X40420S14I-B Intersil, X40420S14I-B Datasheet - Page 6

• Manufacturer Part Number: X40420S14I-B
• Description: IC VOLT MON DUAL SUP/SW 14-SOIC
• Manufacturer: Intersil
• Type: Multi-Voltage Supervisorr

Specifications of X40420S14I-B

• Number Of Voltages Monitored: 2
• Output: Open Drain, Open Drain
• Reset: Active High/Active Low
• Reset Timeout: Adjustable/Selectable
• Voltage - Threshold: 2.6V, 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: Contains lead / RoHS non-compliant

Figure 3. V
Figure 4. Watchdog Restart
V1 AND V2 THRESHOLD PROGRAM PROCEDURE
(OPTIONAL)
The X40420, X40421 is shipped with standard V1 and
V2 threshold (V
not change over normal operating and storage condi-
tions. However, in applications where the standard
thresholds are not exactly right, or if higher precision is
needed in the threshold value, the X40420 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
TRIPx
TRIPx
.6µs
), depending if the threshold voltage to be
Start
TRIP1,
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
TRIPx
V
TRIP2
Voltage (x = 1, 2)
threshold
0
V
A0h
1.3µs
TRIPx
TRIPX
6
) voltages. These values will
WDT Reset
is 2.9 V and the new
(X = 1, 2)
voltage
TRIP1
7
Stop
, and 09h for
0
to
X40420, X40421
TRIPx
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 in the following section.
Once V
to the desired voltage using the procedure described
in “Setting a Higher V
P
0
ASE
ASE
00h
2. Set V
A
B
TRIPx
array.
grammed
TRIPX
TRIPX
TRIPX
has been “reset”, then V
CC
7
(desired)).
TRIPX
(actual) to the original V
TRIPx
= 5V, when V
TRIPx
(actual), is higher than the V
TRIPX
TRIPx
TRIPx
TRIPX
has been set, set VXMON to a
t
WC
Voltage (x = 1, 2)
to a lower voltage than the
must first be “reset” accord-
Voltage”.
that should be applied to
is greater than the V
TRIPX
TRIPX
TRIPX
voltage to be applied
TRIP2
(that was previously
(desired) - (V
TRIPx
TRIPX
is being pro-
TRIPX
(actual).
can be set
May 25, 2006
desired.
TRIPX
TRIPX
TRIPX
TRIPX