TLE75242-ESD datasheet(46/71 Pages) INFINEON

Numer części	TLE75242-ESD

Szczegółowy opis	SPIDER 12V SPI Driver for Enhanced Relay Control

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Datasheet

46

Rev. 1.0

2017-11-23

TLE75242-ESD

SPIDER+ 12V

Diagnosis

9

Diagnosis

The SPI of TLE75242-ESD provides diagnosis information about the device and the load status. Each channel

diagnosis information is independent from other channels. An error condition on one channel has no

influence on the diagnostic of other channels in the device (unless configured to work in parallel, see

Chapter 7.3 for more details).

9.1

Over Load and Over Temperature

When either an Over Load or an Over Temperature occurs on one channel, the diagnosis bit ERRn is set

accordingly. As described in Chapter 8.1 and Chapter 8.2, the channel latches OFF and must be reactivated

setting corresponding HWCR_OCL.OUTn bit to “1”.

9.2

Output Status Monitor

The device compares each channel VDS with VDS(OL) (Low-Side channels and auto-configurable channels used

as Low-Side switches), VOUT_S with VOUT_S(OL) (auto-configurable channels used as High-Side), VOUT with VOUT(OL)

(High-Side channels) and sets the corresponding DIAG_OSM.OUTn bits accordingly. The bits are updated

every time DIAG_OSM register is read.

• VDS < VDS(OL) → DIAG_OSM.OUTn = “1” (Low-Side channels and auto-configurable channels as Low-Side)

• VOUT_S > VOUT_S(OL) → DIAG_OSM.OUTn = “1” (auto-configurable channels as High-Side)

• VOUT > VOUT(OL) → DIAG_OSM.OUTn = “1” (High-Side channels)

A diagnosis current IOL in parallel to the power switch can be enabled by programming the DIAG_IOL.OUTn

bit, which can be used for Open Load at OFF detection. Each channel has its dedicated diagnosis current

source. If the diagnosis current IOL is enabled or if the channel changes state (ON → OFF or OFF → ON) it is

necessary to wait a time tOSM for a reliable diagnosis. Enabling IOL current sources increases the current

consumption of the device. Even if an Open Load is detected, the channel is not latched OFF.

See Figure 23 for a timing overview (the values of DIAG_IOL.OUTn refer to a channel in normal operation

properly connected to the load).

Figure 23 Output Status Monitor timing

INn

t

OutStatMon_timings.emf

OUT.OUTn

1

t

tON + tOSM

DIAG_OSM.OUTn

0

t

x

t

SPI readout of

DIAG_OSM.OUTn

1

0

Output voltage

comparator

tOFF + tOSM

x

0

x

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