PCAL6408APW datasheet(7/48 Pages) NXP

Part #	PCAL6408APW

Description	Low-voltage translating, 8-bit I2C-bus/SMBus I/O expander with interrupt output, reset, and configuration registers

PDF	48 Pages

Scroll/Zoom	100%

Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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7 / 48 page

PCAL6408A

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Product data sheet

Rev. 2 — 6 December 2012

7 of 48

NXP Semiconductors

PCAL6408A

Low-voltage translating, 8-bit I2C-bus/SMBus I/O expander

Voltage translation

Table 4 shows how to set up VDD levels for the necessary voltage translation between the

I2C-bus and the PCAL6408A.

Functional description

Refer to Figure 1 “Block diagram (positive logic)”.

7.1 Device address

The address of the PCAL6408A is shown in Figure 5.

ADDR is the hardware address package pin and is held to either HIGH (logic 1) or LOW

(logic 0) to assign one of the two possible slave addresses. The last bit of the slave

address defines the operation (read or write) to be performed. A HIGH (logic 1) selects a

read operation, while a LOW (logic 0) selects a write operation.

Table 4.

Voltage translation

VDD(I2C-bus) (SDA and SCL of I2C master)

VDD(P) (Port P)

1.8V

2.5V

1.8V

3.3V

1.8V

2.5V

1.8V

2.5V

3.3V

2.5V

3.3V

1.8V

3.3V

2.5V

3.3V

1.8V

2.5V

3.3V

Fig 5.

PCAL6408A address

R/W

002aaf539

fixed

slave address

programmable

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