X40010S8I-CT1 Intersil, X40010S8I-CT1 Datasheet - Page 4

• Manufacturer Part Number: X40010S8I-CT1
• Description: IC VOLTAGE MONITOR DUAL 8-SOIC
• Manufacturer: Intersil
• Type: Multi-Voltage Supervisorr

Specifications of X40010S8I-CT1

• Number Of Voltages Monitored: 2
• Output: Push-Pull, Totem Pole
• Reset: Active High
• Reset Timeout: Adjustable/Selectable
• Voltage - Threshold: 1.7V, 2.9V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Figure 2. V
WATCHDOG TIMER
The Watchdog Timer circuit monitors the microprocessor
activity by monitoring the SDA and SCL pins. The micro-
processor must toggle the SDA pin HIGH to LOW period-
ically, while SCL also toggles from HIGH to LOW (this is
a start bit) followed by a stop condition prior to the expira-
tion of the watchdog time out period to prevent a WDO
signal going active. The state of two nonvolatile control
bits in the Status Register determines the watchdog timer
period. The microprocessor can change these watchdog
bits by writing to the X40010/11/14/15 control register
(also refer to page 19).
Figure 3. Watchdog Restart
V1 AND V2 THRESHOLD PROGRAM PROCEDURE
(OPTIONAL)
The X40010/11/14/15is shipped with standard V1 and
V2 threshold (V
will not change over normal operating and storage
conditions. However, in applications where the stan-
dard thresholds are not exactly right, or if higher preci-
sion
X40010/11/14/15trip points may be adjusted. The pro-
cedure is described below, and uses the application of
a high voltage control signal.
SCL
SDA
WDO
SCL
SDA
is
needed
TRIPX
.6µs
TRIP1,
Set/Reset Conditions
0
A0h
V
in
TRIPX
V
TRIP2
the
1.3µs
4
) voltages. These values
threshold
(X = 1, 2)
Timer Start
7
X40010, X40011, X40014, X40015
0
value,
the
V
CC
/V2MON
7
V
Setting a V
There are two procedures used to set the threshold
voltages (V
be stored is higher or lower than the present value. For
example, if the present V
V
into the V
lower than the present setting, then it is necessary to
“reset” the V
Setting a Higher V
To set a V
higher than the present threshold, the user must apply
the desired V
sponding input pin Vcc(V1MON), or V2MON. The
Vcc(V1MON) and V2MON must be tied together dur-
ing this sequence. Then, a programming voltage (Vp)
must be applied to the WDO pin before a START con-
dition is set up on SDA. Next, issue on the SDA pin the
Slave Address A0h, followed by the Byte Address 01h
for V
order to program V
valid write operation initiates the programming
sequence. Pin WDO must then be brought LOW to
complete the operation.
Note: This operation does not corrupt the memory
array.
Setting a Lower V
In order to set V
present value, then V
ing to the procedure described below. Once V
has been “reset”, then V
voltage using the procedure described in “Setting a
Higher V
P
0
TRIPx
TRIP1
00h
is 3.2 V, the new voltage can be stored directly
TRIPx
TRIPx
and 09h for V
TRIPx
TRIPx
TRIPx
TRIPx
Voltage”.
TRIPx
cell. If however, the new setting is to be
), depending if the threshold voltage to
threshold to a new voltage which is
Voltage (x = 1, 2)
voltage before setting the new value.
7
TRIPx
TRIPx
TRIPx
TRIPx
threshold voltage to the corre-
TRIPx
TRIPx
TRIP2
Voltage (x = 1, 2)
to a lower voltage than the
Voltage (x = 1, 2)
. The STOP bit following a
TRIPx
must first be “reset” accord-
t
WC
, and a 00h Data Byte in
can be set to the desired
is 2.9 V and the new
March 28, 2005
FN8111.0
TRIPx