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參數(shù)資料
| 型號： | MAX6625 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | 9-Bit Temperature Sensors with IIC-Compatible Serial Interface in a SOT23(帶IIC兼容串口的9位溫度傳感器) |
| 中文描述： | 9位/12位溫度傳感器，帶有I²C兼容串行接口，SOT23封裝 |
| 文件頁數(shù)： | 11/13頁 |
| 文件大小： | 1455K |
| 代理商： | MAX6625 |
M
9-Bit/12-Bit Temperature Sensors with
I
2
C-Compatible Serial Interface in a SOT23
______________________________________________________________________________________
11
drain, and the MAX6625R/MAX6626R output includes
an internal 35k
(typ) pullup resistor. Figure 6 shows
the OT alarm operation and reset details.
Fault Queue
A programmable fault queue on the MAX6625/
MAX6626 eliminates spurious alarm activity in noisy
environments. The queue sets the number of consecu-
tive out-of-tolerance temperature readings that must
occur before the OT alarm output is toggled. An out-of-
tolerance reading is above T
HIGH
or below T
LOW
. The
fault queue depth defaults to one at power-up and may
be programmed to one, two, four, or six consecutive
conversions. Any time the conversion result is in toler-
ance, and OT is not asserted, the queue is cleared,
even if it contains some out-of-tolerance counts.
Additionally, the fault queue automatically clears at
power-up, in shutdown, or if a master writes to any of
the T
HIGH
, T
LOW
, or configuration registers. Whenever
the fault queue is cleared, OT is deasserted.
For example, the fault queue is set to four, two consec-
utive out-of-tolerance readings have occurred, and the
master writes to the T
LOW
register. The fault queue is
cleared and begins to look for four new consecutive
out-of-tolerance conversions.
Comparator Mode
In comparator mode, OT is asserted when the number
of consecutive conversions exceeding the value in the
T
HIGH
register is equal to the depth of the fault queue.
OT deasserts when the number of consecutive conver-
sions less than the value in the T
LOW
register is equal
to the depth of the fault queue. T
HIGH
minus T
LOW
is
the effective hysteresis of the OT output.
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, OT will
not assert until four consecutive conversions exceed
+100
°
C. Then, OT will not deassert until four consecu-
tive conversions are less than +80
°
C.
Comparator mode allows autonomous clearing of an OT
fault without the intervention of a master and is ideal to
use for driving a cooling fan (Figure 7).
Interrupt Mode
In interrupt mode, the MAX6625/MAX6626 look for a
T
HIGH
or a T
LOW
fault based on previous fault activity.
The OT pin asserts an alarm for an undertemperature
fault, as well as for an overtemperature fault, depending
on certain conditions. If the fault queue is cleared at
power-up, the IC looks for a T
HIGH
fault. After a T
HIGH
fault, the IC looks for a T
LOW
fault. After a T
LOW
fault,
the IC looks for a T
HIGH
fault, and it will bounce back
and forth if properly deasserted each time. Once either
fault has occurred, it remains active indefinitely until
deasserted by a read of any register, and the device
then begins to look for a fault of the opposite type. Also,
if the fault queue is cleared, OT is deasserted and the
IC once again looks for a T
HIGH
fault. The activation of
any fault is subject to the depth of the fault queue.
DIE
TEMPERATURE
TIME
*
*
*
T
HIGH
T
LOW
OT
(COMPARATOR MODE)
OT
(INTERRUPT MODE)
TEMPERATURE RESPONSE
SHOWN WITH OT SET FOR
ACTIVE LOW
*THIS ASSUMES DEASSERTION OF OT BY A
MASTER THROUGH THE SERIAL INTERFACE.
SEE
INTERRUPT MODE
SECTION.
Figure 6. OT Alarm Output and Reset Diagram
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| MAX6625PMUT-T | 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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
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