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LC75725E (UIC10) : VFD driver
1. Pin layout
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
S8
49
S7
50
S6
51
S5
52
S4
53
S3
54
S2
55
S1
56
Vss
57
OSCO
58
OSCI
59
VDD
60
BLK
61
CE
62
CL
63
DI
64
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
3. Pin function
Pin No.
Symbol
1,13
VFL
60
VDD
57
Vss
59
OSCI
58
OSCO
61
BLK
63
CL
64
DI
62
CE
2-12
G1-G11
56-14
S1-S43
32
S25
31
S26
30
S27
29
S28
28
S29
27
S30
S31
26
25
S32
24
S33
S34
23
22
S35
21
S36
20
S37
19
S38
18
S39
17
S40
I/O
-
Driver block power supply connection. (Both pins must be connected.)
-
Logic block power supply connection. Provide a voltage between 4.5 and 5.5V.
-
Power supply connection. Connect to the ground.
I
Oscillator connection. An oscillator circuit is formed by connecting an external resistor
O
and capacitor to these pins.
Display off contort input.
I
BLK = Low (Vss)...Display off.(S1 toS43 and G1 to G11 at VFL level.)
BLK = High (VDD)...Display on.
Note that serial data can be transferred while the display is turned off.
Serial data transfer inputs. These pins must be connected to the system microcontroller.
I
CL: Synchronization clock
DI: Transfer data
CE: Chip enable
O
Digit outputs. These pins are P-channel open drain outputs with pull-down resistors.
O
Segment outputs for displaying the display data transferred by serial data input. These pin
are P-channel open drain outputs with pull-down resistors.
2. Block diagram
DIGIT
DRIVER
BLK
VFL
CONTROL
TIMING
GENERATOR
DRIVER
OSCI
CLOCK
GENERATOR
OSCO
Function
SEGMENT DRIVER
MPX
LATCH
DIMMRE
GRID
TIMING
GENERATOR
SHIFT REGISTER
ADDRESS
DETECTOR
TH-A5R
1-29
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