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L9945 Datasheet(PDF) 130 Page - STMicroelectronics |
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L9945 Datasheet(HTML) 130 Page - STMicroelectronics |
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130 / 144 page  Figure 39. Fast charge/discharge currents for OL detection: (left) OL detection on LS; (right) OL detection on HS Vout Settling counter t t LS OFF Diagnostics VLVT VOL tDIAG LS ON t Fast charge VOUT_OL LS OFF (no OL) LS ON LS OFF (OL) OL Vout Settling counter t t HS OFF Diagnostics VLVT VOL tDIAG HS ON t Fast discharge VOUT_OL HS OFF (no OL) HS ON HS OFF (OL) OL GADG1303171134PS The table below reports the electrical characteristics of the fast charge/discharge current generators. Table 48. Fast charge/discharge current generator electrical characteristics Symbol Parameter Min. Max. Unit IFAST_CHG Vout node fast charge current used in case of LS NMOS 2.4 3.8 mA IFAST_DIS_P Vout node fast discharge current used in case of HS PMOS 8 13 mA IFAST_DIS_N Vout node fast discharge current used in case of HS NMOS 9 15 mA Note: Vout corresponds to DRNx pin for LS NMOS and HS PMOS configurations, while it is SNGPx pin for HS NMOS configuration. 6.5 Silent diagnostic pulses for static loads The device features ON/OFF diagnostic pulses of fixed duration for monitoring channels that are in a steady state. Two type of pulses are available: • OFF pulse: turns off the selected channel for a tPULSE_OFF interval. To be used for OL and STG/STB detection. It is effective only if Tdiag < 100 µs. • ON pulse: turns on the selected channel for a tPULSE_ON interval. To be used for OC detection. It is effective only if Tblank_oc < 80 µs. Once a diagnostic pulse is over, the output control is released and channel can be driven either by NONx pins or SPI (as programmed). Diagnostic pulses can be sent by programming the DIAG_ON_PULSE_xx and DIAG_OFF_PULSE_xx bit in the COMMAND 9 frame. Pulse requests are latched and are reset once pulse execution is completed. For each channel: • A diagnostic pulse request must not be sent until the previous one is completed. If a pulse request incomes when pulse latches are still set, it will be ignored. L9945 Safety & diagnostics DS12275 - Rev 10 page 130/144 |
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