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參數(shù)資料
| 型號： | NT95089 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Tone Dialer |
| 中文描述： | 撥號音 |
| 文件頁數(shù)： | 5/11頁 |
| 文件大?。?/td> | 309K |
| 代理商： | NT95089 |
NT95089
5
Pin Description
Pin No.
Designation
Description
1
6
VDD
VSS
Positive power supply input
Negative power supply input
The NT95089 is designed to operate within a range of 2.5V to 10.0V.
2
CE
Chip enable input
The chip enable input has an internal pullup to VDD. When this input is
left unconnected or connected to VDD, the NT95089 operates normally.
When this input is connected to VSS, tone generation is inhibited;
however, all other chip functions continue to operate normally.
3 - 5, 9
11 - 14
C1
-
C4
R4
-
R1
Keyboard inputs
Internal pullup resistors are present on the row and column inputs
(20K
- 10K
); low levels on a particular row and column input
correspond to a key entry.
The NT95089 interfaces with the standard push-button telephone
keyboard (see Figure 1).(Keyboard common terminal must be connected
to VSS).
7
8
OSCI
OSCO
Oscillator input
Oscillator output
The NT95089 contains an oscillator circuit with the necessary parasitic
capacitances and feedback resistor on chip, making it necessary to
connect only a standard 3.58MHz TV crystal across the OSCI and
OSCO terminals to implement the oscillator function. The oscillator is
enabled whenever a row input is activated.
10
AKD
Any key down output
The
AKD
output consists of an open drain N-channel device. When no
keys are pressed, the
AKD
output is open. When a key is pressed, the
AKD
output = VSS.
15
STI
Single tone inhibit input
The
STI
input is used to inhibit the generation of tones other than dual
tones. It has an internal pull-down to VSS. When this input is left
unconnected or connected to VSS, the SINGLE TONE mode is disabled.
When this input is connected to VDD, single as well as dual tones may
be generated as follows:
DUAL TONE mode: When one row and one column are selected, a dual
tone output consisting of an appropriate low group tone and high group
tone is generated. If two digit keys that are not in the same row or same
column are pressed, the dual tone mode is disabled and no output is
provided.
SINGLE TONE mode: Low group tones can be generated by pressing
two digit keys in the appropriate row. High group tones can be generated
by pressing two digit keys in the appropriate column, i.e., selecting the
appropriate column input and pressing two row inputs in that column.
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|---|---|
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