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PDF HT9205C Data sheet ( Hoja de datos )
| Número de pieza | HT9205C | |
| Descripción | 5-Memory/6-Memory Tone/Pulse Dialer | |
| Fabricantes | Holtek Semiconductor | |
| Logotipo |  |
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HT9205A/B/C/D/K
5-Memory/6-Memory Tone/Pulse Dialer
Features
• Universal specification
• Operating voltage: 2.0V~5.5V
• Low stand-by current
• Low memory retention current: 0.1µA (Typ.)
• Tone/pulse switchable
• Interface with LCD driver
• 32 digits for redialing
• 32 digits for the SA memory dialing
• One-key redialing
• Pause and P→T key for PBX
• 4×5 keyboard matrix
• 3.58MHz crystal or ceramic resonator
• Hand-free control
• Hold-line control
• Pause, P→T can be saved for redialing
• Resistor options:
– M/B ratio
– Flash function and flash time
– Pause and P→T duration
– Pulse number
– Keyboard form
• Memory number:
– HT9205A/B/C/D: 5 memories
– HT9205K: 6 memories
General Description
The HT9205 series tone/pulse dialers are CMOS
LSIs for the telecommunication system. They are
designed to meet various dialing specifications
through resistor options matrix.
The HT9205 series tone/pulse dialers are of-
fered in various packages from 18 DIP to 24
SDIP. The 18 DIP version is suitable for low cost
applications, while the 24 SDIP version sup-
plies versatile functions such as: Hold-line,
Hand-free and LCD dialing number display in-
terface, all of which are suitable for feature
phone applications.
Selection Table
1 16th June ’95
1 page  
HT9205A/B/C/D/K
Pin Name
I/O
Internal
Connection
Description
MODE
This is a three-state input/output pin, provided to the user for
selecting a dialing mode among Tone/20pps/10pps.
MODE=VDD: Pulse mode, 10pps.
I/O
CMOS
IN/OUT
MODE=OPEN: Pulse mode, 20pps.
MODE=VSS: Tone mode.
During the pulse mode dialing, switching this pin to the tone
mode changes the following entrance of digits to the tone
mode. When the chips are working in the tone mode, the
switching from tone to the pulse mode will be recognized.
DTMF
This pin is active only when the chip transmits tone dialing
O
CMOS OUT
signals. Otherwise, it always outputs low. The pin outputs
tone signals to drive the external transmitter amplifier circuit.
The load resistor should not be less than 5KΩ.
HDI
This pin is a schmitt trigger input structure. Active low.
I
CMOS IN
Pull-High
Applying a negative going pulse to this pin can toggle the HDO
output once.
An external RC network is recommanded to use for the input
debouncing. The pull-high resistance is 200KΩ typically.
HDO
The HDO is a CMOS output structure. Its output is toggle-
controlled by a negative transition on HDI. When HDO is
toggled to high, PO keeps high to hold the line. The hold
O
CMOS OUT
function can be released by setting HFO high or by an on-off
hook operation or by another HDI input. The HDO pin can
directly drive the HT3810 series melody generator to produce
hold-line back ground melody. Refer to the functional
description for the hold-line function.
This pin is a schmitt trigger input structure. Active high.
Applying a positive going pulse to HFI can toggle the HFO
HFI
I
CMOS IN
Pull-Low
once and hence control the hand-free function. The pull-low
resistance of HFI is 200KΩ typically.
An external RC network is recommanded to use for the input
debouncing.
HFO
The HFO is a CMOS output structure. Its output is toggle-
controlled by a positive transition on the HFI pin. When HFO is
high, the hand-free function is enabled and PO outputs high to
O
CMOS OUT
connect the line.
The hand-free function can be released by an on-off-hook
operation or by another HFI input or by setting HDO high.
Refer to the functional description for the hand-free functional
operation.
DOUT
This is an NMOS open drain output pin. It outputs the BCD
O
NMOS OUT
code of the dialing digits to the LCD driver chip (HT16XX
series) or µC for dialing number display. Refer to the
functional description for the detailed timing.
5 16th June ’95
5 Page 
Pulse number table
Keypad
Output Pulse Number
Digit Key
Normal
N
New
Zealand
(10–N)
Sweden/
Denmark
(N+1)
1 19 2
2 28 3
3 37 4
4 46 5
5 55 6
6 64 7
7 73 8
8 82 9
9 9 1 10
0 10 10 1
∗/T
P→T
P→T
P→T
# Ignored Ignored Ignored
Tone duration and pause in redial function
• HT9205A/B/C/D
Parameter Symbol Typ. Unit
Minimum Tone
Duration
TTMIN 82.5 ms
Minimum Inter-
tone Pause
TITPM
85.5
ms
Cycle Time
TC 168 ms
• HT9205K
Parameter
Minimum Tone
Duration
Minimum Inter-
tone Pause
Cycle Time
Symbol Typ.
TTMIN 100
TITPM
TC
106
206
Unit
ms
ms
ms
HT9205A/B/C/D/K
Hand-free function operation
• Hand-free function execution
When HFO is low, a rising edge triggers the
HFI, asserting 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 rising edge to HFI
– Changing the HDO pin from low to high
• Hand-free function table
Hold-line function operation
• Hold-line function execution
When HDO is low, a falling edge triggers the
HDI, asserting the Hold-line function (HDO
becomes high). The XMUTE remains low
when HDO is high.
• Reset Hold-line function
When HDO is high, the Hold-line function is
enabled and can be reset by:
– Off-hook
– Applying a falling edge to HDI
– Changing the HFO pin from low to high
11 16th June ’95
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet HT9205C.PDF ] | |
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