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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
·
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-
1-memory Tone/Pulse Dialer
Patent Number: 86474, 84545(R.O.C)
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
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.
1
HT93214 Series
March 15, 2001
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Summary of Contents for Holtek HT93214 Series
- Page 1 HT93214 Series 1-memory Tone/Pulse Dialer Features Patent Number: 86474, 84545(R.O.C) Operating Voltage: 2.0V~5.5V Hand-free control · · Low standby current · · Pause, P ® T can be saved for redialing · Low memory retention current: 0.1mA · One-key redialing (Typ.)
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Page 2: Selection Table
HT93214 Series Selection Table HT93214 series Function Flash Tone Inter Hand- Pulse Flash Time Duration Tone Free Tone Item (ms) (ms) Pause (ms) 300mil HT93214A Control 300/600 10/20 HT93214B Ö Control 300/600 10/20 HT93214AT Control 300/600 10/20 Ö Block Diagram... - Page 3 HT93214 Series Keyboard Information H K S * / T Pin Description Internal Pin Name Description Connection 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...
- Page 4 HT93214 Series Internal Pin Name Description Connection 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.
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Page 5: Absolute Maximum Ratings
HT93214 Series Approximate internal connection circuits C M O S I N C M O S I N / O U T N M O S O U T C M O S I N C M O S O U T... - Page 6 HT93214 Series Test Conditions Symbol Parameter Min. Typ. Max. Unit Conditions =12V XMUTE ¾ ¾ ¾ XMUTE Leakage Voltage No entry ¾ ¾ XMUTE Sink Current 2.5V V =0.5V OLXM XMUTE ¾ 2.5V V =2.5V HKS Pin Input Current ¾...
- Page 7 HT93214 Series Test Conditions Symbol Parameter Min. Typ. Max. Unit Conditions ¾ ¾ 10 pps ¾ Inter-digit-pause Time ¾ ¾ 20 pps ¾ ¾ 10 pps, M/B=1/2 33.3 ¾ Pulse Make Duration ¾ ¾ 20 pps, M/B=1/2 16.7 ¾ ¾...
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Page 8: Functional Description
HT93214 Series Functional Description Keyboard matrix · Reset Hand-free function C1~C3, HKS and R1~R4 form a keyboard ma- When HFO is high, the Hand-free function is trix. Together with a standard 4´4 keyboard, enabled and can be reset by: the keyboard matrix is used for dialing entries. - Page 9 HT93214 Series · · This is a dialing signal key for the tone mode Pause key. The execution of this key pauses only, no response in the pulse mode. the output for the T duration (2.2s). · F1, F2 ·...
- Page 10 HT93214 Series Keyboard Operation The following operations are described under an on-off- hook or on-hook condition with the hand-free active condition. · N o r m a l d i a l i n g P u l s e m o d e...
- Page 11 HT93214 Series · O n e - k e y r e d i a l P u l s e m o d e T o n e m o d e ( a ) w i t h o u t * / T...
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Page 12: Timing Diagrams
HT93214 Series Timing Diagrams Normal dialing · Pulse mode H i g h I m p e d a n c e H K S K E Y I N X M U T E I D P I D P... - Page 13 HT93214 Series Dialing with PAUSE key · Pulse mode H i g h I m p e d a n c e H K S K E Y I N P D P X M U T E I D P...
- Page 14 HT93214 Series · Flash key operation H i g h I m p e d a n c e H K S K E Y I N X M U T E D T M F 6 0 0 H z c a r r i e r 2 0 m s ·...
- Page 15 HT93214 Series · One key redial operation H i g h I m p e d a n c e H K S K E Y I N I T P M I T P M I T P M...
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Page 16: Application Circuits
HT93214 Series Application Circuits O n - h o o k O f f - h o o k March 15, 2001... - Page 17 Holtek reserves the right to alter its products without prior notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw.
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