PCF2119RUSLASH2 datasheet(45/68 Pages) PHILIPS

45 / 68 page

2003 Jan 30

Philips Semiconductors

Product speciﬁcation

LCD controllers/drivers

PCF2119X

16.2

Charge pump characteristics

Typical graphs of the total power consumption of the

PCF2119x using the internal charge pump are illustrated

in Figs.34 to 36.

The graphs were obtained under the following conditions:

• Tamb =25 °C

• VDD1 =VDD2 =VDD3 = 2.2 V (min.), 2.7 V (typ.) and 4 V

(max.)

• Normal mode

• fosc = internal oscillator

• Mux 1 : 18

• Typical current load for ILCD =10 µA.

For each multiplication factor there is a separate line. The

line ends where it is not possible to get a higher voltage

under its conditions (a higher multiplication factor is

needed to get higher voltages).

Connecting different displays may result in different

current consumption. This affects the efficiency and the

optimum multiplication factor to be used to generate a

certain output voltage.

handbook, full pagewidth

100

150

200

250

300

350

400

2.75

3.5

4.25

5.75

6.5

7.25

Vop (V)

IDD

(

µA)

(1)

(2)

(3)

MGW573

Fig.34 Typical charge pump characteristics for VDD = 2.2 V.

(1) 2

× multiplication factor.

(2) 3

× multiplication factor.

(3) 4

× multiplication factor.

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