Datasheet > 微控制器和处理器 > 计时器或实时时钟> X1288S16I

X1288S16I

更新时间： 2024-01-11 01:15:24

品牌	Logo	应用领域
XICOR		计时器或实时时钟微控制器和处理器外围集成电路光电二极管监控可编程只读存储器电动程控只读存储器电可擦编程只读存储器
页数	文件大小	规格书
31页	559K
描述
2-Wire RTC Real Time Clock/Calendar/CPU Supervisor with EEPROM

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中文翻译

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技术参数
数据手册

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X1288S16I 技术参数

是否Rohs认证：	不符合	生命周期：	Transferred
包装说明：	0.300 INCH, PLASTIC, SOIC-16	Reach Compliance Code：	unknown
风险等级：	5.71	Is Samacsys：	N
最大时钟频率：	0.032 MHz	信息访问方法：	I2C
中断能力：	Y	JESD-30 代码：	R-PDSO-G16
JESD-609代码：	e0	长度：	10.35 mm
端子数量：	16	计时器数量：	1
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装等效代码：	SOP16,.4	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	电源：	5 V
认证状态：	Not Qualified	座面最大高度：	2.65 mm
子类别：	Timer or RTC	最大供电电压：	5.5 V
最小供电电压：	4.5 V	标称供电电压：	5 V
表面贴装：	YES	技术：	CMOS
温度等级：	INDUSTRIAL	端子面层：	Tin/Lead (Sn/Pb)
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	最短时间：	1/100 SECOND
易失性：	YES	宽度：	7.5 mm
uPs/uCs/外围集成电路类型：	TIMER, REAL TIME CLOCK	Base Number Matches：	1

X1288S16I 数据手册

Preliminary Information

X1288

A ﬁnal application for the ATR control is in-circuit cali-

bration for high accuracy applications, along with a

temperature sensor chip. Once the RTC circuit is pow-

ered up with battery backup, the PHZ output is set at

32.768kHz and frequency drift is measured. The ATR

control is then adjusted to a setting which minimizes

drift. Once adjusted at a particular temperature, it is

possible to adjust at other discrete temperatures for

minimal overall drift, and store the resulting settings in

the EEPROM. Extremely low overall temperature drift

is possible with this method. The Xicor evaluation

board contains the circuitry necessary to implement

this control.

ity of the RTC device. A small decoupling capacitor at

the Vcc pin of the chip is mandatory, with a solid con-

nection to ground.

The X1286 product has a special consideration. The

PHZ/IRQ- pin on the 8-lead SOIC package is located

next to the X2 pin. When this pin is used as a fre-

quency output (PHZ) and is set to 32.768kHz output

frequency, noise can couple to the X1 or X2 pins and

cause double-clocking. The layout in ﬁgure 19 can help

minimize this by running the PHZ output away from the

X1 and X2 pins. Also, minimizing the switching current

at this pin by careful selection of the pullup resistor

value will reduce noise. Xicor suggests a minimum

value of 5.1k for 32.768kHz, and higher values (i.e.

20kΩ) for lower frequency PHZ outputs.

For more detailed operation see Xicor’s application

note AN154 on Xicor’s website at www.xicor.com.

For other RTC products, the same rules stated above

should be observed, but adjusted slightly since the

packages and pinouts are slightly different.

Layout Considerations

The crystal input at X1 has a very high impedance and

will pick up high frequency signals from other circuits

on the board. Since the X2 pin is tied to the other side

of the crystal, it is also a sensitive node. These signals

can couple into the oscillator circuit and produce dou-

ble clocking or mis-clocking, seriously affecting the

accuracy of the RTC. Care needs to be taken in layout

of the RTC circuit to avoid noise pickup. Below in Fig-

ure 19 is a suggested layout for the X1286 or X1288

devices.

Assembly

Most electronic circuits do not have to deal with

assembly issues, but with the RTC devices assembly

includes insertion or soldering of a live battery into an

unpowered circuit. If a socket is soldered to the board,

and a battery is inserted in ﬁnal assembly, then there

are no issues with operation of the RTC. If the battery

is soldered to the board directly, then the RTC device

Vback pin will see some transient upset from either sol-

dering tools or intermittent battery connections which

can stop the circuit from oscillating. Once the battery is

soldered to the board, the only way to assure the circuit

will start up is to momentarily (very short period of

time!) short the Vback pin to ground and the circuit will

begin to oscillate.

Figure 19. Suggested Layout for Xicor RTC in SO-8

3.1µF

Oscillator Measurements

When a proper crystal is selected and the layout guide-

lines above are observed, the oscillator should start up

in most circuits in less than one second. Some circuits

may take slightly longer, but startup should deﬁnitely

occur in less than 5 seconds. When testing RTC cir-

cuits, the most common impulse is to apply a scope

probe to the circuit at the X2 pin (oscillator output) and

observe the waveform. DO NOT DO THIS! Although in

some cases you may see a useable waveform, due to

the parasitics (usually 10pF to ground) applied with the

R1 13k

XTAL1

X1286/X1288

±2.768kGz

The X1 and X2 connections to the crystal are to be

kept as short as possible. A thick ground trace around

the crystal is advised to minimize noise intrusion, but

ground near the X1 and X2 pins should be avoided as

it will add to the load capacitance at those pins. Keep in

mind these guidelines for other PCB layers in the vicin-

26 of 31

REV 1.1.30 3/24/04

www.xicor.com

1...23 24 252627 28 29...31

中文翻译

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与X1288S16I相关器件

型号	品牌	获取价格	描述	数据表
X1288S16I-2.7	XICOR	获取价格	2-Wire RTC Real Time Clock/Calendar/CPU Supervisor with EEPROM
X1288S16I-2.7	INTERSIL	获取价格	2-Wire⑩ RTC Real Time Clock/Calendar/CPU Supe
X1288S16I-2.7A	INTERSIL	获取价格	2-Wire⑩ RTC Real Time Clock/Calendar/CPU Supe
X1288S16I-2.7A	XICOR	获取价格	2-Wire RTC Real Time Clock/Calendar/CPU Supervisor with EEPROM
X1288S16I-2.7AT1	RENESAS	获取价格	1 TIMER(S), REAL TIME CLOCK, PDSO16, 0.300 INCH, PLASTIC, SOIC-16
X1288S16I-2.7T1	RENESAS	获取价格	1 TIMER(S), REAL TIME CLOCK, PDSO16, 0.300 INCH, PLASTIC, SOIC-16
X1288S16I-4.5A	INTERSIL	获取价格	2-Wire⑩ RTC Real Time Clock/Calendar/CPU Supe
X1288S16I-4.5A	XICOR	获取价格	2-Wire RTC Real Time Clock/Calendar/CPU Supervisor with EEPROM
X1288S16IT1	RENESAS	获取价格	1 TIMER(S), REAL TIME CLOCK, PDSO16, 0.300 INCH, PLASTIC, SOIC-16
X1288V14	INTERSIL	获取价格	2-Wire⑩ RTC Real Time Clock/Calendar/CPU Supe

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