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

8.14.2.4 RAM filling in 1:6 multiplex drive mode

In the 1:6 multiplex drive mode the eight transmitted data bits are placed as shown in

Table 43.

Table 43. RAM filling in 1:6 multiplex drive mode

RAM row/ RAM column/Segment output (S)

backplane 0

1

2

3

:

output

(COM)

0

aa7

aa1

ab3

ac5

:

1

aa6

aa0

ab2

ac4

:

2

aa5

ab7

ab1

ac3

:

3

aa4

ab6

ab0

ac2

:

4

aa3

ab5

ac7

ac1

:

5

aa2

ab4

ac6

ac0

:

6

-

-

-

-

:

7

-

-

-

-

:

8

-

-

-

-

:

99

100

101

cw5

cx7

cx1

cw4

cx6

cx0

cw3

cx5

cy7

cw2

cx4

cy6

cw1

cx3

cy5

cw0

cx2

cy4

-

-

-

-

-

-

-

-

-

The remaining bits of a byte are wrapped up into the next column. In order to fill the whole

RAM addresses 77 bytes need to be sent to the PCA8538. Any data bits that spill over the

RAM and additional data bytes sent are discarded.

8.14.2.5 RAM filling in 1:8 multiplex drive mode

In the 1:8 multiplex drive mode the eight transmitted data bits are placed into eight rows of

one display RAM column (see Table 44).

Table 44. RAM filling in 1:8 multiplex drive mode

RAM row/

backplane

output

(COM)

RAM column/Segment output (S)

0

1

2

:

0

aa7

ab7

ac7

:

1

aa6

ab6

ac6

:

2

aa5

ab5

ac5

:

3

aa4

ab4

ac4

:

4

aa3

ab3

ac3

:

5

aa2

ab2

ac2

:

6

aa1

ab1

ac1

:

7

aa0

ab0

ac0

:

8

-

-

-

:

99

100

101

dv7

dw7

dx7

dv6

dw6

dx6

dv5

dw5

dx5

dv4

dw4

dx4

dv3

dw3

dx3

dv2

dw2

dx2

dv1

dw1

dx1

dv0

dw0

dx0

-

-

-

In order to fill the whole RAM addresses 102 bytes need to be sent to the PCA8538.

Additional data bytes sent are discarded.

8.14.2.6 RAM filling in 1:9 multiplex drive mode

In the 1:9 multiplex drive mode the transmitted bytes are stored continuously in the eight

RAM rows until RAM column 101 while the data pointer X is automatically wrapped

around from RAM column 0 to RAM column 101 (data pointer Y remains logic 0). Then the

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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