PCAL6408APW datasheet(21/59 Pages) NXP

Part #	PCAL6408APW

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

PDF	59 Pages

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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NXP Semiconductors

PCAL6408A

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

configuration registers

002aah278

LED

VDD(P)

VDD

Figure 17. High-value resistor in parallel with the LED

002aah279

LED

VDD(P)

3.3 V

5 V

Figure 18. Device supplied by a lower voltage

9.2 Output drive strength control

The Output drive strength registers allow the user to control the output drive level of the GPIO. Each GPIO can

be configured independently to one of the four possible output current levels. By programming these bits the

user is changing the number of transistor pairs or ‘fingers’ that drive the I/O pad.

Figure 19 shows a simplified output stage. The behavior of the pad is affected by the Configuration register, the

output port data, and the current control register. When the Current Control register bits are programmed to 10b,

then only two of the fingers are active, reducing the current drive capability by 50 %.

PCAL6408A

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

Product data sheet

Rev. 3.3 — 14 October 2024

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PCAL6408APW Datasheet(PDF) 21 Page - NXP Semiconductors