X5083
Resetting the V
TRIP
Voltage
This procedure is used to set the V
TRIP
to a “native”
voltage level. For example, if the current V
TRIP
is 4.4V
and the new V
TRIP
must be 4.0V, then the V
TRIP
must
be reset. When V
TRIP
is reset, the new V
TRIP
is some-
thing less than 1.7V. This procedure must be used to
set the voltage to a lower value.
To reset the new V
TRIP
voltage, apply the desired
V
TRIP
threshold voltage to the Vcc pin and tie the WP
pin to the programming voltage V
P
. Then send a WREN
command, followed by a write of data 00h to address
03h. CS going HIGH on the write operation initiates the
V
TRIP
programming sequence. Bring WP LOW to com-
plete the operation.
Note:
This operation also writes 00h to array address
03h.
Figure 2. Reset V
TRIP
Level Sequence (V
CC
> 3V. WP = 15–18V)
WP
V
P
= 15-18V
CS
0 1 2 3 4 5 6 7
SCK
16 Bits
SI
06h
WREN
02h
Write
0003h
Address
00h
Data
0 1 2 3 4 5 6 7 8 9 10
20 21 22 23
Figure 3. Sample V
TRIP
Reset Circuit
4.7K
V
P
Adjust
V
TRIP
Adj.
1
2
3
4
X5083
8
7
6
5
RESET
µC
SCK
SI
SO
CS
Run
REV 1.1.6 6/25/02
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Characteristics subject to change without notice.
4 of 21
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