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参数资料
| 型号： | DS1372 |
| 厂商： | Maxim Integrated Products, Inc. |
| 元件分类： | 通用总线功能 |
| 英文描述： | I2C, 32-Bit, Binary Counter Clock with 64-Bit ID |
| 中文描述： | I²C、32位、二进制计数时钟，具有64位ID |
| 文件页数： | 8/12页 |
| 文件大小： | 173K |
| 代理商： | DS1372 |
D
Status Register (08h)
Bit 7: Oscillator Stop Flag (OSF).
A logic 1 in this bit
indicates that the oscillator either is stopped or was
stopped for some period of time and may be used to
judge the validity of the timekeeping data. This bit is set
to logic 1 anytime the oscillator stops. The following are
examples of conditions that can cause the OSF bit to
be set:
1) The first time power is applied.
2) The voltage present on V
CC
is insufficient to sup-
port oscillation.
3) The
EOSC
bit is turned off.
4) External influences on the crystal (i.e., noise, leak-
age, etc.) exist.
This bit remains at logic 1 until written to logic 0.
Bits 6 to 1:
These bits always read back as logic 0.
Bit 0: Alarm Flag (AF).
A logic 1 in the AF bit indicates
that the alarm counter reached zero. If the AIE and
INTCN bits are both set to logic 1, the SQW/
INT
pin
goes low and remains low until AF is written to logic 0.
This bit can only be written to logic 0. Attempting to
write logic 1 leaves the value unchanged.
ID Register
A unique 64-bit lasered serial number is located in the
address range 09h–10h. This serial number is divided
into three parts. The first byte in register 09h contains a
model number to identify the DS1372 device type.
Registers 0Ah–0Fh contain a unique binary number.
Register 10h contains a CRC byte used to validate the
data in registers 09h–0Fh. All eight bytes of the serial
number are read-only registers. The CRC byte is gener-
ated with the polynomial equal to x
8
+ x
5
+ x
4
+ 1 (see
Figure 3).
The DS1372 is manufactured such that no two devices
contain an identical number in locations 0Ah–0Fh.
I
2
C Serial Data Bus
The DS1372 supports a bidirectional I
2
C serial bus and
data transmission protocol (Figure 4). A device that
sends data onto the bus is defined as a transmitter,
and a device receiving data is defined as a receiver.
The device that controls the message is called a mas-
ter. The devices that are controlled by the master are
slaves. The bus must be controlled by a master device
that generates the serial clock (SCL), controls the
bus access, and generates the START and STOP
8
_______________________________________________________________________________________
Bit #
Name
Reset
7
6
0
0
5
0
0
4
0
0
3
0
0
2
0
0
1
0
0
0
OSF
1
AF
0
Status Register (08h)
1ST
STAGE
2ND
STAGE
3RD
STAGE
4TH
STAGE
7TH
STAGE
8TH
STAGE
6TH
STAGE
5TH
STAGE
X
0
X
1
X
2
X
3
X
4
POLYNOMIAL = X
8
+ X
5
+ X
4
+ 1
INPUT DATA
X
5
X
6
X
7
X
8
Figure 3. CRC Byte Polynomial
I
2
C, 32-Bit, Binary Counter Clock with 64-Bit ID
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相关代理商/技术参数 |
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|---|---|
| DS1372U+ | 功能描述:实时时钟 I2C 32 bit Binary Counter w/64 Bit ID 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 |
| DS1372U+T&R | 制造商:Maxim Integrated Products 功能描述:RTC W/SERIAL NUMBER - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC BINARY COUNTER 32-BIT 8-USOP |
| DS1372U+T&R | 功能描述:实时时钟 I2C 32 bit Binary Counter w/64 Bit ID 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 |
| DS1374 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:I2C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output |
| DS1374_10 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:I2C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output |
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