X1202
Figure 3. Watchdog Restart/Time Out
t
t
>t
RSP
RSP WDO
t
t
>t
t
RST
t
<t
RST
RSP WDO
RSP WDO
SCL
SDA
RESET
Note: All inputs are ignored during the active reset period (t
).
RST
Figure 4. Power On Reset and Low Voltage Reset
V
TRIP
V
CC
t
t
PURST
PURST
t
RPD
t
F
t
R
RESET
V
RVALID
V
THRESHOLD RESET PROCEDURE
Setting the V
Voltage
CC
TRIP
This procedure is used to set the V
voltage value. It is necessary to reset the trip point
before setting the new value.
to a higher
TRIP
The X1202 is shipped with a standard V
threshold
CC
(V
) voltage. This value will not change over normal
TRIP
operating and storage conditions. However, in applica-
tions where the standard V is not exactly right, or if
TRIP
To set the new V
voltage, apply the desired V
TRIP
TRIP
higher precision is needed in the V
value, the
TRIP
threshold voltage to the V
pin and tie the RESET
CC
X1202 threshold may be adjusted. The procedure
is described below, and uses the application of a
nonvolatile write control signal.
pad pin to the programming voltage V .Then write data
P
00h to address 01h. The stop bit following a valid write
operation initiates the V
programming sequence.
TRIP
Bring RESET to V to complete the operation.
CC
Note: This operation also writes 00h to address 01h of
the EEPROM array.
Characteristics subject to change without notice. 7 of 23
REV 1.1.8 5/17/01
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