TDA6230GP Datasheet, PDF (9/16 Pages) Infineon Technologies AG – Smart Octal Low-Side Switch Overtemperature Protection

Data Sheet TLE 6230 GP
high level at this pin (within the data byte) will switch on the power switch, provided that the
corresponding parallel input is also switched on (AND-operation for channel 1 to 4).
SO - Serial Output. Diagnostic data bits are shifted out serially at this pin, the most significant
bit first. SO is in a high impedance state until the CS pin goes to a logic low state. New diag-
nostic data will appear at the SO pin following the rising edge of SCLK.
RESET - Reset pin. If the reset pin is in a logic low state, it clears the SPI shift register and
switches all outputs OFF. An internal pull-up structure is provided on chip.
Diagnostics
FAULT - Fault pin. There is a general fault pin (open drain) which shows a high to low transi-
tion as soon as an error occurs for any one of the eight channels. This fault indication can be
used to generate a µC interrupt. Therefore a ‘diagnosis’ interrupt routine need only be called
after this fault indication. This saves processor time compared to a cyclic reading of the SO
information.
As soon as a fault occurs, the fault information is latched into the diagnosis register. A new
error will over-write the old error report. Serial data out pin (SO) is in a high impedance state
when CS is high. If CS receives a LOW signal, all diagnosis bits can be shifted out serially.
The rising edge of CS will reset all error registers.
Diagnostic Serial Data Out SO
15 14 13 12 11 10 9 8 - - - - -
Ch.8 Ch.7 Ch.6 Ch.5
HH
Normal function
HL
Overload, Shorted Load or Overtemperature
LH
Open Load
LL
Shorted to Ground
Figure 1: Two bits per channel diagnostic feedback
There are two diagnostic bits per channel configured as shown in Figure 1.
Normal function: The bit combination HH indicates that there is no fault condition, i.e. normal
function.
Overload, Short Circuit to Battery (SCB) or Overtemperature: HL is set when the current
limitation gets active, i.e. there is a overload, short to supply or overtemperature condition.
Open load: An open load condition is detected when the drain voltage decreases below 3 V
(typ.). LH bit combination is set.
Short Circuit to GND: If a drain to ground short circuit exists and the drain to ground current
exceeds 100 µA, short to ground is detected and the LL bit combination is set.
V2.3
Page 9
18. Nov. 2009