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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L9945 датащи(PDF) 120 Page - STMicroelectronics |
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L9945 датащи(HTML) 120 Page - STMicroelectronics |
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120 / 151 page  Figure 25. BIST & HWSC sequence GADG2011171331PS POR •HWSC_DONE = 0 •HWSC_DIS = 1 •BIST_DONE = 0 •BIST_DIS = 1 BIST •HWSC_DONE = 0 •HWSC_DIS = 1 •BIST_DONE = 0 •BIST_DIS = 1 HWSC •HWSC_DONE = 0 •HWSC_DIS = 1 •BIST_DONE = 1 •BIST_DIS = X END •HWSC_DONE = 1 •HWSC_DIS = X •BIST_DONE = 1 •BIST_DIS = X BIST_RQ = 01 N_POR 1 0 NRES 1 0 Table 32. HWSC timing characteristics Symbol Parameter Min. Max. Unit tHWSC_DUR HWSC duration time 100 160 µs 6.1.4 VPS undervoltage In case VPS is lower than VVPS_UV for tVPS_react + tLBD_FIL, a battery undervoltage is detected, all outputs are actively turned off and the VPS_LATCH is set high (cleared on SPI readout). The undervoltage comparator output can be monitored by reading VPS_STATE bit via SPI. Outputs are re-engaged when undervoltage condition disappears. Table 33. VPS UV detection electrical characteristics Symbol Parameter Min. Max. Unit VVPS_UV VPS low battery detection threshold 3.5 3.8 V tVPS_react VPS Comparator output reaction time for L->H and H->L transition 100 700 ns tLBD_FIL Filter time for VPS low battery detection 0.5 5 µs 6.1.5 Charge pump undervoltage In case VGBHI is lower than VCP_UV for tCP_UV, a charge pump undervoltage is detected, all outputs are actively turned off and the VCP_UV_LATCH is set high (cleared on SPI readout). The undervoltage comparator output can be monitored by reading VCP_UV_STATE bit via SPI. Outputs are re-engaged when undervoltage condition disappears. L9945 Disable sources DS12275 - Rev 8 page 120/151 |
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