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2.6.3 Register Map Page
Figure 2-8
shows the registers map page. All the registers are available on this page. When Auto Read is set to
other than "Off", all the registers will be read automatically and periodically according to the interval time the user
selects. Otherwise, the user needs to click the READ REGISTER button to read the selected register or click the
READ ALL REGISTERS button to read all of the registers.
Clicking on the row of a register automatically updates the corresponding field view on the right side of the page.
The register value can be updated by modifying the hexadecimal value in the Value column or by double-clicking
the corresponding bit in the Bits column. The modified value is effective immediately if "Immediate Write" is
selected in the drop-down menu. When "Deferred Write" is selected, the modified value will not take effect until
the user clicks the WRITE REGISTER button. The value of all the registers can be updated together by clicking
the WRITE ALL REGISTERS button.
2.7 Instructions for Standalone Evaluation
The LP8864EVM can be used for standalone evaluation (without GUI software and PC connection). To support
standalone mode, it must be modified from its default settings as described in the following list:
1. Mount R20 to pull up EN input.
2. Change pullup and pulldown resistors to select spread spectrum enable (R18) or disable (R25) option.
3. Mount R19 to pull up PWM input for 100% brightness. If brightness needs to be changed from 100%, connect
external PWM source at PWM pin.
The minimum procedures for turning on the LEDs after the previously-listed modifications are as follows:
1. Connect a 12-V external power supply between the power input terminals VBAT+ and GNDin on the
LP8864EVM.
2. Connect the LP886X-LEDLAOD-EVM board (4 strings, 8 LEDs per string) to J10 on the LP8864EVM.
3. Turn on the external power supply.
SNVU731 – NOVEMBER 2020
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Figure 2-8. LP8864EVM Register Map Page
Copyright © 2020 Texas Instruments Incorporated
Test Setup
LP8864 Evaluation Module
9
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