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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LP55281TL/NOPB датащи(PDF) 16 Page - Texas Instruments |
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LP55281TL/NOPB датащи(HTML) 16 Page - Texas Instruments |
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16 / 42 page  16 LP55281 SNVS458D – JUNE 2007 – REVISED OCTOBER 2016 www.ti.com Product Folder Links: LP55281 Submit Documentation Feedback Copyright © 2007–2016, Texas Instruments Incorporated Table 1. LED Current Level Adjust Rx_IPLS[7:6], Gx_IPLS[7:6], Bx_IPLS[7:6] SINK CURRENT PULSE (IMAX = 100 × 1.23 / RRGB) – IPLS 00 0.25 × IMAX 01 0.50 × IMAX 10 0.75 × IMAX 11 1.00 × IMAX Table 2. LED PWM Control Rx_PWM[5:0], Gx_PWM[5:0], Bx_PWM[5:0] AVERAGE SINK CURRENT PULSE RATIO (%) 000 000 0 0 000 001 1/63 × IPLS 1.6 000 010 2/63 × IPLS 3.2 ... ... ... 111 110 62/63 × IPLS 98.4 111 111 63/63 × IPLS 100 Each RGB set must be enabled separately by setting EN_RGBx bit to 1. The device must be enabled (NSTBY = 1) before the RGB outputs can be activated. When any of EN_RGBx bits are set to 1 and NSTBY = 1, the RGB driver takes a certain quiescent current from battery even if all PWM control bits are 0. The quiescent current is dependent on RRGB resistor, and can be calculated from formula IR_RGB = 1.23 V / RRGB. 7.3.2.1 PWM Control Timing PWM frequency can be selected from 3 predefined values: 10 kHz, 20 kHz, and 40 kHz. The frequency is selected with FPWM1 and FPWM0 bits, see Table 3. Table 3. PWM Frequency FPWM1 FPWM0 PWM FREQUENCY (fPWM) 0 0 9.92 kHz 0 1 19.84 kHz 1 0 39.68 kHz 1 1 39.68 kHz |
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