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参数资料
| 型号： | DS1388Z-3+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/19页 |
| 文件大小： | 0K |
| 描述： | IC RTC I2C W/CHARGER 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 时钟/日历 |
| 特点： | EEPROM，闰年，监控器，涓流充电器，监视计时器 |
| 存储容量： | 512B |
| 时间格式： | HH:MM:SS:hh（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 ~ 3.3 V |
| 电压 - 电源，电池： | 1.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
I2C RTC/Supervisor with Trickle Charger
and 512 Bytes EEPROM
10
Maxim Integrated
DS1388
Clock Accuracy
The accuracy of the clock is dependent upon the accu-
racy of the crystal and the accuracy of the match
between the capacitive load of the oscillator circuit and
the capacitive load for which the crystal was trimmed.
Additional error is added by crystal frequency drift
caused by temperature shifts. External circuit noise
coupled into the oscillator circuit can result in the clock
running fast. Figure 3 shows a typical PC board layout
for isolation of the crystal and oscillator from noise.
Refer to Application Note 58:
Crystal Considerations
with Dallas Real-Time Clocks for detailed information.
Address Map
Figure 4 shows the address map for the DS1388. The
memory map is divided into three blocks. The memory
block accessed is determined by the value of the block
address bits in the slave address byte. The timekeep-
ing registers reside in block 0h. During a multibyte
access of the timekeeping registers, when the internal
address pointer reaches 0Ch, it wraps around to loca-
tion 00h. On an I2C START or address pointer incre-
menting to location 00h, the current time is transferred
to a second set of registers. The time information is
read from these secondary registers, while the clock
may continue to run. This eliminates the need to reread
the registers in case the main registers update during a
read. The EEPROM is divided into two 256-byte blocks
located in blocks 1h and 2h. During a multibyte read of
the EEPROM registers, when the internal address point-
er reaches FFh, it wraps around to location 00h of the
block of EEPROM specified in the block address.
During a multibyte write of the EEPROM registers, when
the internal address pointer reaches the end of the cur-
rent 8-byte EEPROM page, it wraps around to the
beginning of the EEPROM page. See the
Write
Operation section for details.
To avoid rollover issues when writing to the time and
date registers, all registers should be written before the
hundredths-of-seconds register reaches 99 (BCD).
Hundredths-of-Seconds
Generator
The hundredths-of-seconds generator circuit shown in
the
Block Diagram is a state machine that divides the
incoming frequency (4096Hz) by 41 for 24 cycles and
40 for 1 cycle. This produces a 100Hz output that is
slightly off during the short term, and is exactly correct
every 250ms. The divide ratio is given by:
Ratio = [41 x 24 + 40 x 1] / 25 = 40.96
Thus, the long-term average frequency output is
exactly 100Hz.
LOCAL GROUND PLANE (LAYER 2)
CRYSTAL
GND
X2
X1
NOTE: AVOID ROUTING SIGNAL LINES
IN THE CROSSHATCHED AREA
(UPPER LEFT QUADRANT) OF
THE PACKAGE UNLESS THERE IS
A GROUND PLANE BETWEEN THE
SIGNAL LINE AND THE DEVICE PACKAGE.
Figure 3. Layout Example
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相关代理商/技术参数 |
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| DS1388Z-5 | 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 |
| DS1388Z-5+ | 功能描述:实时时钟 I2C RTC/Supervisor w/Trickle Charger 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 |
| DS1390 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Voltage SPI/3-Wire RTCs with Trickle Charger |
| DS1390_07 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Voltage SPI/3-Wire RTCs with Trickle Charger |
| DS1390_09 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Voltage SPI/3-Wire RTCs with Trickle Charger |
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