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參數(shù)資料
| 型號(hào)： | DS1672U-33+T&R |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 14/15頁(yè) |
| 文件大小： | 0K |
| 描述： | IC TIMEKEEPER 3.3V 32-BIT 8-USOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 類型： | 二進(jìn)制計(jì)數(shù)器 |
| 特點(diǎn)： | 涓流充電器 |
| 時(shí)間格式： | 二進(jìn)制 |
| 數(shù)據(jù)格式： | 二進(jìn)制 |
| 接口： | I²C，2 線串口 |
| 電源電壓： | 2.97 V ~ 3.63 V |
| 電壓 - 電源，電池： | 1.3 V ~ 3.63 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-uMAX |
| 包裝： | 帶卷 (TR) |
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DS1672
8 of 15
Detailed Description
The DS1672 provides a 32-bit counter that increments once-per-second. The counter data is accessible
via an I
2C serial interface. A precision, temperature-compensated, voltage reference and comparator
circuit monitors VCC. When VCC drops below VPF, RST becomes active and the interface is disabled to
prevent data corruption. The device switches to the backup supply input, which maintains oscillator and
counter operation while VCC is absent. When VCC rises above VPF, RST remains low for a period of time
(tRPU) to allow VCC to stabilize.
The block diagram in Figure 4 shows the main elements of the DS1672. As shown, communications to
and from the DS1672 occur serially over a I
2C, bidirectional bus. The DS1672 operates as a slave device
on the I
2C bus. Access is obtained by implementing a START condition and providing a device
identification code followed by a register address. Subsequent registers can be accessed sequentially until
a STOP condition is executed.
Figure 4. Block Diagram
Oscillator Circuit
The DS1672 uses an external 32.768kHz crystal. The oscillator circuit does not require any external
resistors or capacitors to operate. Table 1 specifies several crystal parameters for the external crystal.
Figure 4 shows a functional schematic of the oscillator circuit. If using a crystal with the specified
characteristics, the startup time is usually less than one second.
Table 1. Crystal Specifications*
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Nominal Frequency
FO
32.768
kHz
Series Resistance
ESR
45
k
Load Capacitance
CL
6
pF
* The crystal, traces, and crystal input pins should be isolated from RF generating signals. Refer to Application Note 58:
Clock Accuracy
The accuracy of the clock is dependent upon the accuracy 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
32-Bit Counter
(4 Bytes)
I2C Interface
Power Control
Address Register
Control Logic
1Hz
V
CC
V
BACKUP
GND
SCL
SDA
Control
Trickle Charger
X1
X2
RST
Dallas
Semiconductor
DS1672
C
L
C
L
N
Oscillator
and
divider
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1673 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Portable System Controller |
| DS1673-3 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Portable System Controller |
| DS1673-5 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Portable System Controller |
| DS1673E-3 | 功能描述:實(shí)時(shí)時(shí)鐘 Portable System Controller 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1673E-3/T&R | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:IC CTRLR SYSTEM PORT 3V 20-TSSOP |
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