- 您現(xiàn)在的位置：買賣IC網 > PDF目錄376969 > DS2437 Smart Battery Monitor PDF資料下載
參數(shù)資料
| 型號： | DS2437 |
| 英文描述： | Smart Battery Monitor |
| 中文描述： | 智能電池監(jiān)視器 |
| 文件頁數(shù)： | 9/31頁 |
| 文件大?。?/td> | 1215K |
| 代理商： | DS2437 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁當前第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁
DS2437
9 of 31
OPERATION – REAL TIME CLOCK
The 32.768 kHz crystal oscillator is used as the time base for the timekeeping functions. The timekeeping
functions are double-buffered, allowing the master to read time without the data changing while it is
being read. To accomplish this, a snapshot of the counter data is transferred to holding registers which the
user accesses. This occurs after the eighth bit of the Recall Memory command.
The real-time clock is a 4-byte binary counter with a 1-second resolution. The four bytes are a count of
seconds. The real-time clock can accumulate 136 years of seconds before rolling over. Time/date is
represented by the number of seconds since a reference point, which is determined by the user. For
example, 12:00 A.M., January 1, 1970 could be used as a reference point.
Two other time-related functions are available. The first is the DISCONNECT TIMESTAMP, which is
written to by the DS2437 whenever it senses that the DQ line has been low for more than 1 second. This
condition would signal that the battery pack has been removed from the system; the time when that
occurs is written into the DISCONNECT TIMESTAMP register, so that upon replacement into the
system, the system can determine how long the device has been in storage, to facilitate self-discharge
corrections to the remaining battery capacity. After the disconnect has been detected, the DS2437 reverts
to a sleep mode, during which nothing is active except the real time clock.
The other timestamp is the END OF CHARGE timestamp, which is written to by the DS2437 whenever it
senses that charging is finished (when current changes direction). This timestamp allows the user to
calculate the amount of time the battery has been in a discharge or storage state, again to facilitate self-
discharge calculations.
The format of the RTC, Disconnect, and End of Charge registers are as shown in Table 6. Refer to the
“Memory Map” section for the address location of the time-related registers.
Time Data Relationships
Table 6
Crystal Selection
A 32.768 kHz crystal, Daiwa Part No. DT26S, Seiko Part No. DS-VT-200 or equivalent can be directly
connected to the DS2437 via pins 11 and 13 (X1, X2). The crystal selected for use should have a
specified load capacitance (CL) of 6 pF. The crystal is connected directly to the X1 and X2 pins. There is
no need for external capacitors or resistors. Note: X1 and X2 are very high impedance nodes. It is
recommended that they and the crystal be guard ringed with ground and that high frequency signals be
kept away from the crystal area. For more information on crystal selection and crystal layout
considerations, please consult Application Note 58, “Crystal Considerations with Dallas Real Time
Clocks.”
相關PDF資料 |
PDF描述 |
|---|---|
| DS2438 | Smart Battery Monitor |
| DS2438Z | Smart Battery Monitor |
| DS2442 | Battery Management |
| DS2501 | 1A VERY LOW DROPOUT VOLTAGE REGULATORS |
| DS2502 | 1 kbit Add-Only Memory |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS2437K | 制造商:Maxim Integrated Products 功能描述:EVALUATION KIT BATTERY MONITO |
| DS2437S | 功能描述:IC MONITOR SMART BATTERY 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:1 系列:- 功能:充電管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:剪切帶 (CT) 產品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT |
| DS2437S/T&R | 制造商:Maxim Integrated Products 功能描述:SMART BATTERY MONITOR 16SSOP T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC MONITOR SMART BATTERY 16-SSOP |
| DS2437S/T&R/ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| DS2437S/T&R | 功能描述:IC MONITOR SMART BATTERY 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:1 系列:- 功能:充電管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:剪切帶 (CT) 產品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT |
發(fā)布緊急采購，3分鐘左右您將得到回復。