PCF8537 datasheet(48/82 Pages) NXP

48 / 82 page

PCF8537

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Product data sheet

Rev. 1 — 31 May 2012

48 of 82

NXP Semiconductors

PCF8537

Industrial LCD driver for multiplex rates up to 1:8

When bit IBS is set to bank 1 (see Table 18 on page 14), then data is stored in row 4 and

row 5.

8.8.4 RAM filling in 1:4 multiplex drive mode

In the 1:4 multiplex drive mode the eight transmitted data bits are placed in two

successive display RAM columns of four rows (see Figure 36). In order to fill the whole

four RAM rows 22 bytes need to be sent to the PCF8537.

When bit IBS is set to bank 1 (see Table 18 on page 14), then data is stored in rows 4 to

row 7.

8.8.5 RAM filling in 1:6 multiplex drive mode

In the 1:6 multiplex drive mode the RAM is organized in six rows and 46 columns. The

eight transmitted data bits are placed in such a way, that a column is filled up (see

Figure 37). The remaining bits are wrapped up into the next column. In order to fill the

whole RAM addresses 35 bytes need to be sent to the PCF8537, however the four least

significant bits of the 35th byte are discarded.

Fig 36. Display RAM filling order in 1:4 multiplex drive mode

39 40 41 42 43

MSB

LSB

transmitted data byte

display RAM columns/segment outputs (S)

columns

display RAM rows/

backplane outputs

(BP)

rows

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PCF8537 데이터시트(PDF) 48 Page - NXP Semiconductors