X1241 – Preliminary Information
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
It is necessary to reset the trip point before setting the
new value.
The X1241 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
To set the new V
threshold voltage to the V pin and tie the RESET pin
to the programming voltage V . Then write data 00h to
address 01h. The stop bit following a valid write opera-
tion initiates the V
RESET LOW to complete the operation.
voltage, apply the desired V
TRIP
TRIP
TRIP
CC
higher precision is needed in the V
value, the
TRIP
P
X1241 threshold may be adjusted. The procedure is
described below, and uses the application of a non vol-
atile write control signal.
programming sequence. Bring
TRIP
Note: This operation also writes 00h to address 01h of
the EEPROM array.
Figure 5. Set V
Level Sequence (V = desired V value.)
TRIP
TRIP
CC
V
= 15V
P
RESET
0
1
2
3
4
5 6 7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4 5 6 7
SCL
SDA
AEh
00h
01h
00h
Resetting the V
Voltage
be reset. When V
is reset, the new V
is some-
TRIP
TRIP
TRIP
thing less than 1.7V. This procedure must be used to
set the voltage to a lower value.
This procedure is used to set the V
voltage level. For example, if the current V
to a “native”
TRIP
is 4.4V
TRIP
and the new V
must be 4.0V, then the V
must
TRIP
TRIP
Characteristics subject to change without notice. 7 of 22
REV 1.1.3 2/13/01
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