PCF21XXC_FAM

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© NXP Semiconductors N.V. 2015. All rights reserved.

Product data sheet

Rev. 3 — 6 May 2015

8 of 25

NXP Semiconductors

PCF21xxC family

LCD drivers

7.6 Input circuitry

7.7 Expansion

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 A.

Fig 10. Input circuitry

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.

Fig 11. Expansion possibility (using PCF2111C)