PCA8538UG(2014) 查看數據表（PDF） - NXP Semiconductors.

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PCA8538UG
(Rev.:2014)

Automotive 102 x 9 Chip-On-Glass LCD segment driver

NXP Semiconductors. 

NXP Semiconductors

PCA8538

Automotive 102 x 9 Chip-On-Glass LCD segment driver

8.14.2.2 RAM filling in 1:2 multiplex drive mode

In the 1:2 multiplex drive mode the eight transmitted data bits are placed in four

successive display RAM columns of two rows (see Table 41).

Table 41. RAM filling in 1:2 multiplex drive mode

RAM row/ RAM column/Segment output (S)

backplane 0

1

2

3

4

5

6

7

:

output

(COM)

0

aa7 aa5 aa3 aa1 ab7 ab5 ab3 ab1 :

1

aa6 aa4 aa2 aa0 ab6 ab4 ab2 ab0 :

2

-

-

-

-

-

-

-

-

:

:

:

:

:

:

:

:

:

:

:

8

-

-

-

-

-

-

-

-

:

99 100 101

ay1 az7 az5

ay0 az6 az4

-

-

-

:

:

:

-

-

-

In order to fill the whole two RAM rows 26 bytes need to be sent to the PCA8538. Any

data bits that spill over the RAM and additional data bytes sent are discarded.

8.14.2.3 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 Table 42).

Table 42. RAM filling in 1:4 multiplex drive mode

RAM row/ RAM column/Segment output (S)

backplane 0

1

2

3

:

output

(COM)

0

aa7

aa3

ab7

ab3

:

1

aa6

aa2

ab6

ab2

:

2

aa5

aa1

ab5

ab1

:

3

aa4

aa0

ab4

ab0

4

-

-

-

-

:

:

:

:

:

:

:

8

-

-

-

-

:

99

100

101

bx3

by7

by3

bx2

by6

by2

bx1

by5

by1

bx0

by4

by0

-

-

-

:

:

:

-

-

-

In order to fill the whole four RAM rows 51 bytes need to be sent to the PCA8538.

Depending on the start address of the data pointer, there is the possibility for a boundary

condition. This occurs when more data bits are sent than fit into the remaining RAM. The

additional data bits are discarded.

PCA8538

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 4 — 26 September 2014

© NXP Semiconductors N.V. 2014. All rights reserved.

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