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| 型号： | TMP431BDGKT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封装： | GREEN, PLASTIC, MSOP-8 |
| 文件页数： | 40/40页 |
| 文件大小： | 790K |
| 代理商： | TMP431BDGKT |
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SBOS441C
– SEPTEMBER 2009 – REVISED FEBRUARY 2011
APPLICATION INFORMATION
controlling the emitter current provided acceptable
The
TMP431
(two-channel)
and
TMP432
temperature measurement results. At 90nm process
(three-channel) are digital temperature sensors that
geometry and below, however, the beta factor
combine
a
local
die
temperature
measurement
continues to decrease and the premise that it is
channel
and
a
remote
junction
temperature
independent
of
collector
current
becomes
less
measurement channel in a single MSOP-8 (TMP431)
certain.
or MSOP-10 (TMP432) package. They are Two-Wire-
and SMBus interface-compatible and are specified
To manage this increasing temperature measurement
over a temperature range of
–40°C to +125°C. The
error, the TMP431/32 control the collector current
TMP431/32 contain multiple registers for holding
instead of the emitter current. The TMP431/32
configuration information, temperature measurement
automatically detect and choose the correct range
results, temperature comparator maximum/minimum
depending
on
the
beta
factor
of
the
external
limits, and status information. User-programmed high
transistor. This auto-ranging is performed at the
and low temperature limits stored in the TMP431/32
beginning of each temperature conversion in order to
can be used to trigger an over/under temperature
correct for any changes in the beta factor as a result
alarm (ALERT) on local and remote temperatures.
of temperature variation. The device can operate a
Additional thermal limits can be programmed into the
PNP transistor with a beta factor as low as 0.1. See
TMP431/32 and used to trigger another flag (THERM)
the
that can be used to initiate a system response to
section for further information.
rising temperatures.
Series Resistance Cancellation
For proper remote temperature sensing operation, the
TMP431
requires
only
a
transistor
connected
Series resistance in an application circuit that typically
between DXP and DXN; the TMP432 requires
results
from
printed
circuit
board
(PCB)
trace
transistors conncected between DXP1 and DXN1,
resistance and remote line length is automatically
and between DXP2 and DXN2.
cancelled by the TMP431/32, preventing what would
otherwise result in a temperature offset. A total of up
The SCL and SDA interface pins require pull-up
to 1k
of series line resistance is cancelled by the
resistors as part of the communication bus, while
TMP431/32 if beta correction is disabled and up to
ALERT and THERM are open-drain outputs that also
300
of series line resistance is cancelled if beta
need pull-up resistors. ALERT and THERM may be
correction is enabled, eliminating the need for
shared with other devices if desired for a wired-OR
additional characterization and temperature offset
implementation.
A
0.1
μF
power-supply
bypass
correction. See the two Remote Temperature Error vs
capacitor is recommended for good local bypassing.
Series
Resistance
typical
characteristic
curves
See Figure 13 for a typical configuration of the
TMP431; see Figure 14 for a typical configuration of
series resistance on sensed remote temperature
the TMP432.
error.
Beta Compensation
Differential Input Capacitance
Previous generations of remote junction temperature
The
TMP431/32
can
tolerate
differential
input
sensors were operated by controlling the emitter
capacitance of up to 2200pF with minimal change in
current
of
the
sensing
transistor.
However,
temperature error. The effect of capacitance on
examination of the physics of a transistor shows that
sensed remote temperature error is illustrated in
VBE is actually a function of the collector current. If
Figure 9 and Figure 10, Remote Temperature Error
beta is independent of the collector current, then VBE
vs Differential Capacitance. See the Filtering section
may be calculated from the emitter current. In earlier
for suggested component values where filtering
generations
of
processors
that
contained
PNP
unwanted coupled signals is needed.
transistors connected to these temperature sensors,
2009–2011, Texas Instruments Incorporated
9
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相关代理商/技术参数 |
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| TMP431CDGKR | 功能描述:板上安装温度传感器 +/-1C Remote and Local Temp Sensor 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 |
| TMP431CDGKT | 功能描述:板上安装温度传感器 +/-1C Remote and Local Temp Sensor 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 |
| TMP431DDGKR | 功能描述:板上安装温度传感器 +/-1C Remote and Local Temp Sensor 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 |
| TMP431DDGKT | 功能描述:板上安装温度传感器 +/-1C Remote and Local Temp Sensor 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 |
| TMP432ADGSR | 功能描述:板上安装温度传感器 Remote & Local Temp Sensor 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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