PCD8544 datasheet(16/32 Pages) PHILIPS

16 / 32 page

1999 Apr 12

Philips Semiconductors

Product speciﬁcation

× 84 pixels matrix LCD controller/driver

PCD8544

Table 4

Programming the required bias system

Table 5

LCD bias voltage

BS2

BS1

BS0

RECOMMENDED

MUX RATE

0007

1 : 100

0016

1 : 80

0105

1 : 65/1 : 65

0114

1 : 48

1003

1 : 40/1 : 34

1012

1 : 24

1101

1 : 18/1 : 16

1110

1 : 10/1 : 9/1 : 8

SYMBOL

BIAS VOLTAGES

BIAS VOLTAGE FOR 1

⁄8 BIAS

VLCD

(n + 3)/(n + 4)

⁄8 × VLCD

(n + 2)/(n + 4)

⁄8 × VLCD

2/(n + 4)

⁄8 × VLCD

1/(n + 4)

⁄8 × VLCD

VSS

8.9

Set VOP value

The operation voltage VLCD can be set by software.

The values are dependent on the liquid crystal selected.

VLCD =a+(VOP6 to VOP0) × b [V]. In the PCD8544,

a = 3.06 and b = 0.06 giving a program range of

3.00 to 10.68 at room temperature.

Note that the charge pump is turned off if VOP6 to VOP0 is

set to zero.

For Mux 1 : 48, the optimum operation voltage of the liquid

can be calculated as:

(2)

where Vth is the threshold voltage of the liquid crystal

material used.

Caution, as VOP increases with lower temperatures,

care must be taken not to set a VOP that will exceed the

maximum of 8.5 V when operating at

−25 °C.

LCD

148

----------

–





⋅

--------------------------------------- V

⋅

6.06 V

⋅

Fig.14 VOP programming.

a = 3.06.

b = 0.06.

VOP6 to VOP0 (programmed) [00 to 7FH].

handbook, halfpage

MGL643

00 01 02 03 04 05 06 07 08 09 0A ...

VLCD

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