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MAX8212ETY Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX8212ETY Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 7 page Calculate resistor values for Figure 3 as follows: 1) Choose a value for R1. Typical values are in the 10k Ωto 10MΩrange. 2) Calculate R2 for the desired upper trip point VU using the formula: 3) Calculate R3 for the desired amount of hysteresis, where VL is the lower trip point: or, if V+ = VIN: Figure 5 shows an alternate circuit, suitable only when the voltage being detected is also the power-supply voltage for the MAX8211 or MAX8212. Calculate resistor values for Figure 5 as follows: 1) Choose a value for R1. Typical values are in the 10k Ωto 10MΩrange. 2) Calculate R2: 3) Calculate R3: Low-Voltage Detector for Logic Supply The circuit of Figure 5 will detect when a 5.0V (nominal) supply goes below 4.5V, which is the VMIN normally specified in logic systems. The selected resistor values ensure that false undervoltage alarms will not be gener- ated, even with worst-case threshold trip values and resistor tolerances. R3 provides approximately 75mV of hysteresis. R3 R1 (VU VL) 1.15V =× − R2 R1 (VL VTH) VTH R1 (VL 1.15V) 1.15V =× − =× − R3 R2 (VL VTH) (VU VL) R2 (VL 1.15V) (VU VL) =× − − =× − − R3 R2 (V VTH) (VU VL) R2 (V + 1.15V) (VU VL) =× +− − =× − − R2 = R1 (VU VTH) VTH R1 (VU 1.15V) 1.15V × − =× − Microprocessor Voltage Monitors with Programmable Voltage Detection ________________________________________________________________________________________ 5 -55 TA ( °C) 1.250 1.230 1.210 1.190 1.170 1.150 1.130 1.110 1.090 1.070 1.050 -25 25 75 125 V+ = 16.5V V+ = 2V Figure 4. MAX8211/MAX8212 Threshold Trip Voltage vs. Ambient Temperature VIN HYST MAX8211 OUT GND V+ R3 48.7k Ω 1% R2 2.2M Ω 1% R1 750k Ω 1% VOUT (LOW FOR VIN < 4.5V) THRESH Figure 5. MAX8211 Logic-Supply Low-Voltage Detector |
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