LP5860 datasheet(20/56 Pages) TI

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Comparing with Mode 1, Mode 2 and Mode 3 provide a better synchronization when multiple LP5860T devices

used together. A high-level pulse width longer than tSYNC_H is required at the beginning of each VSYNC frame.

Figure 8-9 shows the VSYNC connections and Figure 8-10 shows the timing requirements.

MCU

LP586x

GPIO

SYNC

Figure 8-9. Multiple Devices Sync

fVSYNC

t>tVSYNC_H

Figure 8-10. VSYNC Timing

Table 8-4 is the summary of the 3 data refresh modes.

Table 8-4. Data Refresh Mode

MODE TYPE

PWM RESOLUTION

PWM OUTPUT

EXTERNAL VSYNC

Mode 1

8 Bits

Data update instantly

Mode 2

8 Bits

Data update by frame

Yes

Mode 3

16 Bits

8.3.6 Full Addressable SRAM

SRAM is implemented inside the LP5860T device to support data writing and reading at the same time.

Although data refresh mechanisms are not the same for Mode 1 and Mode 2/3, the data writing and

reading follow the same method. Uses can update partial of the SRAM data only or the whole SRAM page

simultaneously. The LP5860T supports auto-increment function to minimize data traffic and increase data

transfer efficiency.

Please be noted that 16-bit PWM (Mode 3) and 8-bit PWM (Mode 1 and Mode 2) are assigned with different

SRAM addresses.

8.3.7 Protections and Diagnostics

LED Open Detection

The LP5860T includes LED open detection (LOD) for the fault caused by any opened LED dot. The threshold

for LED open is 0.25-V typical. LED open detection is only performed when PWM ≥ 25 (Mode 1 and Mode

2) or PWM ≥ 6400 (Mode 3) and voltage on CSn is detected lower than open threshold for continuously 4

sub-periods.

Figure 8-11 shows the detection circuit of LOD function. When open fault is detected, 'Global_LOD' bit in

Fault_state register is set to 1 and detailed fault state for each LED is also monitored in register Dot_lodx (x =

0, 1, … , 32). All open fault indicator bits can be cleared by setting LOD_clear = 0Fh after the open condition is

removed.

LOD removal function can be enabled by setting 'LOD_removal' bit in Dev_config2 register to 1. This function

turns off the current sink of the open channel when scanning to the line where the opened LED is included.

LP5860T

SNVSCE1 – MAY 2023

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