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参数资料
| 型号： | MAX6699EE99+ |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 温度/湿度传感器 |
| 英文描述： | 5-Channel Precision Temperature Monitor |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 1Cel, RECTANGULAR, SURFACE MOUNT |
| 封装： | 0.150 INCH, 0.025 INCH PITCH, LEAD FREE, MO-137AB, QSOP-16 |
| 文件页数： | 5/22页 |
| 文件大小： | 347K |
| 代理商： | MAX6699EE99+ |
sensor designed for a nominal ideality factor nNOMINAL
is used to measure the temperature of a diode with a
different ideality factor n1. The measured temperature
TM can be corrected using:
where temperature is measured in Kelvin and
nNOMIMAL for the MAX6699 is 1.008. As an example,
assume you want to use the MAX6699 with a CPU that
has an ideality factor of 1.002. If the diode has no
series resistance, the measured data is related to the
real temperature as follows:
For a real temperature of +85°C (358.15K), the mea-
sured temperature is +82.87°C (356.02K), an error of
-2.13°C.
Series Resistance Cancellation
Some thermal diodes on high-power ICs can have
excessive series resistance, which can cause tempera-
ture-measurement errors with conventional remote tem-
perature sensors. Channel 1 of the MAX6699 has a
series resistance cancellation feature (enabled by bit 3
of the Configuration 1 register) that eliminates the effect
of diode series resistance. Set bit 3 to 1 if the series
resistance is large enough to affect the accuracy of
channel 1. The series resistance cancellation function
increases the conversion time for channel 1 by 125ms.
This feature cancels the bulk resistance of the sensor
and any other resistance in series (wire, contact resis-
tance, etc.). The cancellation range is from 0 to 100.
Discrete Remote Diodes
When the remote-sensing diode is a discrete transistor,
its collector and base must be connected together.
Table 10 lists examples of discrete transistors that are
appropriate for use with the MAX6699. The transistor
must be a small-signal type with a relatively high forward
voltage; otherwise, the A/D input voltage range can be
violated. The forward voltage at the highest expected
temperature must be greater than 0.25V at 10A, and at
the lowest expected temperature, the forward voltage
must be less than 0.95V at 100A. Large power transis-
tors must not be used. Also, ensure that the base resis-
tance is less than 100. Tight specifications for forward
current gain (50 < <150, for example) indicate that the
manufacturer has good process controls and that the
devices have consistent VBE characteristics.
Manufacturers of discrete transistors do not normally
specify or guarantee ideality factor. This is normally not
a problem since good-quality discrete transistors tend to
have ideality factors that fall within a relatively narrow
range. A variety of discrete transistors have variations in
remote temperature readings of less than ±2°C. Still, it is
good design practice to verify good consistency of tem-
perature readings with several discrete transistors from
any manufacturer under consideration.
TT
n
TT
ACTUAL
M
NOMINAL
MM
=×
=×
=
1
1 008
1 002
1 00599
.
(.
)
TT
n
M
ACTUAL
NOMINAL
=
1
MAX6699
5-Channel Precision Temperature Monitor
______________________________________________________________________________________
13
Table 6. Configuration 3 Register
BIT
NAME
POR
STATE
FUNCTION
7(MSB)
Reserved
0
—
6
Reserved
0
—
5
Reserved
—
4
Reserved
—
3
Mask OVERT 4
0
Channel 4 Remote-Diode
OVERT Mask Bit. Set to logic 1 to mask channel 4
OVERT.
2
Reserved
0
—
1
Reserved
0
—
0
Mask OVERT 1
0
Channel 1 Remote-Diode
OVERT Mask Bit. Set to logic 1 to mask channel 1
OVERT.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6699EE99+ | 功能描述:板上安装温度传感器 5Ch Precision Temperature Monitor RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| MAX6699EE99+T | 功能描述:板上安装温度传感器 5Ch Precision Temperature Monitor RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| MAX6699EE99-T | 制造商:Maxim Integrated Products 功能描述:5-CHANNEL PRECISION TEMPERATURE MONITOR - Tape and Reel |
| MAX6699EE9C | 功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| MAX6699EE9C+ | 功能描述:板上安装温度传感器 5Ch Precision Temperature Monitor RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
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