x40620 Intersil Corporation, x40620 Datasheet - Page 5

• Manufacturer Part Number: x40620
• Description: Dual Voltage Cpu Supervisor With 64k Serial Eeprom
• Manufacturer: Intersil Corporation

X40620
Figure 5. Reset V2
V
The X40620 is shipped with standard V
V2
normal operating 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 X40620 trip points may be
adjusted. The procedure is described below, and uses
the application of a high voltage control signal.
Setting the V
This procedure is used to set the V
higher voltage value. For example, if the current V
is 4.4V and the new V
directly 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 V
V2MON pin, then tie the RESET pin to the programming
voltage V
Figure 6. Sample V
V
SCL
SDA
CC
CC
TRIP
RESET
V
AND V2MON THRESHOLD RESET PROCEDURE
Adj.
TRIP
V
TRIP
voltages. These values will not change over
P
. Then, write data 01h or 0Dh at address
TRIP
0 1 2 3 4 5 6 7
Voltage
TRIP
CC
TRIP
V2
Adj.
D8h
TRIP
TRIP
pin, the V2
Level Sequence (V
Reset Circuit
is 4.6V, this procedure will
RESET
V2FAIL
TRIP
4.7K
TRIP
0 1 2 3 4 5 6 7
voltage to the
,V2
TRIP
CC
TRIP
TRIP
thresh-
> 3V, WEL is set.)
TRIP
to a
and
00h
V
P
5
4
7
1
= 15V
X40620
00h to program V
bit following a valid write operation initiates the pro-
gramming 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
a “native” voltage level. For example, if the current
V
the V
the new level is something less than 1.7V. This proce-
dure must be used to set the voltage to a lower value.
To reset the new V
desired V
V
pin to the programming voltage V
0Fh to address 00h. The stop bit of a valid write opera-
tion initiates the programming sequence. Bring
RESET LOW to complete the operation. Note: this
operation also writes 03h or 0Fh to address 00h of the
EEPROM array.
TRIP
CC
0 1 2 3 4 5 6 7
8
2
6
3
or V2MON pin, respectively, and tie the RESET
TRIP
is 4.4V and the new V
03h resets V
TRIP
must be reset. When the threshold is reset,
03h
or V2
TRIP
Characteristics subject to change without notice.
CC
TRIP
Adjust
Run
Voltage
TRIP
, V2
TRIP
, V2
TRIP
V
P
threshold voltage to the
0 1 2 3 4 5 6 7
TRIP
TRIP
respectively. The stop
P
00h
must be 4.0V, then
. Then write 03h or
voltage, apply the
TRIP
SCL
SDA
, the V2
µC
TRIP
5 of 17
to