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TECHNICAL DATA
PIN DESCRIPTION
LD1207
Pin Name
I/O
Description Oscillator Input Pin. A resistor is connected to this pin and GND. Data Input Pin. This pin inputs serial data at the rising edge of the shift clock (staring from the lower bit) Clock Input Pin. Rising edge trigger. Strobe pin for Serial Interface. The data input after the STB has fallen is processed as a command. When this pin is "HIGH", CLK is ignored. Power Supply Segment Output Pins(p-channel, open drain) Segment Output Pin/ Grid Output Pin (CMOS Output) Ground Pin Grid Output Pins (n-channel, open drain)
Pin No.
OSC
I
1
DIN CLK
I I
2 3
STB
I
4
VDD SG1 to SG9 SG10/GR7 to SG12/GR5 GND GR4 to GR1
O O O
5,18 6~14 15~17 19,24 20~23
3
TECHNICAL DATA
FUNCTIONAL DESCRIPTION
LD1207
Commands
A command is the first byte (b0 to b7) inputted to LD1207 via DIN Pin after STB Pin has changed from "HIGH" to "LOW" state. If for some reason the STB Pin is set "HIGH" while data or commands are being transmitted, the serial communication is initialized, and the data/commands being transmitted are considered invalid.
COMMAND 1 : DISPLAYMODE SETTING COMMANDS
LD1207 provides 4 display mode setting as shown in the diagram below: As stated earlier a command is the first one byte(b0 to b7) transmitted to LD1207 via the DIN Pin when STB is "LOW". However, for these commands, Bit No.3 to Bit No.6(b2 to b5) are ignored, Bit No.7 & Bit No.8(b6 to b7) are given a value of "0". The Display Mode Setting Commands determine the number of segments and grids be used (1/4 to 1/7 duty, 12 to 9 segments). When these commands are executed, the display forcibly turned off. A display command "ON" must be executed in order to resume display. If the same mode setting is selected, no command execution is take place, therefore, nothing happens. When Power is turned "ON", the 7-Grid, 9-Segment Mode is selected.
MSB 0 0 b1
LSB b0
Don't Care
Display Mode Settings : 00 : 4 Grids, 12 Segments 01 : 5 Grids, 11 Segments 10 : 6 Grids, 10 Segments 11 : 7 Grids, 9 Segments
4
TECHNICAL DATA
COMMAND 2 : DATA SETTING COMMANDS
LD1207
The Data Setting Commands executes the Data Write Mode for LD1207. The Data Setting Command, the bits5 and 6 (b4, b5) are ignored, bit7(b6) is given the value of "1" while bit8(b7) is given the value of "0". Please refer to the diagram below. When power is turned ON, bit 4 to bit 1 (b3 to b0) are given the value of "0".
MSB 0 1 b3 b2 b1 b0
LSB
Don't Care
Data Write Mode Settings : 00 : Write Data to Display Mode Address Increment Mode Settings (Display Mode): 0 : Increment Address after Data has been Written 1 : Fixes Address Mode Settings : 0 : Normal Operation Mode 1 : Test Mode
5
TECHNICAL DATA
COMMAND 3 : ADDRESS SETTING COMMANDS
LD1207
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 1 1 b3 b2 b1 b0 LSB
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 00HL 02HL 04HL 06HL 08HL 0AHL 0CHL b0 xxHL Lower 4 bits SG4 SG5 00HU 02HU 04HU 06HU 08HU 0AHU 0CHU b3 b4 xxHU Higher 4 bits SG8 SG9 01HL 03HL 05HL 07HL 09HL 0BHL 0DHL b7 SG12
DIG1 DIG2 DIG3 DIG4 DIG5 DIG6 DIG7
6
TECHNICAL DATA
COMMAND 4 : DISPLAY CONTROL COMMANDS
LD1207
The Display Control Commands are used to turn ON or OFF a display. It also used to set the pulse width. Please refer to the diagram below. When the power is turned ON, a 1/16 pulse width is selected and the displayed is turned OFF.
MSB 1 0 b3 b2 b1 b0
LSB
Don't Care
Dimming Quantity Settings : 000 : Pulse width = 1/16 001 : Pulse width = 2/16 010 : Pulse width = 4/16 011 : Pulse width = 10/16 100 : Pulse width = 11/16 101 : Pulse width = 12/16 110 : Pulse width = 13/16 111 : Pulse width = 14/16
Display Settings : 0 : Display OFF 1 : Display ON
7
TECHNICAL DATA
LD1207
DISPLAY TIMING WAVEFORM
TDISPLAY =500us
SG Output G1
DIG1
DIG2
DIG3
DIG4
--------
DIGn
DIG1
G2
G3
G4 ------Gn
8
TECHNICAL DATA
SWITCHING CHARACTERISTIC WAVEFORM
LD1207 Switching Characteristies Waveform is given below. fOSC
LD1207
OSC PWSTB STB
tCLK-STB
PWCLK CLK PWCLK
tsetup
DIN
thold
tTZL
Gn 90% 10%
tTLZ
tTZH
90% Sn 10%
tTHZ
PW CLK (Clock Pulse Width) 400ns t setup (Data Setup Time) 100ns t CLK-STB (Clock - Strobe Time) 1 t TZH (Rise Time) 1 t TZL <1
PWSTB (Strobe Pulse Width) 1 thold (Data Hold Time) 100ns t THZ (Fall Time) 10 fosc = Oscillation Frequency t TlZ <10
9
TECHNICAL DATA
SERIAL COMMUMICATION FORMAT
The following diagram shows the LD1207 serial communication format.
