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UM1556 Datasheet(PDF) 2 Page - STMicroelectronics |
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UM1556 Datasheet(HTML) 2 Page - STMicroelectronics |
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2 / 87 page ![]() Contents UM1556 2/87 Doc ID 023520 Rev 2 Contents 1 General items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.1 Application schematic (monolithic digital, monolithic and hybrid analogue HSD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.2 Reverse battery protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.2.1 Reverse battery protection of monolithic HSDs . . . . . . . . . . . . . . . . . . . . 9 1.2.2 Reverse battery protection of hybrid HSDs . . . . . . . . . . . . . . . . . . . . . . 15 1.3 Microcontroller protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 1.4 Introduction of M0-5Enhanced products . . . . . . . . . . . . . . . . . . . . . . . . . 17 1.4.1 New features overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 1.4.2 Open load in off-state/short to Vbat . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 1.4.3 Indication of power limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 1.4.4 Indication of power limitation – example for analogue driver . . . . . . . . . 19 1.4.5 Indication of power limitation – example for digital driver . . . . . . . . . . . 20 1.4.6 M0-5Enhanced: analogue current sense truth table . . . . . . . . . . . . . . . 21 1.4.7 Indication of power limitation, the advantages . . . . . . . . . . . . . . . . . . . . 22 2 Analogue current sense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 2.2 Simplified principle of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 2.3 Normal operation (channel ON, CS_DIS low) . . . . . . . . . . . . . . . . . . . . . 24 2.4 Overtemperature indication (channel ON, CS_DIS low) . . . . . . . . . . . . . 27 2.5 Current sense ESD and spikes protection . . . . . . . . . . . . . . . . . . . . . . . . 27 2.6 Current sense resistor calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 2.7 Diagnostics with different load configurations . . . . . . . . . . . . . . . . . . . . . 29 2.7.1 Diagnostics with paralleled loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 2.7.2 Diagnostics with different load options . . . . . . . . . . . . . . . . . . . . . . . . . 29 2.7.3 K-factor calibration method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 2.8 Analogue current sense diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 2.9 Open load detection in off-state – external circuitry for analogue M0-5 HSD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 2.10 Open Load detection in off-state – M0-5Enhanced HSD . . . . . . . . . . . . . 36 3 Digital status output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 |
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