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MAX8216MJD Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX8216MJD Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 12 page ±5V, ±12V (±15V) Dedicated Microprocessor Voltage Monitors _______________________________________________________________________________________ 9 absolute maximum ratings have no effect on the refer- ence. Within the absolute maximum ratings, the DIN input has no effect on the reference. Power-Supply Bypassing and Grounding In high-noise environments where the voltage connected to VDD may change abruptly, the reference voltage may “bounce,” causing false comparator outputs. Eliminate this problem using Figure 8’s RC bypass network. Although bypassing the reference may appear to help, Figure 8’s solution is recommended; bypassing the ref- erence reduces its voltage change, but doing so caus- es a time delay prior to the reference voltage returning to its correct level. Eliminating Output Oscillation when Using the Auxiliary Comparator Although hysteresis is built into the auxiliary comparator, output oscillation problems are still possible. Oscillation can occur when a comparator’s output couples back to its inverting input through stray board capacitance. Make sure the board trace leading from the comparator output does not pass near its inverting input (or vice versa). Also, reducing the resistance connected to DIN reduces its susceptibility to picking up output signals. In most cases, using input resistor values on the order of 100k Ω creates no problem. Since using lower resistor values increases the supply current, another approach is to bypass the input resistors as shown in Figure 9, although this slows the circuit’s response. When much larger valued input resistors are used, high valued resis- tors on the output should be used. When DOUT is required to sink larger currents (i.e., when smaller pull-up resistor values are used), oscilla- tion problems are more likely to occur. To minimize power consumption and to optimize stability, use the largest value pull-up resistor feasible for the output drive required. When lower pull-up resistor values are used, lower values for the resistors connected to the inputs can help alleviate oscillation problems. MAX8215 MAX8216 14 VDD 8 PGND 0.1 µF OUT1 DOUT 7 13 9 RESET 3 2 +VS GND +5V DIN +5V 680k 680k 1 µF 1k Figure 7. Microprocessor Reset Circuit Monitoring Its Own Supply Voltage MAX8215 MAX8216 13 OUT1 14 VDD V+ 1k 0.1 µF Figure 8. Alternate Bypass Scheme MAX8215 MAX8216 9 DOUT 7 DIN VIN Figure 9. Alternative Means for Reducing Impedance Level Seen at DIN |
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