CCE4503 Datasheet

R15DS0024ED0204 Rev.2.5

Jan 25, 2023

Page 10

4.1

Output Stage

The output stage switches the output transistors in regard to TXD and TXEN. In IO-Link mode or Push-Pull

mode TXEN is used to enable or disable the output stage. If TXEN is set high, the output stage is enabled and

the output of CQ can be controlled by TXD (inverted). If TXEN is set low, the output stage is disabled and put

into an inactive low-power state.

TXEN and TXD can also be used to configure the device in NPN, PNP and Push-Pull mode. See Table 1. NPN

mode can be configured by setting TXD high and using TXEN as control pin. PNP mode can be configured by

setting TXD low and using TXEN as control pin.

Table 1. Output stage truth table

Mode

TXEN

TXD

CQ

IO-Link

(regular operation)

/ Push-Pull

0

0

High-Z

0

1

High-Z

1

0

1

1

1

0

NPN

0

1

High-Z

1

1

0

PNP

0

0

High-Z

1

0

1

4.2

Current limit and slew rate configuration

The driver slew rate as well as the current limit is configured by a resistor RILIM connected to ILIM. The value of

the resistor intended for configuration is specified between 0

Ω and 100 kΩ, where a lower resistor value leads to

faster switching and higher maximum currents. The automatic recovery function is only available for RILIM < 1

M

Ω.

Table 2: Current limit and slew rate configuration

Resistor

Current limit

Slew rate

Automatic recovery

0

Ω - 100 kΩ

350 mA - 50 mA

Fast - slow

Yes

Open (RILIM > 4 M

Ω)

350 mA

Fast

No

Note: If ILIM is left open (RILIM > 4 MΩ) the output driver operates as if connected to VSS (RILIM = 0 Ω), but with

automatic recovery disabled.