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IC-DX Datasheet(PDF) 8 Page - IC-Haus GmbH |
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IC-DX Datasheet(HTML) 8 Page - IC-Haus GmbH |
8 / 9 page iC-DX UNIVERSAL DIGITAL SENSOR OUTPUT DRIVER Rev C1, Page 8/9 CIRCUIT PROTECTION The iC-DX is reverse polarity protected via internal circutry. As far as the maximum voltage ratings are not exceeded, no possible supply combination at the line side pins (VB, GND and OUT) can damage the chip. Since the chip current consumption is relatively low, discharging of the backup capacitor C1 can be very slow, and injected charge through disturbances may in general result in capacitor voltage exceeding maxi- mum ratings, leading to malfunction or destruction of circuitry and associated parts. Thus EMC require- ments will afford more external circuitry. Figure 9 shows the iC-DX with the additional protective device D1, D2 and D3. For over-voltage protection, the suppressor diodes D1,D2 and D3 absorbs transients on supply line in- jected externally on the cable. Clamp voltage of the diodes should be rated slightly above maximum speci- fied supply voltage. These currents can be passed to ground or to VB by the internal ESD diodes of the iC-DX. Whereas negative current injection will simply be drained off to ground, positive current injection will charge capacitor C1 further to higher voltages. If not suppressor diodes nor any other over-voltage protection is implemented, the backup capacitor C1 should be kept small. A typi- cal 100nF value is normally OK. Suggested protective devices At VBmax of 36V, suppressor diodes with a breakdown voltage from 36V has to be chosen in order to minimize the energie in iC-DX for higer Voltages. For example Diode type like Vishay GSOT36C or PJSD36W from Pan Jit should be enough as protection. Figure 9: Circuit schematic showing protective de- vices REVISION HISTORY Rel Rel.Date Chapter Modification Page A3 28.04.11 preliminary release Rel Rel.Date Chapter Modification Page B1 19.06.13 ABSOLUTE MAXIMUM RATINGS Parameter G004 introduced 4 Rel Rel.Date Chapter Modification Page C1 03.12.14 preliminary label on front page removed 1 THERMAL DATA parameter T02 value Rthja introduced 4 iC-Haus expressly reserves the right to change its products and/or specifications. An info letter gives details as to any amendments and additions made to the relevant current specifications on our internet website www.ichaus.com/infoletter; this letter is generated automatically and shall be sent to registered users by email. Copying – even as an excerpt – is only permitted with iC-Haus’ approval in writing and precise reference to source. iC-Haus does not warrant the accuracy, completeness or timeliness of the specification and does not assume liability for any errors or omissions in these materials. The data specified is intended solely for the purpose of product description. No representations or warranties, either express or implied, of merchantability, fitness for a particular purpose or of any other nature are made hereunder with respect to information/specification or the products to which information refers and no guarantee with respect to compliance to the intended use is given. In particular, this also applies to the stated possible applications or areas of applications of the product. iC-Haus products are not designed for and must not be used in connection with any applications where the failure of such products would reasonably be expected to result in significant personal injury or death (Safety-Critical Applications) without iC-Haus’ specific written consent. Safety-Critical Applications include, without limitation, life support devices and systems. iC-Haus products are not designed nor intended for use in military or aerospace applications or environments or in automotive applications unless specifically designated for such use by iC-Haus. iC-Haus conveys no patent, copyright, mask work right or other trade mark right to this product. iC-Haus assumes no liability for any patent and/or other trade mark rights of a third party resulting from processing or handling of the product and/or any other use of the product. |
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