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BD1020HFV データシート(PDF) 6 Page - Rohm

部品番号 BD1020HFV
部品情報  Temperature Sensor IC Analog Output
Download  13 Pages
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メーカー  ROHM [Rohm]
ホームページ  http://www.rohm.com
Logo ROHM - Rohm

BD1020HFV データシート(HTML) 6 Page - Rohm

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BD1020HFV
6/9
TSZ02201-0M2M0F515090-1-2
© 2015 ROHM Co., Ltd. All rights reserved.
06.Nov.2015 Rev.001
www.rohm.com
TSZ22111・15・001
Operational Notes
– continued
11.
Unused Input Pins
Input pins of an IC are often connected to the gate of a MOS transistor. The gate has extremely high impedance and
extremely low capacitance. If left unconnected, the electric field from the outside can easily charge it. The small charge
acquired in this way is enough to produce a significant effect on the conduction through the transistor and cause
unexpected operation of the IC. So unless otherwise specified, unused input pins should be connected to the power
supply or ground line.
12.
Regarding the Input Pin of the IC
This monolithic IC contains P+ isolation and P substrate layers between adjacent elements in order to keep them
isolated. P-N junctions are formed at the intersection of the P layers with the N layers of other elements, creating a
parasitic diode or transistor. For example (refer to figure below):
When GND > Pin A and GND > Pin B, the P-N junction operates as a parasitic diode.
When GND > Pin B, the P-N junction operates as a parasitic transistor.
Parasitic diodes inevitably occur in the structure of the IC. The operation of parasitic diodes can result in mutual
interference among circuits, operational faults, or physical damage. Therefore, conditions that cause these diodes to
operate, such as applying a voltage lower than the GND voltage to an input pin (and thus to the P substrate) should be
avoided.
Figure 6. Example of monolithic IC structure
13.
Please connect it with the temperature measurement part (GND line usually) to make thermal conductivity with the
mount board side the best though the PG pin (Pin No.2) is hindered and doesn't exist about OPEN even if it connects it
with GND.
N
N
P
+
P
N
N
P
+
P Substrate
GND
N
P
+
N
N
P
+
N P
P Substrate
GND
GND
Parasitic
Elements
Pin A
Pin A
Pin B
Pin B
B
C
E
Parasitic
Elements
GND
Parasitic
Elements
C
B
E
Transistor (NPN)
Resistor
N Region
close-by
Parasitic
Elements


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