128x64 COG LCD Module with PCB, Chip-on-Glass LCD Module (Positive Voltage) - RX12864K1
128x64 COG LCD Module with PCB, Chip-on-Glass LCD Module (Positive Voltage) - RX12864K1
128x64 COG LCD Module with PCB, Chip-on-Glass LCD Module (Positive Voltage) - RX12864K1

128x64 COG LCD Module with PCB, Chip-on-Glass LCD Module (Positive Voltage)

Model No. RX12864K1

RX12864K1 is a dot matrix 128x64 COG Graphic LCD module (Chip-on-Glass LCD Module) with LED backlight. The module dimension is 89.7x49.8mm with active area size 63.98x31.98 mm. This module using ST7565V IC supports 8080, 6800 and SPI interface.

RX12864K1 is a perfect drop-in replacement for certain discontinued display modules on the market. Four screw holes allow for quick & easy mounting. Raystar changed the IC to ST7565P (positive voltage). ST7565P serves as a replacement for IC NT7534.

Supply voltage for logic of this 128x64 COG LCD Module ranges from 2.8V-3.2V, the typical value is 3V. The module works within temperature from -20 to +70°C; storage temperature covers from-30 to +80℃.

Data source ref: RX12864K1-BIW

Inquiry or Demo Code Datasheet Back Previous Next
  • General Specs
  • Interface Pin Function
  • Contour Drawing
  • Absolute Maximum Ratings
  • Electrical Characteristics
Item Dimension Unit
Structure COG
Dot Matrix / Resolution 128 × 64 dots
Module Dimension 89.7 × 49.8 × 6.0 mm
Viewing Area 66.8 × 35.5 mm
Active Area 63.98 × 31.98 mm
Dot / Pixel Size 0.48 × 0.48 mm
Dot / Pixel Pitch 0.50 × 0.50 mm
Backlight Type LED
IC ST7565P
Interface 6800 / 8080 / SPI
Power Supply 3.3V
Duty 1/65 duty cycle, 1/9 Bias
Type Graphic LCD Display
Pin No. Symbol Description
1 /CS1 This is the chip select signal. When /CS1 = “L” and CS2 = “H”, then the chip select becomes active, and data/command I/O is enabled.
2 /RES When /RES is set to “L”, the register settings are initialized (cleared).
The reset operation is performed by the /RES signal level.
3 A0 This is connect to the least significant bit of the normal MPU address bus, and it determines whether the data bits are data or command.
A0 = “H”: Indicates that D0 to D7 are display data.
A0 = “L”: Indicates that D0 to D7 are control data.
4 /WR • When connected to 8080 series MPU, this pin is treated as the “/WR” signal of the 8080 MPU and is LOW-active.
The signals on the data bus are latched at the rising edge of the /WR signal.
• When connected to 6800 series MPU, this pin is treated as the “R/W” signal of the 6800 MPU and decides the access type :
When R/W = “H”: Read.
When R/W = “L”: Write.
5 /RD • When connected to 8080 series MPU, this pin is treated as the “/RD” signal of the 8080 MPU and is LOW-active.
The data bus is in an output status when this signal is “L”.
• When connected to 6800 series MPU, this pin is treated as the “E” signal of the 6800 MPU and is HIGH-active.
This is the enable clock input terminal of the 6800 Series MPU.
6 D0 This is an 8-bit bi-directional data bus that connects to an 8-bit or 16-bit standard
MPU data bus.
When the serial interface (SPI-4) is selected (P/S = “L”) :
D7 : serial data input (SI) ; D6 : the serial clock input (SCL). D0 to D5 should be connected to VDD or floating.
When the chip select is not active, D0 to D7 are set to high impedance.
7 D1
8 D2
9 D3
10 D4
11 D5
12 D6
13 D7
14 VDD Power supply Power supply
15 GND Ground
16 VOUT DC/DC voltage converter. Connect a capacitor between this terminal and VSS or VDD
17 CAP3+ DC/DC voltage converter. Connect a capacitor between this terminal and the CAP1N terminal.
18 CAP1- DC/DC voltage converter. Connect a capacitor between this terminal and the CAP1P terminal.
19 CAP1+ DC/DC voltage converter. Connect a capacitor between this terminal and the CAP1N terminal.
20 CAP2+ DC/DC voltage converter. Connect a capacitor between this terminal and the CAP2N terminal.
21 CAP2- DC/DC voltage converter. Connect a capacitor between this terminal and the CAP2P terminal.
22 V4 This is a multi-level power supply for the liquid crystal drive. The voltage Supply applied is determined by the liquid crystal cell, and is changed through the use of a resistive voltage divided or through changing the impedance using an op. amp. Voltage levels are determined based on Vss, and must maintain the relative magnitudes shown below.
V0 ≧V1  ≧V2  ≧V3  ≧V4  ≧Vss
When the power supply turns ON, the internal power supply circuits produce the V1 to V4 voltages shown below. The voltage settings are selected using the LCD bias set command.
23 V3
24 V2
25 V1
26 V0
27 VR Output voltage regulator terminal. Provides the voltage between VSS and V0 through a resistive voltage divider.
IRS = “L” : the V0 voltage regulator internal resistors are not used. IRS = “H” : the V0 voltage regulator internal resistors are used.
28 C86 This is the MPU interface selection pin. C86 = “H”: 6800 Series MPU interface. C86 = “L”: 8080 Series MPU interface.
29 P/S This pin configures the interface to be parallel mode or serial mode. P/S = “H”: Parallel data input/output.
P/S = “L”: Serial data input.
The following applies depending on the P/S status:
P/S Data/Command Data Read/Write Serial Clock
"H" A0 D0 to D7 /RD, /WR X
"L" A0 SI (D7) Write only SCL (D6)
When P/S = “L”, D0 to D5 must be fixed to “H”.
/RD (E) and /WR (R/W) are fixed to either “H” or “L”.
The serial access mode does NOT support read operation.
30 IRS This terminal selects the resistors for the V0 voltage level adjustment.
IRS = “H”: Use the internal resistors
IRS = “L”: Do not use the internal resistors. The V0 voltage level is
regulated by an external resistive voltage divider attached to the VR terminal

128x64 COG LCD Module with PCB, Chip-on-Glass LCD Module (Positive Voltage) - RX12864K1

Item Symbol Min Typ Max Unit
Operating Temperature TOP -20 － +70 ℃
Storage Temperature TST -30 － +80 ℃
Power Supply Voltage VDD -0.3 － 3.6 V
Power supply voltage (VDD standard) V0, VOUT -0.3 － 14.5 V
Power supply voltage (VDD standard) V1, V2, V3, V4 -0.3 － V0+0.3 V
Item Symbol Condition Min Typ Max Unit
Supply Voltage For Logic VDD-VSS － 2.8 3.0 3.2 V
Supply Voltage For LCD VOP Ta=-20℃
Ta=25℃
Ta=70℃		 －
9.3
－		 －
9.5
－		 －
9.7
－		 V
V
V
Input High Volt. VIH － 0.8 VDD － VDD V
Input Low Volt. VIL － VSS － 0.2 VDD V
Output High Volt. VOH － 0.8 VDD － VDD V
Output Low Volt. VOL － VSS － 0.2 VDD V
Supply Current IDD VDD=3.0V － － 2.0 mA

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