TLE8110ED datasheet(28/74 Pages) INFINEON

28 / 74 page

Data Sheet

Rev. 1.0

2018-03-07

TLE8110ED

Smart Multichannel Low Side Switch with Parallel Control and SPI Interface

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) 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

11B

Open Load

01B

Chapter 8.1.1

Overcurrent/

Overtemperature

OCT

10B

Switch-off of related

channel

Chapter 8.1.2

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