ST AN2813 APPLICATION NOTE
AN2813
Application note
TDE1708DFT in IO-Link applications
1 Introduction
This application note investigates the possibility of using a TDE1708DFT switch for the physical layer transmitter realization of 3-wire IO-Link sensors.
The TDE1708DFT is an integrated power switch especially dedicated to proximity detectors. It can deliver up to 250 mA, enables high-side and low-side configurations and includes
a number of protections.
According to the IO-Link Communication Specification (see Section 8: References -3. and for the TDE1708DFT features - see Section 8: References - 1.) two basic slave transmitter configurations were tested (see Figure 1):
■p-switching (high-side) driver
■p-switching driver with an additional n-switching (low-side) driver (push-pull operation)
Figure 1. P-switching slave drive and p-switching with n-switching slave drive
P SWITCHING SLAVEEDRIVE |
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In the following test arrangements the input load current (ILLM) is fixed to 10 mA which represents the average master current sink value specified for a 3-wire system. The master (CQM), slave (CQL), and line capacitances are set together at 4.7 nF, corresponding to the maximum parasitic capacitance of the system.
February 2011 |
Doc ID 14923 Rev 1 |
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www.st.com
Contents |
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Contents
1 |
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. 1 |
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2 |
TDE1708DFT in high-side configuration . . . . . . . . . . . . . . . . . . . . . . . . . |
5 |
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2.1 |
High-side configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
5 |
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2.2 |
High-side configuration with a capacitive load . . . . . . . . . . . . . . . . . . . . . . |
7 |
3 |
TDE1708DFT in low-side configuration . . . . . . . . . . . . . . . . . . . . . . . . . . |
9 |
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3.1 |
Low-side configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
9 |
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3.2 |
Low-side configuration with a capacitive load . . . . . . . . . . . . . . . . . . . . . |
11 |
4 |
Push-pull configuration with TDE1708DFT . . . . . . . . . . . . . . . . . . . . . . |
13 |
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5 |
Performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
18 |
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5.1 |
Dynamic information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
18 |
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5.2 |
Temperature characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
18 |
6 |
Alternative driving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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6.1 |
Temperature characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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7 |
Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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8 |
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
24 |
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9 |
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
24 |
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List of tables |
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List of tables
Table 1. Push-pull configuration dynamic information
(VCC = 24 V; TJ = 25 °C; CL = 4.7 nF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 2. Dynamic information (VCC = 24 V; TJ = 25 °C; IL = 10 mA) . . . . . . . . . . . . . . . . . . . . . . . . 18 Table 3. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Doc ID 14923 Rev 1 |
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List of figures |
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List of figures
Figure 1. |
P-switching slave drive and p-switching with n-switching slave drive. . . . . . . . . . . . . . . . . |
. 1 |
Figure 2. |
High-side switch test configuration schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. 5 |
Figure 3. |
High-side switch configuration turn-on behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. 6 |
Figure 4. |
High-side switch configuration turn-off behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. 6 |
Figure 5. |
High-side switch test configuration schematic with a capacitive load . . . . . . . . . . . . . . . . . |
. 7 |
Figure 6. |
High-side switch configuration with a capacitive load turn-on behavior . . . . . . . . . . . . . . . |
. 8 |
Figure 7. |
High-side switch configuration with a capacitive load turn-off behavior . . . . . . . . . . . . . . . |
. 8 |
Figure 8. |
Low-side switch test configuration schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. 9 |
Figure 9. |
Low-side switch configuration turn-on behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
10 |
Figure 10. |
Low-side switch configuration turn-off behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
10 |
Figure 11. |
Low-side switch test configuration schematic with a capacitive load . . . . . . . . . . . . . . . . . |
11 |
Figure 12. |
Low-side switch configuration with a capacitive load turn-on behavior . . . . . . . . . . . . . . . |
12 |
Figure 13. |
Low-side switch configuration with capacitive load turn-off behavior . . . . . . . . . . . . . . . . . |
12 |
Figure 14. |
Push-pull test configuration schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
14 |
Figure 15. |
Push-pull configuration with capacitive load rising edge . . . . . . . . . . . . . . . . . . . . . . . . . . |
15 |
Figure 16. |
Push-pull configuration with capacitive load falling edge . . . . . . . . . . . . . . . . . . . . . . . . . . |
16 |
Figure 17. |
Software timing example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
17 |
Figure 18. |
Propagation turn-on time vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Figure 19. |
Propagation turn-off time vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
18 |
Figure 20. |
Alternative driving schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Figure 21. |
Alternative driving timings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
21 |
Figure 22. |
Delay propagation turn-on time vs. temperature (H. S. configuration) . . . . . . . . . . . . . . . . |
22 |
Figure 23. |
Delay propagation turn-on time vs. temperature (L. S. configuration) . . . . . . . . . . . . . . . . |
22 |
Figure 24. |
Propagation turn-off time vs. temperature (H. S. configuration) . . . . . . . . . . . . . . . . . . . . . |
23 |
Figure 25. |
Propagation turn-off time vs. temperature (L. S. configuration) . . . . . . . . . . . . . . . . . . . . . |
23 |
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GENERATOR
VOLTAGE LEVEL 6 PULSEL WIDTHD 
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HIGH SIDE DRIVER |
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CURRENTRSINK M! |
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configuration |
TDE1708DFT in high-side configuration |
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Figure 3. High-side switch configuration turn-on behavior(1)
1. CH1: input voltage, CH2: output voltage, CH4: output current (x10).
Figure 4. High-side switch configuration turn-off behavior(1)
1. CH1: input voltage, CH2: output voltage, CH4: output current (x10).
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7/25 1 Rev 14923 ID Doc |
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Figure |
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loadcapacitiveawithschematicconfiguration test switch side-High .5 |
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TDE1708DFT in high-side configuration |
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Figure 6. High-side switch configuration with a capacitive load turn-on behavior(1)
1. CH1: input voltage, CH2: output voltage, CH4: output current (x10).
Figure 7. High-side switch configuration with a capacitive load turn-off behavior(1)
1. CH1: input voltage, CH2: output voltage, CH4: output current (x10).
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