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AN4374 Datasheet(PDF) 7 Page - STMicroelectronics |
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AN4374 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 25 page DocID025366 Rev 2 7/25 AN4374 First LED power-on 25 At the end of the above sequence a 16-bit word with global latch must be sent, see Figure 6. Figure 6. Brightness register: last BRT word example • The output switch enable has to be sent. 16 bits with SDI=1 on switch register have to be sent to have all 16 outputs ON (see Table 2 and Figure 7 and Figure 8). Table 2. Digital key summary-write switch Number #CLK rising edge when the LE is 1 Command description 11-2 Write switch (to turn on/off output channels) 2 3-4 Brightness data latch 3 5-6 Brightness global latch 4 7 Write configuration register 5 8 Read configuration register 6 9 Start open error detection mode 7 10 Start short error detection mode 8 11 Start combined error detection mode 9 12 End error detection mode 10 13 Thermal error reading 11 14 Reserved 12 15 Reserved Clk SDI LE 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 first bit last bit Brightness register : BRT output 0(*) = 0xFFFF – BRT outputs 15 to 1(*)= already defined (BRT reg. output 0 = 0xFFFF) (*) We are assuming that this is the last 16- bit data word in the 16 word data stream needed to load correctly the brightness register. Global Latch Key AM16855v1 |
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