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U6813B Datasheet(PDF) 4 Page - ATMEL Corporation |
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U6813B Datasheet(HTML) 4 Page - ATMEL Corporation |
4 / 16 page 4 4543B–AUTO–10/05 U6813B 3. Fail-safe Functions A fail-safe IC has to maintain its monitoring function even if there is a fault condition at one of the pins (e.g., short circuit), ensuring that a microcontroller system does not reach a “critical status”. A critical status means, for example, if the system is not able to switch off the relay or disable the power MOSFET, or if the system is not able to provide a signal to the microcontroller via ENABLE- and RESET-outputs in the case of a fault condition. The U6813B is designed to han- dle those fault conditions according to Table 3-1 for a maximum of system safety. Notes: 1. default state at open input 2. P-EN disable: low 3. N-EN disable: high 4. Watchdog Description Figure 4-1. Watchdog Block Diagram The microcontroller is monitored by a digital window watchdog which accepts an incoming trig- ger signal of a constant frequency for correct operation. The frequency of the trigger signal can be varied in a broad range as the watchdog’s time window is determined by external R/C com- ponents. The following description refers to the watchdog timing diagram with tolerances (see Figure 4-2 on page 5). Table 3-1. Truth Table VCC 3.3V WDI RELI FETI RELO FETO N-RES P-RES P-EN(2) N-EN(3) ok ok ok H x on x H L H L ok ok ok L(1) x off x H L H L ok ok ok x H x on H L H L ok ok ok x L (1) x off HLHL ok ok wrong x x off off H L L H x wrong x x x off off L H L H wrong x x x x off off L H L H Slope detector Up/down counter Dual MUX Binary counter RS-FF WDC WDI RESET OSCERR WD-OK |
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