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ST72521 データシート(PDF) 182 Page - STMicroelectronics |
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ST72521 データシート(HTML) 182 Page - STMicroelectronics |
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182 / 211 page  ST72521 182/211 EMC CHARACTERISTICS (Cont’d) True Open Drain Pin Protection The centralized protection (4) is not involved in the discharge of the ESD stresses applied to true open drain pads due to the fact that a P-Buffer and diode to VDD are not implemented. An additional local protection between the pad and VSS (5a & 5b) is implemented to completely absorb the posi- tive ESD discharge. Multisupply Configuration When several types of ground (VSS, VSSA, ...) and power supply (VDD, VAREF, ...) are available for any reason (better noise immunity...), the structure shown in Figure 99 is implemented to protect the device against ESD. Figure 97. Positive Stress on a True Open Drain Pad vs. VSS Figure 98. Negative Stress on a True Open Drain Pad vs. VDD Figure 99. Multisupply Configuration IN VDD VSS (1) (2b) (4) OUT VDD VSS (3b) Main path Path to avoid (5a) (5b) IN VDD VSS (1) (2b) (4) OUT VDD VSS (3b) Main path (3b) (3b) VAREF VSSA VAREF VDD VSS BACK TO BACK DIODE BETWEEN GROUNDS VSSA |
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