PCF8545ATT datasheet(23/54 Pages) NXP

23 / 54 page

PCA85233

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Product data sheet

Rev. 5 — 12 November 2018

23 of 54

NXP Semiconductors

PCA85233

Automotive 80 × 4 LCD driver for low multiplex rates

7.9 Backplane outputs

The LCD drive section includes four backplane outputs: BP0 to BP3. The backplane

output signals are generated in accordance with the selected LCD drive mode.

• In the 1:4 multiplex drive mode BP0 to BP3 must be connected directly to the LCD.

If less than four backplane outputs are required the unused outputs can be left

open-circuit.

• In 1:3 multiplex drive mode: BP3 carries the same signal as BP1; therefore, these two

adjacent outputs can be tied together to give enhanced drive capabilities.

• In 1:2 multiplex drive mode: BP0 and BP2, respectively, BP1 and BP3 carry the same

signals and can also be paired to increase the drive capabilities.

• In static drive mode: The same signal is carried by all four backplane outputs; and

they can be connected in parallel for very high drive requirements.

7.10 Segment outputs

The LCD drive section includes 80 segment outputs (S0 to S79) which must be connected

directly to the LCD. The segment output signals are generated in accordance with the

multiplexed backplane signals and with data residing in the display register. When less

than 80 segment outputs are required the unused segment outputs must be left

open-circuit.

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