X40020S14IZ-A Intersil, X40020S14IZ-A Datasheet - Page 6

• Manufacturer Part Number: X40020S14IZ-A
• Description: IC VOLTAGE MONITOR DUAL 14-SOIC
• Manufacturer: Intersil
• Type: Multi-Voltage Supervisorr

Specifications of X40020S14IZ-A

• Number Of Voltages Monitored: 2
• Output: Open Drain or Open Collector
• Reset: Active High
• Reset Timeout: Adjustable/Selectable
• Voltage - Threshold: 2.9V, 4.6V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 3. V
Figure 4. Watchdog Restart
V1 AND V2 THRESHOLD PROGRAM PROCEDURE
(OPTIONAL)
The X40020/21 is shipped with standard V1 and V2
threshold (V
change over normal operating and storage conditions.
However, in applications where the standard thresholds
are not exactly right, or if higher precision is needed in
the threshold value, the X40020 trip points may be
adjusted. The procedure is described below, and uses
the application of a high voltage control signal.
Setting a V
There are two procedures used to set the threshold volt-
ages (V
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
corresponding input pin (Vcc(V1MON) or V2MON).
Then, a program-ming voltage (Vp) must be applied to
the WDO pin before a START condition is set up on
SDA. Next, issue on the SDA pin the Slave Address A0h,
followed by the Byte Address 01h for V
V
TRIPx
TRIP2
SCL
SDA
desired
, and a 00h Data Byte in order to program V
is 3.2 V, the new voltage can be stored directly
TRIPx
TRIPx
WDO
SCL
SDA
TRIPx
TRIPX
TRIP1,
TRIPx
TRIPx
.6µs
), depending if the threshold voltage to be
Start
cell. If however, the new setting is to be
V
Voltage (x = 1, 2)
voltage before setting the new value.
threshold to a new voltage which is
TRIPx
Set/Reset Conditions
V
TRIPx
TRIP2
) voltages. These values will not
Voltage (x = 1, 2)
threshold
0
V
A0h
1.3µs
TRIPx
TRIPX
6
WDT Reset
is 2.9 V and the new
(X = 1, 2)
voltage
TRIP1
7
Stop
, and 09h for
0
to
TRIPx
X40020, 40021
the
V
CC
.
/V2MON
7
V
The STOP bit following a valid write operation initiates
the programming sequence. Pin WDO must then be
brought LOW to complete the operation.
To check if the V
value slightly greater than V
set). Slowly ramp down VXMON and observe when the
corresponding outputs (LOWLINE and V2FAIL) switch.
The voltage at which this occurs is the V
C
Now if the desired V
(actual), then add the difference between V
(desired) - V
This is your new V
VXMON and the whole sequence should be repeated
again (see Figure 5).
C
Now if the V
(desired), perform the reset sequence as described in
the next section. The new V
to VXMON will now be: V
(actual) - V
Note: 1. This operation does not corrupt the memory
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
ASE
ASE
00h
2. Set V
A
B
array.
grammed
TRIPx
TRIPX
TRIPX
TRIPX
Voltage”.
CC
7
(desired)).
TRIPX
(actual) to the original V
TRIPx
= 5V, when V
TRIPx
(actual), is higher than the V
TRIPX
TRIPx
TRIPX
has been set, set VXMON to a
t
TRIPx
WC
Voltage (x = 1, 2)
to a lower voltage than the
must first be “reset” accord-
that should be applied to
is greater than the V
TRIPX
TRIPX
TRIPX
can be set to the desired
voltage to be applied
TRIP2
(that was previously
(desired) - (V
TRIPX
is being pro-
TRIPX
(actual).
May 17, 2006
desired.
FN8112.1
TRIPX
TRIPX
TRIPX
TRIPX
TRIPx