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L9965P Datasheet(PDF) 25 Page - STMicroelectronics |
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L9965P Datasheet(HTML) 25 Page - STMicroelectronics |
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25 / 104 page  3.6 Pyro-fuse deployment stage The Figure 10 shows the pyro-fuse deployment stage architecture. Figure 10. Pyro-fuse deployment stage architecture FENx_EN FENx_MODE FENx_LEVEL FENx_FREQ SPI_CMD_HS SPI_CMD_LS FENH FENL PS PF PR PGND RPYRO DELAY FENx_DLY_CFG HS_RET_CFG HS_RET_DLY_CFG FIRE_GOOD I_DEPLOY_CFG T_DEPLOY_CFG FENH & FENL Analog Filters FENH & FENL DECODERS CONTROL DRIVER FIRE_GOOD_SEL FIRE_INHIBIT FENx_DEGLITCH FENx_FAULT_PERIOD SPI DECODER FIRE_END FIRE_END_BY_FAULT Two independent paths are implemented to drive the HS and LS output switches: • One via hardware through FENH and FENL pins. • One via software through two SPI commands. Three substages are present: • Signal stage – The FENH and FENL signals decoders are configured via SPI registers and their configuration is stored into NVM. – A delay stage on the FENx path enables fine-tuning of the trigger output propagation delay for applications where several L9965P pyro-fuse drivers need to be phase-shifted. – A parallel decoder stage for SPI arming commands is available. • Control driver – The control driver translates the signal stage outputs into suitable commands for the power-stage output domain. • Power stage – The LS and HS are turned on by a latch whose reset occurs whenever the fire attempt ends successfully or the deploy timer expires. – A HS current sensing is implemented to deploy the pyro-fuse with the programmed current profile and manage the deployment autoretry. – The power stage is inhibited by a “fire inhibit” signal in case a fault occurs. L9965P Functional description DS14702 - Rev 4 page 25/104 |
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