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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LED2472GQTR датащи(PDF) 24 Page - STMicroelectronics |
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LED2472GQTR датащи(HTML) 24 Page - STMicroelectronics |
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24 / 39 page  Digital blocks LED2472G 24/39 DocID024620 Rev 3 Figure 13. Different color sequence in data loading 8.9 Gain register The LED current can be programmed using an external resistor connected to GND from R- EXT pin and can be adjusted using the dedicated bits of the gain register (G-0 to G-17 defines the gain and CFG-0/1/2 the current range within the gain can be adjusted). The device can regulate the current up to 72 mA and down to 4 mA. To change anything in the gain register, a 24-bit digital word must be sent (CFG-0 represents the LSB, CFG-23 the MSB). The accuracy of the LED current depends on the selected range and it is assured only in the ranges indicated in the static electrical characteristics (see Table 5). Table 11. Gain register BIT Definition Attribute read/write Register function description Default G-0 RED current gain adjustment R/W 6-bit DAC allows adjustment of the device output current in 64 steps for each range (defined by CFG-0). default: gain = 1 1 G-1 1 G-2 1 G-3 1 G-4 1 G-5 1 G-6 GREEN current gain adjustment R/W 6-bit DAC allows adjustment of the device output current in 64 steps for each range (defined by CFG-1). default: gain = 1 1 G-7 1 G-8 1 G-9 1 G-10 1 G-11 1 |
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