 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
AD5100 Datasheet(PDF) 13 Page - Analog Devices |
|
||||||||||||||||||||||||||||||
AD5100 Datasheet(HTML) 13 Page - Analog Devices |
|
|
13 / 36 page  AD5100 Rev. 0 | Page 13 of 36 MONITORING INPUTS V1MON V1MON is a high voltage monitoring input that controls the SHDN and RESET functions of the external devices. In addition, it provides a shutdown warning to the system. V1MON monitors inputs from 6 V to 30 V. The V1MON pin is monitored by two comparators, one for overvol- tage and one for undervoltage detection. Both are designed with 1.5% hysteresis. When the V1MON input goes above the programmed overvoltage (OV) threshold, the comparator becomes active immediately, indicating that an OV condition has occurred. Due to hysteresis, the V1MON input must be brought below the programmed OV threshold by 1.5% before the comparator becomes inactive, indicating that the OV condition has gone away (see Figure 6). V1MON V1MON_UV OV COMPARATOR ACTIVE OV COMPARATOR INACTIVE UV COMPARATOR ACTIVE UV COMPARATOR INACTIVE V1MON_OV HYSTERESIS HYSTERESIS Figure 6. V1MON Hysteresis When the V1MON input drops below the programmed under- voltage (UV) threshold, the comparator becomes active immediately, indicating that 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 becomes inactive, indicating that 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 has a 16-level programmable OV threshold (Register 0x01) and UV threshold (Register 0x02) with an 8-step 0.07 ms to 200 ms shutdown hold time (t1SD_HOLD) and 0.07 ms to 1200 ms shutdown delay (t1SD_DELAY). The shutdown hold time means that the SHDN signal is held low for t1SD_HOLD after V1MON returns within its UV and OV thresholds. The shutdown delay means that the SHDN signal activation is delayed until the programmed t1SD_DELAY has elapsed. SHDN activates once the voltage on V1MON is outside the OV or UV threshold for a time longer than tGLITCH. RESET follows SHDN delay and hold timings when triggered by VIMON. The OV threshold chosen must be greater than the UV threshold. When the shutdown is triggered, either because the input has reached the OV or UV threshold, such fault conditions are temporarily recorded in the fault detection register. The SHDNWARN output transitions low for signaling before the shutdown output, SHDN, activates. The timing of the SHDN output is dependent on how long the shutdown- programmed delay (t1SD_DELAY ) is set relative to the SHDNWARN propagation delay (tFD_DELAY). This feature attempts to allow the system to finish any critical housekeeping tasks before shutting down the external device. The V1MON, shutdown, and shutdown warning timing diagrams are shown in Figure 7. The ranges of OV and UV thresholds are shown in Table 6, and the programming codes for the selected thresholds are found in Table 7. The defaulted OV threshold is 18.00 V and, for UV threshold, it is 8.43 V. Similarly, the ranges of shutdown hold and delay times are shown in Table 8, and the programming codes for the selected timings are shown in Table 9. The default shutdown hold time is 200 ms; for shutdown delay time, it is 1200 ms. V1MON exhibits typical input resistance of 55 kΩ that users should take into account for loading effect. The voltage at V1MON provides the power for the AD5100, but a valid signal on V2MON must be present before the internal power rail, VREG, starts operation. Details are explained in the Power Requirements section. |
Similar Part No. - AD5100_08 |
|
Similar Description - AD5100_08 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
