L9680 datasheet(185/277 Pages) STMICROELECTRONICS

185 / 277 page

DocID029257 Rev 1

185/277

L9680

Remote sensor interface

276

9.3.2

Short to battery

All outputs are independently protected against a short to battery condition. Short to battery

protection disconnects the channel from its supply rail to guarantee that no adverse

condition occurs within the IC. The short-to-battery detection circuit has input offset voltage

(10mV, minimum) to prevent disconnecting of the output under an open circuit condition. A

short to battery is detected when the output RSUx pin voltage increases above SATBUCK

or SYNCBOOST (depending on operation) supply pin voltage for a TSTBTH time. An internal

up-counter will count in 1.5 μs increment up to TSTBTH. The counter will be cleared if the

short condition is not present for at least 1.5 μs. The channel in short to battery is not shut

down by this condition. Other channels are not affected in case of short of one output pin.

As in the case previously described, the STB fault code can be read from RSDR bits and

any fault will set the RSFLT bit of the global status word register (GSW). The STB bit is

cleared upon read or upon channel disabled via SPI RSCTRL register.

9.3.3

Cross link

The device provides also the capability of a cross link check between outputs, in order to

reveal conditions where two output channels are in short. This functionality is allowed by

enabling one output channel, while asking for voltage measurement on any of the other

ones.

9.3.4

Leakage to battery, sensor open

The sensor interface offers also open sensor detection. The auto-adjusting counter for

remote sensor current sensing will drop to 0 in case the current flowing through RSUx pin is

lower than 2.5 mA typ. The OPENDET fault flag is asserted when the fault condition lasts for

longer than TRSUOP_FILT deglitch filter time. This fault flag can be read from RSDR bits

and any fault will set the RSFLT bit of the global status word register (GSW). The channel in

this condition is not shutdown. This fault bit is cleared upon read or upon channel disabled

via SPI RSCTRL register.

9.3.5

Leakage to ground

The sensor interface offers as well the detection of a leakage to ground condition, that will

possibly raise the sensor current higher than 42 mA/12 mA typ in PSI5/WSS modes

respectively. The CURRENT_HI fault flag is asserted when the fault condition lasts for

longer than TRSUCH_FILT deglitch filter time. This fault flag can be read from RSDR bits and

any fault will set the RSFLT bit of the global status word register (GSW). The channel in this

condition is not shutdown. This fault bit is cleared upon read or upon channel disabled via

SPI RSCTRL register.

9.3.6

Thermal shutdown

Each output is protected by an independent over-temperature detection circuit should the

remote sensor interface thermal protection be triggered the output stage is disabled and a

corresponding thermal fault is latched and reported through the RSTEMP flag in the Remote

Sensor Data Register (RSDRx). The thermal fault flag is cleared when the sensor channel is

first disabled and then re-enabled through the Remote Sensor Configuration Register

(RSCRx).

L9680 Datasheet(PDF) 185 Page - STMicroelectronics

L9680 Datasheet(HTML) 185 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL