PCF2119FUSLASH2SLASHF2 datasheet(54/79 Pages) NXP

54 / 79 page

PCF2119X_5

Product data sheet

Rev. 05 — 13 August 2009

54 of 79

NXP Semiconductors

PCF2119x

LCD controllers/drivers

16.6 Charge pump characteristics

Typical graphs of the total power consumption of the PCF2119x using the internal charge

pump are illustrated in Figure 41, Figure 42 and Figure 43.

The graphs were obtained under the following conditions:

• Tamb = 25 °C

• VDD1 = VDD2 = VDD3 = 2.2 V (minimum), 2.7 V (typical) and 4.0 V (maximum)

• Normal mode

• fosc = internal oscillator

• multiplex drive mode 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.

(1) 2

× multiplication factor.

(2) 3

× multiplication factor.

(3) 4

× multiplication factor.

Fig 41. Typical charge pump characteristics (a), VDD = 2.2 V

VLCD (V)

1.25

7.25

5.75

4.25

2.75

mgw573

300

200

100

400

IDD

(

µA)

(1)

(2)

(3)

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