BTS6480SF datasheet(46/73 Pages) INFINEON

46 / 73 page

Data Sheet

Rev. 1.0, 2010-04-12

SPOC - BTS6480SF

Diagnosis

For diagnosis feedback at different operation modes, please see following table.

9.1

Diagnosis Word at SPI

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 latch off, are latched directly at the gate control

block. The over current flags, which cause an channel 0 or 1 driving a too high current to switch off, are latched

like the over temperature flags. Those latches are cleared by SPI command HWCR.CL.

Please note: The over temperature and over current information is latched twice. When transmitting a clear latch

command (HWCR.CL), 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

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.

9.2

Load Current Sense Diagnosis

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.

Table 6

Operation Modes 1)

1) L = low level, H = high level, Z = high impedance, potential depends on leakage currents and external circuit x = undefined

Operation Mode

Input Level

OUT.OUTn

Output

Level VOUT

Current

Sense IIS

Error Flag

ERRn

2) The error flags are latched until they are transmitted in the standard diagnosis word via SPI

SBM

DCR.SBM

Normal Operation (OFF)

L / 0

(OFF-state)

GND

Short Circuit to GND

GND

Thermal shut down

Short Circuit to VBB

VBB

Open Load

03)

3) If the current sense multiplexer is set to Channel 0 to 3 and DRC.CSOL bit set

Inverse Current

> VBB

04)

4) If the current sense multiplexer is set to Channel 0 to 3

Normal Operation (ON)

H / 1

(ON-state)

VBB

IL / kILIS

Short Circuit to GND

~ GND

Dynamic Temperature Sensor shut down

Over Current shut down

15)

5) The over current latch off flag is set latched and can be cleared by SPI command HWCR.CL

Thermal shut down

16)

6) The over temperature flag is set latched and can be cleared by SPI command HWCR.CL

Short Circuit to VBB

VBB

< IL / kILIS

Open Load

VBB

Inverse Current

> VBB

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