X1288S16I-2.7A
| Model | X1288S16I-2.7A |
| Description | 2-Wire RTC Real Time Clock/Calendar/CPU Supervisor with EEPROM |
| PDF file | Total 31 pages (File size: 559K) |
| Chip Manufacturer | XICOR |
Preliminary Information
To reset the new V
TRIP
voltage, apply more than 5.5V
to the V
CC
pin and tie the RESET pin to the
programming voltage V
P
. Then write 00h to address
03h. The stop bit of a valid write operation initiates the
V
TRIP
programming sequence. Bring RESET to V
CC
to
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
TRIP
, it is advised that the
following sequence be used.
1.Program V
TRIP
as above.
X1288
2.Measure resulting V
TRIP
by measuring the V
CC
value where a RESET occurs. Calculate Delta =
(Desired – Measured) V
TRIP
value.
3.Perform a V
TRIP
program using the following formula
to set the voltage of the RESET pin:
V
RESET
= (Desired Value – Delta) + 0.025V
Figure 5. Power On Reset and Low Voltage Reset
V
TRIP
V
CC
t
PURST
t
RPD
t
R
RESET
t
F
V
RVALID
t
PURST
Figure 6. Set V
TRIP
Level Sequence (V
CC
= desired V
TRIP
value)
RESET
V
CC
0 1 2 3 4 5 6 7
SCL
0 1 2 3 4 5 6 7
0 1 2 3 4 5 6 7
0 1 2 3 4 5 6 7
V
P
= 15V
V
CC
SDA
AEh
Note:
BP0, BP1, BP2 must be disabled.
00h
01h
00h
Figure 7. Reset V
TRIP
Level Sequence
RESET
V
CC
0 1 2 3 4 5 6 7
SCL
SDA
AEh
Note:
BP0, BP1, BP2 must be disabled.
00h
03h
00h
0 1 2 3 4 5 6 7
0 1 2 3 4 5 6 7
0 1 2 3 4 5 6 7
V
P
= 15V
V
CC
REV 1.1.30 3/24/04
www.xicor.com
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