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參數(shù)資料
| 型號： | DS1388Z-3+T&R |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 2/19頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC RTC I2C W/CHARGER 8-SOIC |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 類型： | 時鐘/日歷 |
| 特點： | EEPROM，閏年，監(jiān)控器，涓流充電器，監(jiān)視計時器 |
| 存儲容量： | 512B |
| 時間格式： | HH:MM:SS:hh（12/24 小時） |
| 數(shù)據(jù)格式： | YY-MM-DD-dd |
| 接口： | I²C，2 線串口 |
| 電源電壓： | 2.7 V ~ 3.3 V |
| 電壓 - 電源，電池： | 1.3 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 8-SOIC |
| 包裝： | 帶卷 (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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| DS1388Z-5 | 功能描述:實時時鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1388Z-5+ | 功能描述:實時時鐘 I2C RTC/Supervisor w/Trickle Charger RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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| DS1390_07 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Low-Voltage SPI/3-Wire RTCs with Trickle Charger |
| DS1390_09 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Low-Voltage SPI/3-Wire RTCs with Trickle Charger |
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