PCF8536AT datasheet(37/103 Pages) NXP

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PCA8530

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Product data sheet

Rev. 2 — 25 September 2014

37 of 103

NXP Semiconductors

PCA8530

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

Remark: The PCA8530 has a built-in automatic limitation of VLCD, set to 12 V. The

maximum VLCD that can be programmed is expressed by the following equation:

, where n is the multiplication factor of

the charge pump. Iload is the overall current sink by the segments and backplanes outputs

depending on the display, plus the on-chip VLCD current consumption.

With these values, it can be calculated how much current the charge pump can drive

under certain conditions, as shown in Figure 17 and Figure 18.

Table 31.

Output resistance of the charge pump

RITO(VSS2), RITO(VDD2), RITO(VLCDOUT) =50 .

Charge pump configuration

Ro(VLCDOUT) (typical)

Unit

VLCD =2  VDD2

2.5



VLCD =3  VDD2



VLCD =4  VDD2

10.5



VLCD =5  VDD2



Conditions: VDD2 = 3.0 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 segments and backplanes 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 (3)

or (4). With configuration (3), VLCD can be programmed to 10 V for a current load up to about

120

A. With configuration (4), V

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

260

A.

Remark: Only the charge pump configuration (4) allows programming VLCD = 12 V when

VDD2 =3.0 V.

Fig 17. Charge pump driving capability with VDD2 =3.0 V

LCD max



min 12 V, n

DD2

o VLCDOUT



load



–





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