SLLU386 August   2024 TIOL221

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Power Requirements
    2. 2.2 Current Limit Configuration
    3. 2.3 Setup
    4. 2.4 Header Information
    5. 2.5 Jumper Information
    6. 2.6 IO-Link Interface
    7. 2.7 Test Points
    8. 2.8 I2C EEPROM
  8. 3Software
  9. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layouts
    3. 4.3 Bill of Materials (BOM)
  10. 5Additional Information
    1. 5.1 Trademarks

2.2 Current Limit Configuration

The output current limit for the CQ and DO pins can be configured independently.

In pin-mode, the current limit of CQ and DO can be configured through a resistance (RSET) on the ILIM_ADJ1 and ILIM_ADJ2 pins. The highest current limit setting with an external resistor of 10kΩ provides a minimum of 300mA over the operating temperature and voltage range.

Output disable, due to current fault and current fault auto recovery features, can be disabled by floating ILIM_ADJ1/2 pins. However, the current fault indication is still active in this configuration and this feature is useful when driving large capacitances.

When ILIM_ADJ1/2 pins are shorted to GND, the CQ and DO drivers can be configured to be in the IO-Link controller mode. In this mode, the drivers can source or sink a minimum of 500mA to generate a wake-up request. In addition, this enables a small current sink of 5mA (minimum) at the driver output pins. The current fault indication, output disable, and auto recovery features are disabled in this mode.

Table 2-3 Current Limit Configuration in Pin-mode
ILIM_ADJ1/2 Pin Condition CQ/DO Current Limit

(Min.)

 NFLT1/2 Indication Due to Current

Fault

Current Fault Blanking Time (tSC)

 Output Disable and Auto Recovery
RSET resistor to L-

(10kΩ to 110kΩ)

 Variable

(35mA to 300mA)

 Yes

200µs (typ)

 Yes
Connected to L-

(RSET 0 to 5kΩ)

 500mA No

N/A

 No
OPEN 260mA Yes

None (immediate fault indication)

 No

In the SPI mode, CQ and DO driver current limits can be configured via SPI. The CQ driver current limit can be configured via the CQ_CURLIM[7:5] register. Similarly, the DO driver current limit can be configured via the DO_CURLIM[7:5] register.