PCF8536AT datasheet(38/103 Pages) NXP

38 / 103 page

PCA8530

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Product data sheet

Rev. 2 — 25 September 2014

38 of 103

NXP Semiconductors

PCA8530

Automotive 102 x 4 Chip-On-Glass LCD segment driver

It has to be considered that the driving capability of the charge pump is depending on the

resistance of the Indium Tin Oxide (ITO) tracks, see Figure 20 and Figure 19.

Conditions: VDD2 = 5.0 V, RITO(VSS2), RITO(VDD2), RITO(VLCDOUT) =50 , Tamb =27 C.

Charge pump configuration:

(1) VLCD =2  VDD2.

(2) VLCD =3  VDD2.

(3) VLCD =4  VDD2.

(4) VLCD =5  VDD2.

Iload is the overall current sink by the segment and backplane outputs depending on the display,

plus the on-chip VLCD current consumption.

Reading example: VLCD can be programmed to 10 V by using the charge pump configuration (2)

or (3). With configuration (2), VLCD can be programmed to 10 V for a current load up to about

780

A. With configuration (3), V

LCD can be programmed to 10 V for a current load up to about

940

A.

Remark: The charge pump configuration (4) has no benefit compared to configuration (3) and is

therefore not recommended when VDD2 =5.0 V.

Fig 18. Charge pump driving capability with VDD2 =5.0 V

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