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CLT01-38SQ7
High speed digital input current limiter
Datasheet - production data
• IEC61000-4-5:
– Input: ±1 kV
– Power supply: ±2.5 kV
Application
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• 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
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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
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
• LED output for visual status
• Optional: 16-bit mode with parity check,
temperature and voltage alarms
• Daisy chain capable
• Power dissipation: 78 mW per channel
Complies with following standards:
• IEC61000-4-2:
– ±8 kV contact discharge
– ±15 kV air discharge
Description
The CLT01-38SQ7 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.
Its 6.25 MHz SPI peripheral output serializes the
input state transfer to the I/O module controller.
• IEC61000-4-4:
– ±4 kV
July 2015
This is information on a product in full production.
DocID028182 Rev 1
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www.st.com
Circuit block diagram
1
CLT01-38SQ7
Circuit block diagram
Figure 1. circuit block diagram
VDD
DVR
MISO, /MISO control
VDD
LD1
VIN < VR
8 lines
Data state register
VR
Input state register
IN1
Logic control
For i = 1 to 8
MISO
/MISO
8 lines
COMPP
Write
VDD
MOSI
Shift
VDD
Capture
SCK
VDD
Transfer
logic
Current
reference
8 lines
REF
MOSI
VDD
/CS
Shift
16- bit
Control state register
Parity
bits generator
4 lines
SPM
Power
supply
Power
reset
VDD
Under voltage
alarm
Over temperature
alarm
Figure 2. Basic application schematic
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DocID028182 Rev 1
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CLT01-38SQ7
1.1
Circuit block diagram
I/O pin description
Table 1. I/O pin descriptions
Name
Type
INI
Power input
LDI
Power output
VC
Power input
24 V sensor power supply
13
VCS
Signal input
24 V sensor power supply sensing input
14
COMP
Ground
VDD
Description
Pin #
Logic input with current limitation, I = 1 to 8
16, 17, 18, 19,
21, 22, 23, 24
LED output driver with current regulation, I =
1 to 8
34, 35, 36, 37,
38, 39, 40, 41
Power ground of power sensor supply
Power output 5 V logic power supply
7, 15, 20, 31
1
COMS
Ground
Signal ground of logic / output section
43
REF
Signal input
Input current limiter reference setting
42
SPM
Signal input
SPI shift register length selector:
-SPM to GND: 16 bits
-SPM to VDD: 8 bits
4
/CS
Logic input
SPI chip Select signal
48
SCK
Logic input
SPI serial clock signal
47
MOSI
Logic input
SPI serial data input signal
46
DVR
Logic input
SPI data selector:
-DVR to GND: pin 31 = MISO
-DVR to VDD: pin 31 = /MISO
2
MISO
or
/MISO
Logic output
SPI serial data output signal or inverting SPI
serial data output signal
44
TAB
Substrate
Exposed pad: connected to die substrate, to
be connected to COMP
TAB
Not connected (or to be connected to COMP)
3, 5, 6, 8, 9, 10, 11, 12, 25,
26, 27, 28, 29, 30, 32, 33,
45
NC
DocID028182 Rev 1
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Circuit block diagram
CLT01-38SQ7
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Figure 3. Pinout description of the QFN7x7-48L version (top view)
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The package is the QFN7x7-48L exposed pad that improves ground cooling transfer of input
dissipation to the printed board.
Figure 4. Basic module input characteristics in type 3
30
2.1mA
VI (V)
RI = 2.2 kΩ
VI = V IN + RI x IIN
25
2.6mA
ON
RI
20
SCLT
15
11V
10
OFF
5
0
0
4/18
0.5
1
1.5
IIN (mA)
DocID028182 Rev 1
2
2.5
3
CLT01-38SQ7
2
Characteristic information
Characteristic information
Table 2. Absolute maximum ratings
Symbol
Pin
VCC
Vc
VC
Conditions
Value
Unit
Bus power supply DC voltage
500 Ω < Rc < 2.2 kΩ
-0.3 to 35
V
Vc
CLT01-38SQ7 power supply voltage
Rc = 0 kΩ
-0.3 to 30
V
ICC
Vc
Maximum bus power supply current
15
mA
VCS
VCS
Sensing bus power supply voltage
-0.3 to 6
V
IDD
VDD
Maximum output power supply current
Rc = 500 Ω
12
mA
VI
INI
Input steady state voltage, I = 1 to 8
RI = 2.2 kΩ
-30 to 35
V
IIN
INI
Input forward current range
-20 to 10
mA
LVI
SCK
/CS
MOSI
Logic input voltage
-0.3 to 6
V
Storage temperature range
-40 to 150
°C
Ambient temperature range
-40 to 105
°C
Tstg
Tamb
All
Parameter name
DocID028182 Rev 1
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Characteristic information
CLT01-38SQ7
Table 3. Operating conditions
Symbol
Pin
VCC
Vc
VDD
VDD
Internal logic power supply voltage
IDD
VDD
Internal logic power supply voltage
Rc > 500 Ω
VI
IN
Input repetitive steady state voltage
RI = 2.2 kΩ(2)
VLD
LDI
Maximum LED output voltage, I = 1 to 8
FIN MAX
IN
Maximum single input frequency
FSCK MAX
LV
Tamb
Parameter name
Conditions
Bus power supply steady state voltage
Value
Unit
15 to 35(1)
V
5
V
10
mA
-30 to 35
V
2.7
V
200
kHz
6.25
MHz
0 to 5.5
V
VCC ≤30 V
-40 to 85
°C
VCC ≤ 24 V
Rth(j-a) = 70 °C/W
-40 to 105
°C
-40 to 150
°C
Rc > 500 Ω
8-bit mode
Maximum SPI clock frequency
SCK
/CS
MOSI Logic input/output voltages
MISO
/MISO
ALL
Operating ambient temperature range
Operating junction temperature range
Tj
1. 32 V in DC; 35V during 0.5 s max
2. VI = VIN + RI x IIN
Table 4. DC electrical characteristics based on figure 2 application environment
Symbol
Pin
Name
Conditions
Min.
