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PCA9535 Datasheet PDF : 34 Pages
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NXP Semiconductors
PCA9535; PCA9535C
16-bit I2C-bus and SMBus, low power I/O port with interrupt
8.1 Minimizing IDD when the I/Os are used to control LEDs
When the PCA9535 I/Os are used to control LEDs, they are normally connected to VDD
through a resistor as shown in Figure 17. Since the LED acts as a diode, when the LED is
off the I/O VI is about 1.2 V less than VDD. The supply current, IDD, increases as VI
becomes lower than VDD.
Designs needing to minimize current consumption, such as battery power applications,
should consider maintaining the I/O pins greater than or equal to VDD when the LED is off.
Figure 18 shows a high value resistor in parallel with the LED. Figure 19 shows VDD less
than the LED supply voltage by at least 1.2 V. Both of these methods maintain the I/O VI
at or above VDD and prevents additional supply current consumption when the LED is off.
This concern does not occur in the case of PCA9535C because the I/O pins are
open-drain.
VDD
3.3 V
5V
VDD
LEDn
LED
100 kΩ
VDD
LED
LEDn
002aac189
002aac190
Fig 18. High value resistor in parallel with Fig 19. Device supplied by a lower voltage
the LED
9. Limiting values
Table 13. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter
Conditions
Min
Max
Unit
VDD
VI/O
IO
II
IDD
ISS
Ptot
Tstg
Tamb
supply voltage
0.5
+6.0
V
voltage on an input/output pin
VSS 0.5 6
V
output current
on an I/O pin
-
50
mA
input current
-
20
mA
supply current
-
160
mA
ground supply current
-
200
mA
total power dissipation
-
200
mW
storage temperature
65
+150
C
ambient temperature
operating
40
+85
C
PCA9535_PCA9535C
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 6 — 7 November 2017
© NXP Semiconductors N.V. 2017. All rights reserved.
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