參數資料
型號： MAX6634
廠商： Maxim Integrated Products, Inc.
元件分類： 溫度/濕度傳感器
英文描述： 12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface(1SMBus/IIC兼容串行接口的帶符號位12位溫度傳感器)
中文描述： 12位 + 符號位溫度傳感器，帶有SMBus/I²C兼容串行接口
文件頁數： 11/16頁
文件大?。?/td> 210K
代理商： MAX6634
Temperature Alert
(MAX6634/MAX6635)
ALERT
has programmable polarity and two modes:
comparator and interrupt. Polarity and mode are select-
ed through the Configuration register (Table 4). The
ALERT
output is open drain.
Interrupt Mode
With
ALERT
in interrupt mode, the MAX6634/MAX6635
look for a T
HIGH
or a T
LOW
fault. The
ALERT
pin asserts
an alarm for an undertemperature fault, as well as for
an overtemperature fault. Once either fault has
occurred, it remains active until deasserted by a read
of any register. The device then begins to look for a
temperature change crossing the hysteresis level. The
activation of
ALERT
is subject to the depth of the fault
queue.
For example: If T
HIGH
is set to 100
°
C, T
HYST
is set to
20
°
C, and the fault queue depth is set to 4,
ALERT
does not assert until four consecutive conversions
exceed 100
°
C. If the temperature is then read through
the I
2
C-compatible interface,
ALERT
deasserts.
ALERT
asserts again when four consecutive conversions are
less than 80
°
C.
Comparator Mode
In comparator mode,
ALERT
is asserted when the num-
ber of consecutive conversions exceeding the value in
the T
HIGH
register, or lower than the value in the T
LOW
register, is equal to the depth of the fault queue.
ALERT
deasserts when the number of consecutive conversions
less than T
HIGH
- T
HYST
or greater than T
LOW
+ T
HYST
is equal to the depth of the fault queue.
For example: If T
HIGH
is set to 100
°
C, T
LOW
is set to
80
°
C, and the fault queue depth is set to four,
ALERT
does not assert until four consecutive conversions
exceed 100
°
C, or are below 80
°
C.
ALERT
only
deasserts if four consecutive conversions are less than
T
HIGH
- T
HYST
or greater than T
LOW
+ T
HYST
.
Comparator mode allows autonomous clearing of an
ALERT
fault without the intervention of a master and is
ideal to use for driving a thermostat (Figure 10).
Overtemperature Alarm (MAX6635)
The MAX6635 also includes an overtemperature output
that is always in comparator mode. Whenever the tem-
perature exceeds a value in the programmable T
MAX
register,
OVERT
is asserted.
OVERT
only deasserts
after the temperature drops below T
MAX
- T
HYST
. When
the fault queue is activated,
OVERT
is subject to that
queue, which sets the number of faults that must occur
before
OVERT
asserts or deasserts. This helps prevent
spurious alarms in noisy environments.
Comparator mode also allows autonomous clearing of
an
OVERT
fault without the intervention of a master and
thus is ideal to use for driving a cooling fan (Figure 11).
In this application, the polarity of
OVERT
is active high.
Shutdown
The MAX6633/MAX6634/MAX6635 feature a shutdown
mode, accessible through the serial interface that
saves power by turning off everything except the POR
M
12-Bit Plus Sign Temperature Sensors with
SMBus/I
2
C-Compatible Serial Interface
______________________________________________________________________________________
11
3
8
VCC
+3V TO +5.5V
MAX6634
RELAY
5VDC, 20mA
125VAC, 1A
2N3904
HEATER
SUPPLY
HEATER
4
4k
ALERT
Figure 10. Simple Thermostat
3
10k
8
V
CC
+3V TO +5.5V
+12V
MAX6635
4
12V 300mA
MOTOR
FAN
LOGIC-LEVEL
MOSFET
OVERT
Figure 11. Fan Controller
相關PDF資料
PDF描述
MAX6635 12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface(1SMBus/IIC兼容串行接口的帶符號位12位溫度傳感器)
MAX6633 12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface(1SMBus/IIC兼容串行接口的帶符號位12位溫度傳感器)
MAX6633MSA 12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface
MAX6634MSA 4-Bit Binary Counter 14-CDIP -55 to 125
MAX6635MSA 4-Bit Binary Counter 14-CDIP -55 to 125
相關代理商/技術參數
參數描述
MAX6634MSA 功能描述:板上安裝溫度傳感器 12-Bit + Sign Temperature 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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor
MAX6634MSA+ 功能描述:板上安裝溫度傳感器 12-Bit + Sign Temperature 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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor
MAX6634MSA+T 功能描述:板上安裝溫度傳感器 12-Bit + Sign Temperature 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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor
MAX6634MSA-T 功能描述:板上安裝溫度傳感器 12-Bit + Sign Temperature 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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor
MAX6635EVKIT+ 功能描述:板上安裝溫度傳感器 MAX6635 Eval Kit 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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor
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