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NXP Semiconductors
PCA85132
LCD driver for low multiplex rates
7. Functional description
The PCA85132 is a versatile peripheral device designed to interface between any
microcontroller to a wide variety of LCD segment or dot matrix displays. It can directly
drive any static or multiplexed LCD containing up to four backplanes and up to
160 segments.
7.1 Commands of PCA85132
Table 5.
Definition of PCA85132 commands
Command
Operation code
Reference
Bit
mode-set
load-data-pointer-MSB
load-data-pointer-LSB
device-select
7
1
0
0
1
6
1
0
1
1
5
0
0
0
1
4
0
0
0
0
3
E
P[7:4]
P[3:0]
0
2
B
0
1
M[1:0]
A[1:0]
0
bank-select
1
1
1
1
1
0
I
O
blink-select
frequency-ctrl
1
1
1
1
1
1
1
0
0
1
AB
F[2:0]
BF[1:0]
7.1.1 Command: mode-set
The mode-set command allows configuring the multiplex mode, the bias levels and
enabling or disabling the display.
Table 6.
Mode-set - command bit description
Bit
7 to 4
3
2
1 to 0
Symbol
-
E
B
M[1:0]
Value
1100
0 [2]
1
0 [2]
1
01
10
11
00 [2]
Description
fixed value
display status [1]
disabled (blank) [3]
enabled
LCD bias configuration [4]
1 ? 3 bias
1 ? 2
bias
LCD drive mode selection
static; BP0
1:2 multiplex; BP0, BP1
1:3 multiplex; BP0, BP1, BP2
1:4 multiplex; BP0, BP1, BP2, BP3
[1]
[2]
[3]
[4]
The possibility to disable the display allows implementation of blinking under external control. The enable
bit determines also whether the internal clock signal is available at the CLK pin (see Section 7.1.6.2 on
Default value.
The display is disabled by setting all backplane and segment outputs to V LCD .
Not applicable for static drive mode.
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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