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X40035VC Datasheet(PDF) 8 Page - Intersil Corporation

Part # X40035VC
Description  Triple Voltage Monitor with Integrated CPU Supervisor
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

X40035VC Datasheet(HTML) 8 Page - Intersil Corporation

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8
FN8114.2
August 25, 2008
FIGURE 3. VTRIPX SET/RESET CONDITIONS
Watchdog Timer
The Watchdog Timer circuit monitors the microprocessor
activity by monitoring the SDA and SCL pins. A standard
read or write sequence to any slave address byte restarts
the watchdog timer and prevents the WDO signal from going
active. A minimum sequence to reset the watchdog timer
requires four microprocessor instructions namely, a Start,
Clock Low, Clock High and Stop. The state of two nonvolatile
control bits in the Status Register determine the watchdog
timer period. The microprocessor can change these
watchdog bits by writing to the X40030, X40031, X40034,
X40035 control register (also refer to page 21).
FIGURE 4. WATCHDOG RESTART
V1, V2 and V3 Threshold Program
Procedure (Optional)
The X40030 is shipped with standard V1, V2 and V3
threshold (VTRIP1, VTRIP2, VTRIP3) voltages. These values
will not 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 X40030, X40031, X40034,
X40035 trip points may be adjusted. The procedure is
described in the following and uses the application of a high
voltage control signal.
Setting a VTRIPx Voltage (x = 1, 2, 3)
There are two procedures used to set the threshold voltages
(VTRIPx), depending upon if the threshold voltage to be stored
is higher or lower than the present value. For example, if the
present VTRIPx is 2.9V and the new VTRIPx is 3.2V, 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, 3)
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), V2MON or V3MON). Then, a programming
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, 09h for VTRIP2, and 0Dh for VTRIP3, 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, V2FAIL and V3FAIL) switch. The voltage
at which this occurs is the VTRIPX (actual).
CASE A
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
If the VTRIPX (actual), is higher than the VTRIPX (desired),
perform the reset sequence as described in the next section.
VCC/V2MON/V3MON
VTRIPX
VP
tWC
A0h
0
7
70
7
0
SCL
WDO
SDA
(X = 1, 2, 3)
00h
SCL
SDA
0.6µs
1.3µs
WDT RESET
START
STOP
X40030, X40031, X40034, X40035


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