work

with an external 3.58Mhz crystal or ceramic

resonator for accurate timing. The HT93214

provides 300ms (F1 key) and 600ms (F2 key) of

flash time; Tone dialing and 10pps, 20pps selec-

tion with 1/2 M/B ratio for pulse dialing.

Patent Number: 86474, 84545(R.O.C)

Selection Table

HT93214 series

Function

Item

Hand-

Free

Key

Tone Flash

Flash

Time

(ms)

Pulse

No.

Tone

Duration

(ms)

Inter

Tone

Pause (ms)

pps M/B

PKG

DIP

300mil

HT93214A Control 300/600 N 94 96 10/20 1/2 16

HT93214B ÖControl 300/600 N 94 96 10/20 1/2 18

HT93214AT ÖControl 300/600 N 94 96 10/20 1/2 18

Block Diagram

Pin Assignment

HT93214 Series

2 March 15, 2001

HKS

MODE

VSS

VDD

DTMF

XM UTE

HFO

HKS

MODE

VSS

VDD

DTMF

XM UTE

HFI 18

HKS

MODE

VSS

VDD

DTMF

XM UTE

MODEO

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Key

Colu n

FSM

Key

Function

Encoder

C ontrol

WRM

C ounter

ADDRL

Key Row

SRAM

D ebounce

D ivider Clock

G enerator M/B

Flash/M ode

Ti er

C heck

Tone

Encoder

C onverter

Tone

Out

Pulse

Out

DTM F

HFI

MODE

MODEO

XM UTE

R4 Clock

C ontrol

Keytone

G enerator

HKS

HFO

Keyboard Information

Pin Description

Pin Name I/O Internal

Connection Description

C1~C3

R1~R4 I/O CMOS

I/O

These pins along with the HKS form a 4´4 keyboard matrix

which can perform keyboard input detection. When on-hook

(HKS=high) all the pins are set high. While off-hook the column

group (C1~C3) is set low and the row group (R1~R4) remains

high for input detection.

Pressing a key connects a single row to a single column HKS and

actuates the system oscillator that results in a dialing signal out-

put. If more than two keys are pressed at the same time, no re-

sponse occurs. The key-in debounce time is 20ms.

X1 I

OSC

The system oscillator consists of an inverter, a bias resistor and

the necessary load capacitor on chip. Connecting a standard

3.579545MHz crystal or ceramic resonator to the X1 and X2 ter-

minals can implement the oscillator function. The oscillator is

turned off in the standby mode, and is actuated whenever a key-

board entry is detected.

X2 O

XMUTE ONMOS

Open Drain

NMOS open drain structure pulled to VSS during dialing signal

transmission. Otherwise, it is an open circuit. This pin is used to

mute the speech circuit when transmitting the dial signal.

HKS I CMOS

This pin is used to monitor the status of the hook-switch and its

combination with HFI can control the PO pin output to make or

break the line.

HKS=VDD: On-hook state (PO=low). Except for HFI (hand-

free control input), other functions are all

disabled.

HKS=VSS: Off-hook state (PO=high). The chip is in the stand-

by mode and ready to receive the key input.

HT93214 Series

3 March 15, 2001

C1 C2 C3

R1 1

*/T

HKS

Pin Name I/O Internal

Connection Description

PO O NMOS

NMOS open drain output structure, which by receiving the HKS

and HFO signals, control the dialer so as to connect or disconnect

the telephone line.

PO is pulled to VSS when HKS is high (on-hook) and HFO is low.

PO is an open circuit which make the line connection when HKS

is low (off-hook) or HFO is high.

During the off-hook state, this pin also outputs the dialing pulse

train in pulse mode dialing. While in the tone mode, this pin is al-

ways an open circuit.

MODE I/O CMOS

This is a tri-state input/output pin, used for dialing mode selec-

tion, either Tone mode or Pulse mode, 10pps/20pps

MODE=VDD: Pulse, 10pps, M/B=1/2

MODE=Floating: Pulse, 20pps, M/B=1/2

MODE=VSS: Tone.

The MODE selection is checked each time a key input is received.

