R
EM MICROELECTRONIC -
MARIN SA
H6060
Self Recovering Watchdog
Description
The H6060 is a monolithic low-power CMOS device
combining a programmable timer and a series of voltage
comparators on the same chip. The device is specially
suited for watchdog functions such as microprocessor and
supply voltage monitoring. If the
µP
system malfunctions,
the watchdog will recover it by issuing repeated active
reset signals. The voltage monitoring part provides double
security by combining both the unregulated voltage (V
IN
)
and
the
regulated
voltage
(V
DD
)
monitoring
simultaneously. The H6060 initializes the power-on reset
after V
IN
reaches V
SH
(see table 4) and V
DD
rises above
3.V. If V
IN
drops below V
SL
(see table 4), the H6060 gives
an advanced warning signal for register saving and if the
voltage drops further below V
RL
(see table 4), RES and
RES
go active. The H6060 functions at any supply
voltage down to 1.6 V and is therefore particularly suited
for start-up and shut-down control of microprocessor
systems.
Features
Self recovering watchdog function: reset goes active
after the 1st timeout period, reset goes inactive again
after the 2nd timeout period, repeated active reset
signal until the system recovers
Standard timeout period and power-on reset time (100
ms), externally programmable if required
Unregulated DC monitoring (V
IN
) with 3 standard or
programmable trigger voltages for: power-on reset
initialization, advanced power-fail warning (
SAVE
),
reset at power-down (
RES
)
Regulated DC monitoring (V
DD
): power-on reset
initialization enabled only if V
DD
≥
3.5 V
Internal voltage reference
Works down to 1.6 V supply voltage
Push-pull or Open drain outputs
Low current consumption
SO8 package
Applications
Microprocessor and microcontroller systems
Point of sales equipment
Telecom products
Automotive subsystems
Typical Operating Configuration
Pin Assignment
H6060
Fig. 1
Fig. 2
Copyright © 2004, EM Microelectronic-Marin SA
1
www.emmicroelectronic.com
EMMICRO [ EM MICROELECTRONIC - MARIN SA ]
