參數(shù)資料
型號： MAX6649MUA
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 模擬信號調(diào)理
英文描述： +145∑C Precision SMBus-Compatible Remote/ Local Sensors with Overtemperature Alarms
中文描述： SPECIALTY ANALOG CIRCUIT, PDSO8
封裝： 3 X 3 MM, MO-187CAA, MICRO, SOP-8
文件頁數(shù)： 8/16頁
文件大?。?/td> 227K
代理商： MAX6649MUA
M
+145°C Precision SMBus-Compatible Remote/
Local Sensors with Overtemperature Alarms
8
_______________________________________________________________________________________
Alarm Threshold Registers
Four registers store
ALERT
threshold values
—
one high-
temperature (T
HIGH
) and one low-temperature (T
LOW
)
register each for the local and remote channels. If either
measured temperature equals or exceeds the corre-
sponding
ALERT
threshold value, the
ALERT
interrupt
asserts.
The MAX6646/MAX6647 local (internal)
ALERT
T
HIGH
register POR state is 0101 0101, or +85
°
C, while the
remote (external)
ALERT
T
HIGH
register POR state is
0101 1111, or +95
°
C.The MAX6649 POR state of both
ALERT
T
HIGH
registers is 0101 0101, or +85
°
C. The POR
state of the local and remote T
LOW
registers for all
devices is 0000 0000, or 0
°
C.
Two additional registers store remote and local alarm
threshold data corresponding to the
OVERT
output. The
values stored in these registers are high-temperature
thresholds. If either of the measured temperatures equals
or exceeds the corresponding alarm threshold value, an
OVERT
output asserts. The MAX6646/MAX6647 local
(internal)
OVERT
register POR state is 0101 0101, or
+85
°
C, while the remote (external)
OVERT
register POR
state is 0111 1101, or +125
°
C. The MAX6649 POR state
of both
OVERT
registers is 0101 0101, or +85
°
C.
Diode Fault Alarm
A continuity fault detector at DXP detects an open cir-
cuit between DXP and DXN, or a DXP short to V
CC
,
GND, or DXN. If an open or short circuit exists, the
external temperature register is loaded with 1111 1111.
If the fault is an open-circuit fault bit 2 (OPEN), the sta-
tus byte is set to 1. In the MAX6649,
ALERT
is activated
at the end of the conversion. Immediately after POR,
the status register indicates that no fault is present. If a
fault is present upon power-up, the fault is not indicated
until the end of the first conversion.
ALERT
Interrupts
The
ALERT
interrupt occurs when the internal or external
temperature reading exceeds a high- or low-temperature
limit (programmed) or in the MAX6649, when the remote
diode is disconnected (for continuity fault detection). The
ALERT
interrupt output signal is latched and can be
cleared only by either reading the status register or by
successfully responding to an alert response address. In
both cases, the alert is cleared if the fault condition no
longer exists. Asserting
ALERT
does not halt automatic
conversion. The
ALERT
output is open drain, allowing
multiple devices to share a common interrupt line.
The MAX6646/MAX6647/MAX6649 respond to the
SMBus alert response address, an interrupt pointer
return-address feature (see the
Alert Response
Address
section). Prior to taking corrective action,
always check to ensure that an interrupt is valid by
reading the current temperature.
Fault Queue Register
In some systems, it may be desirable to ignore a single
temperature measurement that falls outside the
ALERT
limits. Bits 1 and 2 of the fault queue register (address
22h) determine the number of consecutive temperature
faults necessary to set
ALERT
(see Tables 3 and 4).
Alert Response Address
The SMBus alert response interrupt pointer provides
quick fault identification for simple slave devices that
lack the complex, expensive logic needed to be a bus
master. Upon receiving an
ALERT
interrupt signal, the
host master can broadcast a receive byte transmission
to the alert response slave address (0001 100).
Following such a broadcast, any slave device that gen-
erated an interrupt attempts to identify itself by putting
its own address on the bus.
SMBCLK
A
B
C
D
E
F
G
H
I
J
K
SMBDATA
t
SU:STA
t
HD:STA
t
LOW
t
HIGH
t
SU:DAT
t
HD:DAT
t
SU:STO
t
BUF
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
E = SLAVE PULLS SMBDATA LINE LOW
L
M
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO MASTER
H = LSB OF DATA CLOCKED INTO MASTER
I = MASTER PULLS DATA LINE LOW
J = ACKNOWLEDGE CLOCKED INTO SLAVE
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION
M = NEW START CONDITION
Figure 3. SMBus Read Timing Diagram
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX6649MUA/V+ 功能描述:板上安裝溫度傳感器 145C SMBus-Comp Remote/Local Sensor RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
MAX6649MUA/V+T 功能描述:板上安裝溫度傳感器 145C SMBus-Comp Remote/Local Sensor RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
MAX6649MUA+ 功能描述:板上安裝溫度傳感器 145C SMBus-Comp Remote/Local Sensor RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
MAX6649MUA+T 功能描述:板上安裝溫度傳感器 145C SMBus-Comp Remote/Local Sensor RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
MAX6649MUA-G002 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
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