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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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IC-HTP датащи(PDF) 29 Page - IC-Haus GmbH |
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IC-HTP датащи(HTML) 29 Page - IC-Haus GmbH |
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29 / 51 page  prel imin ary prel imin ary iC-HTP DUAL CW P-TYPE LASER DIODE DRIVER Rev B1, Page 29/51 x2 Signal Level Converter 255 RM1 D A 0 10 Bit 10 Bit ADMDK1 LASER CHANNEL 1 8 Bit D ..10 nF.. A D A APC 8 Bit R x1 I LDA1 P + - CI1 CI1 CI ECIE1 DCO LDA1 CIH1 ADFNS1 LDA1 VBL1 VB VB VDD EMC DISP1 MDK1 MRH1 VBL1 CI1 P I LDA1 Figure 16: PLR in APC In ACC mode the PLR is not used in the control cir- cuit. Instead, the internal RACCx resistor is used in the control loop. Even though the PLR is not in the control circuit, it can be enabled (DISPx = 0) in order to give feedback through the 10 bit A/D converter for the controlling light power if a monitor diode is connected. Register bit ADFNSx is set to 0 to measure the internal sense node. Alternatively, an external monitor resistor can be used to measure the optical power, by setting DISPx to 1. Then register bit ADFNSx must be set to 1 in order to measure directly at pin MDKx. Signal Level Converter 255 0 D A 10 Bit 10 Bit ACC ADMDK1 LASER CHANNEL 1 8 Bit D ..10 nF.. A D A APC 8 Bit R x1 x2 + - I LDA1 P CI1 CI1 CI ECIE1 DCO LDA1 OVC CIH1 VBL1 ADFNS1 LDA1 VBL1 VB VB VDD EMC DISP1 MDK1 MRH1 I LDA1 CI1 P Figure 17: ACC with monitor photodiode 10 BIT LOGARITHMIC D/A CONVERTER The 10 bit logarithmic D/A converter is used for setting the regulator´s voltage reference. The D/A converter is active in all operating modes. In iC-WK mode only two values are available: 0.25 V (setting INS/WKR pin lo) and 0.5 V (setting INS/WKR pin hi). In MCU mode both APC and ACC use the D/A converter. With a range from 0.1 V to 1.1 V and the typical step width is 0.235%. The D/A converter is configured through register REFx(9:0). With REFx(9:0) = 0x000, D/A output value is set to 0.1 V, and for REFx(9:0) = 0x3FF, D/A output is configured to 1.1 V. REF1 Addr. 0x13/14; bit 9:0 R/W 0x000 0x000 Channel 1 regulator reference voltage set to minimum voltage . . . Channel 1 regulator reference voltage set to Vref = Vref0(1 + ∆ Vref (%) 100 )n+1, n from 0 to 1023 0x3FF Channel 1 regulator reference voltage set to maximum voltage Table 61: Regulator voltage reference channel 1 REF2 Addr. 0x18/19; bit 9:0 R/W 0x000 0x000 Channel 2 regulator reference voltage set to minimum voltage . . . Channel 2 regulator reference voltage set to Vref = Vref0(1 + ∆ Vref (%) 100 )n+1, n from 0 to 1023 0x3FF Channel 2 regulator reference voltage set to maximum voltage Table 62: Regulator voltage reference channel 2 To calculate the D/A converter value for each REFx value, use the following expression: Vref = Vref0(1 + ∆ Vref (%) 100 )n+1, n from 0 to 1023 Where Vref0 is the minimum value (typically 0.1 V), ∆ Vref (%) is the step value (typically 0.235 %) and n is the value of REFx register in decimal. |
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