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PDF LC75742E Data sheet ( Hoja de datos )

Número de pieza LC75742E
Descripción 1/2 Duty VFD Driver with Key Input Function
Fabricantes Sanyo Semicon Device 
Logotipo Sanyo Semicon Device Logotipo



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No Preview Available ! LC75742E Hoja de datos, Descripción, Manual

Ordering number : EN6142
CMOS IC
LC75742E, 75742W
1/2 Duty VFD Driver with Key Input Function
Overview
The LC75742E and LC75742W are 1/2 duty VFD drivers
that can be used for electronic tuning frequency display
and other applications under the control of a micro-
controller. These products can directly drive VFDs with
up to 82 segments. It also includes a key scan circuit and
can support input from up to 30 keys and can thus reduce
the number of lines to the front panel in application
systems.
Features
• Key input from up to 30 keys
(Key scans are only performed when keys are pressed.)
• 82 segment outputs.
• Noise reduction circuits are built into the output drivers.
• Serial data I/O supports CCB format communication
with the system controller.
• Dimmer and sleep mode can be controlled by serial data
input.
• High generality since display data is displayed without
the intervention of a decoder.
• All segments can be turned off with the BLK pin.
Package Dimensions
unit: mm
3151-QFP64E
1.0
48
49
[LC75742E]
17.2
14.0 1.6
0.8 0.35 1.0
33
32
0.15
64
1
17
16
0.1
2.7
unit: mm
3190-SQFP64
15.6 0.8
SANYO: QFP64E (QIP64E)
1.25
48
49
[LC75742W]
12.0
10.0
0.5 0.18
1.25
33
32
0.15
64
1
17
16
• CCB is a trademark of SANYO ELECTRIC CO., LTD.
• CCB is SANYO’s original bus format and all the bus
addresses are controlled by SANYO.
0.5 0.5
SANYO: SQFP64
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
43099TH (OT) No. 6142-1/18

1 page




LC75742E pdf
Block Diagram
LC75742E, LC75742W
Pin Descriptions
Pin No.
3
59
56
58
57
60
63
64
62
61
1, 2
44 to 4
45 to 50
51 to 55
Pin Function
VFL
VDD
VSS
OSCI
OSCO
Driver block power supply. Applications must provide a voltage in the range 8.0 to 18.0 V.
Logic block power supply. Applications must provide a voltage in the range 4.5 to 5.5 V.
Power supply ground. This pin must be connected to the system ground.
Oscillator circuit connections. An oscillator circuit is formed by connecting a resistor and a
capacitor externally to these pins.
Reset signal input used to initialize the IC internal state. During a reset,
BLK the display is turned off forcibly regardless of the internal display data.
Also note that the internal key data is all reset to 0 and key scan operations are disabled.
However, serial data input is possible in this state.
CL Serial data interface. These pins must be connected to the system microcontroller.
DI Note that since DO is an open-drain output, a pull-up resistor is required.
CE CL: Synchronization clock DI: Transfer data
DO CE: Chip enable
DO: Output data
G1, G2 Digit outputs. The frame frequency fO is (fOSC/4096) Hz.
S1 to S41 Segment outputs that display the display data transferred over the serial interface.
Key scan outputs. Normally, when a key matrix is formed, diodes are inserted in the key
KS1 to KS6 scan timing lines to prevent shorts. However, since this IC uses unbalanced CMOS outputs
in the output transistor circuit, the IC will not be damaged if these outputs are shorted.
KI1 to KI5 Key scan inputs. Pull-down resistors are built into the IC internal pin circuits.
I/O
I
O
I
I
O
O
O
O
I
Handling when unused
GND
OPEN
GND
GND
OPEN
OPEN
OPEN
OPEN
GND
No. 6142-5/18

5 Page





LC75742E arduino
Key input
(KS6 line)
Key scan
LC75742E, LC75742W
Serial data transfer Serial data transfer Key address (8FH) Serial data transfer
Key address
Key data read request
Key data read
Key data read
Key data read request
Multiple Key Presses
The LC75742E/W, even without diodes in the key scan lines, can scan for any combination of dual key presses, any
combination of triple key presses on any of the KI1 to KI5 key scan input pin lines, or any combination of multiple key
presses on any of the KS1 to KS6 key scan output lines. However, keys that are not pressed may be seen as having been
pressed for any other multiple key press combination. Accordingly, applications must insert diodes at each key. Also, to
reject any triple and higher multiple key presses, if three or more data readout are 1 ignore the data by the software or in
other ways.
Notes on the BLK Pin and Display Control
Since the states of the IC internal data (D1 to D82, and the control data) are undefined when power is first applied,
applications should turn off the display (i.e. set S1 to S41, and G1 and G2 low) by setting the BLK pin low at the same
time as power is applied. Applications should transfer all 128 bits of the serial data while BLK is held low, and only then
set BLK high. This will prevent random meaningless display at power on. (See figure 4.)
Note on the Power on Sequence
Applications must observe the following sequences when turning the power on or off.
• At power on: First turn on the logic system power (VDD), and then turn on the driver power (VFL)
• At power off: First turn off the driver power (VFL), and then turn off the logic system power (VDD).
Figure 4
No. 6142-11/18

11 Page







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