AN11566
Driving an LED backlight, a buzzer, implementing a charge
pump and a low-power system by the PCF8551 and PCF8553
Rev. 1 — 27 June 2014 Application note
Document information
Info Content
Keywords PCF8551, PCF8553, buzzer, charge pump, power-on reset, driving LED
backlight
Abstract The PCF8551 and PCF8553 devices are capable of driving a backlight
LED and/or an electroacoustic converter like a buzzer or speaker circuit.
Additionally a simple charge pump for low supply voltage operation is
sketched out. The application note lists some variants of implementing
these features.
AN11566 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Application note Rev. 1 — 27 June 2014 2 of 18
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NXP Semiconductors
AN11566
PCF8551 and PCF8553 applications
Revision history
Rev Date Description
v1 20140627 initial version