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AN3031 Datasheet(PDF) 8 Page - STMicroelectronics

Part # AN3031
Description  SCLT3-8 input termination demonstration board
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3031 Datasheet(HTML) 8 Page - STMicroelectronics

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Description
AN3031
8/28
Doc ID 16144 Rev 1
2.2
STEVAL-IFP007V1 demonstration board
The STEVAL-IFP007V1 connection diagram is provided in Figure 4, 5 and 6. It is compliant
with type 1 and 3 input characteristics in accordance with the IEC 61131-2 standard. The
application is typically supplied from two sides using two independent power supplies -
primary and secondary. The primary power supply has a typical voltage of 24 VDC
(functional range from 16 to 35 VDC), and is connected to the CN9 terminal. The secondary
supply is connected through the CN10 (SPI) socket. This supply voltage level derives from
the microcontroller or control logic supply voltage. It is considered within range from 3 VDC
up to 5 VDC. For immunity considerations, the board design is optimized for 5 V signal
levels. If interconnection of the board with 3 V or 3.3 V logic is required, resistors R48, R49,
R59 and R60 should be replaced by a value of approximately 160
Ω.
Special attention should be given top the input and supply line resistors (RI, RC). Their type
dramatically influences the application’s EMC - high voltage surge robustness (IEC 61000-
4-5). The resistors should be capable of sustaining high peak voltage and current levels. A
suitable type is, for example, the MELF MMB0207 from VISHAY®. Peak ratings of such
resistors are 70 W, or 3 kV. Standard SMD 1206 resistors are not recommended, as their
rating are much lower. Therefore, the application fails at surge levels close to 1 kV
(differential mode, 42
Ω / 0.5 µF coupling).
Each SCLT3-8BT8 input signal is additionally filtered with a capacitor of 1 nF. These
components increase capacitive coupling to the GND reference and therefore maximize
EFT immunity. The capacitor values can be increased to 22 nF, for example, to achieve even
higher immunity levels, but with the drawback of bandwidth limitation.
Each SPI signal (CS, SCK, and MOSI) is filtered close to each SCLT3-8BT8 chip with an
integration R-C cell which limits the bandwidth to suppress noise sensitivity. Values used in
the application are 220
Ω - 100 pF, which correspond to the maximum communication baud
rate of approximately 3 Mbps. It is up to the application designer to set the appropriate R-C
values in order to suppress high frequency noise. Naturally, increasing the capacitor values
renders the signals more stable, which has a positive effect on the immunity, but the
communication bandwidth is lower.


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