SSD1812_ View Datasheet(PDF) - Solomon Systech

Part Name

Description

Manufacturer

SSD1812_

Application of SSD181X/SSD1815A/SSD1815B to Existing LCD Modules

Solomon Systech  

Figure 1 & 2 show the common connection design of the LCD driver IC and the main Microprocessor (MCU) unit,

the RESET pin of the driver is connected directly to one of the port of the MCU. When external charge is brought

near the device (or electrostatic discharge through the device (a spike)), it will discharge by finding its way to the

shortest path to ground.

This discharge sometimes will affect the normal operation of the device, causing data loss inside RAM or internal

registers, or even re-initialize / reset the device. The IC has a built-in protection circuit to protect the I/O pins from

external charge or spike. It can be strengthened by adding an circuitry across the IC Reset pin and MCU port as

figure 1 or figure 2.

In addition, more protection can be done by adding a resistor in series, directly in between the RESET pin of the

driver IC and the port of the MCU. This will create a filter effect, that will be able to eliminate external noise entering

the RESET pin of the driver IC.

Adoption of protection circuit and value of positive components used largely depends on the application printed cir-

cuit board design. It is recommended to test and evaluate to find out the best capacitor value for a particular appli-

cation.

SOLOMON

Application of SSD181X/SSD1815A/SSD1815B to Existing LCD Modules

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