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LDS8161 Datasheet(PDF) 7 Page - IXYS Corporation |
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LDS8161 Datasheet(HTML) 7 Page - IXYS Corporation |
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7 / 22 page  LDS8161/41 © 2009 IXYS Corp. 7 Doc. No. 8141/61_DS, Rev. N1.0 Characteristics subject to change without notice A0h Silicon diode dVF/dT [7:0] 8 Silicon diode VF temperature coefficient (K factor) : Factory recommended loaded value is 36h = -1.71 mV/°C = 001 10110 (bin), where bits from bit 7 to bit 5 represent integer part [1(decimal) = 001 (bin)], and bits from bit 4 to bit 0 – fractional part [0.710 / 0.03125 = 22 (decimal) = 10110 (bin)] A2h LED dVF/dT [7:0] 8 User-loaded VF temperature coefficient @ 1mA for LEDs used at Banks A, B, C respectively. Negative tracking is assumed with temperature; Bits from bit 7 to bit 5 represent integer part and bits from bit 4 to bit 0 - fractional part of the coefficient Example: Temperature coefficient = -2.26 mV/ 0C; Bit 7 – bit 6 = 2 (decimal) = 010 (bin), and Bit 4 – bit 0 = INT{0.26 / 0.03125} = 8 (decimal) = 01000 (bin) User loads 010 01000 (bin) = 48h = -2.25 (closest setting) C0h Silicon diode η[7:0] 8 Silicon diode η(eta, or non-ideality factor): Factory recommended loaded value is default is 1.00 = 01000000(bin) = 40h Bits from bit 7 to bit 5 represent integer part and bits from bit 4 to bit 0 - fractional part (resolution = 0.015625 per LSB) Example: η= 1.00; Bit 7 – bit 6 = 1 (decimal) = 01 (bin), and Bit 5 – bit 0 = INT{0.00 / 0.015625} = 0 (dec) = 000000 (bin) User loads 01 000000 = 40h = 1.00 D4h Silicon diode Rs offset [7:0] 8 Silicon diode series resistance offset Factory recommended loaded value = 04h = ~ 68 ohms Formula (decimal) = 8192 x [(68 ohms x 8 x 10 - 6 A)/1.14 V] D6h LED Rs offset [7:0] 8 LED Rs offset (user-loaded) for Banks A, B, and C LEDs Typically LED Rs = 5 – 30 Ω User loads per LED used. (1/slope of high current region of LED I-V characteristic). Formula (decimal) = 8192 x [(Rs Ωx 8 x 10 - 4 A) / 1.14V] Table 1 Channel Enable Register Register Address Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 03h (8161) LED OT Flag N/A Enable C2 Enable C1 Enable B2 Enable B1 Enable A2 Enable A1 (8141) Same N/A N/A N/A Same Same Same Same Table 2 Digital Test Modes Register Register Address Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Factory Only Factory Only Diagnostics Request Slow Ramp Bypass = 1 Fast PWM adjust =1 Factory Only Post ADC Filter Enable =1 Factory Only 19h 0* 0* 0* 0* Normal = 0* 0* Filter Off=0* 0* Note: *) Value by default |
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