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AN2846 Scheda tecnica(PDF) 4 Page - STMicroelectronics

Il numero della parte AN2846
Spiegazioni elettronici  The serial current limited termination device
PDF  35 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2846 Scheda tecnica(HTML) 4 Page - STMicroelectronics

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Application guidelines
AN2846
4/35
Doc ID 15130 Rev 1
1
Application guidelines
1.1
Features of the SCLT3-8
The SCLT is an octal input active termination device designed for 24 V DC high density input
modules used in industrial automation. Each channel circuit terminates the connection
between a high side proximity sensor and the I/O module.
The advanced features of the SCLT3-8 compared to the basic CLT3-4BT6 device are:
●
SPI for digital output count reduction
●
Doubling of input terminations: 8 inputs compared to 4
●
Input state monitoring by LEDs from the process section
●
Undervoltage alarm detection of the power bus
●
Power bus loss detection
●
5 V supply source available for external driving circuits like opto-couplers or magnetic
isolators
●
Overtemperature detection
●
Checksum data transmission through SPI for better data transfer integrity
The SCLT3-8 also features an input overvoltage protection. This input protection makes this
device robust against electromagnetic interference as defined in IEC 61000-4-x standards:
ESD, fast transient bursts, and voltage surges.
It is housed in a very low RTH exposed pad, surface mount, HTSS0P38 package to reduce
the circuit board size and the cooling pad.
Figure 1 shows the schematic block diagram for the device.
Figure 1.
Schematic block diagram
V
CS
V
DD
Input
state
register
Data
shift
register
Parity
bits
gen.
4 lines
8 lines
8 lines
Prog.
digital
filters
8 Lines
Current
reference
Oscillator
Undervoltage
alarm
Power
reset
Power
supply
/CS
SPM
SCK
MOSI
/MISO
COM
S
MISO
V
C
DVR
OSC
REF
IN
1
LD
1
IN
8
LD
8
COM
P
V
DD
Overtemperature
alarm
Write
V
DD
Shift
Ctrl
shift
register
8/16
Bits
Bits
Shift
Input
protection
and
input current
limiters
MOSI



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