PCF2119RU2DB2 datasheet(57/83 Pages) NXP

57 / 83 page

PCF2119X

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Product data sheet

Rev. 7 — 15 November 2010

57 of 83

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 42, Figure 43 and Figure 44.

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.

Table 37.

Reducing current consumption

Original mode

Alternative mode

character mode

icon mode (control bit IM)

display on

display off (control bit D)

VLCD generator operating

direct mode

any mode

power-down mode (pin PD)

(1) 2

× multiplication factor.

(2) 3

× multiplication factor.

(3) 4

× multiplication factor.

Fig 42. 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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