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ST7LITE1 数据表(PDF) 111 Page - STMicroelectronics |
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ST7LITE1 数据表(HTML) 111 Page - STMicroelectronics |
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111 / 131 page  ST7LITE1 111/131 CONTROL PIN CHARACTERISTICS (Cont’d) Figure 82. RESET pin protection when LVD is enabled.1)2)3)4)5) Figure 83. RESET pin protection when LVD is disabled.1)2)3) 1. The reset network protects the device against parasitic resets. 2. The output of the external reset circuit must have an open-drain output to drive the ST7 reset pad. Otherwise the device can be damaged when the ST7 generates an internal reset (LVD or watchdog). 3. Whatever the reset source is (internal or external), the user must ensure that the level on the RESET pin can go below the VIL max. level specified in section 13.9.1 on page 110. Otherwise the reset will not be taken into account internally. 4. Because the reset circuit is designed to allow the internal RESET to be output in the RESET pin, the user must ensure that the current sunk on the RESET pin (by an external pull-up for example) is less than the absolute maximum value specified for IINJ(RESET) in section 13.2.2 on page 92. 5. When the LVD is enabled, it is mandatory not to to connect a pull-up resistor and a capacitor to VDD on the RESET pin. 0.01 µF ST72XXX PULSE GENERATOR Filter RON VDD WATCHDOG LVD RESET INTERNAL RESET RESET EXTERNAL Recommended 0.01 µF VDD 0.01 µF EXTERNAL RESET CIRCUIT USER VDD 4.7k Ω Required Recommended ST72XXX PULSE GENERATOR Filter RON VDD WATCHDOG INTERNAL RESET |
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