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LD1207 Schematic ( PDF Datasheet ) - IK Semiconductor

Teilenummer LD1207
Beschreibung 12/9 Segment Output Lines
Hersteller IK Semiconductor
Logo IK Semiconductor Logo 




Gesamt 17 Seiten
LD1207 Datasheet, Funktion
TECHNICAL DATA
LD1207
.comDESCRIPTION
t4UThe LD1207 is specifically designed for LED and LED DISPLAY derivers.
eThe LD1207 have 12/9 segment output lines, 7 to 4 grid output lines, one display memory, control circuit
eand 3 line serial data interface.
hThis function are all incorporated into a single chip to build a highly reliable peripheral
Sdevice for a single chip microcomputer. It is very convenience to control for numeric display.
taLD1207’s pin assignments and application circuit are optimized for easy PCB Layout and cost saving
aadvantages.
www.D U.comFEATURES
et4· CMOS Technology
e· Segment output line selection by command : 12 ~ 9
h· Grid output line selection by command : 7 ~ 4
· Operation voltage : 5V
S· Low Power Consumption
· 8-Step Dimming control by command
ta· Serial Interface for Clock, Data Input, Strobe Pins
· 24-pin, SOP Package
.DaAPPLICATION
www www.DataSheet4U.com· Segment LED display : VCR, DVD, MWO
1






LD1207 Datasheet, Funktion
TECHNICAL DATA
LD1207
COMMAND 3 : ADDRESS SETTING COMMANDS
Address Setting Commands are used to set the address of the display memory. The address is
considered valid if it has a value of “00H” to 0DH”. If the address is set to 0EH or higher, the
data is ignored until a valid address is set. When power is turned ON, the address is set at “00H”.
Please refer to the diagram below.
MSB
LSB
1 1 - - b3 b2 b1 b0
Don’t Care
Address : 00H to 0DH
Display Mode and RAM Address
Data transmitted from an external device to LD1207 via the serial interface are stored in the
Display RAM and are assigned addresses. The RAM Addresses of LD1207 are given below in
8 bit unit.
SG1
SG4 SG5
SG8 SG9
SG12
00HL
02HL
04HL
06HL
08HL
0AHL
0CHL
00HU
02HU
04HU
06HU
08HU
0AHU
0CHU
01HL
03HL
05HL
07HL
09HL
0BHL
0DHL
b0
b3 b4
b7
DIG1
DIG2
DIG3
DIG4
DIG5
DIG6
DIG7
xxHL
Lower 4 bits
xxHU
Higher 4 bits
6

6 Page









LD1207 pdf, datenblatt
TECHNICAL DATA
LD1207
RECOMMENDED SOFTWARE PROGRAMMING FLOWCHART
START
SET
COMMAND 1
SET
COMMAND 2
SET
COMMAND 3
Clear Display RAM
(see Note 5)
SET
COMMAND 4
MAIN
PROGRAM
SET
COMMAND 1
SET
COMMAND2
SET
COMMAND 3
SET
COMMAND 4
INITIAL
SETTING
MAIN
LOOP
END
Note : 1. Command 1 : Display Mode Setting
2. Command 2 : Data Setting Commands
3. Command 3 : Address Setting Commands
4. Command 4 : Display Control Commands
5. When IC power is applied for the first time, the contents of the Display RAM are not defined : thus,
it is strongly suggested that the contents of the Display RAM must be cleared during the initial setting.
12

12 Page





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