PCAL9555AHF,128 NXP Semiconductors, PCAL9555AHF,128 Datasheet - Page 21

• Manufacturer Part Number: PCAL9555AHF,128
• Description: Interface - I/O Expanders
• Manufacturer: NXP Semiconductors

Specifications of PCAL9555AHF,128

• Rohs: yes
• 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: HWQFN-24
• Operating Current: 160 mA
• Output Current: 25 mA
• Power Dissipation: 200 mW
• Product Type: I/O Expanders

NXP Semiconductors
PCAL9555A
Product data sheet
Fig 16. Simplified output stage
Current Control
register
8.2 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 with
Configuration
Output port
register
register
the LED
shows a simplified output stage. The behavior of the pad is affected by the
V
PMOS_EN[3:0]
NMOS_EN[3:0]
DD
Pn
All information provided in this document is subject to legal disclaimers.
Low-voltage 16-bit GPIO with Agile I/O, interrupt and weak pull-up
Rev. 1 — 3 October 2012
LED
NMOS_EN3
NMOS_EN2
NMOS_EN1
NMOS_EN0
PMOS_EN0
PMOS_EN1
PMOS_EN2
PMOS_EN3
002aag164
100 kΩ
V
DD
Fig 15. Device supplied by a lower voltage
V
DD
3.3 V
V
DD
PCAL9555A
Pn
5 V
002aag165
© NXP B.V. 2012. All rights reserved.
P0_0 to P0_7
P1_0 to P1_7
LED
002aah431
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