PCF2111CP datasheet(11/24 Pages) PHILIPS

11 / 24 page

1997 Mar 28

Philips Semiconductors

Product speciﬁcation

LCD drivers

PCF21xxC family

7.6

Input circuitry

7.7

Expansion

Fig.10 Input circuitry.

VSS line is common. In systems where it is expected that VDD2 >VDD1 + 0.5 V, a resistor should be inserted to reduce the current flowing through the

input protection. Maximum input current

≤40 µA.

handbook, halfpage

BUS DRIVER

PCF21XXC

100 k

Ω

VSS

VDD2

VDD

VSS

MLD284

Fig.11 Expansion possibility (using PCF2111C).

By connecting OSC to VSS the BP pins become inputs and generate signals synchronized to the single oscillator frequency, thus allowing expansion of

several members of the PCF21xxC family up to the BP drive capability of the master. The PCF2112C can only function as a master for other PCF2112Cs.

handbook, full pagewidth

DLEN

OSC

CLB

DATA

BP2

S1 to S32

BP1

VSS

PCF2111C

SLAVE1

DLEN

OSC

CLB

DATA

BP2

S1 to S32

BP1

VSS

PCF2111C

SLAVE1

DLEN

OSC

CLB

DATA

BP2

S1 to S32

BP1

VSS

VDD

PCF2111C

MASTER

LCD

MLD293

DATA

CLB

DLEN1

DLEN2

DLEN3

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