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參數(shù)資料
| 型號： | X1228S14IZ-4.5A |
| 廠商： | INTERSIL CORP |
| 元件分類： | XO, clock |
| 英文描述： | 16 Characters x 1 Lines, 5x7 Dot Matrix Character and Cursor |
| 中文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO14 |
| 封裝： | ROHS COMPLIANT, PLASTIC, SOIC-14 |
| 文件頁數(shù)： | 16/31頁 |
| 文件大?。?/td> | 569K |
| 代理商： | X1228S14IZ-4.5A |
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X1228
REV 1.3 3/24/04
Characteristics subject to change without notice.
16 of 31
www.xicor.com
LOW VOLTAGE RESET OPERATION
When a power failure occurs, and the voltage to the
part drops below a fixed v
TRIP
voltage, a reset pulse is
issued to the host microcontroller. The circuitry moni-
tors the V
CC
line with a voltage comparator which
senses a preset threshold voltage. Power up and
power down waveforms are shown in Figure 4. The
Low Voltage Reset circuit is to be designed so the
RESET signal is valid down to 1.0V.
When the low voltage reset signal is active, the operation
of any in progress nonvolatile write cycle is unaffected,
allowing a nonvolatile write to continue as long as possi-
ble (down to the power on reset voltage). The low voltage
reset signal, when active, terminates in progress commu-
nications to the device and prevents new commands, to
reduce the likelihood of data corruption.
Figure 3. Watchdog Restart/Time Out
Figure 4. Power On Reset and Low Voltage Reset
V
CC
THRESHOLD RESET PROCEDURE
[OPTIONAL]
The X1228 is shipped with a standard V
CC
threshold
(V
TRIP
) voltage. This value will not change over normal
operating and storage conditions. However, in applica-
tions where the standard V
TRIP
is not exactly right, or if
higher precision is needed in the V
TRIP
value, the
X1228 threshold may be adjusted. The procedure is
described below, and uses the application of a nonvol-
atile write control signal.
Setting the V
TRIP
Voltage
It is necessary to reset the trip point before setting the
new value.
To set the new V
TRIP
voltage, apply the desired V
TRIP
threshold voltage to the V
CC
pin and tie the RESET pin
to the programming voltage V
P
. Then write data 00h to
address 01h. The stop bit following a valid write opera-
tion initiates the V
TRIP
programming sequence. Bring
RESET to V
CC
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.
t
RSP
<t
WDO
t
RST
RESET
SDA
t
RSP
Note:
All inputs are ignored during the active reset period (t
RST
).
t
RST
SCL
t
RSP
>t
WDO
t
RSP
>t
WDO
Start
Stop
Start
V
CC
V
TRIP
RESET
t
PURST
t
PURST
t
R
t
F
t
RPD
V
RVALID
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| X1228V14Z-4.5A | 16 Characters x 1 Lines, 5x7 Dot Matrix Character and Cursor |
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| X1228S14Z-2.7 | 功能描述:IC RTC/CAL/CPU SUP EE 14-SOIC RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 實時時鐘 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標準包裝:1 系列:- 類型:時鐘/日歷 特點:警報器，閏年，SRAM 存儲容量:- 時間格式:HH:MM:SS（12/24 小時） 數(shù)據(jù)格式:YY-MM-DD-dd 接口:SPI 電源電壓:2 V ~ 5.5 V 電壓 - 電源，電池:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN EP 包裝:管件 |
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