PCF2119AUSLASH2DASLASH2 datasheet(9/79 Pages) NXP

9 / 79 page

PCF2119X_5

Product data sheet

Rev. 05 — 13 August 2009

9 of 79

NXP Semiconductors

PCF2119x

LCD controllers/drivers

8.4.1 Programming ranges

Possible values for VA and VB are between 0 to 63.

Remarks:

• Values producing more than 6.5 V at operating temperature are not allowed.

Operation above this voltage may damage the device. When programming the

operating voltage the temperature coefﬁcient of VLCDOUT must be taken into account.

• Values below 2.2 V are below the speciﬁed operating range of the chip and are

therefore not allowed.

When the LCD supply voltage is generated on-chip, the VLCD pins should be decoupled to

VSS with a suitable capacitor. The generated VLCDOUT is independent of VDD and is

temperature compensated.

In Equation 2 the internal charge pump is not considered. However, if the supplied voltage

to VDD2 and VDD3 is below the required VLCD it is necessary to use the internal charge

pump. The multiplication factor has to be set such, that VDD2 and VDD3 (which are equal)

multiplied with the programmed multiplication factor exceeds the required VLCD under all

circumstances (i.e. at low temperatures and along with the temperature compensation -

Table 5.

Values of VA and VB and the corresponding VLCD values

All values at Tref =27 °C; allowed values are highlighted.

Integer values

of VA and VB

Corresponding

value of VLCD in V

Integer values

of VA and VB

Corresponding

value of VLCD in V

Integer values

of VA and VB

Corresponding

value of VLCD in V

VLCD switched off

3.58

5.34

1.90

3.66

5.42

1.98

3.74

5.50

2.06

3.82

5.58

2.14

3.90

5.66

2.22

3.98

5.74

2.30

4.06

5.82

2.38

4.14

5.90

2.46

4.22

5.98

2.54

4.30

6.06

2.62

4.38

6.14

2.70

4.46

6.22

2.78

4.54

6.30

2.86

4.62

6.38

2.94

4.70

6.46

3.02

4.78

6.54

3.10

4.86

6.62

3.18

4.94

6.70

3.26

5.02

6.78

3.34

5.10

6.86

3.42

5.18

3.50

5.26

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