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X40420 Datasheet(PDF) 6 Page - Intersil Corporation

Part No. X40420
Description  Dual Voltage Monitor with Integrated CPU Supervisor and System Battery Switch
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
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X40420 Datasheet(HTML) 6 Page - Intersil Corporation

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6
May 25, 2006
Figure 3. VTRIPX Set/Reset Conditions
Figure 4. Watchdog Restart
V1 AND V2 THRESHOLD PROGRAM PROCEDURE
(OPTIONAL)
The X40420, X40421 is shipped with standard V1 and
V2 threshold (VTRIP1, VTRIP2) voltages. These values will
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 VTRIPx Voltage (x = 1, 2)
There are two procedures used to set the threshold volt-
ages (VTRIPx), depending if the threshold voltage to be
stored is higher or lower than the present value. For
example, if the present VTRIPx is 2.9 V and the new
VTRIPx is 3.2 V, the new voltage can be stored directly
into the VTRIPx cell. If however, the new setting is to be
lower than the present setting, then it is necessary to
“reset” the VTRIPx voltage before setting the new value.
Setting a Higher VTRIPx Voltage (x = 1, 2)
To set a VTRIPx threshold to a new voltage which is
higher than the present threshold, the user must apply
the
desired
VTRIPx threshold voltage to 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 VTRIP1, and 09h for
VTRIP2, and a 00h Data Byte in order to program VTRIPx.
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 VTRIPX has been set, set VXMON to a
value slightly greater than VTRIPX (that was previously
set). Slowly ramp down VXMON and observe when the
corresponding outputs (LOWLINE and V2FAIL) switch.
The voltage at which this occurs is the VTRIPX (actual).
CASE A
Now if the desired VTRIPX is greater than the VTRIPX
(actual), then add the difference between VTRIPX
(desired) - VTRIPX (actual) to the original VTRIPX desired.
This is your new VTRIPX that should be applied to
VXMON and the whole sequence should be repeated
again (see Figure 5).
CASE B
Now if the VTRIPX (actual), is higher than the VTRIPX
(desired), perform the reset sequence as described in
the next section. The new VTRIPX voltage to be applied
to VXMON will now be: VTRIPX (desired) - (VTRIPX
(actual) - VTRIPX (desired)).
Note: 1. This operation does not corrupt the memory
array.
2. Set VCC = 5V, when VTRIP2 is being pro-
grammed
Setting a Lower VTRIPx Voltage (x = 1, 2)
In order to set VTRIPx to a lower voltage than the
present value, then VTRIPx must first be “reset” accord-
ing to the procedure described in the following section.
Once VTRIPx has been “reset”, then VTRIPx can be set
to the desired voltage using the procedure described
in “Setting a Higher VTRIPx Voltage”.
VCC/V2MON
VTRIPX
VP
tWC
A0h
0
7
70
7
0
SCL
WDO
SDA
(X = 1, 2)
00h
SCL
SDA
.6µs
1.3µs
WDT Reset
Start
Stop
X40420, X40421


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