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.
STEVAL-IFP004V1
Digital input termination PCLT2
Data Brief
STEVAL-IFP004V1
October 2007 Rev 1 1/4
For further information contact your local STMicroelectronics sales office.
www.st.com
4
Block diagram STEVAL-IFP004V1
1 Block diagram
Figure 1. Schematic
In1
In2
Com
Vcc
INPUT_B
123
4
Cc_A
Cc_B
33nF
Rc_B
2.2k
33nF
Com
In1
In2
Vcc
INPUT_A
123
4
Rc_A
2.2k
Cin_B2
SM4005
D2
10k
PCLT-2A
11 13
Rin_B2
22nF
750R
Rref_B
324
5
7
VC
REF
IN2
COMs
LED2
8
LED_B2
22nF
COMp
OUT2
VDD
12
10
VDD_B
Rin_B1
Cin_B1
750R
1
IN1
UB
OUT1
LED1
9
14
LED_B1
SM4005
D1
Rref_A
10k
PCLT-2A
11 13
COMs
CMOS VERSION
30k
VDD_B
VDD_A
30k
Rin_A2
Cin_A2
750R
22nF
22nF
324
5
7
VC
REF
LED_A2
ILD213
Dnw1
ILD213
Dnw2
COMp
IN2
OUT2
LED2
VDD
12
10
8
12
VDD_A
87
ISO1A
34
65
ISO1B
0R
0
Rin_A1
Cin_A1
750R
1
IN1
UA
OUT1
LED1
14
9
LED_A1
OPTO VERSION
VDD_A
1234OUTPUT_B
Com
Out1
Out2
Vdd
2/4
1234OUTPUT_A
Gnd
Opto1
Opto2
Vdd
Cout
100nF
STEVAL-IFP004V1 Revision history
2 Revision history
Table 1. Document revision history
Date Revision Changes
22-Oct-2007 1 Initial release
3/4
STEVAL-IFP004V1
y
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