ST72215G2 STMicroelectronics, ST72215G2 Datasheet - Page 116

• Manufacturer Part Number: ST72215G2
• Description: 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY,ADC, 16-BIT TIMERS, SPI, I2C INTERFACES
• Manufacturer: STMicroelectronics

Specifications of ST72215G2

• Emulation Voltage: 5.5 V

ST72104Gx, ST72215Gx, ST72216Gx, ST72254Gx
EMC CHARACTERISTICS (Cont’d)
13.7.3 ESD Pin Protection Strategy
To protect an integrated circuit against Electro-
Static Discharge the stress must be controlled to
prevent degradation or destruction of the circuit el-
ements. The stress generally affects the circuit el-
ements which are connected to the pads but can
also affect the internal devices when the supply
pads receive the stress. The elements to be pro-
tected must not receive excessive current, voltage
or heating within their structure.
An ESD network combines the different input and
output ESD protections. This network works, by al-
lowing safe discharge paths for the pins subjected
to ESD stress. Two critical ESD stress cases are
presented in
pins and in
drain pins.
Figure 73. Positive Stress on a Standard Pad vs. V
Figure 74. Negative Stress on a Standard Pad vs. V
116/141
Main path
Path to avoid
Main path
Figure 75
Figure 73
V
V
V
V
DD
DD
SS
SS
and
and
Figure 76
Figure 74
(3a)
(3b)
(3a)
(3b)
for true open
for standard
OUT
OUT
SS
Standard Pin Protection
To protect the output structure the following ele-
ments are added:
To protect the input structure the following ele-
ments are added:
DD
– A diode to V
– A protection device between V
– A resistor in series with the pad (1)
– A diode to V
– A protection device between V
(4)
(4)
IN
IN
DD
DD
(3a) and a diode from V
(2a) and a diode from V
(2a)
(2b)
(2a)
(2b)
(1)
(1)
DD
DD
and V
and V
SS
SS
SS
SS
V
V
V
V
DD
SS
DD
SS
(3b)
(2b)
(4)
(4)