TLE8110EE_13 Datasheet, PDF (29/74 Pages) Infineon Technologies AG – Overvoltage, Overtemperature, ESD -Protection

TLE 8110 EE
Smart Multichannel Switch
Diagnosis
8
Diagnosis
8.1
Diagnosis Description
The TLE8110EE provides diagnosis information about the device and about the load. Following diagnosis flags
have been implemented for each channel:
Diagnosis¹⁾
Symbol DRn[1:0]x²⁾ Device reaction
Confirmation
Procedure³⁾
Short to Ground
SCG
00_B
-
-
No Fault
OK
11_B
-
-
Open Load
OL
01_B
-
Chapter 8.1.1
Overcurrent / Overtemperature OCT
10_B
Switch-off of related channel Chapter 8.1.2
1) No priority scheme is implemented for the diagnosis detection, any new diagnosis entry will override the previous one
2) Diagnosis Register (A/B banks) bit configuration, see Chapter 12.3.2.1
3) For some diagnosis a confirmation procedure is required for a safe operation of the device, refer to Figure 17
Updating of the Diagnosis is based on a filter-dependent standard delay time (t_d) of 220µs max. This value is set
as a default. Refer to Figure 18 for details.
If SCG or OL condition is asserted and before the Diagnosis Delay Time (t_d) is elapsed a condition change occurs,
OL-to-SCG or SCG-to-OL, filter timer is not reset and latest condition before t_d expiration will be stored into the
diagnosis register.
• Application Hint: It is recommended to avoid OFF periods of the channel shorter than t_d(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”.
Data Sheet
29
Rev. 1.4, 2013-07-02