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參數(shù)資料
| 型號： | KSZ8051MLLI TR |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 47/51頁 |
| 文件大小： | 0K |
| 描述： | TXRX PHY 10/T100 3.3V MII 48LQFP |
| 特色產(chǎn)品： | KSZ8051/8031/8021 Series |
| 標準包裝： | 1 |
| 類型： | PHY 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | MII |
| 電源電壓： | 1.8V，2.5V，3.3V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-LQFP |
| 供應(yīng)商設(shè)備封裝： | 48-LQFP（7x7） |
| 包裝： | 標準包裝 |
| 配用： | 576-3864-ND - BOARD EVALUATION FOR KSZ8051MLL |
| 其它名稱： | 576-3888-6 |
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2009 Microchip Technology Inc.
DS22147A-page 51
MCP4017/18/19
8.3
Temperature Sensor Applications
Thermistors are resistors with very predictable
variation with temperature. Thermistors are a popular
sensor choice when a low-cost temperature-sensing
solution is desired. Unfortunately, thermistors have
non-linear characteristics that are undesirable, typically
requiring trimming in an application to achieve greater
accuracy. There are several common solutions to trim
& linearize thermistors. Figure 8-5 and Figure 8-6 are
simple methods for linearizing a 3-terminal NTC
thermistor. Both are simple voltage dividers using a
Positive Temperature Coefficient (PTC) resistor (R1)
with a transfer function capable of compensating for the
linearity error in the Negative Temperature Coefficient
(NTC) thermistor.
The circuit, illustrated by Figure 8-5, utilizes a digital
rheostat for trimming the offset error caused by the
thermistor’s part-to-part variation. This solution puts the
digital potentiometer’s RW into the voltage divider
calculation. The MCP4017/18/19’s RAB temperature
coefficient is a low 50 ppm (-20°C to +70°C). RW’s error
is substantially greater than RAB’s error because RW
varies with VDD, wiper setting and temperature. For the
50 k
Ω devices, the error introduced by RW is, in most
cases, insignificant as long as the wiper setting is > 6.
For the 2 k
Ω devices, the error introduced by RW is
significant because it is a higher percentage of RWB.
For these reasons, the circuit illustrated in Figure 8-5 is
not the most optimum method for “exciting” and
linearizing a thermistor.
FIGURE 8-5:
Thermistor Calibration using
a Digital Potentiometer in a Rheostat
Configuration.
The circuit illustrated by Figure 8-6 utilizes a digital
potentiometer for trimming the offset error. This
solution removes RW from the trimming equation along
with the error associated with RW. R2 is not required,
but can be utilized to reduce the trimming “window” and
reduce variation due to the digital pot’s RAB part-to-part
variability.
FIGURE 8-6:
Thermistor Calibration using
a Digital Potentiometer in a Potentiometer
Configuration.
NTC
VDD
VOUT
Thermistor
R1
R2
MCP4017
NTC
VDD
VOUT
Thermistor
R1
MCP4018
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| KSZ8051MNL | 功能描述:TXRX PHY 10/T100 3.3V MII 32-QFN RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:1,140 系列:AU 類型:收發(fā)器 驅(qū)動器/接收器數(shù):1/1 規(guī)程:CAN 電源電壓:5.3 V ~ 27 V 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SO 包裝:管件 其它名稱:935267940512AU5790D14AU5790D14-ND |
| KSZ8051MNL TR | 功能描述:以太網(wǎng) IC 3.3V, 10Base-T/100Base-TX Physical Layer Transceiver w/ MII Support (32-QFN) RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| KSZ8051MNL-EVAL | 功能描述:以太網(wǎng)開發(fā)工具 3.3V, 10Base-T/100Base-TX Physical Layer Transceiver w/ MII Support (32-QFN) - Evaluation Board RoHS:否 制造商:Micrel 產(chǎn)品:Evaluation Boards 類型:Ethernet Transceivers 工具用于評估:KSZ8873RLL 接口類型:RMII 工作電源電壓: |
| KSZ8051MNLI | 功能描述:TXRX PHY 10/T100 3.3V 32QFN RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:1,140 系列:AU 類型:收發(fā)器 驅(qū)動器/接收器數(shù):1/1 規(guī)程:CAN 電源電壓:5.3 V ~ 27 V 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SO 包裝:管件 其它名稱:935267940512AU5790D14AU5790D14-ND |
| KSZ8051MNLI TR | 功能描述:以太網(wǎng) IC 3.3V, 10Base-T/100Base-TX Physical Layer Transceiver with MII support (32-QFN, Industrial Grade) RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
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