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ADPD103 数据表(PDF) 39 Page - Analog Devices |
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ADPD103 数据表(HTML) 39 Page - Analog Devices |
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39 / 53 page ![]() ADPD103 Data Sheet Rev. B | Page 38 of 52 LED CONTROL REGISTERS Table 20. LED Control Registers Address Data Bit Default Value Access Name Description 0x14 [15:12] 0x0 R/W Reserved Write 0x0 to these bits for proper operation. [11:8] 0x5 R/W SLOTB_PD_SEL PDx connection selection for Time Slot B. See Figure 13. 0x1: All photodiode inputs are connected during Time Slot B. 0x4: PD5/PD6/PD7/PD8 are connected during Time Slot B. 0x5: PD1/PD2/PD3/PD4 are connected during Time Slot B. Other: reserved. [7:4] 0x4 R/W SLOTA_PD_SEL PDx connection selection for Time Slot A. See Figure 13. 0x1: All photodiode inputs are connected during Time Slot A. 0x4: PD5/PD6/PD7/PD8 are connected during Time Slot A. 0x5: PD1/PD2/PD3/PD4 are connected during Time Slot A. Other: reserved. [3:2] 0x0 R/W SLOTB_LED_SEL Time Slot B LED configuration. These bits determine which LED is associated with Time Slot B. 0x0: reserved. 0x1: LEDX1 pulses during Time Slot B. 0x2: LEDX2 pulses during Time Slot B. 0x3: LEDX3 pulses during Time Slot B. [1:0] 0x1 R/W SLOTA_LED_SEL Time Slot A LED configuration. These bits determine which LED is associated with Time Slot A. 0x0: reserved. 0x1: LEDX1 pulses during Time Slot A. 0x2: LEDX2 pulses during Time Slot A. 0x3: LEDX3 pulses during Time Slot A. 0x22 [15:14] 0x0 R/W Reserved Write 0x0. 13 0x1 R/W ILED3_SCALE LEDX3 current scale factor. 1: 100% strength. 0: 40% strength; sets the LEDX3 driver in low power mode. LEDX3 Current Scale = 0.4 + 0.6 × (Register 0x22, Bit 13). 12 0x1 R/W Reserved Write 0x1. [11:7] 0x0 R/W Reserved Write 0x0. [6:4] 0x0 R/W ILED3_SLEW LEDX3 driver slew rate control. The slower the slew rate, the safer the performance in terms of reducing the risk of overvoltage of the LED driver. 0: the slowest slew rate. … 7: the fastest slew rate. [3:0] 0x0 R/W ILED3_COARSE LEDX3 coarse current setting. Coarse current sink target value of LEDX3 in standard operation. 0: 25 mA. 1: 40 mA. 2: 55 mA. … 15: 250 mA. LED3PEAK = LED3COARSE × LED3FINE × LED3SCALE where: LED3PEAK is the LEDX3 peak target value (mA). LED3COARSE = 28 + 15.46 × (Register 0x22, Bits[3:0]). LED3FINE = 0.71 + 0.024 × (Register 0x25, Bits[15:11]). LED3SCALE = 0.4 + 0.6 × (Register 0x22, Bit 13). |
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