BTS 5590G Infineon Technologies, BTS 5590G Datasheet - Page 27

• Manufacturer Part Number: BTS 5590G
• Manufacturer: Infineon Technologies

Specifications of BTS 5590G

• Packages: PG-DSO-36
• Channels: 5.0
• Channel Mix: 2*25mohm+1*40mohm+2*100mohm
• Led Mode: Yes
• Cranking Mode: No
• Pwm Engine Integrated: No

8.1
The standard diagnosis at the SPI interface provides information about each channel. The error flags, an OR
combination of the over temperature flags and the over load monitoring signals are provided in the SPI standard
diagnosis bits ERRn.
The over load monitoring signals are latched in the error flags and cleared each time the standard diagnosis is
transmitted via SPI. In detail, they are cleared between the second and third raising edge of the SCLK signal.
The over temperature flags, which cause an overheated channel to stay switched off, are latched directly at the
gate control block. The latches are cleared by SPI command HWCR.CTL.
Please note:
The over temperature information is latched twice. When transmitting a clear thermal latch command (HWCR.CLT),
the error flag is cleared during command transmission of the next SPI frame and ready for latching after the third
raising edge of the SCLK signal. As a result, the first standard diagnosis information after a CTL command will
indicate a failure mode at the previously affected channels although the thermal latches have been cleared
already. In case of continuous over load, the error flags are set again immediately because of the over load
monitoring signal.
In case of high duty cyle (off state of output < t
the power Mosfet. The over load monitoring signals might be set and latched in the error flags. See Application
Note “Software Strategy for Diagnosis during PWM-Operation“ for more details.
8.2
There is a current sense signal available at pin IS which provides a current proportional to the load current of one
selected channel. The selection is done by a multiplexer which is configured via SPI.
The current sense signal (ratio k
adjusted to the load type (LED or bulb) via SPI register WDLR for channels 0 to 2. Usually a resistor R
connected from the current sense pin to GND. It is recommended to use resistors 2.5 kΩ < R
value is 3.3 kΩ.
Figure 14
1) The curves show the behavior based on characterization data. The marked points are guaranteed in this Data Sheet in
Data Sheet
Section 8.4
Diagnosis Word at SPI
Load Current Sense Diagnosis
Current Sense Ratio k
(Position 8.4.1).
6000
5000
4000
3000
2000
1000
0
0.5
ILIS
=
ILIS
I
1
L
/
Channel 0,1
I
S
1.5
) is provided as long as no failure mode occurs. The ratio k
off-state_min
2
2.5
1)
27
) the V
I
L0,1
3
/A
DS
3.5
might not be equal to V
4
4.5
dummy
bulb: T
dummy
bulb: T
dummy
led: T
dummy
led: T
5
j
j
= 150 C
= -40 C
j
j
= 150 C
= -40 C
5.5
DD
SPOC - BTS5590G
6
during the off state of
Rev. 1.3, 2007-10-30
IS
< 7 kΩ. A typical
Diagnosis
ILIS
can be
IS
is