TLE82453-3SA_15 Datasheet, PDF (41/71 Pages) Infineon Technologies AG – 3 Channel High-Side and Low-Side Linear Solenoid Driver IC

Load
State
NORMAL LOAD
OPEN LOAD or SWITCH BYPASS
NORMAL LOAD
TLE82453-3SA
Diagnosis Functions
ILOADx
VLOADx
OLSBx
Tolsb_on
CSN
SI
SO
FAULTN
(FMx = 1)
DIAG-
NOSIS
DIAG-
NOSIS
OLOFFx
=0
DIAG- DIAG-
NOSIS NOSIS
DIAG-
NOSIS
OLOFFx
=1
Set-point
>0
Figure 21 OLSB Fault - On State Timing Diagram (High-Side Configuration)
Load
State
NORMAL LOAD
OPEN LOAD or SWITCH BYPASS
NORMAL LOAD
ILOADx
VLOADx
OLSBx
Tolsb_on
CSN
SI
SO
FAULTN
(FMx = 1)
DIAG-
NOSIS
DIAG-
NOSIS
OLSBx
=0
DIAG- DIAG-
NOSIS NOSIS
DIAG-
NOSIS
OLSBx
=1
Set-point
>0
Figure 22 OLSB Fault - On State Timing Diagram (Low-Side Configuration)
The device detects an open load / switch bypass fault when the channel is turned off by applying a weak current
source to the LOADx pin and comparing the LOADx pin voltage to VLSUPx/2. A pull up current source or a pull
down current sink can be activated by setting the IDIAGx Select field of the CONFIGURATION register. The
programmed current source is automatically enabled when the setpoint is set to 0 and the EN bit in the setpoint
register is set to 1. It is disabled when the setpoint is set to a value greater than 0 or the EN bit is set to 0. A
simplified block diagram of the OLOFF detection circuit when the channel is disabled is shown in Figure 23. The
OLOFF fault bit is never latched. The fault bit will be cleared when the fault is no longer present.
When the channel is disabled and an OLOFF fault is detected, it is possible to discriminate between an open load
fault and a switch bypass fault by changing the IDIAG current source. For a high-side configured channel, the pull
Data Sheet
-
41
Rev 1.0, 2015-03-27