SPI Driver for Enhanced Relay Control

SPIDER - TLE7243SL

Diagnosis Features

Datasheet

18

Rev. 1.0, 2009-09-30

7

Diagnosis Features

The SPI of SPIDER - TLE7243SL provides diagnosis information about the device and about the load. There are

following diagnosis flags implemented:

The diagnosis information of the protective functions of channel n is latched in the diagnosis flag Dn.

The open load diagnosis of channel n is latched in the diagnosis flag OLn.

Both flags are cleared by programming the specific channel to Standby (STB).

7.1

Diagnosis Characteristics

Note: Characteristics show the deviation of parameter at given supply voltage and junction temperature. Typical

values show the typical parameters expected from manufacturing.

Failure Mode

Comment

Open Load or short circuit

to ground

Diagnosis, when channel n is switched on: none

Diagnosis, when channel n is switched off: according to voltage level at the output pin, flag OLn

is set after time

t

When the channel is in OFF there is Diagnosis active, in Standby the Diagnosis is not enabled

Over Temperature

When over temperature occurs, the according diagnosis flag Dn is set. If the affected channel n

was active it is switched off.

The diagnosis flags are latched until they have been cleared by programming the channel STB.

Over Load

(Short Circuit)

and the dedicated diagnosis flag Dn is set.

The diagnosis flags are latched until they have been cleared by programming the channel STB

Electrical Characteristics: Diagnosis

All voltages with respect to ground, positive current flowing into pin

unless otherwise specified:

V

Pos.

Parameter

Symbol

Limit Values

Unit

Conditions

Min.

Typ.

Max.

OFF State Diagnosis

7.1.1

Open load detection threshold

voltage

V

DS(OL)

1.0

2.5

V

7.1.2

Output pull-down diagnosis current

per channel

I

D(PD)

80

μA

V

7.1.3

Open load diagnosis delay time

t

d(OL)

30

200

μs

ON State Diagnosis

7.1.4

Over load detection current

I

D(OVL)

0.5

0.95

A

7.1.5

Over load detection delay time

t

OFF(OVL)

350

μs