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STE2028
162 x 130 RGB single-chip true 262k color LCD controller driver
Data Brief
Features

Display supply voltage range from 4.5V to 20.8V One time programmable (OTP) non volatile embedded memory On chip calibration (with OTP Cells) of key configuration parameters Specific mode functionality to drive displays smaller than 162x130 (such as 160x128) Block diagram
C3 to C392 R0 to R161
162x130 RGB display matrix 385K Bits display data RAM 2M color palette 262k color mode Dual partial display mode Partial vertical scrolling Programmable number of lines N-line inversion Programmable frame rate over temperature Digitally programmable LCD voltage (up to 1024 steps) Digitally programmable LCD voltage compensation over temperature Selectable input interface: - 68000 & 8080 Parallel interfaces (read and write) - 3-lines and 4-lines SPI interface (read and write) - 3-lines 9-Bit serial interface (read and write) 1 Look-up table for gamma setting Fully integrated oscillator requires no external components. Fully integrated bias system and voltage generator Advanced MLS driving scheme for optimal color images rendering (P=4). Designed for chip-on-glass (COG) and chipon-foil (COF) applications Interface supply voltage range from 1.65V to 3.6V Logic supply voltage range from 1.65V to 1.95V High voltage generator supply voltage range from 2.2V to 3.6V
Figure 1.
BIAS VOLTAGE GENERATOR
COLUMN DRIVERS
ROW DRIVERS
DAC
GRAY LEVELS GENERATOR
MLS ROW DRIVING LOGIC
MLS COLUMN DRIVING LOGIC VCOM +VRPOS +VRPOS_SNS DDRAM Row Adr -VRNEG -VRNEG_SNS +VCPOS +VCPOS_SNS -VCNEG -VCNEG_SNS VDDB VDDA BUFFER VPP DATA REGISTER
DISPLAY CONTROL LOGIC
DATA LATCH & GAMMA CORRECTION
HIGH VOLTAGE GENERATOR
DDRAM Scan Logic
VDDD VDDI_AUX
130 x 162 x 18 Bit Display Data RAM
DDRAM Col Adr TIMING GENERATOR TE
VSSD VSSI_AUX TEST_MODE
OTP(Memory)
OSC COMMAND DECODER RESET
TEST_OSCOUT TEST_OSCIN
!RES
TEST_VREF

TEST 9 Bit SERIAL 3 & 4 Line SPI Parallel 8080 Parallel 68K SEL 0 SEL 1 SEL 2
TEST_VC2POS
TEST_VC2NEG VDDI SCL SDA
D[0..7]
E !RD
R/!W !WR
D/!C
!CS
LR238
Description
The STE2028 is a low power CMOS LCD controller driver featuring an extremely low current consumption. Designed to drive a 162 rows by 390 columns or 262k colors graphic display, with MLS (Multi-lineselection) algorithm, the STE2028 provides all the necessary functions in a single chip, including onchip LCD supply and bias voltage generators, resulting in a minimum of externals components.
June 2007
Rev 2
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STE2028
Description (continued)
The different shades of gray are achieved with algorithms aimed to minimize the refresh rate, current consumption and enable the use of new high speed CSTN (Color-Super Twisted Nematics) fluids. A complete set of digital functions limits the host controller overhead to manage complex display configurations and fast moving images data transfers to driver RAM. STE2028 features five standard interfaces (3-lines Serial, 3-lines SPI, 4-lines SPI, 68000 Parallel & 8080 parallel) for easy of interfacing with the host micro-controller. Table 1. Key features and benefits
Features Most integrated solution Low power solution Fully integrated OTP 262k color and 65k color, embedded RAM, 130 RGB x 162 Benefits Only four external caps Competitive consumption figures Flexible and integrated module maker parameter settings with low area consumption The best solution for low-cost 262k color displays
Figure 2.
Functional block diagram
9-bit 3wires / 8-bit 3&4-wire serial interfaces 8080 & 68K Parallel interfaces
Status register
Instruction decoder
Control register
ROW drivers MLS logic
Display RAM 130 rgb x 162 (18 Bits) 132rgb x 162 (18 Bits)
Clocks generator
Grey levels generators Gamma correction
High voltage generator Bias voltage generator
OTP
Column drivers
Note:
STMicroelectronics is neither licensed nor authorized to license its customers under one or more patents held by Motif Corporation to use this integrated circuit in the manufacture of liquid crystal display modules. Such license can be obtained by Motif Corporation.
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STE2028
Ordering information
Ordering information
Table 2. Order codes
Description Bumped dice on waffle pack
Part number STE2028D3
Revision history
Table 3.
Date 19-Dec-2006 18-Jun-2007
Document revision history
Revision 1 2 Initial release. Added a note on patents held by Motif Corporation and updated the display resolution to 162 x 130. Changes
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STE2028
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