STMICROELECTRONICS STEVAL

STEVAL-IFP004V1
Digital input termination PCLT2
Data Brief
Features
■
Dual input channel
■
Robust with EMC
■
Wide operating range
■
Exposed pad TSSOP14
■
Flexible current limiter
■
Output driver
Description
The purpose of this demo board is to evaluate the
features of the PCLT-2A sensor input termination.
The PCLT-2A is a dual termination device for the
front-end of a 24 V DC digital input module.
Composed of an input-voltage protection, a serial
current-limiter circuit and an output driver, each
channel circuit terminates the connection
between a high-side proximity sensor and the I/O
module. Because of its IEC type programmability
and the isolated/non-isolated output options, the
PCLT offers a flexible and easy-to-design solution
for highly integrated I/O modules.
October 2007
STEVAL-IFP004V1
Rev 1
For further information contact your local STMicroelectronics sales office.
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www.st.com
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Schematic
Figure 1.
In1
In2
Vcc
Com
In1
In2
Vcc
Com
Rc_A
2.2k
Cc_A
33nF
UA
LED1 9
LED_A1
ISO1B
ILD213
0
0R
VDD_A
1
2
3
4
Opto1
Opto2
Vdd
Gnd
Out1
Out2
Vdd
Com
OUTPUT_B
1
2
3
4
OUTPUT_A
100nF
Cout
OPTO VERSION
VDD_A
ISO1A
ILD213
Dnw2
30k
VDD_B
CMOS VERSION
Dnw1
30k
6
VDD_A
5
OUT1 14
LED_A2
LED_B1
VDD_B
LED_B2
3
VDD 10
OUT2 12
LED2 8
LED1 9
OUT1 14
VDD 10
OUT2 12
LED2 8
4
1 IN1
13
13
8
Rin_A1
750R
COMp
COMs
11
COMs
11
7
2
4
3 IN2
5 VC
PCLT-2A
7 REF
Rref_A
10k
UB
COMp
1 IN1
2
4
3 IN2
5 VC
PCLT-2A
7 REF
Rref_B
10k
1
Cin_A1
22nF
Cin_A2
22nF
Rin_A2
750R
D1
SM4005
Rin_B1
750R
Cin_B1
22nF
Cin_B2
22nF
Rin_B2
750R
D2
2
INPUT_A
1
2
3
4
INPUT_B
1
2
3
4
Rc_B
2.2k
Cc_B
33nF
SM4005
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Block diagram
1
STEVAL-IFP004V1
Block diagram
STEVAL-IFP004V1
2
Revision history
Revision history
Table 1.
Document revision history
Date
Revision
22-Oct-2007
1
Changes
Initial release
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STEVAL-IFP004V1
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