- 您现在的位置：买卖IC网 > PDF目录178070 > LM99 (National Semiconductor Corporation) 【1C Accurate, High Temperature, Remote Diode Temperature Sensor with Two-Wire Interface PDF资料下载
参数资料
| 型号： | LM99 |
| 厂商： | National Semiconductor Corporation |
| 元件分类： | 温度/湿度传感器 |
| 英文描述： | 【1C Accurate, High Temperature, Remote Diode Temperature Sensor with Two-Wire Interface |
| 中文描述： | 【集成电路准确，高温，远程二极管温度传感器，两线接口 |
| 文件页数： | 2/20页 |
| 文件大小： | 349K |
| 代理商： | LM99 |
1.0 Functional Description (Continued)
Remote temperature data is represented by an 11-bit, two’s
complement word with an LSB (Least Significant Bit) equal
to 0.125C. The data format is a left justified 16-bit word
available in two 8-bit registers:
Actual vs. LM99 Remote Temperature Conversion
Actual Remote Diode
Temperature,C
LM99 Remote Diode
Temperature Register, C
Binary Results in LM99
Remote Temperature Register
Hex Remote
Temperature
Register
120
+104
0110 1000 0000 0000
6800h
125
+109
0110 1101 0000 0000
6D00h
126
+110
0110 1110 0000 0000
7100h
130
+114
0111 0010 0010 0000
7200h
135
+119
0111 0111 0000 0000
7700h
140
+124
0111 1100 0000 0000
7200h
Output is 11-bit two’s complement word. LSB = 0.125 C.
Actual vs. Remote T_Crit Setpoint
Actual Remote Diode
T_Crit Setpoint,C
Factory-Programmed
Remote T_CRIT High
Setpoint, C
Binary Remote T_CRIT High
Setpoint Value
Hex Remote T_CRIT
High Setpoint Value
126
+110
0110 1110
71h
Local Temperature data is represented by an 8-bit, two’s
complement byte with an LSB (Least Significant Bit)
equal to 1C:
Local
Temperature
Digital Output
Binary
Hex
+125C
0111 1101
7Dh
+25C
0001 1001
19h
+1C
0000 0001
01h
0C
0000 0000
00h
1C
1111 1111
FFh
25C
1110 0111
E7h
55C
1100 1001
C9h
1.7 OPEN-DRAIN OUTPUTS
The SMBData, ALERT and T_CRIT_A outputs are open-
drain outputs and do not have internal pull-ups. A “high” level
will not be observed on these pins until pull-up current is
provided by some external source, typically a pull-up resis-
tor. Choice of resistor value depends on many system fac-
tors but, in general, the pull-up resistor should be as large as
possible. This will minimize any internal temperature reading
errors due to internal heating of the LM99. The maximum
resistance of the pull-up to provide a 2.1V high level, based
on LM99 specification for High Level Output Current with the
supply voltage at 3.0V, is 82 k
(5%) or 88.7 k (1%).
1.8 DIODE FAULT DETECTION
The LM99 is equipped with operational circuitry designed to
detect fault conditions concerning the remote diode. In the
event that the D+ pin is detected as shorted to V
DD or
floating, the Remote Temperature High Byte (RTHB) register
is loaded with +127C, the Remote Temperature Low Byte
(RTLB) register is loaded with 0, and the OPEN bit (D2) in
the status register is set. As a result, if the Remote T_CRIT
setpoint register (RCS) is set to a value less than +127C the
ALERT and T_Crit output pins will be pulled low, if the Alert
Mask and T_Crit Mask are disabled. If the Remote HIGH
Setpoint High Byte Register (RHSHB) is set to a value less
than +127C then ALERT will be pulled low, if the Alert Mask
is disabled. The OPEN bit itself will not trigger and ALERT.
In the event that the D+ pin is shorted to ground or D, the
Remote Temperature High Byte (RTHB) register is loaded
with 128C (1000 0000) and the OPEN bit (D2) in the status
register will not be set. Since operating the LM99 at 128C
is beyond it’s operational limits, this temperature reading
represents this shorted fault condition. If the value in the
Remote Low Setpoint High Byte Register (RLSHB) is more
than 128C and the Alert Mask is disabled, ALERT will be
pulled low.
Remote diode temperature sensors that have been previ-
ously released and are competitive with the LM99 output a
code of 0C if the external diode is short-circuited. This
change is an improvement that allows a reading of 0C to be
truly interpreted as a genuine 0C reading and not a fault
condition.
LM99
www.national.com
10
相关PDF资料 |
PDF描述 |
|---|---|
| LMF/1/40209/522 | 12 CONTACT(S), BRASS, FEMALE, CIRCULAR CONNECTOR, SOCKET |
| LMF/1/40209/523 | 12 CONTACT(S), BRASS, FEMALE, CIRCULAR CONNECTOR, SOCKET |
| LMF/1/40209/524 | 12 CONTACT(S), BRASS, FEMALE, CIRCULAR CONNECTOR, SOCKET |
| LMF/1/40209/525 | 12 CONTACT(S), BRASS, FEMALE, CIRCULAR CONNECTOR, SOCKET |
| LMF/1/40210/520 | 4 CONTACT(S), BRASS, FEMALE, CIRCULAR CONNECTOR, SOCKET |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM99-1CIMM | 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 |
| LM99-1CIMM/NOPB | 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 |
| LM99-1CIMMX | 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 |
| LM99-1CIMMX/NOPB | 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 |
| LM99-1EVAL | 功能描述:BOARD EVALUATION LM99-1 RoHS:否 类别:编程器，开发系统 >> 评估板 - 传感器 系列:PowerWise® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- |
发布紧急采购，3分钟左右您将得到回复。