SCLT3-8BT8 STMicroelectronics, SCLT3-8BT8 Datasheet

IC SERIAL TERM 8-LINE 38HTSSOP

SCLT3-8BT8

Manufacturer Part Number
SCLT3-8BT8
Description
IC SERIAL TERM 8-LINE 38HTSSOP
Manufacturer
STMicroelectronics
Type
Serialr
Datasheet

Specifications of SCLT3-8BT8

Number Of Terminations
8
Voltage - Supply
9 V ~ 35 V
Operating Temperature
-25°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
38-TSSOP Exposed Pad, 38-eTSSOP, 38-HTSSOP
Number Of I/os
8
Operating Supply Voltage
9 V to 35 V
Supply Current (max)
2.3 mA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 25 C
Mounting Style
SMD/SMT
Data Bus Width
8 bit, 16 bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-10100-5

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Features
November 2009
8-input circuit in common ground low side
topology
Wide range input DC voltage V
– On state threshold : < 11 V with R
– Off state threshold: I
– Protected against -30 V reverse polarity
2.35 mA active current limiter with 10%
tolerance
– Drastic dissipation reduction:
Input digital filter with adjustable delay:
20 µs to 3 ms
Energy-less LED visual status driver
Input logic state transfer through a 2 MHz SPI
– Programmable 8 / 16-bit register length
– Multi SCLT connection in daisy chain
– Chip temperature OTA and under voltage
– Multi parity bits and power loss detection
– Drastic reduction of isolated coupler count
Power supply and input protection, R
– IEC 61000-4-4 transient burst : ± 4 kV
– IEC 61000-4-5 voltage surge: ± 1 kV
– IEC 61000-4-2 ESD: ± 8 kV in contact:
Wide range power supply voltage V
– + 9 V to + 35 V with 10 mA output current
– Protected against -30 V reverse polarity
78 mW max. per input
UVA alarms
with stop bits
and I/O of the field bus ASIC
minimum
minimum
± 15 kV in air minimum
Protected digital input termination with serialized state transfer
in
> 1.5 mA or V
I
: -30 V to 35 V
C
I
I
:
= 2.2 kΩ:
= 2.2 kΩ
i
Doc ID 15191 Rev 3
> 5 V
Applications
Description
The SCLT3-8BT8 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.
Digital inputs for programmable logic controller
and decentralized I/O modules
Digital input with serialized state transfer
Enabling digital inputs to meet type 1 and 3
characteristics of IEC 61131-2
EN60947-5-2 2-wire proximity sensor
compatibility
SCLT3-8BT8
HTSSOP-38
SCLT3-8BT8
www.st.com
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SCLT3-8BT8 Summary of contents

Page 1

... EN60947-5-2 2-wire proximity sensor compatibility Description = 2.2 kΩ: I The SCLT3-8BT8 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 ...

Page 2

... SPI transfer speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Power bus voltage monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Over temperature alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Parity checksum bits calculation and transfer . . . . . . . . . . . . . . . . . . . . 14 SPI hardware interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Loss of V power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 CC Interfacing the SPI section to the I/O controller through optotransistors 25 Considerations on the power section . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Doc ID 15191 Rev 3 SCLT3-8BT8 ...

Page 3

... SCLT3-8BT8 3.5.2 3.6 Under voltage alarm setting for IEC and device-net applications . . . . . . . 27 3.7 Input operation for the device-net applications . . . . . . . . . . . . . . . . . . . . . 28 3.8 Dissipation calculation in the SCLT3-8 circuit . . . . . . . . . . . . . . . . . . . . . . 28 4 Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 6 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Considerations on the logic section . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 ...

Page 4

... OSC 4/33 Protected input < V < V < V < lines lines 7 lines 4 lines Current reference Over temperature Oscillator Clock divider alarm Doc ID 15191 Rev 3 SCLT3-8BT8 MISO MISO MISO /MISO /MISO /MISO COM COM COM WRITE WRITE WRITE WRITE SHIFT SHIFT SHIFT SHIFT MOSI ...

Page 5

... SCLT3-8BT8 1.1 I/O pin descriptions Table 1. I/O pin descriptions Name Type IN Power input I LD Power output I V Power input C V Signal input CS COM Ground P V Power output 5 V logic power supply DD COM Ground S REF Signal input DVR Logic input OSC Signal input ...

Page 6

... State transfer State transfer MISO MISO MISO SPI SPI SPI O-T O-T O-T /MISO /MISO /MISO PHA PHA PHA POL POL POL MOSI MOSI MOSI SPM SPM SPM O-T = opto-transistor O-T = opto-transistor O-T = opto-transistor or isolator or isolator or isolator 2.1mA 2.6mA ON 11V 2 2.5 3 SCLT3-8BT8 ...

