PCF8813 datasheet(38/72 Pages) PHILIPS

38 / 72 page

2004 Mar 05

Philips Semiconductors

Product speciﬁcation

(67 + 1)

× 102 pixels matrix LCD driver

PCF8813

12 TEMPERATURE COMPENSATION

Due to the temperature dependency of the liquid crystal viscosity, the LCD controlling voltage VLCD must be increased

at lower temperatures to maintain optimum contrast. Figure 36 shows VLCD for high multiplex rates. In the PCF8813 the

temperature coefficient to be applied to VLCD can be selected from four values by setting bits TC[1:0].

13 LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 60134); see notes 1 and 2

Notes

1. Stresses above those listed under limiting values may cause permanent damage to the device.

2. Parameters are valid over operating temperature range unless otherwise specified; all voltages are with respect to

VSS unless otherwise specified.

3. VDD2 and VDD3 are always equal.

14 HANDLING

Inputs and outputs are protected against electrostatic discharge in normal handling. However, to be totally safe, it is

desirable to take normal precautions appropriate to handling MOS devices (see

“Handling MOS devices”).

SYMBOL

PARAMETER

MIN.

MAX.

UNIT

VDD1

supply voltage

−0.5

+6.5

VDD2, VDD3

supply voltage (voltage multiplier); see note 3

−0.5

+4.5

VLCD

LCD supply voltage

−0.5

+9.0

input voltage (any pad)

−0.5

VDD + 0.5

ISS

ground supply current

−50

+50

II, IO

DC input or output current

−10

+10

Ptot

total power dissipation

−

300

power dissipation per output

−

Tstg

storage temperature

−65

+150

°C

junction temperature

−

150

°C

handbook, full pagewidth

MGT848

VLCD

Fig.36 VLCD as a function of liquid crystal temperature.

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