參數(shù)資料
型號: ST72C171
廠商: 意法半導(dǎo)體
英文描述: 8-BIT MCU with 8K FLASH, ADC, WDG, SPI, SCI, TIMERS SPGAs Software Programmable Gain Amplifiers, OP-AMP
中文描述: 8位8K閃存,ADC的,水分散粒劑,SPI和脊髓損傷,定時(shí)器SPGAs軟件可編程增益放大器,運(yùn)算放大器控制器
文件頁數(shù): 128/152頁
文件大小: 1384K
代理商: ST72C171
ST72C171
128/152
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 V
DD
are not implemented. An additional
local protection between the pad and V
SS
(5a &
5b) is implemented to completly absorb the posi-
tive ESD discharge.
Multisupply Configuration
When several types of ground (V
SS
, V
SSA
, ...) and
power supply (V
DD
, V
DDA
, ...) are available for any
reason (better noise immunity...), the structure
shown in
Figure 80
is implemented to protect the
device against ESD.
Figure 78. Positive Stress on a True Open Drain Pad vs. V
SS
Figure 79. Negative Stress on a True Open Drain Pad vs. V
DD
Figure 80. Multisupply Configuration
IN
V
DD
V
SS
(1)
(2b)
(4)
OUT
V
DD
V
SS
(3b)
Main path
Path to avoid
(5a)
(5b)
IN
V
DD
V
SS
(1)
(2b)
(4)
OUT
V
DD
V
SS
(3b)
Main path
(3b)
(3b)
V
DDA
V
SSA
V
DDA
V
DD
V
SS
BACK TO BACK DIODE
BETWEEN GROUNDS
V
SSA
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