LED1642GWXTTR datasheet(16/42 Pages) STMICROELECTRONICS

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Digital blocks

LED1642GW

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DocID024395 Rev 6

Digital blocks

The data input arrives through the serial Interface at each CLK rising edge. The LE signal is

used to latch the loaded data and also to address data loading to the appropriate register,

thermal flag reading and error detection. The access to the different registers or functions of

the device (configuration register, brightness register or current gain, error detection, etc.) is

achieved by using different digital keys, defined as a number of CLK pulses during which the

LE signal is asserted. The available digital keys are listed in Table 7 and Figure 8. A typical

channel data input is shown in Figure 9.

Table 7. Digital key summary

Number # CLK rising edge when the LE is “1”

Command description

1 – 2

Write switch (to turn on/off output channels)

3 – 4

Brightness data latch

5 – 6

Brightness global latch

Write configuration register

Read configuration register

Start open error detection mode

Start short error detection mode

Start combined error detection mode

End error detection mode

Thermal error reading

Reserved

LED1642GWXTTR Datasheet(PDF) 16 Page - STMicroelectronics