参数资料
| 型号： | X1226V8ZT1 |
| 厂商： | Intersil |
| 文件页数： | 15/25页 |
| 文件大小： | 0K |
| 描述： | IC RTC/CALENDAR/4K EE 8-TSSOP |
| 标准包装： | 2,500 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，闰年 |
| 时间格式： | HH:MM:SS（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | I²C，2 线串口 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 电压 - 电源，电池： | 1.8 V ~ 5.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 8-TSSOP |
| 包装： | 带卷 (TR) |
22
FN8098.3
May 8, 2006
The best way to analyze the RTC circuit is to power it
up and read the real time clock as time advances, or if
the chip has the PHZ output, look at the output of that
pin on an oscilloscope (after enabling it with the con-
trol register, and using a pullup resistor for an open-
drain output). Alternaltively, the X1226 device has an
IRQ- output which can be checked by setting an alarm
for each minute. Using the pulse interrupt mode set-
ting, the once-per-minute interrupt functions as an
indication of proper oscillation.
Backup Battery Operation
Many types of batteries can be used with the Intersil
RTC products. 3.0V or 3.6V Lithium batteries are
appropriate, and sizes are available that can power a
Intersil RTC device for up to 10 years. Another option
is to use a supercapacitor for applications where Vcc
may disappear intermittently for short periods of time.
Depending on the value of supercapacitor used,
backup time can last from a few days to two weeks
(with >1F). A simple silicon or Schottky barrier diode
can be used in series with Vcc to charge the superca-
pacitor, which is connected to the Vback pin. Do not
use the diode to charge a battery (especially lithium
batteries!).
Figure 16. Supercapactor charging circuit
Since the battery switchover occurs at Vcc = Vback-
0.1V (see Figure 16), the battery voltage must always
be lower than the Vcc voltage during normal operation
or the battery will be drained.
The summary of conditions for backup battery opera-
tion is given in Table 8:
Table 8. Battery Backup Operation
*since Vback>2.65V is higher than Vtrip, the battery is powering the entire device
2.7-5.5V
Supercapacitor
VSS
VCC
Vback
1. Example Application, Vcc=5V, Vback=3.0V
Condition
Vcc
Vback
Vtrip
Iback
Notes
a. Normal Operation
5.00
3.00
4.38
<<1A
b. Vcc on with no battery
5.00
0
4.38
0
c. Backup Mode
0–1.8
1.8-3.0
4.38
<2A
Timekeeping only
2. Example Application, Vcc=3.3V,Vback=3.0V
Condition
Vcc
Vback
Vtrip
Iback
a. Normal Operation
3.30
3.00
2.65
<<1A
b. Vcc on with no battery
3.30
0
2.65
0
c. Backup Mode
0–1.8
1.8–3.0*
2.65
<2A*
Timekeeping only
d. UNWANTED - Vcc ON, Vback
powering
2.65 - 3.30
> Vcc
2.65
up to 3mA
Internal
Vcc = Vback
X1226
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