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L9965TS Datasheet(PDF) 20 Page - STMicroelectronics |
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L9965TS Datasheet(HTML) 20 Page - STMicroelectronics |
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20 / 62 page  Symbol Parameter Test conditions Min Typ Max Unit TCYCLIC_WAKEUP_TIMEOUT_111 Transceiver CYCLIC_WAKEUP timeout s GEN_CFG5.WAKEUP_CYCLIC_ TIMEOUT_LISTENER_SEL=111 14.40 16.00 17.60 TSELF_WAKEUP Self-wakeup latency From the assertion of a fault in CYCLIC_WAKEUP to the complete transition in NORMAL 2 ms TSPI_WAKEUP_TIMEOUT Timeout for receipt of wakeup frame 0.4 2 ms 5.2 Power supply section The VB pin is the main supply: • It feeds the 5V LDO (V5V) • It feeds the 3V3 Internal LDO (V3V3) • It is directly connected to WKP pin 5.2.1 VB battery supply 5.2.1.1 Diagnostic functions Table 10. Power supply diagnostics Fault type Assertion condition IC reaction to assertion Release condition Maskable VB UV VVB < VVB_UV_TH • VB_UV = 1 in GEN_STATUS1 • The FLT pin and the SPI FAULT are asserted in NORMAL if MSK_VB_UV=0 in GEN_CFG3 Clear on read if VVB > VVB_UV _TH + VVB_UV _HYS • VB_UV status bit non maskable • FLT pin and SPI FAULT maskable by bit MSK_VB_UV in GEN_CFG3 5.2.1.2 Electrical parameters Table 11. Power supply electrical parameters Symbol Parameter Test condition Min Typ Max Unit VVB_UV_TH VB Undervoltage Threshold Tested in production 4.75 5 5.25 V VVB_UV_HYS VB Undervoltage hysteresis Tested in production 85 185 mV TVB_UV_FIL VB Undervoltage filter time Tested by SCAN 20 µs 5.2.2 VIO output buffer supply This supply must be powered externally by a regulated 3.3V or 5V voltage (could be from MCU PMIC). It powers SDO, FLT, and BNE interface pins. 5.2.3 V3V3 internal LDO This is the internal 3.3V LDO: • It is fed by the VB main supply • It is used for supplying internal circuitry When in undervoltage, it determines the POR_MAIN assertion. The bit GEN_CFG5.POR_SLEEP_ASSERTED indicates that a transition to OFF state has occurred or that an oscillator stuck condition has been previously detected. At the first power-up, this bit is normally asserted. L9965T/L9965TS Functional description DS14987 - Rev 1 page 20/62 |
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