参数资料
| 型号： | DS3231S# |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/20页 |
| 文件大小： | 0K |
| 描述： | IC RTC W/TCXO 16-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 45 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，闰年，方波输出，TCXO/晶体 |
| 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： | 2.3 V ~ 5.5 V |
| 电压 - 电源，电池： | 2.3 V ~ 5.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 管件 |
| 产品目录页面： | 1434 (CN2011-ZH PDF) |
Extremely Accurate I2C-Integrated
RTC/TCXO/Crystal
10
Maxim Integrated
DS3231
32kHz TCXO
The temperature sensor, oscillator, and control logic
form the TCXO. The controller reads the output of the
on-chip temperature sensor and uses a lookup table to
determine the capacitance required, adds the aging
correction in AGE register, and then sets the capaci-
tance selection registers. New values, including
changes to the AGE register, are loaded only when a
change in the temperature value occurs, or when a
user-initiated temperature conversion is completed.
Temperature conversion occurs on initial application of
VCC and once every 64 seconds afterwards.
Power Control
This function is provided by a temperature-compensat-
ed voltage reference and a comparator circuit that
monitors the VCC level. When VCC is greater than VPF,
the part is powered by VCC. When VCC is less than VPF
but greater than VBAT, the DS3231 is powered by VCC.
If VCC is less than VPF and is less than VBAT, the
device is powered by VBAT. See Table 1.
To preserve the battery, the first time VBAT is applied to
the device, the oscillator will not start up until VCC
exceeds VPF, or until a valid I2C address is written to
the part. Typical oscillator startup time is less than one
second. Approximately 2 seconds after VCC is applied,
or a valid I2C address is written, the device makes a
temperature measurement and applies the calculated
correction to the oscillator. Once the oscillator is run-
ning, it continues to run as long as a valid power
source is available (VCC or VBAT), and the device con-
tinues to measure the temperature and correct the
oscillator frequency every 64 seconds.
On the first application of power (VCC) or when a valid
I2C address is written to the part (VBAT), the time and
date registers are reset to 01/01/00 01 00:00:00
(DD/MM/YY DOW HH:MM:SS).
VBAT Operation
There are several modes of operation that affect the
amount of VBAT current that is drawn. While the device
is powered by VBAT and the serial interface is active,
active battery current, IBATA, is drawn. When the serial
interface is inactive, timekeeping current (IBATT), which
includes the averaged temperature conversion current,
IBATTC, is used (refer to Application Note 3644: Power
Considerations for Accurate Real-Time Clocks for
details). Temperature conversion current, IBATTC, is
specified since the system must be able to support the
periodic higher current pulse and still maintain a valid
voltage level. Data retention current, IBATTDR, is the
current drawn by the part when the oscillator is
stopped (
EOSC = 1). This mode can be used to mini-
mize battery requirements for times when maintaining
time and date information is not necessary, e.g., while
the end system is waiting to be shipped to a customer.
Pushbutton Reset Function
The DS3231 provides for a pushbutton switch to be
connected to the
RST output pin. When the DS3231 is
not in a reset cycle, it continuously monitors the
RST
signal for a low going edge. If an edge transition is
detected, the DS3231 debounces the switch by pulling
the
RST low. After the internal timer has expired
(PBDB), the DS3231 continues to monitor the RST line.
If the line is still low, the DS3231 continuously monitors
the line looking for a rising edge. Upon detecting
release, the DS3231 forces the
RST pin low and holds it
low for tRST.
RST is also used to indicate a power-fail condition.
When VCC is lower than VPF, an internal power-fail sig-
nal is generated, which forces the
RST pin low. When
VCC returns to a level above VPF, the RST pin is held
low for approximately 250ms (tREC) to allow the power
supply to stabilize. If the oscillator is not running (see
the
Power Control section) when VCC is applied, tREC is
bypassed and
RST immediately goes high. Assertion of
the
RST output, whether by pushbutton or power-fail
detection, does not affect the internal operation of the
DS3231.
Real-Time Clock
With the clock source from the TCXO, the RTC provides
seconds, minutes, hours, day, date, month, and year
information. The date at the end of the month is auto-
matically adjusted for months with fewer than 31 days,
including corrections for leap year. The clock operates
in either the 24-hour or 12-hour format with an
AM/PM
indicator.
The clock provides two programmable time-of-day
alarms and a programmable square-wave output. The
INT/SQW pin either generates an interrupt due to alarm
condition or outputs a square-wave signal and the
selection is controlled by the bit INTCN.
SUPPLY CONDITION
ACTIVE SUPPLY
VCC < VPF, VCC < VBAT
VBAT
VCC < VPF, VCC > VBAT
VCC
VCC > VPF, VCC < VBAT
VCC
VCC > VPF, VCC > VBAT
VCC
Table 1. Power Control
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS3231S# | 功能描述:实时时钟 Integrated RTC/TCXO/Crystal 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 |
| DS3231S#T&R | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 16SOIC W - Tape and Reel 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 16SOIC W - Cut TR (SOS) 制造商:Maxim Integrated Products 功能描述:IC RTC W/TCXO 16-SOIC 制造商:Maxim Integrated Products 功能描述:Real Time Clock Integrated RTC/TCXO/Crystal |
| DS3231S#T&R | 功能描述:实时时钟 Integrated RTC/TCXO/Crystal 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 |
| DS3231S#-W | 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 |
| DS3231S/T&R | 制造商:Maxim Integrated Products 功能描述:I2C-INTEGRATED RTC/TCXO/CRYSTAL SOIC16 - Tape and Reel 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:IC RTC W/TCXO 16SOIC 制造商:Maxim Integrated Products 功能描述:Real Time Clock Integrated RTC/TCXO/Crystal |
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