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參數(shù)資料
| 型號(hào)： | X1288V14Z-4.5A |
| 廠商： | INTERSIL CORP |
| 元件分類： | XO, clock |
| 英文描述： | 2-Wire⑩ RTC Real Time Clock/Calendar/CPU Supervisor with EEPROM |
| 中文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO14 |
| 封裝： | ROHS COMPLIANT, PLASTIC, TSSOP-14 |
| 文件頁數(shù)： | 15/27頁 |
| 文件大?。?/td> | 425K |
| 代理商： | X1288V14Z-4.5A |
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15
FN8102.3
April 14, 2006
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 5. 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 opera-
tion of any in progress nonvolatile write cycle is unaf-
fected, allowing a nonvolatile write to continue as long
as possible (down to the power-on reset voltage). The
low voltage reset signal, when active, terminates in
progress communications to the device and prevents
new commands, to reduce the likelihood of data cor-
ruption.
V
CC
THRESHOLD RESET PROCEDURE [Optional]
The X1288 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
X1288 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.
Resetting the V
TRIP
Voltage
This procedure is used to set the V
TRIP
to a “native”
voltage level. For example, if the current V
TRIP
is 4.4V
and the new V
TRIP
must be 4.0V, then the V
TRIP
must
be reset. When V
TRIP
is reset, the new V
TRIP
is some-
thing less than 1.7V. This procedure must be used to
set the voltage to a lower value.
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.
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
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
FIGURE 4. WATCHDOG RESTART/TIME OUT
X1288
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| X1288V14ZT1 | 功能描述:IC RTC/CAL/CPU SUP EE 14-TSSOP RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 實(shí)時(shí)時(shí)鐘 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:時(shí)鐘/日歷 特點(diǎn):警報(bào)器，閏年，SRAM 存儲(chǔ)容量:- 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: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 |
| X-1293 | 制造商:Pulse 功能描述:TRANSFORMERS - Rail/Tube |
| X-1297-1 | 制造商:Pulse Electronics Corporation 功能描述:DATA BUS - Rail/Tube |
| X-1298-1 | 制造商:Pulse Electronics Corporation 功能描述:TRANSFORMERS - Rail/Tube |
| X12CP | 制造商:APEM 功能描述:SPST standard toggle switch,15A |
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