H6060 EMMICRO [EM Microelectronic - MARIN SA], H6060 Datasheet - Page 5

• Manufacturer Part Number: H6060
• Description: Self Recovering Watchdog
• Manufacturer: EMMICRO [EM Microelectronic - MARIN SA]

Pin Description
Functional Description
Supply Lines
The circuit is powered through the V
monitors both its own V
the V
V
During power-up the V
RES and SAVE stay active low as long as V
V
state of the outputs depend on the watchdog timer and
the voltage at V
the supply voltage V
the watchdog timer and the V
and the outputs RES , RES and SAVE become active.
The V
V
The analog voltage comparators compare the voltage
applied to V
voltage regulator) with the stabilized supply voltage V
(version 14) or with the bandgap voltage (versions 15, 16)
(see Fig. 7). At power-up, when V
reaches the V
and the timer starts running, setting RES and RES in
active after the time T
, the SAVE output goes active and stays active until V
rises again above V
will stop. When V
initiate a power-up sequence. The RES and RES outputs
may however be influenced independently of the voltage
V
and Timer Action”. Monitoring the rough DC side of the
regulator, as shown in Fig. 11, is the only way to have
advanced warning of power-down. Spikes on V
be filtered if they are likely to exceed the value (V
V
The combination of V
system security: if V
the device starts the power-on sequence only when V
reached V
supply voltage can be detected.
Voltage Thresholds on V
The
thresholds:
Copyright © 2004, EM Microelectronic-Marin SA
RES and RES will become active and the on-chip timer
Pin Name
1
2
3
4
5
6
7
8
DD
ON
IN
IN
RL
).
Monitoring
by the timer action, see section ″Combined Voltage
Monitoring
(3.5 V). As soon as V
IN
V
RC
V
RES
V
DD
TCL
RES
SAVE
IN
SS
DD
H6060
input.
line should be free of voltage spikes.
ON
IN
R
(Fig. 10). Short circuits on the regulated
SH
Function
Voltage sense input
Timer clear input signal
RC oscillator tuning input
GND terminal
Active low reset output
Save output
Active high reset output
Positive supply voltage terminal
IN
(typically connected to the input of the
is available with 3 different sets of
level, the SAVE output goes inactive,
relative to the thresholds (see Fig. 4). If
IN
SH
DD
rises again above V
IN
TO
IN
IN
. If V
falls back below V
rises much faster than V
DD
(see. Fig. 4). If V
monitoring is disabled and RES ,
and V
IN
supply and a voltage applied to
DD
IN
falls below the voltage V
reaches the V
DD
IN
monitoring are disabled
monitoring provide high
DD
reached V
DD
OFF
SH
IN
and V
falls below V
, the timer will
(V
ON
DD
ON
ON
SS
level, the
IN
DD
is below
– 0.3 V)
and V
pins. It
Table 6
should
, then
SL
RL
DD
DD
SL
IN
IN
–
,
Version 14: monitor the unregulated voltage and are
ideal for programming of the V
resistor values can be used for programming.
Version 15, 16: monitor the regulated voltage. They are
suited to applications where the unregulated voltage is
not available. (The tolerance is ± 10%, see table 4. For
tighter tolerances, trimming can be used, see Fig. 9).
Monitoring of the unregulated voltage requires version 14.
These versions are based on the principle that V
with V
after V
and 12 have a 100 kΩ nominal resistance from V
(internal voltage divider). The versions 14, 15 and 16
have high impedance V
for external threshold voltage programming by a voltage
divider on pin V
the internal levels V
Electrical Specifications).
5
IN
IN
on power-up an V
starts dropping on power-down. The versions 11
IN
. The levels obtained are proportional to
SH
, V
IN
SL
inputs (see Fig. 7 and Table 4)
DD
and V
IN
holds up for a certain time
voltage thresholds. Fixed
www.emmicroelectronic.com
RL
on the chip itself (see
H6060
IN
DD
to V
rises
SS