SSD1812 View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

SSD1812

LCD Segment / Common Driver with Controller

Unspecified 

Set Indicator On/Off

This command turns on and off the static drive indicators. It also con-

trols whether standby mode or sleep mode will be entered after the

power save compound command. See “Set Power Save Mode”.

When the “Set Indicator On” command is sent, the “Indicator Display

Mode” must be followed in the next command. The “Set Indicator Off”

command is a single byte command and no following command is

required.

Set Power Save Mode

To enter Standby or Sleep Mode, it should be done by using a com-

pound command composed of “Set Display ON/OFF” and “Set Entire

Display ON/OFF” commands. When “Set Entire Display ON” is issued

during display is OFF, either Standby Mode or Sleep Mode will be

entered.

The status of the Static Indicator will determine which power save

mode is entered. If static indicator is off, the Sleep Mode will be entered:

1. Internal oscillator and LCD power supply circuits are stopped

2. Segment and Common drivers output VDD level

3. The display data and operation mode before sleep are held

4. Internal display RAM can still be accessed

If the static indicator is on, the chip enters Standby Mode which is sim-

ilar to sleep mode except:

1. the internal oscillator is on

2. the static drive system is on

Note also that if the software reset command is issued during Standby

Mode, Sleep Mode will be entered. Both power save modes can be

exited by the issue of a new software command or by pulling Low at

hardware pin RES.

NOP

No Operation Command

Set Test Mode

This command force the driver chip into its test mode for internal

testing of the chip. Under normal operation, user should NOT use this

command.

Status register Read

This command is issued by setting D/C Low during a data read (refer

to figure 1 and 2 parallel interface waveform). It allows the MCU to monitor

the internal status of the chip. No status read is provided for serial mode.

EXTENDED COMMANDS

These commands are used, in addition to basic commands, to trigger the

enhanced features, on top of general ones, designed for the chip.

Set Multiplex Ratio

This command switches default 54 multiplex mode to any multiplex

mode from 1 to 54. The chip pads ROW0-ROW63 will be switched to

corresponding COM signal output, see Table 1.

Set RAM Page Blinking Freq.

This command sets the blinking frequency of blinking page(s) which is

set using the “Set RAM Page Blinking”extended command.

Set Bias Ratio

Except the 1/4 bias, all the available bias ratio (1/5, 1/6, 1/7, 1/8, 1/9)

could be set using this command. When changing the display multiplex

ratio, the bias ratio also need to be adjusted to make display contrast

consistent.

Set Temperature Coefficient (TC) Value

This command is to set 1 out of 8 different temperature coefficients

in order to match various liquid crystal temperature grades.

Set 1/4 Bias Ratio

This command sets the bias ratio directly to 1/4 bias. This ratio is

especially for use in under 12mux display.

In order to restore to other bias ratio, this command must be executed,

with LSB=0, before the “Set Multiplex ratio”or “Set LCD Bias”command

is sent.

Set Display Offset

This command should be sent ONLY when the multiplex ratio is set

less than 54.

When the mulitplex ratio less than 54 is set, the display will be mapped

in the middle (y-direction) of the LCD, see Table 1. Use this command

could move the display vertically within the 54 commons.

To make the Reduced-Mux Com 0 (Com 0 after reducing the multiplex

ratio) towards the Row 0 direction for L lines, the 6-bit data in second com-

mand should be given by L.

To move in the other direction by L lines, the 6-bit data should be given

by 64-L.

Please note that the display is confined within the un-reduced 54 mux.

That is maximum value of L is given by the half of 54 minus the reduced-

multiplex ratio. For an odd display mux after reduction, moving away from

Row 0 direction will has 1 more step.

Set Smart Icon Mode

This command is used to enter/leave the Smart Icon Mode.

In Smart Icon Mode, Entire display will be turned off except the Icon

row.

Set RAM Page Blinking

This command enable the whole page to blink in the frequency set by

“Set RAM Page Blinking Freq.”command.

Setting either bit(s) in the data given in the second command will force

cooresponding page to blink. LSB of the data points to Page 0 and so on

to MSB for Page 7.

SSD1812 REV 1.2

20

12/99

SOLOMON

Share Link: