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NXP Semiconductors
PCA85132
LCD driver for low multiplex rates
7.4 Backplane and segment outputs
7.4.1 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, BP1 and BP3 respectively carry the same
signals and may 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.
The pins for the four backplanes BP0 to BP3 are available on both pin bars of the chip. In
applications, it is possible to use either the pins for the backplanes
? on the top pin bar
? on the bottom pin bar
? or both of them to increase the driving strength of the device.
When using all backplanes available they may be connected to the respective sibling
(BP0 on the top pin bar with BP0 on the bottom pin bar, and so on).
7.4.2 Segment outputs
The LCD drive section includes 160 segment outputs (S0 to S159) which must be
connected directly to the LCD. The segment output signals are generated in accordance
with the multiplexed backplane signals and with data resident in the display register.
When less than 160 segment outputs are required, the unused segment outputs must be
left open-circuit.
7.5 Display RAM
The display RAM is a static 160 ? 4 bit RAM which stores LCD data. There is a one-to-one
correspondence between
? the bits in the RAM bitmap and the LCD elements
? the RAM columns and the segment outputs
? the RAM rows and the backplane outputs.
A logic 1 in the RAM bitmap indicates the on-state of the corresponding LCD element;
similarly, a logic 0 indicates the off-state.
PCA85132
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 11 July 2013
? NXP B.V. 2013. All rights reserved.
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