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AD5100EVAL Datasheet(PDF) 12 Page - Analog Devices |
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AD5100EVAL Datasheet(HTML) 12 Page - Analog Devices |
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12 / 32 page  AD5100 Preliminary Technical Data Rev. PrJ | Page 12 of 32 When the V1MON input drops below the programmed UV threshold, the comparator will become active immediately, indicating a UV condition has occurred. Similarly due to hysteresis, the V1MON input must be brought above the programmed UV threshold by 1.5% before the comparator will be in-active, indicating the UV condition has gone away. Both V1mon comparators are used (in conjunction with hold and delay timers) to control the SHDN and RESET pins. V1MON exhibits typical input resistance of 60KΩ that users should account the loading effect. The default V1MON OV and UV thresholds are 18.00V and 8.43V respectively. The default V1MON Shutdown Hold time and Shutdown Delay are 200ms and 1200ms respectively. User should refer to Tables 5b and 6b if they want to program different settings. V 1MON V 1MON_OV V 1MON_UV Hysteresis Hysteresis OV Comparator Active OV Comparator In-Active UV Comparator Active UV Comparator In-Active V 1MON V 1MON_OV V 1MON_UV Hysteresis Hysteresis OV Comparator Active OV Comparator In-Active UV Comparator Active UV Comparator In-Active Figure 6. V1MON Hysteresis. V2MON V2MON is a high-voltage monitoring input that controls the SHDN and RESET functions of the external devices. V2MON monitors inputs from 3V to 30V. It has a 16-level programmable Turn-on, Turn-off (ON,OFF) hysteresis threshold with an 8-step 0.05ms-200ms shutdown hold time and 0.05ms-1200ms shutdown delay. By default, V2MON is level-sensitive that the ON and OFF thresholds are both monitored. The ON threshold chosen must be greater than the OFF threshold. When the shutdown function is triggered by the input reaching V2MON_OFF threshold, such fault condition will be temporarily recorded in the Fault Detection Register. The SHDNWARN output will transition low for signaling before shutdown occurs. The occurance of shutdown is depending on how long the shutdown programmed-delay is set relative to the SHDNWARN propagation delay, this feature attempts to allow the system to finish any critical house keeping tasks before shuting down the external device. The V2MON, shutdown, and shutdown warning pins timing diagrams are also shown in Figure 5. The ranges of ON and OFF Thresholds are shown in Tables 5a and the programming codes of the selected- thresholds are found in Table 5b. The defaulted ON threshold is 7.47V and OFF threshold is 6.95V. Simarily, the ranges of shutdown hold and delay times are shown in Table 6a and the programming codes of the selected-timings are found in Table 6b. The defaulted shutdown hold time is 10ms and delay time is 100ms. V2MON_OFF will be ignored if V2MON_OFF > V2MON_ON but V2MON_OFF cannot be = V2MON_ON. If the V2MON is selected with Rising Edge Triggered, only the ON threshold is monitored and the OFF Threshold is ignored. The voltage at V1MON provides the power for the AD5100 but valid signal at V2MON must be present before the internal VREG starts operation. Details will be explained in the power section. The V2MON pin is monitored by 2 comparators, 1 for turn-on, and 1 for turn-off detection in the level sensitive power-up mode. Both are designed with 1.5% hysteresis. On the other hand, the turn-on monitoring comparator is used only if the rising edge trigger power-up mode is selected. When the V2MON input goes above the programmed Ton threshold, the comparator will become active immediately, indicating an OV condition has occurred. Due to hysteresis, the V2MON input must be brought below the programmed threshold by 1.5% before the comparator will be in-active, indicating the OV condition has gone away, see Figure 7. When the V2MON input drops below the programmed threshold, the comparator will become active immediately, indicating a UV condition has occurred. Similarly due to hysteresis, the V2MON input must be brought above the programmed threshold by 1.5% before the comparator will be in-active, indicating the UV condition has gone away. V2MON V 2MON_ON V 2MON_OFF Hysteresis Hysteresis ON Comparator Active ON Comparator In-Active OFF Comparator Active OFF Comparator In-Active V2MON V 2MON_ON V 2MON_OFF Hysteresis Hysteresis ON Comparator Active ON Comparator In-Active OFF Comparator Active OFF Comparator In-Active Figure 7. V2MON Hysteresis. V2MON exhibits typical input resistance of 60KΩ that users should account the loading effect. The default V2MON ON and OFF thresholds are 7.47V and 6.95V respectively. The default V2MON Shutdown Hold time and Shutdown Delay are 10ms and 100ms respectively. User should refer to Tables 5b and 6b if they want to program different settings. |
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