DTMF O CMOS

This pin is active only when the chip transmits tone dialing sig-

nals. Otherwise, it always outputs a low. The pin outputs tone

signals to drive the external transmitter amplifier circuit. The

load resistor (to VSS) should not be less than 5kWand any DC

load connected to VDD is not allowed.

KT O NMOS

NMOS open drain structure for keytone output. It outputs 34ms

of 600Hz tone burst when any key is pressed in the pulse mode or

when a function key is pressed in the tone mode.

HFI I CMOS

Pulled-high, this pin is a schmitt trigger input structure. Active

low. Applying a negative going pulse to HFI can toggle the HFO

once and hence control the hand-free function. The pull-high re-

sistance of HFI is about 200kWtyp. An external RC network is

recommended for input debouncing.

HFO O CMOS

The HFO pin is a CMOS output structure. Its output is toggle-

controlled by a negative transition on HFI pin. When HFO is

high, the hand-free function is enabled and PO outputs a high to

connect the line.

The hand-free function can be released by an on-off-hook opera-

tion or by another HFI input. Refer to the functional description

for the hand-free functional operation.

VDD ¾¾

Positive power supply, 2.0V~5.5V for normal operation

VSS ¾¾

Negative power supply

MODEO O NMOS NMOS open drain output pin pulled to VSS during tone output

and is an open circuit during pulse output.

HT93214 Series

4 March 15, 2001

Approximate internal connection circuits

Absolute Maximum Ratings

Supply Voltage.................................-0.3V to 6V Storage Temperature.................-50°Cto125°C

Input Voltage .................VSS-0.3V to VDD+0.3V Operating Temperature ..............-20°Cto75°C

Note: These are stress ratings only. Stresses exceeding the range specified under "Absolute Maxi-

mum Ratings" may cause substantial damage to the device. Functional operation of this device

at other conditions beyond those listed in the specification is not implied and prolonged expo-

sure to extreme conditions may affect device reliability.

