h6006b3so8b EM Microelectronic, h6006b3so8b Datasheet

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h6006b3so8b

Manufacturer Part Number
h6006b3so8b
Description
Failsafe Watchdog
Manufacturer
EM Microelectronic
Datasheet
Description
The H6006 is a monolithic low power CMOS device
combining a programmable digital timer and a series of
voltage comparators on the same chip. The device is
specially convenient for Watch-Dog functions such as
microprocessor
watchdog part is designed to be used in all applications
where it is important that after the occurrence of a
malfunction the microprocessor system is stopped to avoid
further damage. The timeout warning signal ( TO ) can be
used to try to reactivate the system before halting it. The
voltage monitoring part provides double security by
combining both unregulated voltage and regulated voltage
monitoring simultaneously. The H6006 initializes the power-
on reset after V
V
signal for register saving and if the voltage drops further
below V
supply voltage down to 1.5 V and is therefore particularly
suited for start-up and shut-down control of microprocessor
systems
Typical Operating Configuration
Copyright © 2004, EM Microelectronic-Marin SA
IN
drops below V
Regulator
Voltage
RL
, RES goes active. The H6006 functions at any
R
IN
EM MICROELECTRONIC -
reached V
V
TCL
V
and
SL
IN
SS
, the H6006 gives an advanced warning
supply
SH
and V
SAVE
RES
voltage
V
TO
DD
DD
raises above 3.5 V. If
monitoring.
NMI
RES
Failsafe Watchdog
INT
I/O
processor
Micro-
5 V
Fig. 1
GND
The
1
Features
Y Failsafe watchdog function: timeout warning after 1st
Y Standard timeout period and power-on reset time
Y V
Y V
Y Internal voltage reference
Y Works down to 1.5 V supply voltage
Y Push-pull or Open drain outputs
Y Low current consumption
Y Available for normal and extended temperature range
Y SO8 package
Applications
Y Microprocessor and microcontroller systems
Y Point of sales equipment
Y Telecom products
Y Automotive subsystems
Pin Assignment
MARIN SA
timeout period, reset after 2nd timeout period, reset
remains active to avoid further failures
(10 ms), externally programmable if required
voltages for: power-on reset initialization, advanced
power-fail warning ( SAVE ), reset at power-down ( RES )
only if V
IN
DD
TCL
monitoring with 3 standard or programmable trigger
V
RC
V
monitoring: power-on reset initialization enabled
SS
IN
DD
SO8
t 3.5 V
H6006
www.emmicroelectronic.com
H6006
V
TO
SAVE
RES
DD
Fig. 2

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h6006b3so8b Summary of contents

Page 1

... IN DD TCL TO SAVE RES V SS Copyright © 2004, EM Microelectronic-Marin SA MARIN SA Failsafe Watchdog Features Y Failsafe watchdog function: timeout warning after 1st timeout period, reset after 2nd timeout period, reset remains active to avoid further failures Y Standard timeout period and power-on reset time monitoring. ...

Page 2

... Threshold ratio Copyright © 2004, EM Microelectronic-Marin SA Unless otherwise specified, proper operation can only occur when all terminal voltages are kept within the supply voltage -0 range. Unused inputs must always be tied to a defined logic -0.3 voltage level. +0.3 ...

Page 3

... SAVE RES Power-on Timer Reset Start Copyright © 2004, EM Microelectronic-Marin SA Test Conditions Excluding debounce time T DB Load 100 pF = open, unshielded , open, unshielded (not tested) monitoring enabled Timer Power-on Timer ...

Page 4

... SAVE T TO RES TCL Power-on Reset Timeout Block Diagram Copyright © 2004, EM Microelectronic-Marin Timer Timer Reset Reset RES Timer Reset Timeout Timeout V IN Band-Gap Reference Save SAVE Control Reset ...

Page 5

... Short circuits on the regulated supply voltage can ON be detected. Voltage Thresholds The H6006 is available with 3 different sets of thresholds : Copyright © 2004, EM Microelectronic-Marin SA Version B1: with internal voltage divider, resulting in thresholds for direct monitoring of the unregulated voltage without external components. > Voltage ...

Page 6

... RD Microprocessor Copyright © 2004, EM Microelectronic-Marin SA Timer Clearing and RES Action DD A negative edge or a negative pulse at the TCL input longer than 150 ns will reset the timer and set TO high further TCL signal edge or pulse is applied before T ...

Page 7

... DD External Programming of RC Oscillator TCL RES increases T TO Note: using both external components R1 and C1 allows to achieve tighter timeout period tolerances. Copyright © 2004, EM Microelectronic-Marin SA 2 TCL 330 Monitoring and Power-On Reset TCL monitoring and watchdog function not used ...

Page 8

... H6006B2SO8B H6006B3SO8A B3 1.95 H6006B3SO8B * = non stock item. Might be available on request and upon minimum order quantity (please contact EM Microelectronic). Note: Other versions are no longer available EM Microelectronic-Marin SA cannot assume responsibility for use of any circuitry described other than circuitry entirely embodied Microelectronic-Marin SA product. EM Microelectronic-Marin SA reserves the right to change the circuitry and specifications without notice at any time ...

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