Adding Programmable Delay LP VRS Applications 1 Detectors
Adding Programmable Delay LP - VRS Applications 1
Detectors to Programmable Delay Supervisors • Add capacitor at each output to extend the delay – May require buffer depending on desired voltage threshold & output slew rate • Delay set by time required for output signal to charge capacitor to desired voltage threshold – Delay extends only for rising edge (returning from /RESET condition) – Delay for falling edge (/RESET assertion) remains unchanged 2
Operation without Delay 3
Operation with Delay: Example 1 (rising edge) • 0. 033 u. F in parallel with 47 u. F, the /RESET hits 200 ms on the rising edge at about 1 V – MCU or device connected to the /RESET would expect 1 V to be the voltage signifying the device is no longer in the reset condition 4
Operation with Delay: Example 2 (rising edge) • 0. 033 u. F in parallel with 10 u. F, the RESET hits 200 ms on the rising edge at about 2. 8 V – MCU or device connected to the /RESET would expect 2. 8 V to be the voltage signifying the device is no longer in the reset condition 5
Operation with Delay: ALL examples (falling edge) • Falling edge remains unchanged – Delay capacitors have no impact on falling edge – Device will go into reset condition as normal – Delay only observed when returning from a reset condition 6
- Slides: 6