PCA9538APWJ NXP Semiconductors, PCA9538APWJ Datasheet - Page 12

• Manufacturer Part Number: PCA9538APWJ
• Description: Interface - I/O Expanders 8bit I2C IO Port
• Manufacturer: NXP Semiconductors

Specifications of PCA9538APWJ

• 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: TSSOP-16
• Operating Current: 160 mA
• Output Current: 25 mA
• Power Dissipation: 200 mW
• Product Type: I/O Expanders

NXP Semiconductors
PCA9538A
Product data sheet
8.1 Minimizing I
8.2 12 V tolerant I/Os
When the I/Os are used to control LEDs, they are normally connected to V
resistor as shown in
I/O V
lower than V
Designs needing to minimize current consumption, such as battery power applications,
should consider maintaining the I/O pins greater than or equal to V
Figure 12
than the LED supply voltage by at least 1.2 V. Both of these methods maintain the I/O V
at or above V
The PCA9538A device SCR group reference diode can go up to 10 V before latch back to
8 V. The ESD gate oxide will protect the device, but not if used continually. Therefore, to
achieve 12 V tolerant I/Os, the external protection circuitry (diode) must be used as shown
in
Fig 12. High value resistor in parallel with
Fig 14. External protection circuitry
Figure
I
is about 1.2 V less than V
14.
the LED
shows a high value resistor in parallel with the LED.
V
DD
DD
DD
Pn
.
DD
All information provided in this document is subject to legal disclaimers.
and prevents additional supply current consumption when the LED is off.
when the I/Os are used to control LEDs
Figure
Rev. 1 — 28 September 2012
LED
11. Since the LED acts as a diode, when the LED is off the
Low-voltage 8-bit I
002aag164
A0
A1
RESET
P0
P1
P2
P3
V
100 kΩ
SS
DD
. The supply current, I
PCA9538A
V
DD
SDA
SCL
V
INT
DD
P7
P6
P5
P4
Fig 13. Device supplied by a lower voltage
2
C-bus I/O port with interrupt and reset
+5 V
002aah421
DD
+12 V
, increases as V
3.3 V
V
DD
Figure 13
Pn
DD
PCA9538A
when the LED is off.
5 V
002aag165
© NXP B.V. 2012. All rights reserved.
shows V
DD
I
LED
becomes
through a
DD
12 of 37
less
I