Typ.
Max.
Unit
2.1
2.35
2.6
mA
Input Current limitation
ILIM
IN
Input limiting current
VIN = 5.5 to 26 V
RI = 2.2 kΩ
ION
LDI
On state LED current
VI = 11 V
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2
mA
CLT01-38SQ7
Characteristic information
Table 5. SPI electrical characteristics (Tj = 25 °C, VCC = 24 V, VDD = 5 V respect to COM ground pin;
unless otherwise specified)
Symbol
FCK
Pin
SCK
Name
Conditions
Min.
Typ.
Clock frequency
Max.
Unit
6.25
MHz
TCAPTURE
Minimum data capture time
FCK = 6.25 MHz
2.5
µs
TPROPA
Data transfer/Propagation
time
FCK = 6.25 MHz
4
µs
25
ns
TS
MOSI
Data setup time
MOSI toggling to SCK
rising
TD
MISO
Write out propagation time
SCK falling to MISO
toggling, COUT = 10 pF
TLD
SCK
Enable lead time
/CS falling to SCK
rising
80
ns
THC
SCK
Clock hold time
SCK falling to /CS
rising
160
ns
TDT
/CS
Transfer delay time
/CS rising to /CS falling
TH
MOSI
Data hold time
SCK rising to MOSI
toggling
TDIS
MISO
Data output disable time
/CS rising to MISO
disabled
200
ns
LVIH
MOSI
SCK
/CS
Logic input high voltage
Share of VDD
70
%
Logic input low voltage
Share of VDD
30
Logic output high voltage
IOH = 3mA
4
Logic output low voltage
IOL = 3mA
LVIL
LVOH
/MISO
MISO
LVOL
50
150
25
%
4.75
TRO, TFO
MISO
/MISO
MISO signal fall/rise time
IMISO = 3mA
20
TA
MISO
Output access time
/CS falling to MISO
toggling
40
DuCy
SCK
Clock duty cycle
DocID028182 Rev 1
ns
ns
0.25
25
ns
V
1
V
ns
80
ns
75
%
7/18
18
Characteristic information
CLT01-38SQ7
Figure 5. Time diagram
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DocID028182 Rev 1
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Characteristic information
Table 6. Electromagnetic compatibility ratings
Symbol
Pin
VPPB
VI
VPP
Parameter name(1)
Value
Unit
Peak pulse voltage burst, IEC61000-4-4(2)
4
KV
VI
Peak pulse voltage surge, IEC61000-4-5
1
kV
VPP
VCC
Peak pulse voltage surge, IEC61000-4-5
2.5
kV
VESD
VIN
ESD protection, IEC 61000-4-2, per input
– air
– contact
15
8
kV
1. Test set-up, see application Figure 2.
2. See AN3031.
DocID028182 Rev 1
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Functional description
CLT01-38SQ7
3
Functional description
3.1
Operation of the CLT01-38SQ7 with the SPI bus (CPOL = 0,
CPHA = 0)
The SPI bus master controller manages the data transfer with the chip select signal /CS and
controls the data shift in the register with the clock SCK signal.
Figure 6. Serial data format frame
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The transfer of the CLT01-38SQ7 input states in the SPI registers starts when the Chip
Select /CS signal falls and ends when this /CS is rising back.
The transfer of data out of the CLT01-38SQ7 slave MISO output starts immediately when
the chip select /CS goes low.
Then, the input MOSI is captured and presented to the shift register on each rising edge of
the clock SCK. And the data are shifted in this register on each falling edge of the serial
clock SCK, the data bits being written on the output MISO with the most significant bit first.
