PCA9555AHF,128 NXP Semiconductors, PCA9555AHF,128 Datasheet - Page 8

• Manufacturer Part Number: PCA9555AHF,128
• Description: Interface - I/O Expanders
• Manufacturer: NXP Semiconductors

Specifications of PCA9555AHF,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
PCA9555A
Product data sheet
Fig 6.
At power-on reset, all registers return to default values.
Simplified schematic of the I/Os (P0_0 to P0_7, P1_0 to P1_7)
write configuration
write polarity
shift register
shift register
shift register
write pulse
read pulse
6.3 I/O port
data from
data from
data from
pulse
pulse
When an I/O is configured as an input, FETs Q1 and Q2 are off, which creates a
high-impedance input. The input voltage may be raised above V
If the I/O is configured as an output, Q1 or Q2 is enabled, depending on the state of the
Output port register. In this case, there are low-impedance paths between the I/O pin and
either V
recommended levels for proper operation.
configuration
register
D
CK
FF
DD
Q
Q
or V
SS
All information provided in this document is subject to legal disclaimers.
. The external voltage applied to this I/O pin should not exceed the
Low-voltage 16-bit I
output port
register
D
CK
Rev. 1 — 11 September 2012
FF
Q
input port
register
polarity inversion
register
D
CK
D
CK
FF
FF
Q
Q
2
C-bus I/O port with interrupt and weak pull-up
Q1
Q2
100 kΩ
DD
to a maximum of 5.5 V.
PCA9555A
output port
register data
V
P0_0 to P0_7
P1_0 to P1_7
V
input port
register data
to INT
polarity inversion
register data
DD
SS
© NXP B.V. 2012. All rights reserved.
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