SLDU040 November   2022 LP5891

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Features
    2. 1.2 Applications
  4. 2Function Descriptions
  5. 3Test Setup
    1. 3.1 System/Tool Requirements
    2. 3.2 Software Setup
    3. 3.3 Hardware Setup for Single Device
    4. 3.4 Hardware Setup for Dual Cascaded Devices
  6. 4Additional Resources
  7. 5Schematic
  8. 6Layout
  9. 7Bill of Materials

2 Function Descriptions

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

Figure 2-1 shows the image of the driver IC side of the LP5891EVM board.

Figure 2-2 shows the image of the LED side of the LP5891EVM board.

GUID-20220908-SS0I-T1JT-BHVD-Z0PGF5ZXF5BW-low.jpgFigure 2-1 Driver IC Side of the LP5891EVM Board
GUID-20221129-SS0I-KKHN-1PRX-WFCDXQPNC3QW-low.jpg Figure 2-2 LED Side of the LP5891EVM Board

The LP5891EVM works with a host controller, the MSP430F5529 LaunchPad™. 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.

Table 2-1 lists the connectors of LP5891EVM board and their descriptions.

Table 2-2 lists the jumpers of LP5891EVM board and their descriptions.

Table 2-3 lists the switches of LP5891EVM board and their descriptions.

Table 2-1 Connectors
NameDescription
J1, J2Boosterpack connectors for connecting with the MSP430F5529 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", the serial data output from LP5891 chip is sent back to the host controller.
  • If the switch is set towards "SOUT1TO2", 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", the red LED in row 0, column 0 is connected in normal state.
  • If the switch is set towards "R00S", 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", the green LED in row 1, column 0 is connected in normal state.
  • If the switch is set towards "G10S", 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", the red LED in row 2, column 1 is connected in normal state.
  • If the switch is set towards "R21O", 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", the green LED in row 3, column 1 is connected in normal state.
  • If the switch is set towards "G31O", the green LED in row 3, column 1 is opened (the anode of the LED is disconnected from the current source channel).