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STM6503VAAADG6F Datasheet(PDF) 11 Page - STMicroelectronics |
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STM6503VAAADG6F Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 29 page STM6502, STM6503, STM6504, STM6505 Description Doc ID 16101 Rev 5 11/29 1.2.5 Edge-triggered Smart Reset input (SRE pin) – STM6504 only The SRE pin is active-high, immediate and independent reset input that includes an edge trigger with debounce delay tDEBOUNCE on the falling edge. Note: The triggering edge must be a high-to-low or low-to-high transition with a slew-rate faster than 1 V/µs typ. Figure 8. STM6504 timing 1.2.6 Adjustable delay of Smart Reset input (SRC pin) – STM6502 and STM6505 only This pin controls the setup time before the push-button action is validated by the reset output. It is connected to an external capacitor (CSRC), which is tied to ground to provide the desired value of the setup time (tSRC). Calculated tSRC and CSRC examples are given in Table 3. Refer also to Table 6. AM00328V2 tREC SR0 t < tSRC => no output response tSRC t < tDEBOUNCE => tREC timer reset Independent RST SRE No debounce tREC tDEBOUNCE (rising edges within tDEBOUNCE are ignored) tREC Table 3. tSRC programmed by an ideal external capacitor – STM6502 and STM6505 Calculated CSRC value [µF] Setup delay tSRC [s] (1)(2) 1. At 25 °C. Example calculations based on an ideal capacitor. During application design and component selection it should be considered that the current flowing into the external tSRC programming capacitor (CSRC) is on the order of 100 nA, therefore a low-leakage capacitor (ceramic or film capacitor) should be used and placed as close as possible to the SRC pin. Also an adequate low-leakage PCB environment should be ensured to prevent tSRC accuracy from being affected. A recommended minimum value of CSRC is 0.01 µF. 2. In case of repeated activations of the tSRC timer, an interval of 10 ms min. is needed between the activations to fully discharge CSRC, so that the next tSRC is as specified. Closest common CSRC value [µF] Min. Typ. Max. 0.2 2 2.5 3.0 0.22 0.3 3 3.75 4.5 0.33 0.6 6 7.5 9 0.56 1 10 12.5 15 1 |
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