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L9680 Datasheet(PDF) 169 Page - STMicroelectronics |
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L9680 Datasheet(HTML) 169 Page - STMicroelectronics |
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169 / 286 page  DS11615 Rev 7 169/286 L9680 Deployment drivers 285 Figure 34. Deployment loop diagnostics The leakage diagnostic includes short to battery, short to ground and shorts between loops. The test is applied to each SFx and SRx pin so shorts can be detected regardless of the resistance between the squib/pyroswitch pins. 8.5.1 Low level diagnostic approach In this approach, each of the test steps described in the sections below requires user intervention by issuing the proper SPI command. High voltage leakage test for oxide isolation check This test is mandatory to address possible leakages that could not be experienced at low voltages on SFx or SRx pins. The Isource current generator (ISRC) is enabled on the chosen SFx pin. To confirm that the SFx pin has then reached a suitable voltage level, a dedicated ADC measurement on the SFx pin can be requested. Once this test is performed, a leakage test on SFx and SRx pins can be issued to double check possible leakages. Leakage to battery/ground diagnostics Prior to the real test, the Voltage Regulator Current Monitor block (VRCM) has to be tested and validated. The validation of VRCM goes into verifying both the short to battery and short to ground flags. The Isource current generator (ISRC) is first connected to SFx pin to raise its voltage to SYNCBOOST. Then, the Voltage Regulator Current Monitor block (VRCM) is enabled and SSxy SFx SRx SGx 22nF 1nF 22nF Ilimit =70mA 8/40 mA + - Gain = 5.25 Voffset + - A to D 10bit Tot err = ±4LSB LSB = 2.5/1024 V HV analog MUX Vref =2v5 Vref =2v5 Short to GND Rleak >10K no detection Rleak <1K detection Short to BAT Rleak >10K no detection Rleak <1K detection Squib resistor LOW Squib resistor HIGH VRCM (voltage regulator current monitor) Squib resistance measure (system error < 8%) Rsquib 1 to 10 Vout Vgnd or VBat RLeak RLeak EMI low pass filter Squib loop driver and diagnostic blocks xN 3v3 supply SYNCBOOST ISRC VER pin (from Energy Reserve ) Safing transistor SATBUCK Vgnd or VBat Bypass ISINK Ipulldown I=1mA GNDA ISRC_CURR_SEL GAPGPS02280 |
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