Page 7

... SCLT3-8BT8 2 Functional description 2.1 Input power section The SCLT3 8-line input termination device designed for automation applications. It provides the front-end circuitry of a digital input module (I/O) in industrial automation. Available in an eight-channel configuration, it offers a high-density termination by minimizing the conducting dissipation and the external component count. ...

Page 8

... FT CKF (R ) OSC OSC Table 2. Fast 60 kHz 20 kHz 20 µs 50 µs 51 kΩ 150 kΩ 10 µs 25 µs COM COM Doc ID 15191 Rev 3 SCLT3-8BT8 Filter Medium Slow 5 kHz 300 Hz 230 µs 3 kΩ 1.3 MΩ 115 µs 1500 µ ...

Page 9

... SCLT3-8BT8 Figure 6. Two-step digital filter placed after the analog section of the logic input CKF CKF 2.4 Operation of the SCLT with the SPI bus 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. This data transfer operation ...

Page 10

... Then the other data bits are written out on the falling edge of the clock signal SCK. The output MISO goes to high impedance tri-state shown on goes in high state. 10/ 250kΩ 2kΩ SCK ESD HBM Doc ID 15191 Rev 3 SCLT3-8BT8 = When POL PHA 2pF SCLT3-8 Table 5 when the /CS signal ...

Page 11

... SCLT3-8BT8 2.5.5 SPI shift register operation selector SPM The input SPM allows the operation of the SPI shift register to be configured for an 8-bit or 16-bit operation. When SPM is set low (COM input state bits and the control bits. When SPM is set high (V 8-bit mode and transfers the eight input state bits in a faster transfer process. ...

Page 12

... In between two transfer sequences the output driver of the SPI circuit should go in high impedance before any new transfer operation so falling edge of the chip select /CS: t < DIS DT 12/ MSB MSB 14 S > < > Doc ID 15191 Rev 3 SCLT3-8BT8 LSB MSB LSB MSB S M Table 9. DT ...

Page 13

... SCLT3-8BT8 Figure 10. SPI shift register data transfer sequence versus SCLT input states /CS=”1” /CS=”1” /CS /CS SCK1 SCK1 SCK1 SCK1 SCK2 SCK2 SCK15 SCK15 SCK16 SCK16 SCK16 SCK16 /CS /CS SCK1 SCK1 2.7 Control bit signals of the SPI transferred data frame 2 ...

Page 14

... P P ESD ESD SCLT3-8 SCLT3-8 , 150 °C typical, and it is disabled when the junction ON 135 °C typical as shown in OFF OFF OFF OFF Doc ID 15191 Rev 3 SCLT3-8BT8 1ms delay filter 1ms delay filter /UVA /UVA Figure 12 CCON CCON CCON CCOFF CCOFF CCOFF ...

Page 15

... SCLT3-8BT8 It is supposed such disturbances affect one bit at a time during the SPI frame transfer. EFT burst repetition rate is about 200 µs (5 kHz) and the SPI 16-bit frame should last less than 160 µs. A parity bit on the full byte should be obtained by applying an “exclusive NOR” Boolean operation to the eight logic input states (PC even ...

Page 16

... Power loss with communication attempt Loss of power Loss of power UV Alarm UV Alarm 15V 15V ~ Doc ID 15191 Rev 3 SPI status Power good Power good 17V 17V 19V 19V + IEC61131-2 level IEC61131-2 level 11V 11V 13V 13V = MISO (non inverting isolator) = MISO (non inverting isolator) ASIC ASIC SCLT3-8BT8 ...

Page 17

... SCLT3-8BT8 Table 6. Absolute ratings Symbol Pin MISO LV O /MISO SCK LV I /CS MOSI REF REF I OSC OSC P All DIS T All J Table 7. Thermal resistance Symbol Thermal resistance junction to ambient R TH(j-a) Copper thickness= 35 µm, printed board copper surface cm² Parameter name and conditions Bus power supply DC voltage, 500 Ω < R SCLT power supply voltage kΩ ...

Page 18

... Clock period range Minimum clock active width Clock duty cycle Minimum logic inputs rise and fall times Logic input voltage Maximum LED output voltage Operating ambient temperature range Operating junction temperature range , Doc ID 15191 Rev 3 SCLT3-8BT8 Value Unit > 500 Ω 1.5 MΩ 500 Ω ...

Page 19

... SCLT3-8BT8 Table 9. DC electrical characteristics Symbol Pin Name I IN Input limiting current LIM V IN Low current input voltage LOW Current limiter activation V IN LIM TH voltage V IN, V Clamping voltage state input voltage Input on state threshold TH_ON V IN Input off state threshold TH_OFF ...

Page 20

... I 3. Corresponding with Corresponding 1.5 mA 20/33 (1) (continued) Conditions Under voltage alarm R =1.5 MΩ 2.2 kΩ 2.2 kΩ with reference to COM 2.2 kΩ. I Doc ID 15191 Rev 3 Min. Typ. Max. =120 kΩ 1.25 1.27 1.30 - 0.1 1 1.7 = COMs voltage, unless otherwise P SCLT3-8BT8 Unit - ...

