X4003/X4005
To set the new V
voltage, apply the desired V
be reset. When V
is reset, the new V
is some-
TRIP
TRIP
TRIP
TRIP
threshold voltage to the V
the programming voltage V . Then write data 00hto
pin and tie the WP pin to
thing less than 1.7V. This procedure must be used to
set the voltage to a lower value.
CC
P
address 01h.The stop bit following a valid write operation
To reset the new V
voltage, apply the desired
TRIP
initiates the V
programing sequence. Bring WP
TRIP
V
threshold voltage to the V
pin and tie the WP
TRIP
CC
LOW to complete the operation.
pin to the programming voltage V . Then write 00h to
P
address 03h. The stop bit of a valid write operation ini-
Resetting the V Voltage
TRIP
tiates the V
programming sequence. Bring WP
TRIP
This procedure is used to set the V
voltage level. For example, if the current V
to a “native”
TRIP
LOW to complete the operation.
is 4.4V
TRIP
and the new V
must be 4.0V, then the V
must
TRIP
TRIP
Figure 2. Reset V
Level Sequence (V
> 3V. WP = 15-18V)
TRIP
CC
V
3
= 15-18V
P
WP
0
1 2 3 4 5 6 7
0
1
2
3 4 5 6 7
0
1
2
4 5 6 7
SCL
SDA
A0h
03h
00h
Figure 3. Sample V
Reset Circuit
TRIP
V
P
Adjust
Run
4.7K
µC
1
2
3
4
8
RESET/
RESET
7
6
5
X4003/05
V
TRIP
Adj.
SCL
SDA
Characteristics subject to change without notice. 4 of 18
REV 1.1.3 4/30/02
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