PCF8531_1008 Datasheet, PDF (25/51 Pages) NXP Semiconductors – 34 x 128 pixel matrix driver

NXP Semiconductors
V_LCD
PCF8531
34 x 128 pixel matrix driver
mgs473
0 °C
T
Fig 13. V_LCD as a function of liquid crystal temperature
Linear temperature compensation is supported in the PCF8531. The temperature
coefficient of V_LCD can be selected from eight values by setting bits TC[2:0] (see
Table 13).
Table 11. Instruction set
Instruction
I²C-bus
I²C-bus command byte
command^[1]
RS R/W DB7 DB6 DB5 DB4
H1 and H0 = don’t care (H independent command page)
NOP
0
0
0
0
0
0
write data
1
0
D7 D6 D5 D4
set default H[1:0] 0
0
0
0
0
0
H1 = 0 and H0 = 0 (function and RAM command page)
instruction set
0
0
0
0
0
0
function set
0
0
0
0
1
0
set Y address of 0
0
0
1
0
0
RAM
set X address of 0
0
1
X6 X5 X4
RAM
H1 = 0 and H0 = 1 (display setting command page)
multiplex rate
0
0
0
0
0
0
display control
0
0
0
0
0
0
bias system
0
0
0
0
0
1
H1 = 1 and H0 = 0 (HV-gen command page)
HV-gen control
0
0
0
0
0
0
HV-gen
configuration
0
0
0
0
0
0
DB3
0
D3
0
1
0
0
X3
0
1
0
0
1
DB2
0
D2
0
0
PD
Y2
X2
1
D
BS2
1
0
DB1
0
D1
0
H1
V
Y1
X1
M1
IM
BS1
PRS
S1
DB0
0
D0
1
H0
0
Y0
X0
M0
E
BS0
HVE
S0
Description
no operation
write data to
display RAM
select H[1:0] = 0
select command
page
power-down
control; entry
mode
Set Y address of
RAM; 0 ≤ Y ≤ 5
Set X address of
RAM; 0 ≤ X ≤ 127
set multiplex rate
set display
configuration
set bias system
(BSx)
set V_LCD
programming
range
set voltage
multiplication
factor
PCF8531
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 05 — 10 August 2010
© NXP B.V. 2010. All rights reserved.
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