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STM813L Datasheet(PDF) 10 Page - STMicroelectronics |
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STM813L Datasheet(HTML) 10 Page - STMicroelectronics |
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10 / 27 page  STM705/706/707/708/813L 10/27 Ensuring a Valid Reset Output Down to VCC =0V When VCC falls below 1V, the state of the RST out- put can no longer be guaranteed, and becomes essentially an open circuit. If a high value pull- down resistor is added to the RST pin, the output will be held low during this condition. A resistor val- ue of approximately 100k Ω will be large enough to not load the output under operating conditions, but still sufficient to pull RST to ground during this low voltage condition (see Figure 11). Figure 11. Reset Output Valid to Ground Circuit Interfacing to Microprocessors with Bi- directional Reset Pins Microprocessors with bi-directional reset pins can contend with the STM705-708 reset output. For example, if the reset output is driven high and the micro wants to pull it low, signal contention will re- sult. To prevent this from occurring, connect a 4.7k Ω resistor between the reset output and the micro’s reset I/O as in Figure 12. Figure 12. Interfacing to Microprocessors with Bi-directional Reset I/O AI08835 STMXXX RST R1 AI08836 STMXXX RST GND 4.7k VCC Microprocessor RST Buffered Reset to other System Components GND VCC |
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