PCAL6408AEX datasheet(21/59 Pages) NXP

No. de pieza	PCAL6408AEX

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

PDF	59 Pages

Scroll/Zoom	100%

Fabricante Electrónico	NXP [NXP Semiconductors]

Página de inicio	http://www.nxp.com

Logo

21 / 59 page

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

Document feedback

21 / 59

PCAL6408AEX Datasheet(PDF) 21 Page - NXP Semiconductors