PCF8545ATT datasheet(83/103 Pages) NXP

83 / 103 page

PCA8530

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Product data sheet

Rev. 2 — 25 September 2014

83 of 103

NXP Semiconductors

PCA8530

Automotive 102 x 4 Chip-On-Glass LCD segment driver

The other PCA8530 devices are having the OSC pin connected to VDD1, meaning that

these devices are ready to receive an external clock signal which is provided by the

master device with subaddress A[1:0] = 00.

If the master is providing the clock signal to the slave devices, care must be taken that the

sending of display enable or disable will be received by both, the master and the slaves at

the same time. When the display is disabled, the output from pin CLK is disabled too. The

disconnection of the clock may result in a DC component for the display.

In cascaded applications that use an external clock, all devices have the OSC pin

connected to VDD1 and thus an external CLK being provided for the system (all devices

connected to the same external CLK).

15.2.3 Display data

The storage of display data is determined by the contents of the device address register

(see Section 8.2.3 on page 11). Storage is allowed only when the content of the device

address register matches with the hardware device address applied to the pins A0 and

A1. If the content of the device address register and the hardware device address do not

match, data storage is inhibited but the data pointer is incremented as if data storage had

taken place. The hardware device address must not be changed while the device is being

accessed on the interface.

15.2.4 Data read

Only when the content of the device address register (see Section 8.2.3 on page 11)

matches with the hardware device address applied to the pins A0 and A1, the temperature

or device status readout (see Section 8.2.7 on page 13) is activated. If the content of the

device address register and the hardware device address do not match, the data output

pin (SDA or SDO) of the device is in 3-state. With this, bus conflicts and incorrect reading

is prevented.

PCF8545ATT датащи(PDF) 83 Page - NXP Semiconductors