PCF8534AHLSLASH1 datasheet(35/47 Pages) NXP

Teilenummer	PCF8534AHL/1

Bauteilbeschribung	Universal LCD driver for low multiplex rates

PDF	47 Pages

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Hersteller	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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35 / 47 page

PCF8534A_5

Product data sheet

Rev. 05 — 6 August 2009

35 of 47

NXP Semiconductors

PCF8534A

Universal LCD driver for low multiplex rates

The contact resistance between the SYNC pins of cascaded devices must be controlled. If

the resistance is too high, the device will not be able to synchronize properly.

Table 19 shows the maximum contact resistance values.

Fig 23. Synchronization of the cascade for various PCF8534A drive modes

Table 19.

SYNC contact resistance

Number of devices

Maximum contact resistance

6000

Ω

3 to 5

2200

Ω

6 to 10

1200

Ω

11 to 16

700

Ω

Tfr = f

BP0

SYNC

BP0

(1/2 bias)

SYNC

BP0

(1/3 bias)

(a) static drive mode.

(b) 1:2 multiplex drive mode.

(d) 1:4 multiplex drive mode.

BP0

(1/3 bias)

SYNC

BP0

(1/3 bias)

mgl755

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