PCA9698BS,118

PCA9698

All information provided in this document is subject to legal disclaimers.

© NXP B.V. 2010. All rights reserved.

Product data sheet

Rev. 3 — 3 August 2010 

20 of 48

NXP Semiconductors

PCA9698

40-bit Fm+ I

2

C-bus advanced I/O port with RESET, OE and INT

7.12 Output enable input (OE)

The configurable active LOW or active HIGH output enable pin allows to enable or disable 
all the I/Os at the same time.

When a LOW level is applied to the OE pin, with OEPOL = 0 (register 2Ah, bit 4) or a 
HIGH level is applied to the OE pin, with OEPOL = 1 (register 2Ah, bit 0), all the I/Os 
configured as outputs are enabled and the logic value programmed in their respective 
OP registers is applied to the pins.

When a HIGH level is applied to the OE pin, with OEPOL = 0 (register 2Ah, bit 0) or a 
LOW level is applied to the OE pin, with OEPOL = 1 (register 2Ah, bit 0), all the I/Os 
configured as outputs are 3-stated.

For applications requiring LED blinking with brightness control, this pin can be used to 
control the brightness by applying a high frequency PWM signal on the OE pin. LEDs can 
be blinked using the Output Port registers and can be dimmed using the PWM signal on 
the OE pin thus controlling the brightness by adjusting the duty cycle.

Default is OEPOL = 0, so if the OE pin is held HIGH, the outputs are disabled. The OE pin 
needs to be pulled LOW or OEPOL changed to ‘1’ to enable the outputs.

It is recommended to define the required polarity of the OE input by programing the value 
of OEPOL before programming the configuration registers (IOC register).

7.13 Live insertion

The PCA9698 is fully specified for live-insertion applications using I

OFF

, power-up 

3-states, robust state machine, and 50 ns noise filter. The I

OFF

 circuitry disables the 

outputs, preventing damaging current backflow through the device when it is powered 
down. The power-up 3-states circuitry places the outputs in the high-impedance state 
during power-up and power-down, which prevents driver conflict and bus contention.

The robust state machine does not respond until it sees a valid START condition and the 
50 ns noise filter will filter out any insertion glitches. The PCA9698 will not cause 
corruption of active data on the bus nor will the device be damaged or cause damage to 
devices already on the bus when similar featured devices are being used.

7.14 Standby

The PCA9698 goes into standby when the I

2

C-bus is idle. Standby supply current is lower 

than 1.0

μA (typical).

PCA9698BS,118 Information:
Part No.
PCA9698BS,118

RFQ

Description
IC I/O EXPANDER I2C 40B 56HVQFN
File Size
370946 bytes
Page Size
595.22 x 842 pts (A4)
All Pages
48
Manufacturer
NXP Semiconductors
Homepage
http://www.nxp.com/
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