- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄358934 > LPC47N252-SD (STANDARD MICROSYSTEMS CORP) Advanced Notebook I/O Controller with On-Board FLASH PDF資料下載
參數(shù)資料
| 型號： | LPC47N252-SD |
| 廠商： | STANDARD MICROSYSTEMS CORP |
| 元件分類： | 外設及接口 |
| 英文描述： | Advanced Notebook I/O Controller with On-Board FLASH |
| 中文描述： | MULTIFUNCTION PERIPHERAL, PQFP208 |
| 封裝： | TQFP-208 |
| 文件頁數(shù)： | 137/228頁 |
| 文件大?。?/td> | 1269K |
| 代理商： | LPC47N252-SD |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁當前第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁第169頁第170頁第171頁第172頁第173頁第174頁第175頁第176頁第177頁第178頁第179頁第180頁第181頁第182頁第183頁第184頁第185頁第186頁第187頁第188頁第189頁第190頁第191頁第192頁第193頁第194頁第195頁第196頁第197頁第198頁第199頁第200頁第201頁第202頁第203頁第204頁第205頁第206頁第207頁第208頁第209頁第210頁第211頁第212頁第213頁第214頁第215頁第216頁第217頁第218頁第219頁第220頁第221頁第222頁第223頁第224頁第225頁第226頁第227頁第228頁
If the internal or remote temperature reading is not within the low or high temperature limits, THERM# will be active
low. It will also be low for the diode pin conditions mentioned in the “External Temperature Measurement” section.
The THERM# pin will remain low while any of the Ambient Temp Error bit or the Remote Temp Error bit in Interrupt
Status 1 Register is set. The THERM# function can be selected by writing a ‘1’ to bit 2 of the Special Function
Register (0x4F). This pin is open-drain and requires an external pullup resistor. If more than one Hardware Monitor
Block is used on a system, only one can have this function enabled at one time since this will limit the SMBus
address to 0101101, unless external circuitry is provided.
The THERM# pin can be enabled to indicate out-of-limit/equal-limit voltages. Bit 3 of the Special Function register
(4Fh) is used to enable this option. When this bit is set, if one or more of the voltage readings is not within the low or
high limits, THERM# will be active low. This pin will remain low while the associated voltage error bit (+2.5v_Error,
Vccp_Error, +3.3v_Error, +5v_Error, +12v_Error, HVCC_Error, +1.5v_Error or +1.8v_Error) in the Interrupt Status
Register 1 and Interrupt Status Register 2 is set. The THERM# pin defaults to supporting out-of-limit/equal-limit
temperature events only.
The THERM# pin will remain low until Interrupt Status Register 1 and 2 are read. If the temperature or voltage
remains out of limit or equal to the limit, the THERM# will be re-asserted on the next monitoring cycle. THERM# can
also be cleared by issuing an Alert Response Address Call.
The THERM# pin may only become active while the monitor block is operational.
Implementation Note:
In designs using the Hardware Monitor Block of the LPC47M192, all the remote thermal diode inputs must be
properly terminated, even if one or both of the remote temperature sensor channels will not be used to actively
monitor temperatures. These inputs should be terminated with a thermal diode, a transistor or a resistor. If the
channel will never be used to monitor temperature, a resistor can used to allow for proper functioning of the nTHERM
pin. See application note “Using the Hardware Monitor Feature in SMSC Super I/O Devices” for more information.
Unused Analog Voltage Channel inputs should not be left unconnected. This is good design practice, and it will
guarantee proper functioning of the nTHERM pin, if the nTHERM pin is enabled to indicate voltage events. Any
Analog Voltage Measurement Channel that will not be used to actively monitor a power supply must be pulled up to
some nominal voltage. If the nTHERM pin is not enabled to indicate voltage events, unused Analog Voltage Channels
may be grounded.
SMSC DS – LPC47M192
Page 137
Rev. 03/30/05
DATASHEET
7.18.3.11 Input Safety
Since the power supply voltages will appear directly at the pins (1.5V – 12V), small external series resistors such as
470 ohm to 1k ohm (see Note) should be put into the lines driving the chip to prevent damaging the traces or power
supplies should an accidental short such as a probe connect two power supplies together. This value should be kept
as small as possible, since raising this resistor will start affecting the accuracy of the internal dividers. These resistors
are recommended, but not necessary.
Note
: The analog input channels on the LPC47M192 are calibrated for 500 ohm resistors. These optional external
resistors should not exceed 1k
.
7.18.3.12 Layout Considerations
To ensure accuracy when measuring analog signals, whether from a voltage divider or remote diode sensor, the
analog components should be located physically as close to the hardware monitoring block as possible. The
following is a list of precautions and suggestions to gain optimal performance from the hardware monitoring block.
1. Devices that are sources of noise, such as generators, data/address buses and CRTs should be kept as far
away from the hardware monitoring block as possible. (Approximately 4 to 8 inches is adequate).
2. The Dx+ and Dx- tracks should be kept close together, in parallel with grounded guard tracks on each side.
Using wide tracks will help to minimize inductance and reduce noise pickup. A 10 mil track minimum width
and spacing is recommended. See FIGURE 10.
GND
GND
D+
D-
10 mil.
10 mil.
10 mil.
10 mil.
10 mil.
10 mil.
10 mil.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LPC47N252-SG | Advanced Notebook I/O Controller with On-Board FLASH |
| LPC47M172-NR | ADVANCED I/O CONTROLLER WITH MOTHERBOARD GLUE LOGIC |
| LPC47N267-MN | 100 Pin LPC Notebook I/O with X-Bus Interface |
| LPC47N227-MN | 100 Pin Super I/O with LPC Interface for Notebook Applications |
| LPC47N227TQFP | 100 Pin Super I/O with LPC Interface for Notebook Applications |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LPC47N252-SG | 功能描述:輸入/輸出控制器接口集成電路 Advanced Notebook I/O Controller RoHS:否 制造商:Silicon Labs 產(chǎn)品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
| LPC47N254-AAQ | 制造商:SMSC 功能描述: |
| LPC47N267 | 制造商:SMSC 制造商全稱:SMSC 功能描述:100 Pin LPC Super I/O with X-Bus Interface |
| LPC47N267_05 | 制造商:SMSC 制造商全稱:SMSC 功能描述:100 Pin LPC Super I/O with X-Bus Interface |
| LPC47N267-MN | 功能描述:輸入/輸出控制器接口集成電路 Notebk I/O Contrllr RoHS:否 制造商:Silicon Labs 產(chǎn)品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
發(fā)布緊急采購，3分鐘左右您將得到回復。