參數(shù)資料
型號(hào)： MAX6917EO50
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述： REAL TIME CLOCK, PDSO20
封裝： 0.150 INCH, 0.025 INCH PITCH, MO-137AD, QSOP-20
文件頁(yè)數(shù)： 20/31頁(yè)
文件大?。?/td> 349K
代理商： MAX6917EO50
MAX6917
I2C-Compatible RTC with Microprocessor
Supervisor, Alarm, and NV RAM Controller
______________________________________________________________________________________
27
only tests the battery for 1s every 24hr. If a good bat-
tery (one that has not been previously flagged with
BATT_LO) is removed between battery tests, the
MAX6917 does not immediately sense the removal and
does not activate BATT_LO until the next-scheduled
battery test. For this reason, a software-commanded
battery test should be performed after a battery
replacement by writing any data to the battery-test reg-
ister at address 1Ah.
Battery monitoring is only a useful technique when test-
ing can be done regularly over the entire life of a lithium
battery. Because the MAX6917 only performs battery
monitoring when VCC is nominal, systems that are pow-
ered down for excessively long periods can completely
drain their lithium cells without receiving any advanced
warning. To prevent such an occurrence, systems
using the MAX6917 battery-monitoring feature should
be powered up periodically (at least every few months)
to perform battery testing. Furthermore, anytime
BATT_LO is activated on the first battery test after a
power-up, data integrity should be checked through a
checksum or other technique. Timekeeping data would
also be suspect and should be checked for accuracy
against an accurate known reference.
tBTCN
tBTPW
tBL
ONCE THE BATTERY IS DETECTED AS LOW,
THE PERIODIC BATTERY TESTING CEASES.
A BATTERY CHECK CAN BE INITIATED BY
WRITING TO THE REGISTER 0x1A.
VRST
VCC
VBATT
BATTERY-
TEST ACTIVE
BATT_LO
VBTP (BATTERY TEST POINT)
Figure 18. Battery-Test Timing Diagram
VCC
VBATT
0V
VOUT
0V
VRST
VBATT
VRST
EXIT FRESHNESS
SEAL MODE
FRESHNESS
SEAL RESET
VBATT CONNECTED TO VOUT
VCC CONNECTED
TO VOUT
VBATT CONNECTED
TO VOUT
VCC CONNECTED
TO VOUT
VBATT CONNECTED
TO VOUT
VBATT
FLOATING
VBATT
FLOATING
BATTERY
ATTACH
BATTERY
DETACH
BATTERY
ATTACH
BATTERY
DETACH
Figure 19. Battery Switchover Diagram
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX6917EO50+ 功能描述:實(shí)時(shí)時(shí)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(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
MAX6917EO50+T 功能描述:實(shí)時(shí)時(shí)鐘 Integrated Circuits (ICs) 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
MAX691AC/D 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
MAX691ACPE 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
MAX691ACPE+ 功能描述:監(jiān)控電路 MPU Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
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