Electrical Characteristics FOSC=3.5795MHz, Ta=25°C

Symbol Parameter Test Conditions Min. Typ. Max. Unit

VDD Conditions

VDD Operating Voltage ¾¾ 2¾5.5 V

IDD Operating Current 2.5V

Pulse Off-hook

Keypad entry

¾0.2 1 mA

Tone ¾0.6 2 mA

ISTB Standby Current 1V On-hook, no load

No entry ¾¾ 1mA

VRMemory Retention Voltage ¾¾ 1¾5V

IRMemory Retention Current 1V On-hook ¾0.1 0.2 mA

VIL Input Low Voltage ¾¾ VSS ¾0.2VDD V

VIH Input High Voltage ¾¾

0.8VDD ¾VDD V

HT93214 Series

5 March 15, 2001

NMOS OUT

VDD

CMOS IN/OUT CMOS OUT

CMOS IN

Pull-Low

CMOS IN

P u ll-H ig h

CMOS IN

OSCILLATOR

X1 X2

10M

20P 10P

VDD

Symbol Parameter Test Conditions Min. Typ. Max. Unit

VDD Conditions

IXMO XMUTE Leakage Voltage ¾VXMUTE=12V

No entry ¾¾ 1mA

IOLXM XMUTE Sink Current 2.5V VXMUTE=0.5V 1¾¾

IHKS HKS Pin Input Current 2.5V VHKS=2.5V ¾0.1 mA

RHFI HFI Pull- High Resistance 2.5V VHFI=0V ¾200 ¾kW

IOH1 Keypad Pin Source Current 2.5V VOH=0V -4¾-40 mA

IOL1 Keypad Pin Sink Current 2.5V VOL=2.5V 200 400 ¾mA

IOH2 HFO Pin Source Current 2.5V VOH=2V -1¾¾

IOL2 HFO Pin Sink Current 2.5V VOL=0.5V 1¾¾

IOL3 MODEO Sink Current 2.5V VOL=0.5V 0.6 3.5 ¾mA

TFP Pause Time After Flash 2.5V ¾¾

800 ¾ms

TRP One-key Redialing Pause

Time 2.5V ¾¾

800 ¾ms

FOSC System Frequency ¾¾ ¾

3.58 ¾MHz

TDB Key-in Debounce Time 2.5V ¾¾

20 ¾ms

TBRK Break Time For One-key

Redialing 2.5V ¾¾

2.2 ¾s

THKDL Off-hook Delay Time 2.5V 10pps ¾800 ¾ms

20pps ¾500 ¾

Pulse Mode Electrical Characteristics FOSC=3.5795MHz, Ta=25°C

Symbol Parameter Test Conditions Min. Typ. Max. Unit

VDD Conditions

IPOH PO Output Source Current 2.5V VOH=2V -0.2 ¾¾

IPOL PO Output Sink Current 2.5V VOL=0.5V 0.2 0.6 ¾mA

PRPulse Rate ¾

MODE pin is

connected to VDD

¾10 ¾pps

MODE pin is opened ¾20 ¾

M/B Make/Break Ratio ¾¾ ¾

33:66 ¾%

TPDP Pre-digit-pause Time ¾

M/B=33:66 (10 pps) ¾33 ¾ms

M/B=33:66 (20 pps) ¾17 ¾

HT93214 Series

6 March 15, 2001

Symbol Parameter Test Conditions Min. Typ. Max. Unit

VDD Conditions

TIDP Inter-digit-pause Time ¾

10 pps ¾800 ¾ms

20 pps ¾500 ¾

TMPulse Make Duration ¾

10 pps, M/B=1/2 ¾33.3 ¾ms

20 pps, M/B=1/2 ¾16.7 ¾

TBPulse Break Duration ¾

10 pps, M/B=1/2 ¾66.6 ¾ms

20 pps, M/B=1/2 ¾33.3 ¾

TPPause Time ¾¾ ¾

2.2 ¾s

Tone Mode Electrical Characteristics FOSC=3.5795MHz, Ta=25°C

Symbol Parameter Test Conditions Min. Typ. Max. Unit

VDD Conditions

VTDC DTMF Output DC Level ¾No load 0.45VDD ¾0.7VDD V

ITOL DTMF Sink Current 2.5V VDTMF=0.5V 0.1 ¾¾

VTAC DTMF Output AC Level ¾Row group,

RL=5kW0.12 0.155 0.18 Vrms

RLDTMF Output Load 2.5V THD£-23dB 5¾¾kW

ACR Column Pre-emphasis 2.5V Row group=0dB 1 2 3 dB

THD Tone Signal Distortion 2.5V RL=5kW¾-30 -23 dB

TTMIN Minimum Tone Duration ¾Auto-redial ¾94 ¾ms

TITPM Minimum Inter-Tone Pause ¾Auto-redial ¾96 ¾ms

THD (Distortion) (dB) = 20 log ( V1 V2 .... Vn

22 2

+++ /Vi Vh

Vi, Vh: Row group and column group signals

V1, V2, ... Vn: Harmonic signals (BW=300Hz~3500Hz)

HT93214 Series

7 March 15, 2001

HT93214 Series

8 March 15, 2001

Functional Description

Keyboard matrix

C1~C3, HKS and R1~R4 form a keyboard ma-

trix. Together with a standard 4´4 keyboard,

the keyboard matrix is used for dialing entries.

The keyboard arrangement of the HT93214 se-

ries is shown in the Keyboard Information.

Tone frequency

Tone

Name

Output Frequency (Hz) % Error

Specified Actual

R1 697 699 +0.29%

R2 770 766 -0.52%

R3 852 847 -0.59%

R4 941 948 +0.74%

C1 1209 1215 +0.50%

C2 1336 1332 -0.30%

C3 1477 1472 -0.34%

Note: % Error does not contain the crystal fre-

quency drift

Dialing specification selection

·The specifications are selected by the MODE

pin.

MODE Tone/Pulse Dial Rate M/B Ratio

VDD Pulse 10pps 1/2

VSS Tone ¾¾

Floating Pulse 20pps 1/2

·The MODE pin status is checked whenever a

digit key is pressed, however the M/B and

pulse rate are determined at the first key en-

try.

