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| ST72104GX-AUTO Datasheet, PDF (115/135 Pages) STMicroelectronics – 8-bit MCU for automotive with single voltage Flash/ROM memory, ADC, 16-bit timers, SPI, I2C interfaces | |||
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ST72104Gx-Auto, ST72215Gx-Auto, ST72216Gx-Auto, ST72254Gx-Auto
EMC CHARACTERISTICS (Contâd)
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, VDDA, ...) are available for any
reason (better noise immunity...), the structure
shown in Figure 76 is implemented to protect the
device against ESD.
Figure 74. Positive Stress on a True Open Drain Pad vs. VSS
VDD
VDD
Main path
Path to avoid
(1)
OUT
(4)
IN
(5a)
(3b)
(2b)
(5b)
VSS
Figure 75. Negative Stress on a True Open Drain Pad vs. VDD
VDD
Main path
OUT
(4)
IN
(3b)
(3b)
VSS
Figure 76. Multisupply Configuration
VDD
VSS
VDD
(1)
(2b)
(3b)
VSS
VDDA
VDDA
VSS
VSSA
BACK TO BACK DIODE
BETWEEN GROUNDS
VSSA
115/135
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