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TLE8110ED bảng dữ liệu(PDF) 28 Page - Infineon Technologies AG

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Giải thích chi tiết về linh kiện  Smart Multichannel Low Side Switch with Parallel Control and SPI Interface
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Data Sheet
28
Rev. 1.0
2018-03-07
TLE8110ED
Smart Multichannel Low Side Switch with Parallel Control and SPI Interface
Diagnosis
8
Diagnosis
8.1
Diagnosis Description
The TLE8110ED provides diagnosis information about the device and about the load. Following diagnosis flags
have been implemented for each channel:
Updating of the Diagnosis is based on a filter-dependent standard delay time (td) of 220µs max. This value is
set as a default. Refer to Figure 17 for details.
If SCG or OL condition is asserted and before the Diagnosis Delay Time (td) is elapsed a condition change
occurs, OL-to-SCG or SCG-to-OL, filter timer is not reset and latest condition before td expiration will be stored
into the diagnosis register.
• Application Hint: It is recommended to avoid OFF periods of the channel shorter than td(max) (220µs) in
order to ensure the filter time is expired and the correct diagnosis information is stored.
• Application Hint: In specific application cases - such as driving Uni-Polar Stepper Motor - it might be
possible, that reverse currents flow for a short time, which possibly can disturb the diagnosis circuit at
neighboring channels and cause wrong diagnosis results of those channels. To reduce the possibility, that
this effect appears in a certain timing range, the filter time of Channels 7 to 10 can be extended to typ.
2.5ms or typ. 5ms by setting the “Diagnosis Blind Time” - Bits (DBTx). If Channels 7 to 10 are used for driving
loads causing reverse currents, they influence each other and additionally might affect Channels 5 and 6.
It is recommended to use the channels 7 + 8 and 9 + 10 as pairs for anti-parallel control signals, such as for
the stepper motors. For logic setting details, see chapter “Control of the Device”.
8.1.1
Open Load diagnosis
If an OL is read out of the Diagnosis Register, the following procedure is required in order to confirm the
channel status and ensure a safe operation of the device:
After reading the OL [01B] in the diagnosis register (Chapter 12.3.2)
1. Switch-OFF for t ≥ td(max) the related channel (via serial or direct control, see (Chapter 12.3.3) and
(Chapter 12.3.4),
2. Read again the diagnosis register
a) If OL is confirmed Then take actions according to system implementation,
3. Continue normal operation.
Diagnosis 1)
1) No priority scheme is implemented for the diagnosis detection, any new diagnosis entry will override the previous one.
Symbol DRn[1:0]x
2)
2) Diagnosis Register (A/B banks) bit configuration, see
Chapter 12.3.2.1.
Device reaction
Confirmation
Procedure 3)
3) For some diagnosis a confirmation procedure is required for a safe operation of the device, refer to
Figure 16.
Short to Ground
SCG
00B
--
No Fault
OK
11B
--
Open Load
OL
01B
-
Chapter 8.1.1
Overcurrent/
Overtemperature
OCT
10B
Switch-off of related
channel
Chapter 8.1.2


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