Hand-free function operation

·When HFO is low, a falling edge triggers the

HFI, enabling the Hand-free function (HFO

becomes high).

·Reset Hand-free function

When HFO is high, the Hand-free function is

enabled and can be reset by:

¨Off-hook

¨Applying a falling edge to HFI

·Hand-free function table

Current State Next State

Hook SW HFO Input HFO Dialing?

¾Low HFI ¯High Yes

On hook High HFI ¯Low No

Off hook High HFI ¯Low Yes

On hook ¾of

off-hook Low Yes

Off hook Low on hook Low No

Off hook High on hook High Yes

Flash

Two flash keys are provided, namely F1, F2 for

both series. All the flash key function as control

key with different break duration. Whenever a

flash key is pressed the PO pin will be forced

low for a TFduration and the transmission of

the new digit key inputs will be further delayed

foraT

FP after TF. See the following table for

flash duration selection.

Item F1 F2

HT93214 300ms 600ms

Key definition

·0,1,2,3,4,5,6,7,8,9 keys

These are dialing number input keys for

both the pulse mode and the tone mode oper-

ation.

·*/T

This key executes the P®T function and

waits a TP®Tduration in the pulse mode. On

the other hand, the */T key executes the *

function in the tone mode. The */T key will oc-

cupy one memory digit in either tone or pulse

mode.

HT93214 Series

9 March 15, 2001

·#

This is a dialing signal key for the tone mode

only, no response in the pulse mode.

·F1, F2

Pressing one of the flash keys will force the PO

pin to become low for the TFduration. To

transmit the dial signals of the key input that

are entered after the F key, a wait period TFP

(sec) after PO pin returns from low is pro-

vided.

·P

Pause key. The execution of this key pauses

the output for the TPduration (2.2s).

·R

Redial key. It executes redialing as well as

one-key redial function.

Keyboard Operation

The following operations are described under an on-off- hook or on-hook condition with the hand-free

active condition.

HT93214 Series

10 March 15, 2001

Keyboard input: D 1 D 2 ... D n

- Pulse ode

(a ) w ith o u t */T

D ialing output: D 1 D 2 ... D n

RM: D1 D2 ... Dn

(b ) w ith */T

D ia lin g o u tp u t: D 1 D 2 ... D n T

P®T

D n + 1 ... D

R M : D 1 D 2 ... D n * /T D n + 1 ... D

Tone

Pulse

N o r a l d ia lin g

K e y b o a rd in p u t: D 1 D 2 ... D n */T D n + 1 ...

(a ) w ith o u t */T

D ialing output: D 1 D 2 ... D n

RM: D1 D2 ... Dn

(b ) w ith */T

D ia lin g o u tp u t: D 1 D 2 ... D n * D n + 1 ... D

R M : D 1 D 2 ... D n * D n + 1 ... D

Tone ode

(a ) w ith o u t */T

D ialing output: D 1 D 2 ... D n

R M : U nchanged

R M c o n te n t: D 1 D 2 ... D n

(b ) w ith */T

D ia lin g o u tp u t: D 1 D 2 ... D n T

P®T

D n + 1 ... D

R M : U nchanged

R M c o n te n t: D 1 D 2 ... D n * /T D n + 1 ... D

D ialing output: D 1 D 2 ... D n

R M : U nchanged

R M c o n te n t: D 1 D 2 ... D n

(b ) w ith */T

D ia lin g o u tp u t: D 1 D 2 ... D n * D n + 1 ... D

R M : U nchanged

R M c o n te n t: D 1 D 2 ... D n * /T D n + 1 ... D

- Pulse ode

Tone ode

Pulse

Tone

R edial

K e y b o a rd in p u t: D 1 D 2 ... D n */T D n + 1 ...

(a ) w ith o u t */T

Keyboard input: D 1 D 2 ... D n

Keyboard input: R

N ote: The axi u capacity of the R M e ory is 32 digits. W hen ore than 32 digits are entered,

the signal is trans itted but the redial function is inhibited.

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