PCF8536AT datasheet(16/53 Pages) NXP

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NXP Semiconductors

PCA8551

Automotive 36 × 4 LCD segment driver

HOST

MICRO-

CONTROLLER

R ≤

2Cb

SDA

SCL

36 segment drives

4 backplanes

LCD PANEL

(up to 144

elements)

PCA8551A

VDD

VSS

aaa-013190

VLCD

VDD

CLK

n.c.

PORE

100 nF

RST

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.

Figure 9. Typical system configuration using I2C-bus, internal power-on reset disabled

The host microcontroller manages the 2-line I2C-bus communication channel with

the PCA8551A. 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 reset, the power supplies (VDD, VSS, and VLCD) and the LCD panel chosen for the

application.

HOST

MICRO-

CONTROLLER

SDIO

SCL

36 segment drives

4 backplanes

LCD PANEL

(up to 144

elements)

PCA8551B

VDD

VSS

aaa-013191

VLCD

VDD

CLK

n.c.

PORE

100 nF

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.

Figure 10. Typical system configuration using SPI-bus, internal power-on reset enabled

The host microcontroller manages the 3-line SPI-bus communication channel with the

PCA8551B. 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 (VDD, VSS, and VLCD) and the

LCD panel chosen for the application.

8.1 LCD bias generator

Fractional LCD biasing voltages are obtained from an internal voltage divider of three

impedances connected between VLCD and VSS. These intermediate levels are tapped

PCA8551

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 3.1 — 3 May 2021

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