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Epson SED1225 Series Technical Manual

Lcd controller/drivers
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SED1225 Series
LCD Controller/Drivers
Technical Manual

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  • Page 1 SED1225 Series LCD Controller/Drivers Technical Manual...

  • Page 2: Table Of Contents

    Contents OUTLINE ................................3–1 FEATURES ................................3–1 BLOCK DIAGRAM ............................... 3–2 PIN ASSIGNMENT .............................. 3–3 PIN DESCRIPTION ............................. 3–6 FUNCTION DESCRIPTION ..........................3–9 COMMAND ................................ 3–13 COMMAND LIST ............................... 3–16 BUILT-IN MEMORIES ............................3–17 MAXIMUM ABSOLUTE RATINGS ........................3–25 DC CHARACTERISTICS ........................... 3–26 SIGNAL TIMING CHARACTERISTICS ......................

  • Page 3: Outline

    SED1225 Series OUTLINE • Available external clock input • High-speed MPU interfaces The SED1225 dot-matrix LCD Controller Driver receives Interface to both 68- and 80-series MPUs 4-bit, 8-bit, or serial data from the microprocessor and Support of 4/8-bit interface displays up to 36 characters, four user-defined characters, •...

  • Page 4: Block Diagram

    SED1225 Series BLOCK DIAGRAM DDRAM Refresh Address Symbol Address Counter Register Counter D6(SCL) D7(SI) CGROM CGRAM Cursor Command XWR(E) Control Decoder REG1 REG2 Static Segment Icon Driver Driver Driver Driver XLE1 XLE2 COMSA SEG1 to 60 COM1 to 24 SEGSA to J...

  • Page 5: Pin Assignment

    SED1225 Series PIN ASSIGNMENT ....(0,0) Top View ........
  • Page 6 SED1225 Series Pad coordinates (1/2) Coordinate Coordinate Name Name Dummy -3768 -822 1718 -822 Dummy -3678 -822 1808 -822 -3349 -822 1973 -822 XWR(E) -3200 -822 2122 -822 -3050 -822 2272 -822 D7(SI) -2901 -822 2421 -822 D6(SCL) -2751 -822...
  • Page 7 SED1225 Series Pad coordinates (2/2) Coordinate Coordinate Name Name SEG11 2333 SEG54 -1524 SEG12 2243 SEG55 -1614 SEG13 2153 SEG56 -1704 SEG14 2064 SEG57 -1793 SEG15 1974 SEG58 -1883 SEG16 1884 SEG59 -1973 SEG17 1795 SEG60 -2062 SEG18 1705 SEGS4...

  • Page 8: Pin Description

    SED1225 Series PIN DESCRIPTION Power Supply Pins Pin Name Description No. of Pins Connects to the logic power supply. This is common to the Vcc power pin of Power supply the MPU. Power supply 0V power pin connected to system ground (GND) Multi-level LCD drive power supplies.
  • Page 9 SED1225 Series System Bus Connector Pins Pin Name Descrition No. of Pins An 8-bit input data bus to be connected to the standard 8- or 16-bit MPU data bus. Pins D7 and D6 function as the serial data and clock inputs respectively if PS is logical low.
  • Page 10 SED1225 Series LCD Driver Signals Dynamic drive pins No. of Description Name Pins COM1 to Common signal output pins (for character display) COM24 COMS1, Common signal output pins (for non-character display) COMS2 COMS1, COMS2: Common outputs for symbol display SEG1 to...

