MV5087 데이터 시트보기 (PDF) - Unspecified
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MV5087 Datasheet PDF : 6 Pages
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MV5087
PIN FUNCTIONS
PIN
NAME
VDD
2
XMITR
3,4,5,9
Column 1-4
VSS
7,8
OSC In,
OSC Out
10
Mute
11,12,13,14 Row 1-4
15
Single Tone
Inhibit
16
Tone Out
DESCRIPTION
Positive Power Supply
Emitter output of a bipolar transistor whose collector is connected to VDD. With
no keyboard input this output remains at VDD and a keyboard input changes the
output to a high impedance state. The state of Single Tone Inhibit input has no
effect on XMITR output.
These inputs are held at VSS by resistors RC and sense a valid logic level (approx
1/2 VDD) when tied to a ROW input.
Negative Power Supply (OV)
On-chip inverter completes the oscillator when a 3,579545 MHz crystal is
connected to these pins. OSC In is the inverter input and OSC Out is the output.
This CMOS Output switches to VSS with no keyboard input and to VDD with a
keyboard input. This output is unaffected by the state of Single Tone Inhibit.
These inputs are held at VDD by resistors RR and sense a valid logic level (Approx
1/2 VDD) when tied to a column input.
This input has a pull-up resistor to VDD and when left unconnected or tied to VDD,
single or dual tones may be generated. When Vss is applied dual tones only are
generated and no input combinations will cause generation of a single tone.
Emitter output of a bipolar NPN transistor whose collector is tied to VDD. Input to
this transistor is from an op-amp which mixes, and regulates the output level of,
the row and column tones.
ROW AND COLUMN INPUTS
These inputs are compatible with the standard 2-of-8
keyboard, single contact (form A) keyboard and electronic
input. Figures 3 and 4 show these input configurations, and
Fig. 5 shows the internal structure of these inputs.
When operating with a keyboard, dual tones are generated
when any single button is pushed. Single tones are generated
when more than one button is pushed in any row
or column. No tones are generated when diagonallypositioned
buttons are simultaneously pressed.
An electronic input to a single column generates that single
column tone. Inputs to multiple columns generates no tone. An
electronic input to a single row generates no tone and a single
row tone may be generated only by activating 2 columns and
the desired row.
COL
CLASS A KEYBOARD
ROW
COL
ROW
2 OF 8 DTMF KEYBOARD
Figure 3: Keyboard configuration
VDD
VSS
COLUMN
VDD
ROW
VSS
Figure 4: Electronic input
ROW
INPUT
VDD
RR
STATIC
PROTECTION
COLUMN
INPUT
STATIC
PROTECTION
RC
VSS
Row input
sensing circuit
Column input
sensing circuit
Figure 5: Row and column inputs
3
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