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MIC2874YCS Datasheet(PDF) 14 Page - Micrel Semiconductor |
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MIC2874YCS Datasheet(HTML) 14 Page - Micrel Semiconductor |
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14 / 22 page  Micrel, Inc. MIC2874 MIC2874 Registers The MIC2874 supports five writeable registers for controlling the torch and the flash modes of operation as shown in Table 2. Note that register addressing starts at 1. Writing any value above the maximum value shown for each registers will cause an invalid data error and the frame will be discarded. Table 2. Five Writable Registers of MIC2874 Address Name Max. Value Description 1 FEN/FCUR 31 Flash Enable/Current 2 TEN/TCUR 31 Torch Enable/Current 3 STDUR 7 Safety Timer Duration 4 LB_TH 9 Low Battery Voltage Detection Threshold 5 ST_TH 5 Safety Timer Threshold Flash Current Register (FEN/FCUR: default 4) The flash current register enables and sets the flash mode current level. Valid values are 0 to 31; values 0-15 will set the flash current without enabling the flash (such that it can be triggered externally), values 16-31 will set the flash current and enable the flash. The flash current register maps into the internal FEN and FCUR registers as shown in the table below. Table 3 describes the relationship between the flash current and the FCUR register setting. Table 3. Flash Current Register Mapping into Internal FEN and FCUR Registers, and Relationship between Flash Current and the FCUR Register Setting FEN/FCUR[4:0] Value IFLASH (A) Dec. Binary FEN[4] FCUR[3:0] 0 00000 0 0000 1.200 1 00001 0 0001 1.150 2 00010 0 0010 1.100 3 00011 0 0011 1.050 4 00100 0 0100 1.000 5 00101 0 0101 0.950 6 00110 0 0110 0.900 7 00111 0 0111 0.850 8 01000 0 1000 0.800 9 01001 0 1001 0.750 10 01010 0 1010 0.700 11 01011 0 1011 0.650 12 01100 0 1100 0.600 13 01101 0 1101 0.550 14 01110 0 1110 0.400 FEN/FCUR[4:0] Value IFLASH (A) Dec. Binary FEN[4] FCUR[3:0] 15 01111 0 1111 0.250 16 10000 1 0000 1.200 17 10001 1 0001 1.150 18 10010 1 0010 1.100 19 10011 1 0011 1.050 20 10100 1 0100 1.000 21 10101 1 0101 0.950 22 10110 1 0110 0.900 23 10111 1 0111 0.850 24 11000 1 1000 0.800 25 11001 1 1001 0.750 26 11010 1 1010 0.700 27 11011 1 1011 0.650 28 11100 1 1100 0.600 29 11101 1 1101 0.550 30 11110 1 1110 0.400 31 11111 1 1111 0.250 Torch Current Register (TEN/TCUR: default 4) The torch current register enables and sets the torch mode current level. Valid values are 0 to 31; values 0 − 15 will set the torch current without enabling the torch (such that it can be triggered by setting the internal TEN register value to 1), values 16 − 31 will set the torch current and enable the torch. A value of 0 at the internal TEN register will disable the torch. The torch current register maps into the internal TEN and TCUR registers as shown in Table 4. The table also describes the relationship between the torch current and the TCUR register setting. August 26, 2014 14 Revision 1.0 |
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