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X1227S8I-2.7A データシート(PDF) 9 Page - Xicor Inc.

部品番号 X1227S8I-2.7A
部品情報  Real Time Clock/Calendar/CPU Supervisor with EEPROM
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メーカー  XICOR [Xicor Inc.]
ホームページ  http://www.xicor.com
Logo XICOR - Xicor Inc.

X1227S8I-2.7A データシート(HTML) 9 Page - Xicor Inc.

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X1227
REV 1.1.20 1/13/03
Characteristics subject to change without notice.
9 of 28
www.xicor.com
Figure 4. Power On Reset and Low Voltage Reset
VCC
VTRIP
RESET
tPURST
tPURST
tR
tF
tRPD
VRVALID
VCC THRESHOLD RESET PROCEDURE
[OPTIONAL]
The X1227 is shipped with a standard VCC threshold
(VTRIP) voltage. This value will not change over normal
operating and storage conditions. However, in applica-
tions where the standard VTRIP is not exactly right, or if
higher precision is needed in the VTRIP value, the
X1227 threshold may be adjusted. The procedure is
described below, and uses the application of a nonvol-
atile write control signal.
Setting the VTRIP Voltage
It is necessary to reset the trip point before setting the
new value.
To set the new VTRIP voltage, apply the desired VTRIP
threshold voltage to the VCC pin and tie the RESET pin
to the programming voltage VP. Then write data 00h to
address 01h. The stop bit following a valid write opera-
tion initiates the VTRIP programming sequence. Bring
RESET to VCC to complete the operation. Note: this
operation may take up to 10 milliseconds to complete
and also writes 00h to address 01h of the EEPROM
array.
Figure 5. Set VTRIP Level Sequence (VCC = desired VTRIP value)
SCL
SDA
01h
RESET
VP = 15V
00h
012 345 67
0 1 2 345 67
01 2 3 4 5 6 7
0 1 2 3 45 67
AEh
00h
VCC
VCC
Note: BP0, BP1, BP2 must be disabled.
Resetting the VTRIP Voltage
This procedure is used to set the VTRIP to a “native”
voltage level. For example, if the current VTRIP is 4.4V
and the new VTRIP must be 4.0V, then the VTRIP must
be reset. When VTRIP is reset, the new VTRIP is some-
thing less than 1.7V. This procedure must be used to
set the voltage to a lower value.
To reset the new VTRIP voltage, apply more than 5.5V
to the VCC pin and tie the RESET pin to the
programming voltage VP. Then write 00h to address
03h. The stop bit of a valid write operation initiates the
VTRIP programming sequence. Bring RESET to VCC 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 VTRIP, it is advised that the
following sequence be used.
1.Program VTRIP as above.
2.Measure resulting VTRIP by measuring the VCC
value where a RESET occurs. Calculate Delta =
(Desired – Measured) VTRIP value.
3.Perform a VTRIP program using the following formula
to set the voltage of the RESET pin:
VRESET = (Desired Value – Delta) + 0.025V


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