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參數(shù)資料
型號(hào)： X1227V8Z-2.7
廠商： Intersil
文件頁(yè)數(shù)： 8/28頁(yè)
文件大?。?/td> 0K
描述： IC RTC/CAL/CPU SUP EE 8-TSSOP
標(biāo)準(zhǔn)包裝： 100
類(lèi)型： 時(shí)鐘/日歷
特點(diǎn)： 警報(bào)器，閏年，監(jiān)控器，監(jiān)視計(jì)時(shí)器
時(shí)間格式： HH:MM:SS（12/24 小時(shí)）
數(shù)據(jù)格式： YY-MM-DD-dd
接口： I²C，2 線串口
電源電壓： 2.7 V ~ 5.5 V
電壓 - 電源，電池： 1.8 V ~ 5.5 V
工作溫度： 0°C ~ 70°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 8-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 8-TSSOP
包裝： 管件
16
FN8099.2
May 8, 2006
Figure 5. Power-on Reset and Low Voltage Reset
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 operation initiates the VTRIP program-
ming sequence. Bring RESET to VCC to complete the
operation. Note: this operation may take up to 10 mil-
liseconds to complete and also writes 00h to address
01h of the EEPROM array.
Figure 6. Set VTRIP Level Sequence (VCC = desired VTRIP value)
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 3.0V
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
VCC
VTRIP
RESET
tPURST
tR
tF
tRPD
VRVALID
SCL
SDA
01h
RESET
VP = 15V
00h
01 2 3 45 67
0 1 2 3 45 67
01 2 3 4 5 6 7
AEh
00h
VCC
Note: BP0, BP1, BP2 must be disabled.
X1227
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