3.1.1
The serial data Input MOSI
This input signal MOSI is used to shift external data bits into the CLT01-38SQ7 register from
the most significant MSB bit to the lower significant one LSB. The data bits are captured by
the CLT01-38SQ7 on the rising edge of the serial clock signal SCK.
3.2
The SPI data transfer operation
3.2.1
The SPI data frame
Depending on the biasing of the SPM pin, the data frame is 8-bits or 16-bits. The selected
structure of the SPI is a 16-bit word in order to be able to implement the input state data and
some control bits such as the UVA alarm, the 4 checksum bits and the two low & high state
stop bits.
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DocID028182 Rev 1
CLT01-38SQ7
3.2.2
Functional description
The SPI data transfer
The CLT01-38SQ7 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 7 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 7. 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 #
Bit 8
Bit 9
Bit 10
Bit 11
Bit 12
Bit 13
Bit 14
MSB
Data
IN 1
IN 2
IN 3
IN 4
IN 5
IN 6
IN 7
IN 8
First out
3.3
Control bit signals of the SPI transferred data frame
3.3.1
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.
3.3.2
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.
DocID028182 Rev 1
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Functional description
3.3.3
CLT01-38SQ7
The parity checksum bits calculation and transfer
The aim of the parity checksum bit is to detect one error in the transferred SPI word. Several
parity checksum bits are generated and transmitted through the SPI on the control bit #2 to
#5.
In order to calculate parity bit, “exclusive NOR” operations are performed as follow:
Table 8. CLT01-38SQ7 parity bit calculation example
3.4
IN8
IN7
IN6
IN5
IN4
IN3
IN2
IN1
1
0
0
1
1
0
0
1
PC1
PC2
PC3
PC4
1
1
1
1
Loss of VCC power supply
The operation of the CLT01-38SQ7 is extended below the levels required in the IEC 611312 standard to allow the implementation of the under voltage alarm UVA as described the SPI
control bit section.
If there is no more power feeding on the VCC input, the CLT01-38SQ7 chip goes to sleep
mode, and the MISO output is forced in low state during SPI transfer attempt. The last SPI
control data bit is a stop bit placed normally in high state all time: the loss of power supply is
detected by checking its state: if low, the output is disabled by the internal power reset POR.
This POR signal is active in low state when VC is less than 9V or the internal power supply
VDD is less than 3.25 V.
Table 9. Logic state of the SPI output versus the power loss signal POR and the SPI
chip select /CS
12/18
POR
/CS
MISO
/MISO
SPI status
1
1
Z
Z
Normal with no communication
1
0
1
0
Normal with communication
1
0
0
1
Normal with communication
0
1
Z
Z
Power loss with no communication
0
0
0
1
Power loss with communication attempt
DocID028182 Rev 1
CLT01-38SQ7
Functional description
Figure 7. Logic status of the SCLT3-8BQ7 power supply
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Figure 8. Typical limiting current ILIM versus reference resistance RREF
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Figure 9. Typical limiting current ILIM versus junction temperature TJ
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DocID028182 Rev 1
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Functional description
CLT01-38SQ7
Figure 10. Relative variation of minimum filter time tFT versus junction temperature TJ
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DocID028182 Rev 1
CLT01-38SQ7
4
Package information
Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
QFN7x7-48L package information
Figure 12. QFN7x7-48L package outline
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DocID028182 Rev 1
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Package information
CLT01-38SQ7
Table 10. QFN7x7-48L package mechanical data
Dimensions
Ref.
Inches(1)
Millimeters
Min.
Typ.
Max.
Min.
Typ.
Max.
0.80
0.90
1.00
0.0315
0.0354
0.0394
A1
0.02
0.05
0.0008
0.0020
A3
0.203
A
b
0.18
0.25
0.008
0.30
0.0071
D
7.00
0.275
E
7.00
0.275
e
0.50
0.019
0.0118
D2
5.00
5.15
5.25
0.197
0.203
0.206
E2
5.00
5.15
5.25
0.197
0.203
0.206
K
0.20
L
0.30
0.015
0.019
0.008
0.40
0.50
0.011
1. Values in inches are converted from mm and rounded to 4 decimal digits.
16/18
0.0100
DocID028182 Rev 1
CLT01-38SQ7
5
Ordering information
Ordering information
Figure 13. Ordering information scheme
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Table 11. Ordering information
6
Order code
Marking
Package
Weight
Base qty
Delivery
mode
CLT01-38SQ7
CLT01-38SQ7
QFN7x7-48L
114 mg
2500
Tape and reel
Revision history
Table 12. Document revision history
Date
Revision
31-July-2015
1
Changes
Initial release.
DocID028182 Rev 1
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CLT01-38SQ7
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