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MAX6412UK26-T Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX6412UK26-T Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page Use the following formula to calculate the externally monitored voltage (VMON_TH): VMON_TH = VRST ✕ (R1 + R2)/R2 where VMON_TH is the desired reset threshold voltage and VRST is the reset input threshold (1.26V). Resistors R1 and R2 can have very high values to minimize cur- rent consumption due to low leakage currents. Set R2 to some conveniently high value (1M Ω, for example) and calculate R1 based on the desired monitored volt- age, using the following formula: R1 = R2 x (VMON_TH/VRST - 1) ( Ω) Manual Reset Input (MAX6412/MAX6413/MAX6414) Many µP based products require manual reset capabil- ity, allowing the operator, a technician, or external logic circuitry to initiate a reset. A logic low on MR asserts reset. Reset remains asserted while MR is low and for the reset timeout period after MR returns high. The MR has an internal 20k Ω pullup resistor so it can be left open if not used. Connect a normally open momentary switch from MR to ground to create a man- ual reset function (external debounce circuitry is not required for long reset timeout periods). A manual reset option can easily be implemented with the MAX6415–MAX6420 by connecting a normally open momentary switch in parallel with R2 (Figure 2). When the switch is closed, the voltage on RESET IN goes to zero, initiating a reset. Similar to the MAX6412/MAX6413/ MAX6414 manual reset, reset remains asserted while the switch is closed and for the reset timeout period after the switch is opened. Monitoring Voltages Other than VCC (MAX6415/MAX6416/MAX6417) The MAX6415/MAX6416/MAX6417 contain an adjustable reset threshold input. These devices can be used to monitor voltages other than VCC. Calculate VMON_TH as shown in the Reset Threshold section. (See Figure 3.) Low-Power, Single/Dual-Voltage µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay 6 _______________________________________________________________________________________ MAX6415 MAX6416 MAX6417 SRT GND RESET IN VCC R1 VMON_TH VMON_TH = 1.26 x (R1 + R2) / R2 R2 Figure 1. Calculating the Monitored Threshold Voltage (VMON_TH) MAX6415– MAX6420 SRT GND RESET IN VCC R1 VCC R2 Figure 2. Adding an External Manual Reset Function to the MAX6415–MAX6420 MAX6415 MAX6416 MAX6417 SRT GND RESET IN VCC VCC R1 VMON_TH R2 Figure 3. Monitoring External Voltages |
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