X4003 Datasheet, PDF (4/17 Pages) Xicor Inc. – CPU Supervisor

X4003, X4005
To set the new V_TRIP voltage, apply the desired V_TRIP
threshold voltage to the V_CC pin and tie the WP pin to
the programming voltage V_P. Then write data 00hto
address 01h. The stop bit following a valid write opera-
tion initiates the V_TRIP programing sequence. Bring WP
LOW to complete the operation.
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 V_CC pin and tie the WP
pin to the programming voltage V_P. Then write 00h to
address 03h. The stop bit of a valid write operation ini-
tiates the V_TRIP programming sequence. Bring WP
LOW to complete the operation.
Figure 2. Reset V_TRIP Level Sequence (V_CC > 3V. WP = 15-18V)
WP
V_P = 15 - 18V
0 1 23 4 56 7
0 1 23 4 56 7
0 1 23 4 56 7
SCL
SDA
A0h
Figure 3. Sample V_TRIP Reset Circuit
V_TRIP
Adj.
4.7K
RESET/
RESET
03h
1
8
2
7
3 ^X4003/05 6
4
5
00h
V_P
Adjust
Run
µC
SCL
SDA
4
FN8113.0
March 15, 2005