X4323_06 Datasheet, PDF (6/22 Pages) Intersil Corporation – CPU Supervisor with 32k EEPROM

X4323, X4325
Setting the V_TRIP Voltage
This procedure is used to set the V_TRIP to a higher or
lower voltage value. It is necessary to reset the trip
point before setting the new value.
To set the new V_TRIP voltage, start by setting the WEL
bit in the control register, then apply the desired V_TRIP
threshold voltage to the V_CC pin and the programming
voltage, V_P, to the WP pin and 2-byte address and 1
byte of “00” data. The stop bit following a valid write
operation initiates the V_TRIP programming 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 start by setting the
WEL bit in the control register, apply the desired V_TRIP
threshold voltage to the V_CC pin and the programming
voltage, V_P, to the WP pin and 2-byte address and 1
byte of “00” data. The stop bit of a valid write operation
initiates the V_TRIP programming sequence. Bring WP
LOW to complete the operation.
Figure 2. Reset V_TRIP Level Sequence (V_CC > 3V. WP = 12-15V, WEL bit set)
WP
SCL
SDA
V_P = 12-15V
01234567 01234567
0 1 23 4 56 7
0123456 7
A0h
00h
03h
00h
Figure 3. Sample V_TRIP Reset Circuit
V_TRIP
Adj.
4.7K
RESET
SOIC
1
8
2
7
3 ^X4323 6
4
5
V_P
Adjust
Run
µC
SCL
SDA
6
FN8122.1
May 25, 2006