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UPD16311 Datasheet(PDF) 4 Page - NEC

Part No. UPD16311
Description  1/8- to 1/16-DUTY FIPTM VFD CONTROLLER/DRIVER
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Maker  NEC [NEC]
Homepage  http://www.nec.com/
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4
PD16311
Pin Function
Pin No.
Symbol
Pin Name
Description
6DIN
Data input
Inputs serial data at rising edge of shift clock, starting from lower
bit.
5DOUT
Data output
Outputs serial data at falling edge of shift clock, starting from
lower bit. This is N-ch open-drain output pin.
9
STB
Strobe
Initializes serial interface at rising or falling edge to make
PD16311 waiting for reception of command. Data input after
STB has fallen is processed as command. While command data
is processed, current processing is stopped, and serial interface
is initialized. While STB is high, CLK is ignored.
8
CLK
Clock input
Reads serial data at rising edge, and outputs data at falling edge.
52
OSC
Oscillator pin
Connect resistor for determining oscillation frequency to this pin.
15 to 26
Seg1/KS1 to
Seg12/KS12
High-voltage output
(segment)
Segment output pins (Dual function as key source)
44 to 37
Grid1 to Grid6
High-voltage output (grid)
Grid output pins
27 to 32
35 to 36
Seg13/Grid16 to
Seg20/Grid9
High-voltage output
(segment/grid)
These pins are selectable for segment or grid output.
50 to 46
LED1 to LED5
LED output
CMOS output. +20 mA max.
10 to 13
Key1 to Key4
Key data input
Data input to these pins is latched at end of display cycle.
1 to 4
SW1 to SW4
Switch input
These pins constitute 4-bit general-purpose input port.
14, 33, 45
VDD
Logic power
5 V
 10 %
51
VSS
Logic ground
Connect this pin to GND of system.
34
VEE
Pull-down level
VDD
 35 V max.
7
IC
Internally connected
Be sure to leave this pin open (this pin is at VDD level).




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