  • Page 11: Function Description

    SED1225 Series FUNCTION DESCRIPTION The SED1225 can transfer data via the 4- or 8-bit data bus or via the serial data input (SI). The parallel or serial data MPU Interfaces input can be selected by setting the PS pin to high or low (see Table 1).
  • Page 12 SED1225 Series Figure 1 Data bus signal identification The SED1225 identifies the data bus based on a combination of A0, AWR and E signals as defined on Table 3. Table 3 Common 68 Series 80 Series Function Writes in the RAM and symbol register.
  • Page 13 SED1225 Series Power Save mode Voltage regulator • Voltage regulator using the electronic control function The SED1225 supports the Standby and Sleep modes to Use the electronic control function and set the voltages save the power consumption during system idling.
  • Page 14 SED1225 Series Reset Circuit When the RES input is made active, this LSI is initialized. (7)LED register • Initialization status Address: (1) Display ON/OFF control Data: (0,0,0,0,0) C=0: Cursor off (8)CG RAM, DD RAM and symbol register B=0: Blink off...

  • Page 15: Command

    SED1225 Series COMMAND Table 4 lists the supported commands. The SED1225 commands are analyzed and executed in the internal identifies a data bus by a combination of A0, XWR and timing only. E signals. It features high-speed processing as the •...
  • Page 16 SED1225 Series The character on the 3rd line will be displayed in (5) System Reset double size on the second and third lines by The System Reset command sets the display setting DC=1. direction, the display line, and the use or no use of CGRAM.
  • Page 17 SED1225 Series (4) Horizontal vertical flipping (6) RAM Address Setup The RAM Address Setup command sets an address SEG1 SEG60 into the Address counter to write data into DDRAM, CGRAM and Symbol register. COM1 When the cursor display is ON, the cursor is located at a position corresponding to the DDRAM address set by this command.
  • Page 18 SED1225 Series EPSON 3–16...

  • Page 19: Built-In Memories

    SED1225 Series BUILT-IN MEMORIES Character Generator ROM (CGROM) The SED1225’s CGROM is a mask ROM and it can be The SED1225 contains up to 126 types of CGROMs. Each character has a 5×8-dot structure. used as a custom CGROM. Consult to our sales agency for details.
  • Page 20 SED1225 Series Table 5 SED1225D Lower 4 Bit of Code EPSON 3–18...
  • Page 21 SED1225 Series Table 6 SED1225D Lower 4 Bit of Code EPSON 3–19...
  • Page 22 SED1225 Series Table 7 SED1225D Lower 4 Bit of Code EPSON 3–20...
  • Page 23 SED1225 Series Character Generator RAM (CGRAM) The SED1225 has a built-in CGRAM to program user- store up to four 5×8-dot character patterns. The following provides the relationship between CGRAM defined character patterns for highly flexible signal and character display. character patterns and CGRAM addresses and character Issue the System Setup command to use the CGRAM.
  • Page 24 SED1225 Series Symbol Register The SED1225 has a built-in Symbol register to allow The following provides the relationship between the separate symbol setup on the display panel. Symbol register display patterns, RAM addresses and The Symbol register has the 120-bit storage capacity, and write data.
  • Page 25 SED1225 Series Static Icon RAM The SED1225 has a built-in Static Icon RAM to display it can display 10 icons. The following provides the a static icon separately from the dynamic icon. relationship between the static icon functions and the The Static Icon RAM has the 20-bit storage capacity, and static icon, RAM address and write data.
  • Page 26 SED1225 Series Electronic Control RAM (Register) The SED1225 has the electronic control functions to Control RAM. control LCD drive voltages and to adjust the LCD The following provides the relationship between the display density. One of 32-state LCD voltages can be RAM address and write data by electronic control setup.

  • Page 27: Maximum Absolute Ratings

    SED1225 Series MAXIMUM ABSOLUTE RATINGS Item Symbol Rating Unit Power voltage (1) –0.6 to +0.3 Power voltage (2) –7.0 to +0.3 Power voltage (3) to +0.3 Input voltage –0.3 to +0.3 Output voltage –0.3 to +0.3 °C Operating temperature Topr –30 to +85...

