PCAL6408AHKX NXP Semiconductors, PCAL6408AHKX Datasheet - Page 19

• Manufacturer Part Number: PCAL6408AHKX
• Description: Interface - I/O Expanders 8bit I2C/SMBus IO Expander w/Interrupt
• Manufacturer: NXP Semiconductors

Specifications of PCAL6408AHKX

• Maximum Operating Frequency: 100 kHz
• Operating Supply Voltage: 1.65 V to 5.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Package / Case: XQFN-16
• Operating Current: 200 mA
• Output Current: 25 mA
• Product Type: I/O Expanders

NXP Semiconductors
PCAL6408A
Product data sheet
Fig 16. Simplified output stage
Current Control
register
9.2 Output drive strength control
DECODER
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 16
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 14. High-value resistor in parallel
Configuration
Output port
register
register
V
with the LED
shows a simplified output stage. The behavior of the pad is affected by the
PMOS_EN[3:0]
NMOS_EN[3:0]
DD(P)
Pn
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 6 December 2012
LED
Low-voltage translating, 8-bit I
NMOS_EN3
NMOS_EN2
NMOS_EN1
NMOS_EN0
PMOS_EN0
PMOS_EN1
PMOS_EN2
PMOS_EN3
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100 kΩ
V
DD
Fig 15. Device supplied by a lower voltage
V
DD(P)
V
2
3.3 V
C-bus/SMBus I/O expander
DD(P)
PCAL6408A
Pn
5 V
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© NXP B.V. 2012. All rights reserved.
P0 to P7
LED
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