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L9963E 数据表(PDF) 147 Page - STMicroelectronics |
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L9963E 数据表(HTML) 147 Page - STMicroelectronics |
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147 / 184 page  Components Value Unit Max. tolerance Rating Comments RISO 6.8 Ω 10% 1/10 W Resistor for limiting inrush current during hotplug 6.9 NTC analog front end 6.9.1 Single ended measurement In the single ended approach the external NTC is connected between PCB global input and battery pack GND. This strategy requires only a single PCB global pin for each external NTC. However, even if L9963E AGND is connected to pack GND at PCB level, measurement precision could be affected by shifts between the two grounds, which can be seen as a VTREF variation. In order to increase measurement precision, connection of the NTC to AGND through an additional PCB connector or Differential Measurement can be exploited. Figure 43. Example of NTC single ended measurement L9963E VTREF GPIO4 RPU CFIL RFIL RNTC AGND PACK GND Table 83. NTC analog front end BOM for single ended measurement Components Value Unit Max. tolerance Rating Comments RNTC 10 kΩ 1% Recommended external NTC typical value. The NTCALUG02A103F is a good option for evaluation purposes RFIL 3.9 kΩ 10% 1.5 W Protect the GPIO in case of external STG/STB. Limit the ESD inrush current. Filter the NTC signal: cut-off frequency is fC= 1 2πRFILCFIL. Do not use thin film resistors on these lines connected to ECU global pins. They could drift upon System Level ESD strikes. Use thick film or metal foil instead. CFIL 100 nF 10% 100 V Protect against ESD events and ISO spikes. Filter the NTC signal: cut-off frequency is fC= 1 2πRFILCFIL.Connectto AGND RPU 10 kΩ 1% 0.5 W Provide VTREF/2 polarization for NTC typical value. Protect VTREF pin in case of external short to battery/GND. L9963E NTC analog front end DS13636 - Rev 12 page 147/184 |
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