LP5860 datasheet(19/56 Pages) TI

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PWM_Individual (8-bits)

8-bits

PWM_Final (8-bits)

PWM Generator

PWM_Individual (16-bits)

16-bits

PWM_Final (16-bits)

Figure 8-6. PWM Control Scheme

8.3.4 ON and OFF Control

The LP5860T device supports the individual ON and OFF control of each LED. For indication purpose, users can

turn on and off the LED directly by writing 1-bit ON and OFF data to the corresponding Dot_onoffx (x = 0, 1, … ,

32) register.

8.3.5 Data Refresh Mode

The LP5860T supports three data refresh modes: Mode 1, Mode 2, and Mode 3, by configuring

'Data_Ref_Mode' in Dev_initial register.

Mode 1: 8-bit PWM data without VSYNC command. Data is sent out for display instantly after received. With

Mode1, users can refresh the corresponding dots' data only instead of updating the whole SRAM. It is called ‘on

demand data refresh’, which can save the total data volume effectively. As shown in Figure 8-7, the red LED

dots can be refreshed after sending the corresponding data while the others kept the same with last frame.

Frame N-1

Frame N

Figure 8-7. On Demand Data Refresh - Mode 1

Mode 2: 8-bit PWM data with VSYNC command. Data is held and sent out simultaneously by frame after

receiving the VSYNC command.

Mode 3: 16-bit PWM data with VSYNC command. Data is held and sent out simultaneously by frame after

receiving the VSYNC command.

Frame control is implemented in Mode 2 and Mode 3. Instead of refreshing the output instantly after data

is received (Mode 1), the device holds the data and refreshes the whole frame data by a fixed frame rate,

fVSYNC. Usually, 24 Hz, 50 Hz, 60 Hz, 120Hz or even higher frame rate is selected to achieve vivid animation

effects. Whole SRAM Data Refresh is shown in Figure 8-8, a new frame is updated after receiving the VSYNC

command.

Frame N-1

Frame N

Figure 8-8. Whole SRAM Data Refresh

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LP5860T

SNVSCE1 – MAY 2023

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LP5860 Datasheet(PDF) 19 Page - Texas Instruments