LD1207
RECEPTION (Data/Command Write)
If data continues.
STB
DIN
b0
b1
b2
b6
b7
CLK
1
2
3
7
8
10
TECHNICAL DATA
APLICATIONS
LD1207
Display memory is updated by incrementing addresses. Please refer to the following diagram.
STB
CLK
---------------------
DIN
Command1
Command2
Command3
Data1
---------------------
Data2
Command4
Where : Command 1 : Display Mode Setting Command 2 : Data Setting Command Command 3 : Address Setting Command Data 1 to n : Transfer Display Data (14 Bytes max.) Command 4 : Display Control Command
The following diagram shows the waveforms when updating specific addresses.
STB
DIN
CLK
command2
command3
Data
command3
Data
Where : Command 2 -- Data Setting Command Command 3 -- Address Setting Command Data -- Display Data
11
TECHNICAL DATA
RECOMMENDED SOFTWARE PROGRAMMING FLOWCHART
START
LD1207
SET COMMAND 1
SET COMMAND 2
SET COMMAND 3 Clear Display RAM (see Note 5)
INITIAL SETTING
SET COMMAND 4
MAIN PROGRAM
SET COMMAND 1
SET COMMAND2
MAIN LOOP
SET COMMAND 3
SET COMMAND 4
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
TECHNICAL DATA
SOP 24L (300 MIL) THERMAL PERFORMANCE IN STILL AIR
Junction Temperature : 100
1200 1000 800 600 400 200 0 -25 0 25 Ambient Temperature, Ta 50 () 75 IC Single
616 966
LD1207
Power Dissipation, Pd (mW)
IC Mounted Glass Epoxy PCB
100
13
TECHNICAL DATA
ABSOLUTE MAXIMUM RATINGS
(Unless otherwise stated, Ta=25, GND=0V) Parameter Supply Voltage Logic Input Voltage Driver Output Current/Pin Symbol VDD VI IOLGR IOHSG Maximum Driver Output Current/Total ITOTAL Rating -0.5 to +7.0 -0.5 to VDD+0.5 +250 -50 400
LD1207
Units V V mA mA mA
RECOMMENDED OPERATING RANGE
(Unless otherwise stated, Ta= -20 to +70, GND=0V) Parameter Logic Supply Voltage Dynamic Current (see Note) High-Level Input Voltage Low-Level Input Voltage Symbol VDD IDDdyn VIH VIL Min. 4.5 . 0.8VDD 0 Typ. 5 . . . Max. 5.5 5 VDD 0.3 VDD Unit V mA V V
Note : Test Condition : Set Display Control Commands = 80H (Display Turn OFF State)
14
TECHNICAL DATA
ELECTRICAL CHARACTERISTICS
(Unless otherwise stated, VDD=5V, GND=OV, Ta=25, Parameter Symbol IOHSG1
High-Level Output Current
LD1207
Test Condition
VO = VDD - 1V SG1 to SG9. SG10/GR7 to SG12/GR5 VO = VDD - 2V SG1 to SG9. SG10/GR 7 to SG12/GR5 VO = 0.3V GR1 TO GR4. SG10/GR7 to SG12/GR5 VO = VDD - 1V SG1 TO SG9. SG10/GR7 to SG12/GR5 R = 51KOms
Min. -10
Typ. -14
Max. -30
Unit mA
IOHSG2
-20
-25
-50
mA
Low-Level Output Current Segment High-Level Output Current Tolerance High-Level Input Voltage Low-Level Input Voltage Oscillation Frequency
IOLGR
100
140
-
mA
ITOLSG VIH VIL fOSC
0.8VDD
500
5 0.3VDD
% V V kHz
. 350
650
15
TECHNICAL DATA
APPLICATION CIRCUIT
+5V 0.1pF G1 DIGIT1 G2 DIGIT2 G3 DIGIT3 G4 DIGIT4 S1 S2 S3 S4 S5 S6 S7 S8 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7
LD1207
51K
OSC DIN CLK STB VDD SG1 SG2 SG3 SG4 SG5 SG6 SG7
GND GR1 GR2 GR3 GR4 GND VDD SG12/GR5 SG11/GR6 SG10/GR7 SG9 SG8
4-GRID X 12-SEGMENT (COMMON CAHODE)
G1 G2 G3 G4 +5V
MCU
S1 S2 S3 S4 S5 S6 S7
S12 S11 S10 S9 S8
SEG8 S9 SEG9 S10 SEG10 S11 SEG11 S12 SEG12
Note : The capacitor (0.1uF) connected between the GND and VDD Pins must be located as near as possible to the LD1207 chip.
COMMON CATHODE TYPE LED PANEL
SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8
a b c d e f g
COM/ DIGITAL(GRID)
a f b g c d h
e
h
16
TECHNICAL DATA
LD1207
Package Dimensions(24SOP)
D SUFFIX SOIC (MS - 013AD) Dimension, mm
A 24 13
Symbol A
MIN 15.20 7.40 2.35 0.33 0.40 1.27 9.53 0 0.10 0.23 10.00 0.25
MAX 15.60 7.60 2.65 0.51 1.27
H
B
P
B C
1
G
12 C R x 45
D F G
J F M
-TD 0.25 (0.010) M T C M K
SEATING PLANE
H J K M P R
NOTES: 1. Dimensions A and B do not include mold flash or protrusion. 2. Maximum mold flash or protrusion 0.15 mm (0.006) per side for A; for B 0.25 mm (0.010) per side.
8 0.30 0.32 10.65 0.75
17

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