  • Page 28: Dc Characteristics

    SED1225 Series DC CHARACTERISTICS = –3.6 to –1.7 V, Ta = –30 to +85°C unless otherwise noted.) Item Symbol Conditions Min. Typ. Max. Unit 1/4 bias –3.6 –3.0 –1.7 Operable Power 1/5 bias –3.6 –3.0 –2.7 voltage Data hold –3.6 –1.5...
  • Page 29 SED1225 Series *1 Although the wide operating character range is guaranteed, a quick and excessive voltage variation may not be guaranteed during access by the MPU. The low-voltage data hold characteristics are valid during Sleep mode. No access by the MPU is allowed during this time.

  • Page 30: Signal Timing Characteristics

    SED1225 Series SIGNAL TIMING CHARACTERISTICS (1) MPU bus write timing (80 series) CYC8 D0 to D7 (Ta = –30 to +85°C, V = –3.6V to –1.7V) Item Signal Symbol Conditions Min. Max. Unit Address setup time — Address hold time —...
  • Page 31 SED1225 Series (2) MPU bus write timing (68 series) CYC6 D0 to D7 (Ta = –30 to +85°C, V = –3.6V to –1.7V) Item Signal Symbol Conditions Min. Max. Unit Address setup time – Address hold time – XCS setup time –...
  • Page 32 SED1225 Series (3) Serial interface SCYC (Ta = –30 to +85°C, V = –3.6V to –1.7V) Item Signal Symbol Conditions Min. Max. Unit System clock cycle 3000 — SCYC SCL "Hi" pulse width 2850 — SCL "Lo" pulse width —...

  • Page 33: Mpu Interfaces (Reference)

    SED1225 Series MPU INTERFACES (REFERENCE) The SED1225 can be connected to the 80-series or 68- a certain time due to RESET, the RESET signal must be series MPU. Also, it can operate with a less number of entered in the SED1225 after the SED1225’s inputs have signal lines via the serial interface.

  • Page 34: Lcd Cell Interface

    SED1225 Series LCD CELL INTERFACE 12 columns by 3 lines, 5×8 dots + Symbols ....LCD panel 12 columns SED 1225 Static Icon COMSA...
  • Page 35 SED1225 Series 12 columns by 2 lines (N=1), 5×8 dots + Symbols LCD panel 1 • • • • • • • • • • • • • 12 columns SED 1225 Static icon COMSA SEGSA SEGSJ Symbol Signal Signal...

  • Page 36: Lcd Drive Waveforms (B Waveforms)

    SED1225 Series LCD DRIVE WAVEFORMS (B WAVEFORMS) COM 1 COM 1 COM 2 COM 3 COM 4 COM 5 COM 6 COM 7 COM 8 COM 2 COM 9 COM 10 COM 11 COM 12 COM 13 COM 14 COM 3...

  • Page 37: Example Of Instruction Setup (Reference)

    SED1225 Series EXAMPLE OF INSTRUCTION SETUP (REFERENCE) Initialization VDD-VSS power on Power stable Reset input Command status - Static display control - off - Display on/off control - off - Power save - off - Power supply control - off - System setup - 3-digit display, CGRAM unused.
  • Page 38 SED1225 Series Display Mode End of initialization RAM address set input RAM (data) write input Display the written contents. Standby Mode (1) Setting the standby mode End of initialization Normal operation - Power save is cleared and oscillating circuit turns on.
  • Page 39 SED1225 Series Sleep Mode (1) Setting the Sleep mode. End of initialization Normal operation (Power save is cleared and oscillating circuit turns on.) <1> Display on/off control command input - D off (display) (See Note 3) <2> Power save icon control...

  • Page 40: Option List

    SED1225 Series OPTION LIST The SED 1225 has the following options. Options are available exclusively for users. Please contact our Sales Department for information. • The following shows how to define the name of the product compatible with options: Example: SED1225D ↑...
  • Page 41 SED1225 Series EPSON 3–39...

  • Page 42: Cautions

    SED1225 Series CAUTIONS The following points should be noted when this Development Specification is used: 1. This Development Specification is subject to modification for improvement without prior notice. 2. This Development Specification is not intended to guarantee enforcement of industrial property and other rights, or to grant license for the use of this product.

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