PCA9555AHF,128 NXP Semiconductors, PCA9555AHF,128 Datasheet - Page 15

• 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
8.2 Power-on reset requirements
In the event of a glitch or data corruption, PCA9555A can be reset to its default conditions
by using the power-on reset feature. Power-on reset requires that the device go through a
power cycle to be completely reset. This reset also happens when the device is
powered on for the first time in an application.
The two types of power-on reset are shown in
Table 13
types of power-on reset.
Fig 13. High value resistor in parallel with
Fig 15. V
Fig 16. V
V
DD
ramp-up
V
(dV/dt)
DD
specifies the performance of the power-on reset feature for PCA9555A for both
the LED
V
DD
DD
DD
r
is lowered below 0.2 V or to 0 V and then ramped up to V
is lowered below the POR threshold, then ramped back up to V
Pn
V
I
All information provided in this document is subject to legal disclaimers.
drops below POR levels
Low-voltage 16-bit I
Rev. 1 — 11 September 2012
LED
ramp-down
002aag164
(dV/dt)
100 kΩ
V
ramp-down
DD
f
(dV/dt)
2
C-bus I/O port with interrupt and weak pull-up
to V
f
when V
time to re-ramp
POR(min)
Fig 14. Device supplied by a lower voltage
below 0.2 V or to V
Figure 15
t
DD
d(rst)
when V
time to re-ramp
− 50 mV
drops
t
d(rst)
DD
drops
and
SS
3.3 V
V
Figure
DD
ramp-up
(dV/dt)
Pn
re-ramp-up
(dV/dt)
PCA9555A
16.
r
DD
5 V
002aag165
r
© NXP B.V. 2012. All rights reserved.
DD
LED
002aah330
time
002aah329
15 of 39
time