参数资料
| 型号： | ISL1209IU10Z |
| 厂商： | Intersil |
| 文件页数： | 7/24页 |
| 文件大小： | 0K |
| 描述： | IC RTC LP BATT BACK SRAM 10MSOP |
| 标准包装： | 80 |
| 类型： | 时间事件记录器 |
| 特点： | 警报器，闰年，SRAM |
| 存储容量： | 2B |
| 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： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 管件 |
| 产品目录页面： | 1245 (CN2011-ZH PDF) |
15
FN6109.4
October 17, 2006
EVENT INPUT TIME BASE HYSTERESIS SELECTION
BITS (EHYS<1:0>)
These two bits select the time base hysteresis of the EVIN
pin to filter bouncing or noise of external event detection
circuits. The time filter can be set between 0 to 31.25 ms.
EVENT DETECT ENABLE BIT (EVEN)
This bit enables/disables the Event Detect function of the
ISL1209. When this bit is set to “1”, the Event Detect is
active. When this bit is cleared to “0”, the Event Detect is
disabled.
RTC HALT ON EVENT DETECT BIT (RTCHLT)
This bit sets the RTC registers to continue or halt counting
upon an Event Detect triggered by the EV pin. The time
keeping function will cease when RTCHLT is set to “1”, the
RTC will discontinue incrementing if an event is detected.
Counting will resume when there is a valid write to the to the
RTC registers (i.e. time set). The RTCHLT is cleared to “0”
after the write to the RTC registers.
Note: This function requires that the event detection is
enabled (see EVEN bit).
EVENT OUTPUT IN BATTERY MODE ENABLE BIT
(EVBATB)
This bit enables/disables the EVDET pin during battery
backup mode (i.e. VBAT pin supply ON). When the EVBATB
is set to “1”, the Event Detect Output is disabled in battery
backup mode. When the EVBATB is cleared to “0”, the Event
Detect output is enabled in battery backup mode.This
feature can be used to save power during battery mode.
EVENT CURRENT SOURCE ENABLE BIT (EVIENB)
This bit enables/disables the internal pullup current source
used for the EVIN pin. When the EVIENB bit is set to “1”, the
pullup current source is always disabled. When the EVIENB
bit is cleared to “0”, the pullup current source is enabled
(current source is approximately 1A).
Analog Trimming Register
ANALOG TRIMMING REGISTER (ATR<5:0>)
Six analog trimming bits, ATR0 to ATR5, are provided in
order to adjust the on-chip load capacitance value for
frequency compensation of the RTC. Each bit has a different
weight for capacitance adjustment. For example, using a
Citizen CFS-206 crystal with different ATR bit combinations
provides an estimated ppm adjustment range from -34 to
+80ppm to the nominal frequency compensation. The
combination of analog and digital trimming can give up to -94
to +140ppm of total adjustment.
The effective on-chip series load capacitance, CLOAD,
ranges from 4.5pF to 20.25pF with a mid-scale value of
12.5pF (default). CLOAD is changed via two digitally
controlled capacitors, CX1 and CX2, connected from the X1
and X2 pins to ground (see Figure 11). The value of CX1 and
CX2 is given by the following formula:
The effective series load capacitance is the combination of
CX1 and CX2:
For example, CLOAD(ATR=00000) = 12.5pF,
CLOAD(ATR=100000) = 4.5pF, and CLOAD(ATR=011111) =
20.25pF. The entire range for the series combination of load
capacitance goes from 4.5pF to 20.25pF in 0.25pF steps.
Note that these are typical values.
BATTERY MODE ATR SELECTION (BMATR <1:0>)
Since the accuracy of the crystal oscillator is dependent on
the VDD/VBAT operation, the ISL1209 provides the capability
to adjust the capacitance between VDD and VBAT when the
device switches between power sources.
TABLE 11.
EHYS1
EHYS0
Time Base Hysteresis
0
0 (pullup always on)
0
1
3.9ms
1
0
15.625ms
1
31.25ms
NOTE: In order to use time-based hysteresis, the sampling mode
must be enabled.
FIGURE 11. DIAGRAM OF ATR
CX1
X1
X2
Crystal
Oscillator
CX2
C
X
16 b5
8b4
4 b3
2b2
1 b1
0.5b0
9
+
+
+
+
+
+
()pF
=
C
LOAD
1
C
X1
-----------
1
C
X2
-----------
+
-----------------------------------
=
C
LOAD
16 b5
8b4
4 b3
2b2
1 b1
0.5 b0
9
+
+
+
+
+
+
2
-----------------------------------------------------------------------------------------------------------------------------
pF
=
ISL1209
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相关代理商/技术参数 |
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| ISL1209IU10Z-TK | 功能描述:实时时钟 I2CAL TIME CLK/CLNDR W/EVENT DETCT 10LD RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| ISL1218 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Low Power RTC with Battery Backed SRAM |
| ISL1218IBZ | 功能描述:实时时钟 REAL TIME CLKRTC IN 8LD RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| ISL1218IBZ-T | 功能描述:实时时钟 REAL TIME CLKRTC IN 8LD RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| ISL1218IUZ | 功能描述:实时时钟 REAL TIME CLKRTC IN RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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