Datasheet

Application Note 14 2015-02-11
Revision 1.0
ISO2H823V2.5 Evaluation Board
Board Manual
Functional Description
Figure 12 Diagnostics Overview
Global Diagnostics
The global diagnostics include:
• UV: undervoltage supply condition when VBB is below 16 V with 0.5 V hysteresis,
• MV : missing voltage supply condition when VBB is below 13 V with 0.5 V hysteresis,
• OTP: global over temperature (chip temperature outside the switch area triggers above 125°C), the global over
temperature does not lead to thermal shutdown,
• ALLOFF: all drivers in the power chip are disabled (by DRIVE-programming, ODIS
-setting or temperature
shutdown of all channels),
• LAMP: the load of one of the drivers behaves like a cold lamp
Diagnostics Overview ISO2H823V.vsd
Output Driver Control Unit
OUTx
Current Limitation
Temperature Sensor
Zener Clamping
(Demag. of Induct. Loads)
Protection Unit
OLADJ
IADJ
Diagnostic
Unit
Short to V
BB
Detection
Open Load Active Detection
Overload Detection
Open Load Inactive Detection
Over Temperature Detection
SCV
OLA
OCL
OLI
OT
V
BB
Monitoring
Driver
DIAGx
Filtering &
Processing
CF
UV
MV
COLDIAG
GLERR
Missing Voltage Detection
Under Voltage Detection
Reset Voltage
V
BB
DIAGCFG