TLE8201R datasheet(26/45 Pages) INFINEON

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TLE 8201R

Data Sheet Rev. 2.0

2006-06-07

4.4.1.3

Open Load

Open-load detection in ON-state is implemented in the low-side switches of the bridge

outputs: When the current through the low side transistor is lower than the reference

current

OCD in ON-state for longer than the open-load detection delay time tdOC, the

according open-load diagnosis bit is set. The output transistor, however, remains ON.

The open load error bit is latched and can be reset by the SPI status register reset or by

a power-on reset.

As an example, if a motor is connected between outputs OUT 1 and OUT 2 with a broken

wire as shown in Figure 10, the resulting diagnostic information is shown in Table 5

Figure 10

Open load example

Table 5

Open load diagnosis example

Control

Diagnostic information

motor

connected

motor

disconnected

Remark on Open

Load Detection

LS1

HS1

LS2

HS2

motor

rotation

LS1

OpL

LS2

OpL

LS1

OpL

LS2

OpL

000motor off

not detectable

001clock-wise 0

detected

110counter

clock-wise

detected

101brake high 0

not detectable

010brake low

not detectable.

Door

Lock

OUT 1

OUT 2

HS1

LS1

HS2

LS2

Open Load

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