DS1707ESA datasheet(2/10 Pages) MAXIM

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DS1707/DS1708

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The third function the DS1707/DS1708 performs is pushbutton reset control. The DS1707/DS1708

debounces the pushbutton input and guarantees an active reset pulse width of 130 ms minimum.

OPERATION

Power Monitor

The DS1707/DS1708 detects out-of-tolerance power supply conditions and warns a processor-based

system of impending power failure. When VCC falls below the minimum VCC tolerance, a comparator

outputs the RST and RST signals. RST and RST are excellent control signals for a microprocessor, as

processing is stopped at the last possible moment of valid VCC. On power-up, RST and RST are kept

active for a minimum of 130 ms to allow the power supply and processor to stabilize.

Pushbutton Reset

The DS1707/DS1708 provides an input pin for direct connection to a pushbutton reset (see Figure 2). The

pushbutton reset input requires an active low signal. Internally, this input is debounced and timed such

that RST and RST signals of at least 130 ms minimum will be generated. The 130 ms delay commences

as the pushbutton reset input is released from the low level. The pushbutton can be initiated by connecting

the NMI output to the PBRST input as shown in Figure 3.

Non-Maskable Interrupt

The DS1707/DS1708 generates a non-maskable interrupt ( NMI ) for early warning of a power failure. A

precision comparator monitors the voltage level at the IN pin relative to an on-chip reference generated

by an internal band gap. The IN pin is a high impedance input allowing for a user-defined sense point. An

external resistor voltage divider network (Figure 5) is used to interface with high voltage signals. This

sense point may be derived from a regulated supply or from a higher DC voltage level closer to the main

system power input. Since the IN trip point VTP is 1.25 volts, the proper values for R1 and R2 can be

determined by the equation as shown in Figure 5. Proper operation of the DS1707/DS1708 requires that

the voltage at the IN pin be limited to VCC. Therefore, the maximum allowable voltage at the supply being

monitored (VMAX) can also be derived as shown in Figure 5. A simple approach to solving the equation is

to select a value for R2 high enough to keep power consumption low, and solve for R1. The flexibility of

the IN input pin allows for detection of power loss at the earliest point in a power supply system,

maximizing the amount of time for system shut-down between NMI and RST/ RST .

When the supply being monitored decays to the voltage sense point, the DS1707/DS1708 pulses the NMI

output to the active state for a minimum 200

ms. The NMI power-fail detection circuitry also has built-in

hysteresis of 100

mV. The supply must be below the voltage sense point for approximately 5 ms before a

low NMI will be generated. In this way, power supply noise is removed from the monitoring function,

preventing false interrupts. During a power-up, any detected IN pin levels below VTP by the comparator

are disabled from generating an interrupt until VCC rises to VCCTP. As a result, any potential NMI pulse

will not be initiated until VCC reaches VCCTP.

Connecting NMI to PBRST would allow the non-maskable interrupt to generate an automatic reset when

an out-of-tolerance condition occurred in a monitored supply. An example is shown in Figure 3.

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