PCF8531U Ver la hoja de datos (PDF) - Philips Electronics
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PCF8531U Datasheet PDF : 44 Pages
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Philips Semiconductors
34 × 128 pixel matrix driver
Product speciï¬cation
PCF8531
8.18.2 FUNCTION SET
8.18.2.1 PD
When PD = 1, the Power-down mode of the LCD driver is
active:
• All LCD outputs at VSS (display off)
• Power-on reset detection active, oscillator off
• VLCD can be disconnected
• I2C-bus is operational, commands can be executed
• RAM contents not cleared; RAM data can be written
• Register settings remain unchanged.
8.18.2.2 V
When V = 0 the horizontal addressing is selected.
The data is written into the DDRAM as shown in Fig.7.
When V = 1 the vertical addressing is selected. The data
is written into the DDRAM as shown in Fig.6. Icon data is
written independently of V when Y address is 5.
8.18.3 SET Y ADDRESS
Y2, Y1 and Y0 defines the Y address vector of the display
RAM.
8.18.4 SET X ADDRESS
The X address points to the columns. The range of X is
0 to 127 (7FH).
8.18.5 SET MULTIPLEX RATE
M[1:0] selects the multiplex rate (see Table 8).
8.18.6 DISPLAY CONTROL (D, E AND IM)
Bits D and E select the display mode (see Table 6). Bit IM
sets the display to icon mode.
8.18.7 SET BIAS SYSTEM
Different multiplex rates require different bias settings.
These are programmed by BS[2:0], which sets the binary
number n. The optimum value for n is given by
n = Mux rate – 3
Supported values of n are given in Table 2. Table 3 shows
the intermediate bias voltages.
Table 1 Y address
Y2
Y1
0
0
0
0
0
1
0
1
1
0
1
0
Y0
BANK
0
0
1
1
0
2
1
3
0
4
1
5 (icons)
Table 2 Programming the required bias system
BS[2]
BS[1]
BS[0]
n
0
0
0
7
0
0
1
6
0
1
0
5
0
1
1
4
1
0
0
3
1
0
1
2
1
1
0
1
1
1
1
0
BIAS SYSTEM
1â„11
1â„10
1â„9
1â„8
1â„7
1â„6
1â„5
1â„4
COMMENT
recommended for 1 : 34
recommended for 1 : 26
recommended for 1 : 17
recommended for icon mode
1999 Aug 10
13
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