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STM32F427AI 数据表(PDF) 134 Page - STMicroelectronics |
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STM32F427AI 数据表(HTML) 134 Page - STMicroelectronics |
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134 / 240 page  Electrical characteristics STM32F427xx STM32F429xx 134/240 DS9405 Rev 12 Static latchup Two complementary static tests are required on six parts to assess the latchup performance: • A supply overvoltage is applied to each power supply pin • A current injection is applied to each input, output, and configurable I/O pin These tests are compliant with the EIA/JESD 78A IC latchup standard. 6.3.16 I/O current injection characteristics As a general rule, current injection to the I/O pins, due to external voltage below VSS or above VDD (for standard, 3 V-capable I/O pins) should be avoided during normal product operation. However, to give an indication of the robustness of the microcontroller in cases when abnormal injection accidentally happens, susceptibility tests are performed on a sample basis during device characterization. Functional susceptibility to I/O current injection While a simple application is executed on the device, the device is stressed by injecting current into the I/O pins programmed in floating input mode. While current is injected into the I/O pin, one at a time, the device is checked for functional failures. An out of range parameter indicates the failure: ADC error above a certain limit (>5 LSB TUE), out of conventional limits of induced leakage current on adjacent pins (out of – 5 µA/+0 µA range), or other functional failure (for example reset, oscillator frequency deviation). Negative induced leakage current is caused by negative injection and positive induced leakage current by positive injection. The test results are given in Table 56. Table 55. Electrical sensitivities Symbol Parameter Conditions Class LU Static latch-up class TA = +105 °C conforming to JESD78A II level A Table 56. I/O current injection susceptibility(1) Symbol Description Functional susceptibility Unit Negative injection Positive injection IINJ Injected current on BOOT0 pin − 0NA mA Injected current on NRST pin − 0NA Injected current on PA0, PA1, PA2, PA3, PA6, PA7, PB0, PC0, PC1, PC2, PC3, PC4, PC5, PH1, PH2, PH3, PH4, PH5 − 0NA Injected current on TTa pins: PA4 and PA5 − 0+5 Injected current on any other FT pin − 5NA 1. NA = not applicable . |
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