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参数资料
| 型号： | DS1244Y-70 |
| 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： | 10/19页 |
| 文件大小： | 292K |
| 代理商： | DS1244Y-70 |
ADS1244
SBAS273
10
www.ti.com
POWER-UP
Self-calibration is performed at power-up to minimize offset and
gain errors. In order for the self-calibration at power-up to work
properly, make sure that both AVDD and DVDD increase
monotonically and are settled by t
1
, as shown in Figure 11.
SCLK must be held LOW during this time. Once calibration is
complete,
DRDY/DOUT
will go LOW indicating data is ready
for retrieval. The time required before the first data is ready (t
6
)
depends on how fast AVDD and DVDD ramp to their final value
(t
1
). For most ramp rates, t
1
+ t
2
≈
350ms (f
CLK
= 2.4576MHz).
If the system environment is not stable during power-up (the
temperature is varying or the supply voltages are moving
around), it is recommended that a self-calibration be issued
after everything is stable.
DATA FORMAT
The ADS1244 outputs 24 bits of data in Binary Two
’
s
Complement format. The Least Significant Bit (LSB) has a
weight of (2V
REF
)/(2
23
–
1). A positive full-scale input pro-
FIGURE 11. Power-Up Timing.
AVDD and DVDD
DRDY/DOUT
SCLK
t
1
t
2
Data ready after power-up calibration.
SYMBOL
DESCRIPTION
MIN
MAX
UNITS
t
1(1)
t
2(1)
AVDD and DVDD settling time.
Wait time for calibration and first data conversion.
100
ms
ms
316
NOTE: (1) Values given for f
CLK
= 2.4576MHz. For different CLK frequencies, scale proportional
to CLK period.
duces an output code of 7FFFFF
H
and the negative full-scale
input produces an output code of 800000
H
. The output clips
at these codes for signals exceeding full-scale. Table I
summarizes the ideal output codes for different input signals.
INPUT SIGNAL V
IN
(AINP
–
AINN)
≥
+2V
REF
+
2
2
0
2
2
IDEAL OUTPUT CODE
(1)
7FFFFF
H
1
23
V
REF
000001
H
000000
H
1
23
V
REF
FFFFFF
H
≤
2
2
23
2
1
23
V
REF
800000
H
NOTE: (1) Excludes effects of noise, INL, offset, and gain errors.
TABLE I. Ideal Output Code versus Input Signal.
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相关代理商/技术参数 |
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|---|---|
| DS1244Y-70+ | 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 |
| DS1244YP/WP | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:PowerCap with Crystal |
| DS1244YP-70 | 功能描述:IC NVSRAM 256KBIT 70NS 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 |
| DS1244YP-70+ | 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 |
| DS-1244ZJ | 制造商:Hikvision USA 功能描述:DOME CAM CEILING TRIM BRACKET4.75IN X .95IN 制造商:HIKVISION 功能描述:DOME CAM CEILING TRIM BRACKET 4.75IN X .95IN |
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