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| 型号： | SA56004ADP |
| 厂商： | NXP Semiconductors N.V. |
| 元件分类： | 温度/湿度传感器 |
| 英文描述： | +--1 deg Cel accurate, SMBus-compatible, 8-pin, remote-local digital temperature sensor with overtemperature alarms |
| 封装： | SA56004AD<SOT96-1 (SO8)|<<http://www.nxp.com/packages/SOT96-1.html<1<week 11, 2005,;SA56004AD<SOT96-1 (SO8)|<<http://www.nxp.com/packages/SOT96-1.html<1<week 11, 20 |
| 文件页数： | 17/36页 |
| 文件大小： | 197K |
| 代理商： | SA56004ADP |
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SA56004X_5
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 05 — 22 May 2008
17 of 36
NXP Semiconductors
SA56004X
Digital temperature sensor with overtemperature alarms
Event F
: Three consecutive measurements have been made with the remote
temperature below the RCS
TH threshold; the T_CRIT output is de-activated (goes
HIGH).
Event G
: The remote temp falls below the Remote LOW setpoint.
Event H
: Three consecutive measurements are made with the temp below the Remote
LOW setpoint; ALERT output is activated (goes LOW).
Event I
: The ALERT output is de-activated (goes HIGH) after a above_low_limit
temperature measurement is completed.
7.9.4
Remote diode selection
To measure the remote temperature or the temperature of an externally attached diode,
the device automatically forces two successive currents of about 160
μ
A and 10
μ
A at D+
pin. It measures the voltage (V
BE
) between D+ and D
, detects the difference between the
two V
BE
voltages or the
V
BE
and then converts the
V
BE
into a temperature data using
the basic PTAT voltage formula as shown in
Equation 1
. The device typically takes about
38 ms to perform a measurement during each conversion period or cycle, which is
selectable by programming the conversion rate register.
(1)
Where:
n = diode ideality factor
k = Boltzmann’s constant
T = absolute temperature (
°
K) = 273
°
C + T (
°
C)
q = electron charge
ln = natural logarithm
l2, l1 = two source currents
Because the device does not directly convert the sensed V
BE
as in the old method of
temperature measurement systems, the V
BE
calibration is not required. Furthermore, the
device remote temperature error is adjusted at the manufacturer to meet the specifications
with the use of the reference diode-connected transistors such as the 2N3904/2N3906.
The diode type to be used in customer applications must have the characteristics as close
to the 2N3904/2N3906 as possible in order to obtain optimal results. Finally, to prevent the
effects of system noise on the measured V
BE
signals, an external capacitor of about
2200 pF connected between the D+ and D
pins as well as the grounded-shield cable for
the diode connection wires are recommended.
7.9.5
Diode fault detection
The SA56004X is designed with circuitry to detect the fault conditions of the remote diode.
When the D+ pin is shorted to V
DD
or floating, the Remote Temperature High Byte (RTHB)
register is loaded with +127
°
C, the Remote Temperature Low Byte (RTLB) register is
loaded with 0
°
C, and the OPEN bit (bit 2 of the Status register) is set. Under the above
conditions of D+ shorted to V
DD
or floating, if the Remote T_CRIT setpoint is set less than
+127
°
C, and T_CRIT Mask are disabled, then, the T_CRIT output pins will be pulled
V
BE
n
q
------
×
l1
----
ln
×
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SA56004ADP,118 | 功能描述:板上安装温度传感器 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 |
| SA56004AD-T | 功能描述:板上安装温度传感器 I2C LOC +/- 2OC AND REM +/- 1OC TS 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 |
| SA56004ATK | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:±1 °C accurate, SMBus-compatible, 8-pin, remote/local digital temperature sensor with overtemperature alarms |
| SA56004ATK,118 | 功能描述:板上安装温度传感器 SMBUS-COMPATIBLE REM LOCL DIGI TEMP SENS 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 |
| SA56004ATK118 | 制造商:Rochester Electronics LLC 功能描述: 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述: |
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