X46402V8-3.1 XICOR [Xicor Inc.], X46402V8-3.1 Datasheet - Page 6

• Manufacturer Part Number: X46402V8-3.1
• Description: Dual Voltage CPU Supervisor with 64K Password Protected EEPROM
• Manufacturer: XICOR [Xicor Inc.]

X46402
Figure 5. Reset V2
V
The X46402 is shipped with standard V
voltages. These values will not change over normal oper-
ating and storage conditions. However, in applications
where the standard thresholds are not exactly right, or if
higher precision is needed in the threshold value, the
X46402 trip points may be adjusted. The procedure is
described below, and uses the application of a high volt-
age control signal.
Setting the V
This procedure is used to set the V
voltage value. For example, if the current V
and the new V
make the change. If the new setting is to be lower than
the current setting, then it is necessary to reset the trip
point before setting the new value.
To set the new voltages, apply the desired V
old voltage to the Vcc pin, the V2
V2MON pin, then tie the RESET pin to the programming
voltage V
Figure 6. Sample V
V2MON
CC
V
Adj.
TRIP
AND V2MON THRESHOLD RESET PROCEDURE
RESET
SCL
SDA
V2
TRIP
P
. Then, write data 01h or 0Dh address 00h to
TRIP
TRIP
Voltage
0 1 2 3 4 5 6 7
TRIP
V2
is 4.6V, this procedure will directly
TRIP
Adj.
TRIP
Level Sequence (Vcc > 3V, WEL is set.)
Reset Circuit
D8h
RESET
V2FAIL
TRIP
4.7K
TRIP
,V2
TRIP ,
TRIP
voltage to the
TRIP
TRIP
and V2
to a higher
0 1 2 3 4 5 6 7
is 4.4V
thresh-
TRIP
5
4
7
1
V
P
X46402
= 15V
00h
6
program V
a valid write operation initiates the programming
sequence. Bring RESET LOW to complete the operation.
Note: this operation also writes 01h, or 0Dh to address
00h.
Resetting the V
This procedure is used to set the V
“native” voltage level. For example, if the current V
4.4V and the new V
must be reset. When the threshold is reset, the new level
is something less than 1.7V. This procedure must be
used to set the voltage to a lower value.
To reset the new V
V
pin, respectively, and tie the RESET pin to the program-
ming voltage V
The stop bit of a valid write operation initiates the pro-
gramming sequence. Bring RESET LOW to complete the
operation. Note: this operation also writes 03h or 0Fh to
address 00h of the EEPROM array.
TRIP
8
2
6
3
or V2
TRIP
TRIP
0 1 2 3 4 5 6 7
, V2
P
. Then write 03h or 0Fh to address 00h.
0Fh resets V2MON
threshold voltage to the Vcc or V2MON
TRIP
Adjust
TRIP
TRIP
Preliminary Information
Run
TRIP
0Fh
Voltage
, V2
respectively. The stop bit following
V
must be 4.0V, then the V
TRIP
P
voltage, apply the desired
TRIP
SCL
SDA
, the V2
µC
TRIP
TRIP
TRIP
to a
is