PCA2117DUGSSLASHDA datasheet(57/107 Pages) NXP

57 / 107 page

PCA2117

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Product data sheet

Rev. 4 — 8 April 2015

57 of 107

NXP Semiconductors

PCA2117

Automotive LCD driver for character displays

8.5.4.1

CGRAM addressing

For addressing, the CGRAM the following steps have to be taken (see Figure 31):

• Select the column of the CGRAM (SMB[2:0]) with the Sel_mem_bank command (see

Section 8.1.1.9)

• Set the requested address counter (ADD[6:0]) with the Set_mem_addr command

(see Section 8.1.1.10)

• Write data to the CGRAM with the Write_data command (WD[4:0]) (see

Section 8.1.1.12)

• Read the data from the CGRAM with the Read_data command (RD[4:0]) (see

Section 8.1.1.11)

8.5.4.2

User-defined characters and symbols

User-defined characters can be stored in the CGRAM. The content of the CGRAM is lost

during power-down, therefore the CGRAM has to be rewritten after every power-on.

Below some source code is printed, which shows how a user-defined character can be

coded - in this case the euro currency sign. The display used is a 2 lines by 20 characters

display and the interface is the I2C-bus:

// Write a user-defined character into the CGRAM

startI2C();

// PCA2117 slave address for write, SA0 is connected to VDD

SendI2CAddress(0x76);

// MSB (Continuation bit CO) = 0, no more control bytes will follow, RS[1:0]= 10

// next byte is command byte on register page "10"

i2c_write(0x40);

// 2 lines x 20 chars, 1/18 duty. Next byte will be another command.

i2c_write(0x32);

// Repeated Start condition

startI2C();

SendI2CAddress(0x76);

// MSB (Continuation bit CO) = 0, no more control bytes will follow, RS[1:0]= 00

// next bytes are command bytes on register page "00"

i2c_write(0x00);

// Select Memory Bank 1: Column 0 of CGRAM

Fig 37. User-defined euro currency sign

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