PCF2119X Datasheet, PDF (45/68 Pages) NXP Semiconductors – LCD controllers/drivers

Philips Semiconductors
LCD controllers/drivers
Product specification
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:
• T_amb = 25 °C
• V_DD1 = V_DD2 = V_DD3 = 2.2 V (min.), 2.7 V (typ.) and 4 V
(max.)
• Normal mode
• f_osc = internal oscillator
• Mux 1 : 18
• Typical current load for I_LCD = 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.
400
handbook, full pa_IDge_Dwidth
(µA)
350
MGW573
300
(2)
250
200
(3)
150
(1)
100
50
0
0
2.75
3.5
4.25
5
5.75
6.5
7.25
Vop (V)
(1) 2 × multiplication factor.
(2) 3 × multiplication factor.
(3) 4 × multiplication factor.
Fig.34 Typical charge pump characteristics for V_DD = 2.2 V.
2003 Jan 30
45