TLE8108EM Infineon Technologies, TLE8108EM Datasheet - Page 19

• Manufacturer Part Number: TLE8108EM
• Manufacturer: Infineon Technologies

Specifications of TLE8108EM

• Packages: PG-SSOP-24
• Thermal Class: Exposed Pad
• Id Nom: 8 x 0.5 A
• Pin Count: 24.0 Pins
• Channels: 8.0
• Comment: 8 channel realy and LED driver

Failure Mode
Overtemperature
Overload
(Short Circuit to battery)
If, when the output stage is on, a SCB is detected the device turns the output stage off and the output stage can
not be turned on again unless Clear mode is entered for the corresponding channel.
It could happen that when the SCB is detected another failure has already been stored in the corresponding
register (OL or SCG); In this case the previous failure information, if not already been read, is lost.
If SCB is stored in the corresponding register and the output detects an OL or SCG, this OL or SCG will not be
stored until the previous SCB has been cleared by entering Clear Mode (CLR). In order to detect OL or SCG then,
an active OFF command needs to be adressed or, while a low input value is set on the dedicated input, input mode
has to be programmed. The final OL or SCG diagnosis information can be obtained when the next SPI command
is transmitted.
After power on sequence, the device must be programmed into Standby Mode, that means all channels in Clear
mode, to have proper diagnosis information afterwards.
7.1
In order to detect the failures in OFF status, there are 2 thresholds (
regulating mechanism with 2 diagnosis currents with current limits for each output.
In OFF state, the internal mechanism tends to regulate the output to the middle value between
achieving it only in case of OL. In case of SCG the output is pulled to GND by the short-circuit. In case of normal
function, in OFF state, the output voltage is above
The diagnosis currents are switched off in case the output is in CLR mode.
The OL, SCB, SCG and DOT fault conditions are not stored until an integrated filter time has expired
Data Sheet
Diagnosis Characteristics
Comment
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•
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In OFF state without clamping an Overtemperature will not be recognized. The
channel can be switched on after the event vanishes without any diagnosis entry.
In OFF state when the output voltage is limited to the clamping voltage, an
Overtemperature event will be recognized immediately at occurrence. Switching the
channel(s) on is possible when the Overtemperature and the clamping events
disappear and the dedicated channel(s) is (are) programmed to Clear mode.
In ON state when overtemperature occurs, the corresponding failure is stored into
the diagnosis register and the affected channel(s) is(are) switched off. To switch the
channel on again, the overtemperature event must disappear and the dedicated
channel(s) must be programmed to Clear mode
Diagnosis in ON state when the dedicated channel(s) is (are) programmed to ON
mode or input mode with input H. When Overload is detected, the affected
channel(s) is (are) switched off after time
latched into the diagnosis register. To switch the channel(s) ON again, the Overload
event must disappear and the dedicated channel(s) must be programmed to Clear
mode.
V
DS(OL)
19
V
Smart 8-Channel Low Side Switch
t
DS(SCG)
OFF(OVL)
and
and the corresponding failure is
V
DS(OL)
) and an internal voltage
Rev. 1.0, 2011-03-23
Diagnosis Features
V
DS(SCG)
TLE 8108 EM
and
V
DS(OL)