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參數(shù)資料
| 型號： | MAX6673 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | PWM Output Temperature Sensors in SC70 Packages |
| 中文描述： | PWM輸出的溫度傳感器，SC70封裝 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 125K |
| 代理商： | MAX6673 |
Detailed Description
The MAX6672/MAX6673 are low-current (60μA, typ),
local temperature sensors ideal for interfacing with μCs
or μPs. The MAX6672/MAX6673 convert their own tem-
perature into a ratiometric PWM output. The square-
wave output waveform time ratio contains the
temperature information. The output is a square wave
with a nominal frequency of 1.4kHz at +25
°
C. The tem-
perature is obtained with the following formula:
Temperature (
°
C) = -200 x(0.85 - t
1
/ t
2
)
3
+ (425 xt
1
/ t
2
) - 273
Where t
1
is a fixed value and t
2
is modulated with the
temperature. Table 1 lists time ratio vs. temperature.
For temperatures greater than +50
°
C, the temperature
error is primarily first order and the following equation
can be used:
Temperature (
°
C) = (425 xt
1
/ t
2
) - 273
The MAX6673 has a push-pull output. The rise and fall
times of the MAX6673 output are negligible with
respect to the period; therefore, errors caused by
capacitive loading are minimized.
The output load capacitance should be minimized in
MAX6672 applications because the sourcing current is
set by the pullup resistor. If the output capacitance
becomes too large, unequal rise and fall times distort
the pulse width, thus delivering inaccurate readings.
Applications Information
Pulse-Width Modulation
Interfacing with a μC
The
Typical Application Circuit
shows the MAX6672/
MAX6673 interfaced with a μC. In this example, the
MAX6672/MAX6673 convert the ambient temperature
to a PWM waveform. The μC reads the temperature by
measuring the t
1
and t
2
periods in software and hard-
ware. The only timing requirements are that the clock
frequency used for timing measurements is stable and
0
8
4
12
16
20
THERMAL RESPONSE
IN STIRRED OIL BATH
M
TIME (s)
T
°
C
25
50
75
100
TRANSITION FROM +25
°
C AIR
TO +100
°
C STIRRED OIL BATH
0
10
5
20
15
25
30
-50
0
-25
25
50
75
100
125
OUTPUT SINK CURRENT
vs. TEMPERATURE
M
TEMPERATURE (
°
C)
S
V
OL
= 0.4V
V
CC
= 3.3V
V
CC
= 5V
0
1.0
0.5
2.0
1.5
2.5
3.0
-50
0
-25
25
50
75
100
125
MAX6673 OUTPUT SOURCE CURRENT
vs. TEMPERATURE
M
TEMPERATURE (
°
C)
S
V
OH
= V
CC
- 0.5V
V
CC
= 3.3V
V
CC
= 5V
M
PWM Output Temperature Sensors
in SC70 Packages
4
_______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
CC
= 3.3V, T
A
= +25
°
C, unless otherwise noted.)
PIN
1
2
3, 4
5
NAME
DOUT
N.C.
GND
V
CC
FUNCTION
Digital Output Pin. PWM output, open-drain output (MAX6672), or push-pull output (MAX6673).
No Connection. Not internally connected.
Pin 3 and Pin 4 must be tied together and connected to ground.
Positive Supply. Bypass with a 0.1μF capacitor to GND.
Pin Description
相關PDF資料 |
PDF描述 |
|---|---|
| MAX6673AXK-T | PWM Output Temperature Sensors in SC70 Packages |
| MAX6677 | Low-Voltage, 1.8kHz PWM Output Temperature Sensors |
| MAX6676AUT3 | Low-Voltage, 1.8kHz PWM Output Temperature Sensors |
| MAX6676AUT3-T | HEX SCHMITT-TRIGGER INVERTERS 14-CDIP -55 to 125 |
| MAX6676AUT5 | HEX SCHMITT-TRIGGER INVERTERS 14-CFP -55 to 125 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6673AXK | 制造商:Maxim Integrated Products 功能描述:PWM OUTPUT TEMPERATURE SENSORS IN S - Cut Tape Product |
| MAX6673AXK+ | 制造商:Maxim Integrated Products 功能描述:TEMP SENSOR DGTL 1-WIRE 5PIN SC-70 - Cut Tape Product |
| MAX6673AXK+T | 功能描述:板上安裝溫度傳感器 PWM Output 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(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 |
| MAX6673AXK-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 |
| MAX6673AXT-T | 制造商:Maxim Integrated Products 功能描述:PWM OUTPUT TEMPERATURE SENSORS IN SC70 PACKAG - Tape and Reel |
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