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ST92F120R1Q7 数据表(PDF) 9 Page - STMicroelectronics

部件名 ST92F120R1Q7
功能描述  8/16-BIT FLASH MCU FAMILY WITH RAM, EEPROM AND J1850 BLPD
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST92F120R1Q7 数据表(HTML) 9 Page - STMicroelectronics

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ST92F120 - GENERAL DESCRIPTION
1.2.4.3 Internal Circuitry: Digital I/O pin
In Figure 3 a schematic representation of an ST9
pin able to operate either as an input or as an out-
put is shown. The circuitry implements a standard
input buffer and a push-pull configuration for the
output buffer. It is evident that although it is possi-
ble to disable the output buffer when the input sec-
tion is used, the MOS transistors of the buffer itself
can still affect the behaviour of the pin when ex-
posed to illegal conditions. In fact, the P-channel
transistor of the output buffer implements a direct
diode to VDD (P-diffusion of the drain connected to
the pin and N-well connected to VDD), while the N-
channel of the output buffer implements a diode to
VSS (P-substrate connected to VSS and N-diffu-
sion of the drain connected to the pin). In parallel
to these diodes, dedicated circuitry is implemented
to protect the logic from ESD events (MOS, diodes
and input series resistor).
The most important characteristic of these extra
devices is that they must not disturb normal oper-
ating modes, while acting during exposure to over
limit conditions, avoiding permanent damage to
the logic circuitry.
All I/O pins can generally be programmed to work
also as open-drain outputs, by simply writing in the
corresponding register of the I/O Port. The gate of
the P-channel of the output buffer is disabled: it is
important to highlight that physically the P-channel
transistor is still present, so the diode to VDD
works. In some applications it can occur that the
voltage applied to the pin is higher than the VDD
value (supposing the external line is kept high,
while the ST9 power supply is turned off): this con-
dition will inject current through the diode, risking
permanent damages to the device.
In any case, programming I/O pins as open-drain
can help when several pins in the system are tied
to the same point: of course software must pay at-
tention to program only one of them as output at
any time, to avoid output driver contentions; it is
advisable to configure these pins as output open-
drain in order to reduce the risk of current conten-
tions.
Figure 4. Digital Input/Output - True Open Drain Output
PIN
OUTPUT
BUFFER
N
P
N
N
INPUT
BUFFER
ESD PROTECTION
CIRCUITRY
PORT CIRCUITRY
I/O CIRCUITRY
P
EN
EN
1


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