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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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L9965TS Datenblatt(PDF) 25 Page - STMicroelectronics |
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L9965TS Datenblatt(HTML) 25 Page - STMicroelectronics |
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25 / 62 page  • In CYCLIC_COUNT it is used to feed the CYCLIC_WAKEUP timer • In NORMAL it is used for clock monitoring functionality.A high frequency oscillator operates at fMAIN_ OSC and it is active in NORMAL and CYCLIC_WAKEUP states 5.6.1 Diagnostic functions When in NORMAL or in CYCLIC_WAKEUP state, the two oscillators monitor each-other to ensure that the frequency is in the allowed range. If the oscillator frequency is not in the correct operating range, the power up and down transitions and related timing may be affected. Any frequency drift can be detected by the oscillator monitor. The oscillator monitor is covered, for latent fault detection, by BIST at each transition from low power states to NORMAL and CYCLIC_WAKEUP modes. Table 21. Oscillator Monitor diagnostics Fault type Assertion condition IC reaction to assertion Release condition Maskable OSC FAIL |fOSCI_SLEEP - fMAIN_OSC /32| > fOSC_MON_ERR • OSC_FAIL = 1 in GEN_STATUS1 • The FLT pin and the SPI FAULT is asserted in NORMAL if MSK_OSC_FAIL =0 in GEN_CFG3 Clear on read • MSK_OSC_FAIL status bit non maskable • FLT pin and SPI FAULT maskable by bit MSK_OSC_FAIL in GEN_CFG3 OSC STUCK TOSC_STUCK > TOSCI_STUCK_TIMEOUT • The device moves in DEEPSLEEP state • POR_SLEEP_ASSERTED =1 in GEN_CFG5 • Device configurations are restored to default values - Non maskable OSC MON BIST During transition to NORMAL and CYCLIC_WAKEUP, if oscillator monitor logic check fails • BIST_OSC_FAIL=1 in GEN_STATUS3 • The FLT pin and the SPI FAULT is asserted in NORMAL if MSK_BIST_OSC_FAIL=0 in GEN_CFG3 Clear on read(1) • BIST_OSC_FAIL status bit non maskable • FLT pin and SPI FAULT maskable by bit MSK_BIST_OSC_FAIL in GEN_CFG3 1. This flag must be checked at least 12 ms after the power-up. 5.6.2 Electrical parameters Table 22. V5V electrical parameters Symbol Parameter Test conditions Min Typ Max Unit fOSCI_SLEEP Stand-by oscillator frequency Tested in production -8% 500 +8% kHz fMAIN_OSC Oscillator frequency Tested in production -5% 16 +5% MHz fOSC_MON_ERR Oscillator delta frequency threshold Guaranteed by SCAN 25 36 % TOSCI_STUCK_TIMEOUT Oscillator stuck detection timeout Guaranteed by SCAN 2 ms 5.7 Communication interfaces The L9965T/TS implements two communication interfaces allowing BMS microcontroller access to internal registers and interaction with all the L9965x chained devices: • SPI Target, described in Section 5.7.1: used by the controller MCU to access the L9965T/TS device. • Isolated Vertical Interface (VIF), described in Section 5.7.2: used by L9965T/TS device to communicate with the L9965x devices connected in daisy chain on the VIF bus. L9965T/L9965TS Functional description DS14987 - Rev 1 page 25/62 |
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