參數(shù)資料
型號(hào)： MAX6885ETP
廠(chǎng)商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 電源管理
英文描述： EEPROM-Programmable, Hex, Power-Supply Supervisors with an ADC
中文描述： 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC20
封裝： 5 X 5 MM, 0.80 MM PITCH, MO-220WHHC, QFN-20
文件頁(yè)數(shù)： 20/34頁(yè)
文件大?。?/td> 310K
代理商： MAX6885ETP
MAX6884/MAX6885
EEPROM-Programmable, Hex
Power-Supply Supervisory Circuits
______________________________________________________________________________________
27
SCL
1
S
2
89
SDA BY
TRANSMITTER
SDA BY
RECEIVER
START
CONDITION
CLOCK PULSE FOR ACKNOWLEDGE
Figure 9. Acknowledge
Start and Stop Conditions
Both SCL and SDA idle high when the bus is not busy. A
master device signals the beginning of a transmission
with a START (S) condition (see Figure 8) by transitioning
SDA from high to low while SCL is high. The master
device issues a STOP (P) condition (see Figure 8) by
transitioning SDA from low to high while SCL is high. A
STOP condition frees the bus for another transmission.
The bus remains active if a REPEATED START condition
is generated, such as in the block read protocol (see
Figure 11).
Early STOP Conditions
The MAX6884/MAX6885 recognize a STOP condition at
any point during transmission except if a STOP condition
occurs in the same high pulse as a START condition.
This condition is not a legal I2C format; at least one clock
pulse must separate any START and STOP condition.
Repeated START Conditions
A REPEATED START (SR) condition may indicate a
change of data direction on the bus. Such a change
occurs when a command word is required to initiate a
read operation (see Figure 11). SR may also be used
when the bus master is writing to several I2C devices
and does not want to relinquish control of the bus. The
MAX6884/MAX6885 serial interface supports continu-
ous write operations with or without an SR condition
separating them. Continuous read operations require
SR conditions because of the change in direction of
data flow.
Acknowledge
The acknowledge bit (ACK) is the 9th bit attached to any
8-bit data word. The receiving device always generates
an ACK. The MAX6884/MAX6885 generate an ACK
when receiving an address or data by pulling SDA low
during the 9th clock period (see Figure 9). When trans-
mitting data, such as when the master device reads data
back from the MAX6884/MAX6885, the MAX6884/
MAX6885 wait for the master device to generate an ACK.
Monitoring ACK allows for detection of unsuccessful
data transfers. An unsuccessful data transfer occurs if
the receiving device is busy or if a system fault has
occurred. In the event of an unsuccessful data transfer,
the bus master should reattempt communication at a
later time. The MAX6884/MAX6885 generate a NACK
after the command byte during a software reboot, while
writing to the EEPROM, or when receiving an illegal
memory address.
Slave Address
The MAX6884/MAX6885 slave address conforms to the
following table:
SA7
(MSB)
SA6
SA5
SA4
SA3
SA2
SA1
SA0
(LSB)
10
0
A0
X
R/W
X = Don’t care.
相關(guān)PDF資料
PDF描述
MAX6887AETE Hex/Quad, Power-Supply Supervisory Circuits
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX6885ETP+ 功能描述:監(jiān)控電路 EEPROM-Prog Hex Power-Sup Sequencer 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
MAX6885ETP+T 功能描述:監(jiān)控電路 EEPROM-Prog Hex Power-Sup Sequencer 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
MAX6885ETP-T 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
MAX6886ETP 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
MAX6886ETP+ 功能描述:監(jiān)控電路 Pin-Selectable Hex Power-Sup 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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