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参数资料
| 型号： | DS1244W-120IND |
| 英文描述： | 256k NV SRAM with Phantom Clock |
| 中文描述： | 256k非易失SRAM与幻影时钟 |
| 文件页数： | 12/19页 |
| 文件大小： | 292K |
| 代理商： | DS1244W-120IND |
ADS1244
SBAS273
12
www.ti.com
FIGURE 14. Self-Calibration Timing.
23
DRDY/DOUT
SCLK
1
24
t
9
25
26
23
22
21
0
Data ready after cal.
Cal begins.
SYMBOL
DESCRIPTION
MIN
MAX
UNITS
t
9(1)
First data ready after calibration.
209
210
ms
NOTE: (1) Values given for f
CLK
= 2.4576MHz. For different CLK frequencies, scale proportional to CLK
period.
SELF-CALIBRATION
The user can initiate self-calibration at any time, though in
many applications the ADS1244
’
s drift performance is good
enough that the self-calibration performing automatically at
power-up is all that is needed. To initiate a self-calibration,
apply at least two additional SCLKs after retrieving 24 bits of
data. Figure 14 shows the timing pattern. The 25th SCLK will
send
DRDY/DOUT
HIGH. The falling edge of the 26th SCLK
will begin the calibration cycle. Additional SCLK pulses may
be sent after the 26th SCLK, but try to minimize activity on
SCLK during calibration for best results.
When the calibration is complete,
DRDY/DOUT
will go LOW
indicating that new data is ready. There is no need to alter the
analog input signal applied to the ADS1244 during calibration,
the inputs pins are disconnected within the A/D converter and
the appropriate signals applied internally automatically. The
first conversion after a calibration is fully settled and valid for
use. The time required for a calibration depends on two
independent signals: the falling edge of SCLK and an internal
clock derived from CLK. Variations in the internal calibration
values will change the time required for calibration (t
9
) within
the range given by the MIN/MAX specs. t
12
and t
13
described
in the next section are affected likewise.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1244W-120IND+ | 功能描述:实时时钟 256k NV SRAM w/Phantom Clock 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 |
| DS1244WP-120 | 功能描述:实时时钟 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 |
| DS1244WP-120+ | 功能描述:实时时钟 256k NV SRAM w/Phantom Clock 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 |
| DS1244WP-120IND | 功能描述:IC NVSRAM 256KBIT 120NS 34PCM 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 |
| DS1244WP-120IND+ | 功能描述:实时时钟 256k NV SRAM w/Phantom Clock 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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