X1288 Xicor, X1288 Datasheet - Page 18

• Manufacturer Part Number: X1288
• Description: 2-Wire RTC Real Time Clock/Calendar/CPU Supervisor with EEPROM
• Manufacturer: Xicor

To reset the new V
to the V
programming voltage V
03h. The stop bit of a valid write operation initiates the
V
complete the operation. Note: this operation takes up
to 10 milliseconds to complete and also writes 00h to
address 03h of the EEPROM array.
For best accuracy in setting V
following sequence be used.
Preliminary Information
Figure 5. Power On Reset and Low Voltage Reset
Figure 6. Set V
Figure 7. Reset V
REV 1.1.30 3/24/04
RESET
Note: BP0, BP1, BP2 must be disabled.
RESET
TRIP
Note: BP0, BP1, BP2 must be disabled.
V
SDA
SCL
SDA
CC
V
SCL
CC
programming sequence. Bring RESET to V
CC
RESET
V
pin and tie the RESET pin to the
CC
TRIP
0 1 2 3 4 5 6 7
0 1 2 3 4 5 6 7
TRIP
TRIP
V
Level Sequence (V
TRIP
Level Sequence
t
R
voltage, apply more than 5.5V
P
. Then write 00h to address
AEh
AEh
TRIP
t
PURST
, it is advised that the
0 1 2 3 4 5 6 7
0 1 2 3 4 5 6 7
CC
= desired V
00h
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00h
CC
V
P
V
= 15V
P
to
t
RPD
= 15V
TRIP
1.Program V
2.Measure resulting V
3.Perform a V
value)
value where a RESET occurs. Calculate Delta =
(Desired – Measured) V
to set the voltage of the RESET pin:
V
RESET
0 1 2 3 4 5 6 7
0 1 2 3 4 5 6 7
t
PURST
= (Desired Value – Delta) + 0.025V
01h
TRIP
03h
TRIP
as above.
program using the following formula
TRIP
TRIP
0 1 2 3 4 5 6 7
by measuring the V
0 1 2 3 4 5 6 7
t
F
value.
00h
00h
V
RVALID
X1288
CC
18 of 31
V
V
CC
CC