PCF8537 datasheet(55/82 Pages) NXP

55 / 82 page

PCF8537

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Product data sheet

Rev. 1 — 31 May 2012

55 of 82

NXP Semiconductors

PCF8537

Industrial LCD driver for multiplex rates up to 1:8

9.2.6 Input filters

To enhance noise immunity in electrically adverse environments, RC low-pass filters are

provided on the SDA and SCL lines.

9.2.7 I2C-bus slave address

The device selection depends on the I2C-bus slave address.

Two different I2C-bus slave addresses can be used to address the PCF8537AH (see

Table 31).

Bit 1 of the slave address is defined by connecting the input A0 to either VSS (logic 0) or

VDD (logic 1). Therefore, two instances of PCF8537AH can be distinguished on the same

I2C-bus.

The least significant bit of the slave address byte is bit R/W (see Table 32).

[1]

Only used for temperature readout from PCF8537AH (see Table 20 on page 15).

9.2.8 I2C-bus protocol

The I2C-bus protocol is shown in Figure 46. The sequence is initiated with a START

condition (S) from the I2C-bus master which is followed by one of the two PCF8537AH

slave addresses available. All PCF8537AH’s with the corresponding A0 level

acknowledge in parallel to the slave address, but all PCF8537AH with an alternative A0

level ignore the whole I2C-bus transfer.

After acknowledgement, a control byte follows (see Section 9.1 on page 52).

Table 31.

I2C slave address byte

Slave address

Bit

MSB

LSB

011

100

R/W

Table 32.

R/W bit description

Symbol

Value

Description

R/W

data read or write selection

write data

read data[1]

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