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MAX6459UTC-T Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX6459UTC-T Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 15 page MAX6457–MAX6460 High-Voltage, Low-Current Voltage Monitors in SOT Packages 11 Maxim Integrated remains high. When VCC exceeds VTRIPHIGH, OUTB asserts low while OUTA remains high. VTRIPLOW and VTRIPHIGH are given by the following equations: where RTOTAL = R1 + R2 + R3. Use the following steps to determine the values for R1, R2, and R3. 1) Choose a value for RTOTAL, the sum of R1, R2, and R3. Because the MAX6458/MAX6459 have very high input impedance, RTOTAL can be up to 5MΩ. 2) Calculate R3 based on RTOTAL and the desired upper trip point: 3) Calculate R2 based on RTOTAL, R3, and the desired lower trip point: 4) Calculate R1 based on RTOTAL, R3, and R2: R1 = RTOTAL - R2 - R3 Example Calculations for Window Detection The following is an example for calculating R1, R2, and R3 of Figure 11 for window detection. Select the upper and lower trip points (VTRIPHIGH and VTRIPLOW). VCC = 21V VTRIPHIGH = 23.1V VTRIPLOW = 18.9V For 5% hysteresis, VTH+ = 1.228 and VTH- = 1.167. 1) Choose RTOTAL = 4.2MΩ = R1 + R2 + R3 2) Calculate R3 3) Calculate R2 R VR V VM V k TH TOTAL TRIPHIGH 3 1 228 4 2 23 1 223 273 = × = Ω =Ω + (. ) ( . ) . . R VR V R TH TOTAL TRIPLOW 23 = × - - R VR V TH TOTAL TRIPHIGH 3 = × + VV R RR VV R R TRIPLOW TH TOTAL TRIPHIGH TH TOTAL = + ⎛ ⎝⎜ ⎞ ⎠⎟ = ⎛ ⎝⎜ ⎞ ⎠⎟ + - 23 3 MAX6457– MAX6460 VMON VCC VCC R1 R2 GND RPULLUP IN+ OUT (OUTA FOR MAX6459) OUT (OUTA) Figure 12. Monitoring Voltages Other than VCC MAX6457– MAX6460 VCC GND RPULLUP OUT/ OUTA/ OUTB OUT/ OUTA/ OUTB VCC (4V TO 28V) VOUT (UP TO 28V) Figure 13. Interfacing to Voltages Other than VCC MAX6460 VCC VCC R1 R2 GND VNEG RPULLUP IN+ REF IN- OUT OUT Figure 14. Monitoring Negative Voltages |
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