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參數(shù)資料
| 型號： | X1228S14-4.5A |
| 元件分類： | CPU監(jiān)測 |
| 英文描述： | RTC Module With CPU Supervisor |
| 中文描述： | 時鐘模塊CPU監(jiān)控 |
| 文件頁數(shù)： | 9/31頁 |
| 文件大小： | 569K |
| 代理商： | X1228S14-4.5A |
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X1228
REV 1.3 3/24/04
Characteristics subject to change without notice.
9 of 31
www.xicor.com
DESCRIPTION
The X1228 device is a Real Time Clock with clock/
calendar, two polled alarms with integrated 512x8
EEPROM, oscillator compensation, CPU Supervisor
(POR/LVS and WDT) and battery backup switch.
The oscillator uses an external, low-cost 32.768kHz
crystal. All compensation and trim components are
integrated on the chip. This eliminates several external
discrete components and a trim capacitor, saving
board area and component cost.
The Real-Time Clock keeps track of time with separate
registers for Hours, Minutes, Seconds. The Calendar
has separate registers for Date, Month, Year and Day-
of-week. The calendar is correct through 2099, with
automatic leap year correction.
The powerful Dual Alarms can be set to any Clock/
Calendar value for a match. For instance, every
minute, every Tuesday, or 5:23 AM on March 21. The
alarms can be polled in the Status Register or provide
a hardware interrupt (IRQ Pin). There is a repeat
mode for the alarms allowing a periodic interrupt.
The PHZ/IRQ pin may be software selected to provide
a frequency output of 1 Hz, 4096 Hz, or 32,768 Hz.
The X1228 device integrates CPU Supervisor func-
tions and a Battery Switch. There is a Power-On Reset
(RESET output) with typically 250 ms delay from
power on. It will also assert RESET when Vcc goes
below the specified threshold. The V
trip
threshold is
user repro-grammable. There is a WatchDog Timer
(WDT) with 3 selectable time-out periods (0.25s,
0.75s, 1.75s) and a disabled setting. The watchdog
activates the RESET pin when it expires.
The device offers a backup power input pin. This
V
BACK
pin allows the device to be backed up by battery
or SuperCap. The entire X1228 device is fully
operational from 2.7 to 5.5 volts and the clock/calendar
portion of the X1228 device remains fully operational
down to 1.8 volts (Standby Mode).
The X1228 device provides 4K bits of EEPROM with 8
modes of BlockLock control. The BlockLock allows a
safe, secure memory for critical user and configuration
data, while allowing a large user storage area.
PIN DESCRIPTIONS
Serial Clock (SCL)
The SCL input is used to clock all data into and out of
the device. The input buffer on this pin is always active
(not gated).
Serial Data (SDA)
SDA is a bidirectional pin used to transfer data into and
out of the device. It has an open drain output and may
be wire ORed with other open drain or open collector
outputs. The input buffer is always active (not gated).
An open drain output requires the use of a pull-up
resistor. The output circuitry controls the fall time of the
output signal with the use of a slope controlled pull-
down. The circuit is designed for 400kHz 2-wire inter-
face speeds.
V
BACK
This input provides a backup supply voltage to the
device. V
BACK
supplies power to the device in the
event the V
CC
supply fails. This pin can be connected
to a battery, a Supercap or tied to ground if not used.
RESET Output – RESET
This is a reset signal output. This signal notifies a host
processor that the watchdog time period has expired or
that the voltage has dropped below a fixed V
TRIP
thresh-
old. It is an open drain active LOW output. Recom-
mended value for the pullup resistor is 5K Ohms. If
unused, tie to ground.
Programmable Frequency/Interrupt Output – PHZ/IRQ
This is either an output from the internal oscillator or an
interrupt signal output. It is a CMOS output.
When used as frequency output, this signal has a fre-
quency of 32.768kHz, 4096Hz, 1Hz or inactive.
When used as interrupt output, this signal notifies a
host processor that an alarm has occurred and an
action is required. It is an active LOW output.
NC = No internal connection
X1228
NC
NC
NC
X1
X2
1
2
3
4
5
6
7
13
12
11
10
14
14-Pin TSSOP/SOIC
9
8
RESET
V
SS
V
CC
V
PHZ/IRQ
NC
NC
SCL
SDA
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| X1228S14I | 功能描述:IC RTC/CAL/CPU SUP EE 14-SOIC RoHS:否 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(biāo)準(zhǔn)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 |
| X1228S14I-2.7 | 功能描述:IC RTC/CAL/CPU SUP EE 14-SOIC RoHS:否 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(biāo)準(zhǔn)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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