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AS8846 Datasheet(PDF) 29 Page - ams AG |
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AS8846 Datasheet(HTML) 29 Page - ams AG |
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29 / 35 page  Data Sheet AS8446 Revision 1.8, Date 2005-03-17 Page 29 of 35 Examples: AV_RANGE_over = 1/4: ACMV_over = 17.5, 17.75, 18, … , 20, … , 22.25 , 22.5 AV_RANGE_over = 4/4: ACMV_over = 70, 71, 72, …, 80, … , 89, 90 The adjustment (trimming) of the measurement resistor Rmeas is realized by the same programming parameter AV_TRIMM (+ 12.5%) like in a). The maximal output voltage of the over current amplification channel VA_overc (this is the nominal input voltage of the ADC on the µP) must be 4.0 V. The threshold value of the over current detection can be programmed by the programming parameters OVERC_level (in conjunction with AV_RANGE_over and AV_TRIMM) in the following way. The voltage over the external measurement resistor where the over current situation is detected (Vmeas_over) is given by: Vmeas_over = OVERC_level / (AV_TRIMM * AV_RANGE_over) with OVERC_level = 0.5 V, 1.0 V, 1.5 V, … 4.0 V See also section Summary of all programmable registers (parameters, functions) for the programming of the parameters above. PARAMETER SYMBOL MIN MAX UNIT NOTE (Programming, nominal amplification) - 6 + 6 % Vmeas = 50 mV, R8 = 0 à 80 - 10 + 10 % Vmeas = 25 mV, R8 = 1 à 160 - 20 + 20 % Vmeas = 16.67mV, R8 = 2 à 240 Tolerance of voltage amplification, normal current measurement channel 1) ∆ACMV_normal - 20 + 20 % Vmeas = 12.5 mV, R8 = 3 à 360 - 6 + 6 % Vmeas = 200 mV, R10 = 0 à 20 - 6 + 6 % Vmeas = 100 mV, R10 = 1 à 40 - 6 + 6 % Vmeas = 60.6 mV, R10 = 2 à 60 Tolerance of voltage amplification, over current measurement channel 1) ∆ACMV_over - 6 + 6 % Vmeas = 50 mV, R10 = 3 à 80 Tolerance of linearity ACMV_normal ∆lincurrent - 3 + 3 % (( ∆VA_current / ∆Vmeas_nom ) - ACMV_normal ) / ACMV_normal Tolerance of linearity ACMV_overc ∆linoverc - 3 + 3 % (( ∆VA_overc / ∆Vmeas_nom ) - ACMV_overc ) / ACMV_overc Tolerance of over current thresholds ∆overclevel - 10 + 10 % R10 = 0, R9 ≤ 3, Tamb > 25 oC Tolerance of over current thresholds ∆overclevel - 20 + 10 % R10 = 0, R9 ≤ 3, Tamb = -40 oC Tolerance of over current thresholds ∆overclevel - 20 + 20 % R10 = 0, R9 > 3, Tamb = (-40 to 125) oC Cut off frequency fcut-off 400 800 kHz Note (1): The offset voltage of the current measurement unit at calibration temperature Vmeas_offset is < 1.5 mV (typical: 0.5 mV), the maximal offset temperature drift is + 20 µV / K. |
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