X40626 Datasheet, PDF (4/22 Pages) Xicor Inc. – Dual Voltage CPU Supervisor with 64K Serial EEPROM

X40626
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/V_2MON > 3V, WP = 12-15V, WEL bit set)
WP
V_P = 12-15V
01234567 01234567
0 1 23 4 56 7
0123456 7
SCL
SDA
A0H
00H
xxH*
00H
*for V_TRIP2 address is 0FH
for V_TRIP address is 03H
Figure 3. Sample V_TRIP Reset Circuit
V_TRIP
Adj.
4.7K
RESET
1
14
2
13
3
12
4
5
X40626
6
9
7
8
V_P
Adjust
Run
µC
SCL
SDA
4
FN8119.0
March 28, 2005