PCF85134 datasheet(33/40 Pages) NXP

Numer części	PCF85134

Szczegółowy opis	Universal LCD driver for low multiplex rates

PDF	40 Pages

Scroll/Zoom	100%

Producent	NXP [NXP Semiconductors]

Strona internetowa	http://www.nxp.com

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33 / 40 page

PCF85134_1

Product data sheet

Rev. 01 — 17 December 2009

33 of 40

NXP Semiconductors

PCF85134

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 21. Synchronization of the cascade for various PCF85134 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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