TEST datasheet(19/49 Pages) ETC

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PCAL6408A

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Product data sheet

Rev. 3 — 18 September 2013

19 of 49

NXP Semiconductors

PCAL6408A

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

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 18 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 %.

Fig 16. High-value resistor in parallel

with the LED

Fig 17. Device supplied by a lower voltage

002aah278

LED

VDD(P)

100 kΩ

VDD

002aah279

LED

VDD(P)

3.3 V

5 V

Fig 18. Simplified output stage

VDD(P)

P0 to P7

Configuration

002aah093

DECODER

PMOS_EN0

PMOS_EN1

PMOS_EN2

PMOS_EN3

NMOS_EN3

NMOS_EN2

NMOS_EN1

NMOS_EN0

Output port

Current Control

PMOS_EN[3:0]

NMOS_EN[3:0]

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