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PCA9698

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

Product data sheet

Rev. 3 — 3 August 2010

20 of 48

NXP Semiconductors

PCA9698

40-bit Fm+ I2C-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 IOFF, power-up

3-states, robust state machine, and 50 ns noise filter. The IOFF 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 I2C-bus is idle. Standby supply current is lower

than 1.0

μA (typical).

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