ETC LD1207

TECHNICAL DATA
LD1207
PIN DESCRIPTION
Pin Name
I/O
Description
Pin No.
OSC
I
Oscillator Input Pin.
A resistor is connected to this pin and GND.
1
DIN
I
Data Input Pin.
This pin inputs serial data at the rising edge of
the shift clock (staring from the lower bit)
2
CLK
I
Clock Input Pin.
Rising edge trigger.
3
STB
I
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.
4
VDD
-
Power Supply
5,18
SG1 to SG9
O
Segment Output Pins(p-channel, open drain)
6~14
SG10/GR7 to
SG12/GR5
O
Segment Output Pin/ Grid Output Pin
(CMOS Output)
15~17
GND
-
Ground Pin
19,24
GR4 to GR1
O
Grid Output Pins (n-channel, open drain)
20~23
3
TECHNICAL DATA
LD1207
FUNCTIONAL DESCRIPTION
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.
LSB
MSB
0
0
-
-
-
Don’t Care
-
b1
b0
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
LD1207
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”.
LSB
MSB
0
1
-
-
Don’t Care
b3
b2
b1
b0
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
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.
LSB
MSB
1
1
-
-
b3
b2
b1
b0
Address : 00H to 0DH
Don’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
SG1
SG8 SG9
SG12
00HL
00HU
01HL
DIG1
02HL
02HU
03HL
DIG2
04HL
04HU
05HL
DIG3
06HL
06HU
07HL
DIG4
08HL
08HU
09HL
DIG5
0AHL
0AHU
0BHL
DIG6
0CHL
0CHU
0DHL
DIG7
b3
b0
b4
b7
xxHL
xxHU
Lower 4 bits
Higher 4 bits
6
TECHNICAL DATA
LD1207
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.
LSB
MSB
1
0
-
-
Don’t Care
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
Display Settings :
0 : Display OFF
1 : Display ON
7
TECHNICAL DATA
LD1207
DISPLAY TIMING WAVEFORM
TDISPLAY =500us
SG Output
DIG1
DIG2
DIG3
DIG4
--------
DIGn
DIG1
G1
G2
G3
G4
------Gn
8
TECHNICAL DATA
LD1207
SWITCHING CHARACTERISTIC WAVEFORM
LD1207 Switching Characteristies Waveform is given below.
fOSC
OSC
PWSTB
STB
tCLK-STB
PWCLK
PWCLK
CLK
tsetup
thold
DIN
tTZL
Gn
tTLZ
90%
10%
tTZH
tTHZ
90%
Sn
10%
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
LD1207
SERIAL COMMUMICATION FORMAT
The following diagram shows the LD1207 serial communication format.
RECEPTION (Data/Command Write)
If data continues.
STB
DIN
CLK
b0
1
b1
2
b2
3
b6
7
b7
8
10
TECHNICAL DATA
LD1207
APLICATIONS
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
LD1207
RECOMMENDED SOFTWARE PROGRAMMING FLOWCHART
START
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
LD1207
SOP 24L (300 MIL) THERMAL PERFORMANCE IN STILL AIR
Junction Temperature : 100℃
Power Dissipation, Pd (mW)
1200
1000
966
IC Mounted Glass Epoxy PCB
800
600
616
400
IC Single
200
0
-25
0
25
Ambient Temperature, Ta
50
75
100
(℃)
13
TECHNICAL DATA
LD1207
ABSOLUTE MAXIMUM RATINGS
(Unless otherwise stated, Ta=25℃, GND=0V)
Parameter
Symbol
Rating
Units
Supply Voltage
VDD
-0.5 to +7.0
V
Logic Input Voltage
VI
-0.5 to VDD+0.5
V
Driver Output Current/Pin
IOLGR
+250
mA
IOHSG
-50
mA
ITOTAL
400
mA
Maximum Driver Output Current/Total
RECOMMENDED OPERATING RANGE
(Unless otherwise stated, Ta= -20 to +70℃, GND=0V)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Logic Supply Voltage
VDD
4.5
5
5.5
V
Dynamic Current (see Note)
IDDdyn
.
.
5
mA
High-Level Input Voltage
VIH
0.8VDD
.
VDD
V
Low-Level Input Voltage
VIL
0
.
0.3 VDD
V
Note : Test Condition : Set Display Control Commands = 80H (Display Turn OFF State)
14
TECHNICAL DATA
LD1207
ELECTRICAL CHARACTERISTICS
(Unless otherwise stated, VDD=5V, GND=OV, Ta=25℃,
Symbol
Test Condition
Min.
Typ.
Max.
Unit
IOHSG1
VO = VDD - 1V
SG1 to SG9.
SG10/GR7 to SG12/GR5
-10
-14
-30
mA
IOHSG2
VO = VDD - 2V
SG1 to SG9.
SG10/GR 7 to SG12/GR5
-20
-25
-50
mA
IOLGR
VO = 0.3V
GR1 TO GR4.
SG10/GR7 to SG12/GR5
100
140
-
mA
ITOLSG
VO = VDD - 1V
SG1 TO SG9.
SG10/GR7 to SG12/GR5
-
-
±5
%
VIH
-
0.8VDD
-
-
V
Low-Level
Input Voltage
VIL
-
.
-
0.3VDD
V
Oscillation
Frequency
fOSC
R = 51KOms
350
500
650
kHz
Parameter
High-Level
Output Current
Low-Level
Output Current
Segment
High-Level
Output Current
Tolerance
High-Level
Input Voltage
15
TECHNICAL DATA
LD1207
APPLICATION CIRCUIT
+5V
0.1pF
51K
S1
S2
S3
S4
S5
S6
S7
GND
DIN
CLK
STB
VDD
SG1
SG2
SG3
SG4
SG5
SG6
SG7
GR1
GR2
GR3
GR4
GND
VDD
SG12/GR5
SG11/GR6
SG10/GR7
SG9
SG8
G1
G2
G3
G4
S1
+5V
S12
S11
S10
S9
S8
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
S2
S3
S4
S5
S6
S7
S8
4-GRID X 12-SEGMENT
(COMMON CAHODE)
MCU
OSC
G1
DIGIT1
G2
DIGIT2
G3
DIGIT3
G4
DIGIT4
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
a
COM/ DIGITAL(GRID)
b
a
c
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
d
b
f
g
e
f
c
e
g
d
h
h
16
TECHNICAL DATA
LD1207
Package Dimensions(24SOP)
D SUFFIX SOIC
(MS - 013AD)
Dimension, mm
A
24
13
H
B
1
P
12
G
R x 45
C
-TK
D
SEATING
PLANE
0.25 (0.010) M T C M
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.
J
F
Symbol
MIN
MAX
A
15.20
15.60
B
7.40
7.60
C
2.35
2.65
D
0.33
0.51
F
0.40
1.27
G
1.27
H
9.53
M
J
0°
8°
K
0.10
0.30
M
0.23
0.32
P
10.00
10.65
R
0.25
0.75
17