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参数资料
| 型号： | X1203S8T1 |
| 元件分类： | XO, clock |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 封装： | PLASTIC, SOIC-8 |
| 文件页数： | 12/19页 |
| 文件大小： | 155K |
| 代理商： | X1203S8T1 |
X1203
Characteristics subject to change without notice.
2 of 19
REV 1.2.0 2/13/01
www.xicor.com
PIN CONFIGURATION
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.
VBACK
This input provides a backup supply voltage to the
device. VBACK supplies power to the device in the
event the VCC supply fails.
Interrupt Output - IRQ
This is an interrupt signal output. This signal noties a
host processor that alarm has occurred and requests
action. It is an open drain active LOW output.
X1, X2
The X1 and X2 pins are the input and output, respec-
tively, of an inverting amplier that can accept an external
32.768kHz square wave reference on X1 or can be con-
gured for use as an on-chip oscillator. A 32.768kHz
quartz crystal such as a Citizen CFS-206 is used with the
on-chip oscillator. The crystal supplies a timebase for a
clock/oscillator, see gure 1. Using an external time-
base, the internal clock is driven by the external signal
on X1, with X2 left unconnected.
Figure 1. Recommended Crystal Connection
POWER CONTROL OPERATION
The Power control circuit accepts a VCC and a VBACK
input. The power control circuit will switch to VBACK
when VCC < VBACK – 0.2V. It will switch back to VCC
when VCC exceeds VBACK.
Figure 2. Power Control
REAL TIME CLOCK OPERATION
The Real Time Clock (RTC) uses an external 32.768kHz
quartz crystal network or timebase to maintain an
accurate internal representation of the year, month,
day, date, hour, minute, and seconds. The RTC has
leap-year correction and a century byte. The clock will
also correct for months having fewer than 31 days and
will have a bit that controls 24-hour or AM/PM format.
After power up, when both VCC and VBACK fail, the
clock will not advance unless at least one byte is written
to the RTC register.
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 contin-
uously and a read takes a nite amount of time, there
is the possibility that the clock could change during the
X1203
X1
X2
VBACK
VCC
IRQ
SCL
SDA
VSS
1
2
3
4
7
8
6
5
8-Pin TSSOP
X1203
X1
X2
VBACK
VCC
IRQ
SCL
SDA
VSS
1
2
3
4
7
8
6
5
8-Pin SOIC
X1
X2
68pF
12pF
360K
10M
VBACK
VCC = VBACK -0.2V
Internal
Voltage
VCC
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相关代理商/技术参数 |
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| X1205S8 | 功能描述:IC RTC/CALENDAR 2-WIRE 8-SOIC RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 实时时钟 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 类型:时钟/日历 特点:警报器，闰年，SRAM 存储容量:- 时间格式:HH:MM:SS（12/24 小时） 数据格式:YY-MM-DD-dd 接口:SPI 电源电压:2 V ~ 5.5 V 电压 - 电源，电池:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WDFN 裸露焊盘 供应商设备封装:8-TDFN EP 包装:管件 |
| X1205S8I | 功能描述:IC RTC/CALENDAR 2-WIRE 8-SOIC RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 实时时钟 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 类型:时钟/日历 特点:警报器，闰年，SRAM 存储容量:- 时间格式:HH:MM:SS（12/24 小时） 数据格式:YY-MM-DD-dd 接口:SPI 电源电压:2 V ~ 5.5 V 电压 - 电源，电池:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WDFN 裸露焊盘 供应商设备封装:8-TDFN EP 包装:管件 |
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