LPC47B272-MS SMSC, LPC47B272-MS Datasheet - Page 122
![IC CTRLR SUPER I/O LPC 100-QFP](/photos/6/82/68212/qfp100-g1_pkg_sml.jpg)
LPC47B272-MS
Manufacturer Part Number
LPC47B272-MS
Description
IC CTRLR SUPER I/O LPC 100-QFP
Manufacturer
SMSC
Datasheet
1.LPC47B272-MS.pdf
(195 pages)
Specifications of LPC47B272-MS
Controller Type
I/O Controller
Interface
LPC
Voltage - Supply
3.3V
Current - Supply
15mA
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
100-QFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
638-1019
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LPC47B272-MS
Manufacturer:
ADI
Quantity:
957
Company:
Part Number:
LPC47B272-MS
Manufacturer:
Microchip Technology
Quantity:
10 000
Part Number:
LPC47B272-MS
Manufacturer:
SMSC
Quantity:
20 000
- Current page: 122 of 195
- Download datasheet (2Mb)
limit” of the RPM for the fan by programming the divisor and preload value accordingly. Typical practice
is to consider 70% of normal RPM a fan failure, at which point Term 1 in Equation 1 for the example
above will be 160. Therefore, the preload value is chosen to be 32 so that when the count reaches 192,
this will correspond to 70% of the normal RPM for the generation of a PME or SMI.
A representation of the logic for the fan tachometer implementation is shown below.
The following tables show examples of the desired functionality. Counts are based on 2 pulses per
revolution tachometer outputs with a default divisor of 2.
Pins 51 and 52 are the fan tachometer inputs, FAN_TACH2 and FAN_TACH1, respectively.
The configuration registers for the fan tachometer inputs are defined in the “Runtime Registers” section.
SMSC LPC47B27x
Divide by 1
Divide by 2
Divide by 4
Divide by 8
RPM
4400
3080
2640
2204
Select
Mode
Revolution
Time per
13.64 ms
19.48 ms
22.73 ms
27.22 ms
Nomina
32 kHz
l RPM
8800
4400
2200
1100
2” (Default) in Decimal
Term 1 for “Divide by
Revolution
Time per
13.64 ms
27.27 ms
54.54 ms
6.82 ms
Programmable
1, 2, 4, 8
112 counts
160 counts
186 counts
223 counts
Divider
DATASHEET
Preload
32
32
32
32
Latch on Read
Preload
Counter
- 122 -
Preload
Given Speed in
Counts for the
32
32
32
32
MSB
Decimal
144
144
144
144
(Term 1) + Preload
(maximum count)
Sync
Count =
144
192
218
255
RPM
6160
3080
1540
70%
770
To nPME
Logic
Revolution for
70% RPM
Time per
19.48 ms
38.96 ms
77.92 ms
Comments
9.74 ms
70% RPM
60% RPM
50% RPM
Rev. 04-17-07
Typical
RPM
Related parts for LPC47B272-MS
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![LAN83C183-JD](/images/no-image3.png)
Part Number:
Description:
FAST ETHERNET PHYSICAL LAYER DEVICE
Manufacturer:
SMSC Corporation
Datasheet:
![FDC37N769TQFP](/images/no-image3.png)
Part Number:
Description:
357-036-542-201 CARDEDGE 36POS DL .156 BLK LOPRO
Manufacturer:
SMSC Corporation
Datasheet:
![LPC47M102S-MC](/images/no-image3.png)
Part Number:
Description:
357-036-542-201 CARDEDGE 36POS DL .156 BLK LOPRO
Manufacturer:
SMSC Corporation
Datasheet:
![LPC47N267-MN](/images/no-image3.png)
Part Number:
Description:
357-036-542-201 CARDEDGE 36POS DL .156 BLK LOPRO
Manufacturer:
SMSC Corporation
Datasheet:
![USB20H04-JD](/images/no-image3.png)
Part Number:
Description:
4-PORT USB2.0 HUB CONTROLLER
Manufacturer:
SMSC Corporation
Datasheet:
![FDC37M602](/images/no-image3.png)
Part Number:
Description:
Manufacturer:
SMSC Corporation
Datasheet:
![FDC37B777](/images/no-image3.png)
Part Number:
Description:
Manufacturer:
SMSC Corporation
Datasheet:
![FDC37C672](/images/no-image3.png)
Part Number:
Description:
FDC37C672ENHANCED SUPER I/O CONTROLLER WITH FAST IR
Manufacturer:
SMSC Corporation
Datasheet:
![COM90C66LJP](/images/no-image3.png)
Part Number:
Description:
COM90C66LJPARCNET Controller/Transceiver with AT Interface and On-Chip RAM
Manufacturer:
SMSC Corporation
Datasheet:
![FDC37N869TQFP](/images/no-image3.png)
Part Number:
Description:
Manufacturer:
SMSC Corporation
Datasheet:
![USB97C100QFP](/images/no-image3.png)
Part Number:
Description:
Manufacturer:
SMSC Corporation
Datasheet:
![LPC47N227-MN](/images/no-image3.png)
Part Number:
Description:
Manufacturer:
SMSC Corporation
Datasheet:
![FDC37N869](/images/no-image3.png)
Part Number:
Description:
Manufacturer:
SMSC Corporation
Datasheet: