MIC706P View Datasheet(PDF) - Micrel

Part Name

Description

Manufacturer

MIC706P

µP Supervisory Circuit

Micrel 

MIC706P/R/S/T, MIC708R/S/T

Applications Information

Power Fail Warning

An additional comparator which is independent of the other

functions on the MIC706P/R/S/T is provided for early warning

of power failure. An external voltage divider can be used to

compare unregulated DC to an internal 1.25V reference. The

voltage divider ratio on the input of the power-fail comparator

(PFI) can be chosen so as to trip the power fail comparator a

few milliseconds before VCC falls below the maximum reset

threshold voltage. The output of the power-fail comparator

(/PFO) can be used to interrupt the microprocessor when

used in this mode and execute shut-down procedures prior

to power loss. Hysteresis can be added to this comparator

with external resistors, as is commonly done with any com-

parator. When VCC < VBATT - 1.2V (typ.), the power-fail

comparator is turned off and /PFO is pulled low in order to

conserve power.

Unregulated DC

R1

PFI

+

PFO

1.25V

-

R2

Micrel, Inc.

Watchdog Timer

The microprocessor can be monitored by connecting the

WDI pin (watchdog input) to a bus line or an I/O line. If a

transition doesn't occur on the WDI pin with in the watchdog

timeout (Table 1.), the microprocessor is reset. /RESET will

remain asserted for 200ms when this occurs. A minimum

pulse of 100ns or any transition low-to-high or high-to-low

on the WDI pin will reset the watchdog timer. The output of

the watchdog timer (WDO) will remain high, if WDI sees a

valid transition within the watchdog period or if VCC falls

below the reset threshold as the watchdog timer is disabled

when this happens.

Microprocessor Reset

The /RESET pin is asserted whenever VCC falls below the

reset threshold voltage. The reset pin remains asserted for a

period of 200ms after VCC has risen above the reset thresh-

old voltage. The reset timeout period can also be selected

by the end user, see Table 1. The reset function ensures the

microprocessor is properly reset and powers up into a known

condition after a power failure. /RESET will remain valid with

VCC as low as 1.4V and when auxiliary power is connected

to VBATT (VBATT > 2.0V), the reset pin will remain valid with

VCC from 0V to 5.5V.

Figure 1. Power Fail Comparator

MIC706P/R/S/T, MIC708R/S/T

6

January 2006

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