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參數(shù)資料
| 型號： | X1227V8Z-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, PDSO8 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MO-153AC, TSSOP-8 |
| 文件頁數(shù)： | 3/28頁 |
| 文件大小： | 442K |
| 代理商： | X1227V8Z-4.5A |
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X1227
REV 1.1.20 1/13/03
Characteristics subject to change without notice.
3 of 28
www.xicor.com
POWER CONTROL OPERATION
The power control circuit accepts a V
input. The power control circuit powers the device from
V
BACK
when V
CC
< V
BACK
- 0.2V. It will switch back to
power the device from V
CC
CC
and a V
BACK
when V
CC
exceeds V
BACK
.
Figure 2. Power Control
REAL TIME CLOCK OPERATION
The Real Time Clock (RTC) uses an external
32.768kHz quartz crystal to maintain an accurate
internal representation of the second, minute, hour,
day, date, month, and year. The RTC has leap-year
correction. The clock also corrects for months having
fewer than 31 days and has a bit that controls 24 hour
or AM/PM format. When the X1227 powers up after
the loss of both V
CC
and V
operate until at least one byte is written to the clock
register.
BACK
, the clock will not
Reading the Real Time Clock
The RTC is read by initiating a Read command and
specifying the address corresponding to the register of
the Real Time Clock. The RTC Registers can then be
read in a Sequential Read Mode. Since the clock runs
continuously and a read takes a finite amount of time,
there is the possibility that the clock could change during
the course of a read operation. In this device, the time is
latched by the read command (falling edge of the clock
on the ACK bit prior to RTC data output) into a separate
latch to avoid time changes during the read operation.
The clock continues to run. Alarms occurring during a
read are unaffected by the read operation.
Writing to the Real Time Clock
The time and date may be set by writing to the RTC
registers. To avoid changing the current time by an
uncompleted write operation, the current time value is
loaded into a separate buffer at the falling edge of the
clock on the ACK bit before the RTC data input bytes,
the clock continues to run. The new serial input data
replaces the values in the buffer. This new RTC value
is loaded back into the RTC Register by a stop bit at
the end of a valid write sequence. An invalid write
operation aborts the time update procedure and the
contents of the buffer are discarded. After a valid write
operation the RTC will reflect the newly loaded data
beginning with the next “one second” clock cycle after
the stop bit is written. The RTC continues to update
the time while an RTC register write is in progress and
the RTC continues to run during any nonvolatile write
sequences. A single byte may be written to the RTC
without affecting the other bytes.
Accuracy of the Real Time Clock
The accuracy of the Real Time Clock depends on the
frequency of the quartz crystal that is used as the time
base for the RTC. Since the resonant frequency of a
crystal is temperature dependent, the RTC perfor-
mance will also be dependent upon temperature. The
frequency deviation of the crystal is a fuction of the
turnover temperature of the crystal from the crystal’s
nominal frequency. For example, a >20ppm frequency
deviation translates into an accuracy of >1 minute per
month. These parameters are available from the
crystal manufacturer. Xicor’s RTC family provides on-
chip crystal compensation networks to adjust load-
capacitance to tune oscillator frequency from +116
ppm to –37 ppm when using a 12.5 pF load crystal.
For more detail information see the Application
section.
CLOCK/CONTROL REGISTERS (CCR)
The Control/Clock Registers are located in an area
separate from the EEPROM array and are only
accessible following a slave byte of “1101111x” and
reads or writes to addresses [0000h:003Fh]. The
clock/control memory map has memory addresses
from 0000h to 003Fh. The defined addresses are
described in the Table 1. Writing to and reading from
the undefined addresses are not recommended.
CCR access
The contents of the CCR can be modified by perform-
ing a byte or a page write operation directly to any
address in the CCR. Prior to writing to the CCR
(except the status register), however, the WEL and
RWEL bits must be set using a two step process (See
section “Writing to the Clock/Control Registers.”)
The CCR is divided into 5 sections. These are:
1. Alarm 0 (8 bytes; non-volatile)
2. Alarm 1 (8 bytes; non-volatile)
3. Control (4 bytes; non-volatile)
4. Real Time Clock (8 bytes; volatile)
5. Status (1 byte; volatile)
V
BACK
In
Voltage
V
CC
On
Off
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| X1227V8IZ-4.5A | 16 Characters x 1 Lines, 5x7 Dot Matrix Character and Cursor |
| X1227V8I-2.7 | RTC Module With CPU Supervisor |
| X1227S8Z-2.7A | RTC Module With CPU Supervisor |
| X1227S8IZ-2.7 | RTC Module With CPU Supervisor |
| X1227V8IZ-2.7 | RTC Module With CPU Supervisor |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| X1228 | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:Real Time Clock/Calendar/CPU Supervisor with EEPROM |
| X1228_06 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Real Time Clock/Calendar/CPU Supervisor with EEPROM |
| X1228EVM | 制造商:Intersil Corporation 功能描述:A Evaluation Board (Connecting to X1228 Through PIC16C57 MCU,and Testing All Functions,Including Settings of Time,Alarm,Programmable Frequency Output,Digital/Analog Tuning,Watchdog and Reset Threshold),and A Development Data CD 制造商:Intersil Corporation 功能描述:A Evaluation Board (Connecting to X1228 Through PIC16C57 MCU, and Testing All Functions, Including Settings of Time, Alarm, Programmable Frequency Output, Digital/Analog Tuning, Watchdog and Reset Threshold), and A Development Data CD |
| X1228S14 | 功能描述:IC RTC CPU SUP WDT 4K EE 14-SOIC RoHS:否 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 |
| X1228S14-2.7 | 功能描述:IC RTC CPU SUP WDT 4K EE 14-SOIC RoHS:否 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 |
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