Page 21

... SCLT3-8BT8 Table 10. SPI serial bus link electrical characteristics Symbol Pin Name t SCK Enable lead time LD t SCK Clock hold time HC t /CS Transfer delay time DT C Input capacitance IN SCK, t /CS, Input filter time constant RC MOSI I Input pull up current IN t MOSI Data setup time ...

Page 22

... Test according to standard with schematic described in application section. P versus reference resistance R LIM I (mA) LIM 6 5.5 5 4.5 4 3 (kΩ) 1.5 REF Doc ID 15191 Rev 3 SCLT3-8BT8 (1) Value ± 2.5 ±4 (2) ±1 ± 2.5 ±1 ±15 ± 8 ±15 ± 8 REF ° Unit ...

Page 23

... SCLT3-8BT8 Figure 15. Typical limiting current I Figure 16. Relative variation of minimum filter time T temperature T versus junction temperature T LIM I (mA) LIM 2.8 Ω R ref = 15 k with 2 2.7 2.6 2.5 2.4 2.4 2.3 2.3 2.2 2.2 T (°C) 2 (25°C) FT MIN FT MIN 1.15 1.1 1. ...

Page 24

... MOSI /CS /CS SCLT SCK SCK 1 MISO MISO MOSI MOSI /CS /CS = 1Mbps coupler = 0 and C PHA POL Doc ID 15191 Rev 3 SCLT3-8BT8 is connected to the MISO N can be kept open or grounded Case 2: 8-DI and 8-DO SCLT SCK SCK SCK SCK SCK MISO MISO MISO MISO MISO ...

Page 25

... SCLT3-8BT8 3.1.1 Interfacing the SPI section to the I/O controller through optotransistors Figure 18. Opto-couplers connection between dual SCLT circuit and their master bus controller 5V.REG 5V.REG V DD1 SCLT3 - 8 SPI data output 3.2 High speed operation with magnetic isolators Figure 19. Connection of SCLT with a magnetic or capacitive coupler for alarm ...

Page 26

... PPI PPI +/- 1kV with 42 Ω +/- 1kV with 42 PPI PPI V V PPI PPI GND GND PE/FE PE/FE , this clamping protection is effective against the fast I = 500 Ω, the supply pin V C Doc ID 15191 Rev 3 SCLT3-8BT8 SCLT3-8 SCLT3-8 ...

Page 27

... SCLT3-8BT8 3.5 Fast transient burst immunity 3.5.1 Considerations on the power section The EFT protection is achieved with the same strategy as ESD and surge protection. An input capacitor C These capacitors play a key role in suppressing front-end electrical stresses. Their capacitance can be about 22 nF (to validate by test for both EFT and RFI tests). ...

Page 28

... UVA UVA UVA PD PD Count Drop voltage ( 500 x 0.007 - 2200 x 0.0026 = 24 500 x 0.0018 = 29.1 Printed circuit board, FR4 epoxy 120 single layer, copper thickness = 35 µm 100 (mm² Doc ID 15191 Rev 3 SCLT3-8BT8 SCLT3 -8 SCLT3 - SMAJ30A = SMAJ30A 1.8 kΩ, the ...

Page 29

... SCLT3-8BT8 4 Ordering information scheme Figure 23. Ordering information scheme SCLT = Serial output current limiting termination current setting 8 = Eight channels B = EMC Level ± HTSSOP-38 package according to IEC 61000-4-5 Doc ID 15191 Rev 3 Ordering information scheme SCLT 29/33 ...

Page 30

... D P 30/33 Ref 14° Ø Ø Doc ID 15191 Rev 3 SCLT3-8BT8 Dimensions Millimeters Inches Min. Typ. Max. Min. Typ 1 0.05 - 0.15 0.002 - 0.85 0.9 0.95 0.033 0.035 0.037 0.17 - 0.27 0.007 - 0.09 - 0.20 0.003 - 9.60 9.70 9.80 0.378 0.382 0.386 4.30 4 ...

Page 31

... SCLT3-8BT8 Figure 24. SCLT3-8BT8 footprint (dimensions in mm) 0.5 0.60 7.10 4.50 6.60 0.3 Doc ID 15191 Rev 3 Package information 1.30 3.30 31/33 ...

Page 32

... HTSSOP-38 SCLT3-8BT8 HTSSOP-38 Revision 1 Initial release. 2 Updated mechanical data for package HTSSOP-38. Updated parameters in 3 Figure 15, Figure 16, and Doc ID 15191 Rev 3 SCLT3-8BT8 Weight Base qty Delivery mode 114 mg 2500 Tape and reel 114 mg 50 Tube Changes Table 9 and Table 10. Added Figure Figure 22 ...

Page 33

... SCLT3-8BT8 Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...

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