PCF8551 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 2 — 16 February 2015 15 of 54
NXP Semiconductors
PCF8551
Universal 36 × 4 LCD segment driver
The host microcontroller manages the 2-line I
2
C-bus communication channel with the
PCF8551A. The internal oscillator is used and the internal POR is disabled in the
example. The appropriate biasing voltages for the multiplexed LCD waveforms are
generated internally. The only other connections required to complete the system are the
power supplies (V
DD
, V
SS
, and V
LCD
) and the LCD panel chosen for the application.
The host microcontroller manages the 3-line SPI-bus communication channel with the
PCF8551B. The internal oscillator is enabled. The appropriate biasing voltages for the
multiplexed LCD waveforms are generated internally. The only other connections required
to complete the system are the power supplies (V
DD
, V
SS
, and V
LCD
) and the LCD panel
chosen for the application.
The resistance of the power lines must be kept to a minimum. A decoupling capacitor of at least
100 nF is recommended for the supplies.
Fig 8. Typical system configuration using I
2
C-bus, internal power-on reset disabled
The resistance of the power lines must be kept to a minimum. A decoupling capacitor of at least
100 nF is recommended for the supplies.
Fig 9. Typical system configuration using SPI-bus, internal power-on reset enabled
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