SLDU040A November   2022  – August 2024 LP5891

 

  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 Function Descriptions
    2. 2.2 Test Setup
      1. 2.2.1 System/Tool Requirements
      2. 2.2.2 Hardware Setup for Single Device
      3. 2.2.3 Hardware Setup for Dual Cascaded Devices
  8. 3Software
    1. 3.1 Software Setup
  9. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layout
    3. 4.3 Bill of Materials
  10. 5Additional Information
    1. 5.1 Additional Resources
    2. 5.2 Trademarks
  11. 6Revision History

2.1 Function Descriptions

This section describes the connectors, jumpers and switches on LP5891EVM board.

The driver IC side of the LP5891EVM board is shown in Figure 2-1.

The LED side of the LP5891EVM board is shown in Figure 2-2.

LP5891EVM Driver IC Side of the LP5891EVM BoardFigure 2-1 Driver IC Side of the LP5891EVM Board
LP5891EVM LED Side of the LP5891EVM Board Figure 2-2 LED Side of the LP5891EVM Board

The LP5891EVM works with a host controller, the TMS320F280039C LaunchPad™ for C2000™ real-time MCU. The LP5891EVM is designed with connectors, jumpers and switches to support device-to-device connection, device-to-host connection and flexible power supply scheme. In addition, there are four switches on the LED side of the LP5891EVM board that enables the evaluation of LED open and short detection and removal functions of the LP5891.

The connectors of LP5891EVM board and the descriptions are listed in Table 2-1.

The jumpers of LP5891EVM board and the descriptions are listed in Table 2-2.

The switches of LP5891EVM board and the descriptions are listed in Table 2-3.

Table 2-1 Connectors
NameDescription
J1, J2Boosterpack connectors for connecting with the TMS320F280039C LaunchPad.

J3

Input board-to-board connectors between LP5891EVM boards, including +5V, SIN (serial data input), SCLK (serial clock) and GND.

J4

Output board-to-board connectors between LP5891EVM boards, including +5V, SOUT (serial data output), SCLK (serial clock) and GND.

TP1 (+5 V)

External power supply that can be selected for VLEDG/VLEDB and DC/DC.
TP2 (GND)Supply ground.
Table 2-2 Jumpers
Name Description

J3

 J3 is used to select external +5V power supply.
  • Put the jumper on TP1 5V and EX 5V to select the external power supply from TP1.
  • Put the jumper on J3 5V and EX 5V to select the external power supply from J3.

J6

 J3 is used to select the +5V power supply that supplies VLEDG/VLEDB and DC/DC.
  • Put the jumper on MCU5V and the middle to select the +5V power supply from the host controller.
  • Put the jumper on EX5V and the middle to select the external +5V power supply, which is previously selected by J3.

J7

 J7 is used to select the power supply that supplies VLEDR.
  • Put the jumper on 5V VR and the middle to select +5V power supply for VLEDR. The +5V power supply is previously selected by J6.
  • Put the jumper on 3V3 VR and the middle to select +3.3V power supply for VLEDR. The +3.3V power supply is generated by DC/DC.
Table 2-3 Switches
NameDescription

S1

  • If the switch is set towards SOUTHOST, then the serial data output from LP5891 chip is sent back to the host controller.
  • If the switch is set towards SOUT1TO2, then the serial data output from the first LP5891 chip is sent to J4 port, which is further sent to the second chip if several LP5891EVM are cascaded.

S2

  • If the switch is set towards R00C, then the red LED in row 0, column 0 is connected in normal state.
  • If the switch is set towards R00S, then the red LED in row 0, column 0 is shorted (the anode and the cathode of the LED are shorted).

S3

  • If the switch is set towards G10C, then the green LED in row 1, column 0 is connected in normal state.
  • If the switch is set towards G10S, then the green LED in row 1, column 0 is shorted (the anode and the cathode of the LED are shorted).

S4

  • If the switch is set towards R21C, then the red LED in row 2, column 1 is connected in normal state.
  • If the switch is set towards R21O, then the red LED in row 2, column 1 is opened (the anode of the LED is disconnected from the current source channel).

S5

  • If the switch is set towards G31C, then the green LED in row 3, column 1 is connected in normal state.
  • If the switch is set towards G31O, then the green LED in row 3, column 1 is opened (the anode of the LED is disconnected from the current source channel).