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SGM802 Datasheet(PDF) 8 Page - SG Micro Corp |
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SGM802 Datasheet(HTML) 8 Page - SG Micro Corp |
8 / 12 page Low-Power, SC70/SOT µP Reset Circuit with SGM802 Capacitor-Adjustable Reset Timeout Delay 8 SG Micro Corp www.sg-micro.com APPLICATION INFORMATION Negative-Going VCC Transients In addition to issuing a reset to the µP during power-up, power-down, and brownout conditions, this supervisor is relatively immune to short-duration negative-going transients (glitches). The graph Maximum Transient Duration vs. Reset Threshold Overdrive in the Typical Performance Characteristics shows this relationship. The area below the curve of the graph is the region in which these devices typically do not generate a reset pulse. This graph was generated using a negative-going pulse applied to VCC, starting above the actual reset threshold (VTH) and ending below it by the magnitude indicated (reset-threshold overdrive). As the magnitude of the transient decreases (further below the reset threshold), the maximum allowable pulse width- decreases. Typically, a VCC transient that goes 100mV below the reset threshold and lasts 50µs or less does not cause a reset pulse to be issued. Ensuring a Valid RESET Down to VCC = 0 When VCC falls below 1V, RESET current-sinking (sourcing) capabilities decline drastically. For applications using the SGM802, a 100kΩ pull up resistor between RESET and VCC holds RESET high when VCC falls below 1V (Figure 2). RESET VCC VCC GND SGM802 100k Ω Figure 2. Ensuring RESET Valid to VCC = 0 Layout Consideration SRT is a precise current source. When developing the layout for the application, be careful to minimize board capacitance and leakage currents around this pin. Traces connected to SRT should be kept as short as possible. Traces carrying high-speed digital signals and traces with large voltage potentials should be routed as far from SRT as possible. Leakage current and stray capacitance (e.g., a scope probe) at this pin could cause errors in the reset timeout period. When evaluating these parts, use clean prototype boards to ensure accurate reset periods. |
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