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MAX792MCPE Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX792MCPE Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 16 page Microprocessor and Non-Volatile Memory Supervisory Circuits 10 ______________________________________________________________________________________ Low-Line Output In internal threshold mode, the low-line comparator monitors VCC with a threshold voltage typically 120mV above the reset threshold, and with 15mV of hysteresis. For normal operation (VCC above the reset threshold), LOWLINE is pulled to VCC. Use LOWLINE to provide an NMI to the µP, as described in the previous section, when VCC begins to fall (Figure 4). Reset Function The MAX792/MAX820 provide both RESET and RESET outputs. The RESET and RESET outputs ensure that the µP powers up in a known state, and prevent code-exe- cution errors during power-up, power-down, or brownout conditions. The reset function will be asserted during the following conditions: 1) VCC less than the programmed reset threshold. 2) MR less than 1.30V typ. 3) Reset remains asserted for 200ms typ after VCC rises above the reset threshold or after MR has exceeded 1.30V typ. When reset is asserted, all the internal counters are reset, the watchdog output (WDO) and watchdog-pulse output (WDPO) are set high, and the set watchdog-time- out input (SWT) is set to (VCC - 0.6V) if it is not already connected to VCC (for internal timeouts). The chip- enable transmission gate is also disabled while reset is asserted; the chip-enable input (CE IN) becomes high impedance and the chip-enable output (CE OUT) is pulled up to VCC. MR RESET CE IN OV CE OUT 25 µs MIN 12 µs TYP 15 µs TYP Figure 2. Manual-Reset Timing Diagram MAX792 MAX820 MANUAL RESET OTHER RESET SOURCES 9 MR * * * . . . DIODES NOT REQUIRED ON OPEN-DRAIN OUTPUTS Figure 3. Diode "OR" connections allow multiple reset sources to connect to MR. MAX792 12 GND 3 VCC LLIN/REFOUT RESET RESET LOW LINE RESET IN/INT 4 5 2 10 1 TO µP TO µP TO µP NMI VIN Figure 4a. Connection for Internal Threshold Mode MAX792 GND VCC TO µP TO µP TO µP NMI 2 1 10 RESET IN/INT LLIN/REFOUT RESET RESET LOW LINE 12 VIN R3 = 1.30V x VCC MAX VLOW LINE x IMAX R2 = 1.30V x VCC MAX VRESET x IMAX – R3 R1 = VCC MAX IMAX – (R2 + R3) IMAX = THE MAXIMUM DESIRED CURRENT THROUGH THE VOLTAGE DIVIDED. 3 R3 R2 R1 Figure 4b. Connection for External Threshold Programming Mode |
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