Daewoo DQD-2100D, Service Manual

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17
CIRCUIT OPERATIONAL DESCRIPTION
GR7/P7
GR6/P6
GR5/P5
GR4/P4
GR3/P3
GR2/P2
GR1/P1
GR0/P0
VEE
VEE
SCLK
SOUT
SIN
CS
GR8/SEG17 GR9/SEG16 GR10/SEG15 GR1
1/SEG14
GR12/SEC13 GR13/SEG12 GR14/SEG1
1
GR15/SEG10 GR16/SEG9 GR17/SEG8 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 SEG0 VCC
AN0 AN1 AN2 AN3 AN4 AN5
RESET OSC1 VSS OSC2 VCC
NOISE FILTER
NOISE FILTER
NOISE FILTER
SERIAL
I/O
MODE
REGISTER
DISPLAY CONTROL
CIRCUIT
DISPLAY
MEMORY
TRANSFER
COUNTER
COMMAND ANALYTIC
CIRCUIT
BIYE END
TRIGGER
A.D
OSCILLATION
CIRCUIT
SELECTOR/A.D
CONTROL CIRCUIT
26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11 10 9 8 7 6
5 4 3 2 1
FRONT SECTION
1. VFD DRIVER
1) Overview
IC710 implements following functions by serial communication with MICOM depending on the software.
* CMOS Technology
* Internal Pull-Low Resistance
* 4-step Dimming circuitry
* Output from 8 to 18 Segment
* Output from 7 to 10 Grid
* Built-in Noise filter in Serial clock and serial Input Pins with 2MHz sampling
* 8-bit x 6 channels Analog-to-Digital Converter with +-3LSB Accuracy
2) Input/output port description
* Input: It receives FPSEL, FPCLK and FPDOUT input from MICOM and KEY input by voltage Level.
* Output: It outputs FPDIN with MICOM and operates FLD.
3) Internal BLOCK DIAGRAM