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PDF SCLT3-8BQ7 Data sheet ( Hoja de datos )
| Número de pieza | SCLT3-8BQ7 | |
| Descripción | High speed digital input current limiter | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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SCLT3-8BQ7
High speed digital input current limiter with digital filter
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Features
• 8 inputs - 8-bit SPI output
• High side input with common ground
• 5 V Voltage regulator
• Package: QFN 7x7 - 48L
• 30 V reverse polarity capable
• Adjustable current limiters
• LED output for visual status
• Optional: 16-bit mode with parity check,
temperature and voltage alarms
• Daisy chain capable
• Input digital filter with adjustable delay: 20 µs
to 3 ms
• Power dissipation: 78 mW per channel
Complies with following standards:
• IEC61000-4-2:
– ±8 kV contact discharge
– ±15 kV air discharge
Datasheet - production data
• IEC61000-4-4:
– ±4 kV
• IEC61000-4-5:
– Input: ±1 kV
– Power supply: ±2.5 kV
Application
• Programmable logic controller and remote
input modules
• High speed protected termination for digital
input with serialized SPI output
• IEC61131-2 type 1, 2 and 3
• Compliant with EN60947-5-2
Benefits
• Simplified design due to
– Built-in over voltage robustness and
immune data transfer
– Compliance with sensors and PLC's
standards
• Space saving in cost effective solution with
– Integrated QFN 7x7 package
– SPI output reducing opto-couplers quantity
• Energy efficient solution
– Energy-less input LED visual status
powered by inputs current
– Low overall dissipation versus discrete
Description
The SCLT3-8BQ7 provides an 8-line protected
digital input termination with serialized state
transfer. This device enhances the I/O module
density by cutting the dissipation (78 mW per
input) and reducing the count of opto-transistors.
An adjustable digital filter and an LED driver are
embedded in each type 3 input section. Its 2 MHz
SPI peripheral output serializes the input state
transfer to the I/O module controller.
November 2015
This is information on a product in full production.
DocID027845 Rev 2
1/18
www.st.com
1 page  
SCLT3-8BQ7
2 Characteristic information
Characteristic information
Symbol
VCC
VC
ICC
VCS
IDD
VI
IIN
IOSC
LVI
Tstg
Tamb
Pin
Vc
Vc
Vc
VCS
VDD
INI
INI
OSC
SCK
/CS
MOSI
All
Table 2. Absolute maximum ratings
Parameter name
Conditions
Value
Bus power supply DC voltage
SCLT3-8BQ7 power supply voltage
Maximum bus power supply current
500 Ω < Rc < 2.2 kΩ
Rc = 0 kΩ
-0.3 to 35
-0.3 to 30
15
Sensing bus power supply voltage
Maximum output power supply current
Input steady state voltage, I = 1 to 8
Input forward current range
Rc = 500 Ω
RI = 2.2 kΩ
-0.3 to 6
12
-30 to 35
-20 to 10
Maximum sourced oscillator current
120
Logic input voltage
-0.3 to 6
Storage temperature range
Ambient temperature range
-40 to 150
-40 to 105
Unit
V
V
mA
V
mA
V
mA
µA
V
°C
°C
DocID027845 Rev 2
5/18
18
5 Page 
SCLT3-8BQ7
Functional description
3.3.2
The SPI data transfer
The SCLT3-8BQ7 transfers its 16 data bits through the SPI within one chip select Hi-Lo-Hi
sequence. So, this length defines the minimum length that the shift register of the SPI
master controller is able to capture: 16 bits.
The Table 8 shows the 16-bit mode way the data are transferred starting from the data bits,
the control bits and ending by a stop bit.
Table 8. SPI data transfer organization versus CLT input states with SPM = 0
Bit #
LSB
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Control High Low PC4 PC3 PC2
PC1
/OTA
/UVA
Last out
Bit #
Data
Bit 8
IN 1
Bit 9
IN 2
Bit 10
IN 3
Bit 11
IN 4
Bit 12
IN 5
Bit 13
IN 6
Bit 14
IN 7
MSB
IN 8
First out
3.4
3.4.1
3.4.2
Control bit signals of the SPI transferred data frame
The power bus voltage monitoring
The UVA circuit generates the alarm /UVA that is active low when the power bus voltage is
lower than the activation threshold VCON, 17 V typical, and it is disabled high when the
power bus voltage rises above the threshold VCOFF, 18 V typical.
The over temperature alarm
The alarm signal /OTA is enabled, low state active, when the junction temperature is higher
than the activation threshold TON, 150 ºC typical, and it is disabled when the junction
temperature falls below the threshold TOFF, 140ºC typical.
DocID027845 Rev 2
11/18
18
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet SCLT3-8BQ7.PDF ] | |
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