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L9963E 数据表(PDF) 149 Page - STMicroelectronics |
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L9963E 数据表(HTML) 149 Page - STMicroelectronics |
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149 / 184 page  6.9.2 Differential measurement In the single ended approach the external NTC is connected between two PCB global inputs. This eliminates the issue of GND shift but requires an additional global pin for each NTC. Using two GPIOs to measure the NTC voltage is not mandatory, but simplifies the calculations. Figure 45. Example of NTC differential measurement L9963E VTREF GPIO4 RPU CFIL RFIL RNTC GPIO5 RFIL RPD AGND CESD CESD Table 84. NTC analog front end BOM for differential measurement Components Value Unit Max. tolerance Rating Comments RNTC 10 kΩ 1% Recommended external NTC typical value @25 °C. The NTCALUG02A103F is a good option for evaluation purposes RFIL 3.3 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 4πRFILCFIL. 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% 16 V Protect against ESD events and ISO spikes. Filter the NTC signal: cut-off frequency is fC= 1 2πRFILCFIL.Connectto AGND. L9963E NTC analog front end DS13636 - Rev 12 page 149/184 |
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