LD1207 ETC1

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Technical content

I I I I O O O Description Pin No. Oscillator Input Pin. A resistor is connected to this pin and GND. 1 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. 3 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 5,18 Segment Output Pins(p-channel, open drain) 6~14 Segment Output Pin/ Grid Output Pin (CMOS Output) 15~17 Ground Pin 19,24 Grid Output Pins (n-channel, open drain) 20~23

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. LSBMSB 0 - - - - b1 b00 Display Mode Settings : 00 : 4 Grids, 12 Segments 01 : 5 Grids, 11 Segments 10 : 6 Grids, 10 Segments 11 : 7 Grids, 9 Segments Don’t Care

COMMAND 2 : DATA SETTING COMMANDS 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”. LSBMSB 0 1 - - b3 b2 b1 b0 Data Write Mode Settings : 00 : Write Data to Display Mode Don’t Care 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

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. LSBMSB 1 1 - - b3 b2 b1 b0 Address : 00H to 0DHDon’t Care 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. SG4 SG5 SG8 SG9 SG12SG1 DIG100HL 04HU 00HU 05HL 01HL 02HU 03HL02HL 04HL 06HU 07HL06HL 08HU 09HL08HL 0AHU 0BHL0AHL 0CHU 0DHL0CHL DIG2 DIG3 DIG4 DIG5 DIG6 DIG7 b3 b4 b7b0 xxHL xxHU Lower 4 bits Higher 4 bits

COMMAND 4 : DISPLAY CONTROL COMMANDS 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. LSBMSB 1 0 - - b3 b2 b1 b0 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 Don’t Care Display Settings : 0 : Display OFF 1 : Display ON

TDISPLAY =500us

SWITCHING CHARACTERISTIC WAVEFORM LD1207 Switching Characteristies Waveform is given below. fOSC OSC PWSTB STB CLK DIN 10% 90% PWCLK tsetup thold tCLK-STB 90% 10% tTZH tTLZ tTHZ PWCLK tTZL Gn Sn 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㎲

SERIAL COMMUMICATION FORMAT The following diagram shows the LD1207 serial communication format. RECEPTION (Data/Command Write) If data continues. STB DIN b0 b1 b2 b6 b7 1 23 78CLK

Display memory is updated by incrementing addresses. Please refer to the following diagram. Command1 Command2 Command3 Data1 Data2 Command4 STB CLK DIN 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. command2 command3 Data command3 Data STB DIN CLK Where : Command 2 -- Data Setting Command Command 3 -- Address Setting Command Data -- Display Data

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.

SOP 24L (300 MIL) THERMAL PERFORMANCE IN STILL AIR Junction Temperature : 100℃ 1200 966 616 IC Mounted Glass Epoxy PCB IC Single 1000 Power Dissipation, Pd (mW) 800 600 400 200 -25 0 25 50 75 100 Ambient Temperature, Ta (℃)

(Unless otherwise stated, Ta=25℃, GND=0V) Parameter Supply Voltage Logic Input Voltage Driver Output Current/Pin Maximum Driver Output Current/Total Symbol VDD VI ITOTAL IOHSG Rating Units -0.5 to +7.0 V -0.5 to VDD+0.5 V 400 -50 mA mA +250 mAIOLGR 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 Typ. Max. Unit 5.5 V 5 mA VDD V

0.3 VDD V

Note : Test Condition : Set Display Control Commands = 80H (Display Turn OFF State)

ELECTRICAL CHARACTERISTICS

(Unless otherwise stated, VDD=5V, GND=OV, Ta=25℃, Symbol Test Condition IOHSG1 Min. Typ. Max. UnitParameter VO = VDD -1 V SG1 to SG9. SG10/GR7 to SG12/GR5 IOHSG2 VO = VDD -2 V SG1 to SG9. SG10/GR 7 to SG12/GR5 -10 -14 -30 mA High-Level Output Current IOLGR -20 -25 -50 mA VO = 0.3V GR1 TO GR4. SG10/GR7 to SG12/GR5 ITOLSG Low-Level Output Current 100 140 - mA VO = VDD -1 V SG1 TO SG9. SG10/GR7 to SG12/GR5 VIH Segment High-Level Output Current Tolerance - - ±5 % VIL High-Level Input Voltage - - V0.8VDD Low-Level Input Voltage . - V0.3VDD- Oscillation Frequency 350 500 650 kHzfOSC R = 51KOms

(COMMON CAHODE) +5V +5V 51K 0.1pF 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 a b c d e f g h SEG1 COM/ DIGITAL(GRID) aSEG2 SEG3 bf gSEG4 SEG5 ce SEG6 d hSEG7 SEG8

Package Dimensions(24SOP) D SUFFIX SOIC (MS - 013AD) Symbol MIN MAX A 15.20 15.60 B7 .40 7.60 C2 .35 2.65 D0 .33 0.51 F0 .40 1.27 G H NOTES: J0 ° 8° 1. Dimensions A and B do not include mold flash or protrusion. K0 .10 0.30 R0 .25 0.75 1.27 9.53 Dimension, mm A BH C K C M J F M P G D R x 45 SEATING PLANE 0.25 (0.010) M T -T-