Microchip MIC74 Handleiding

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August 2000 1 MIC74
MIC74 Evaluation Board
SMBusâ„¢ I/O Expander and Fan Controller Evaluation Board
General Description
This evaluation board demonstrates use of the MIC74 Serial
I/O expander and fan controller. It is designed to support rapid
prototyping of circuits employing the MIC74 as an I/O ex-
pander and/or a fan speed controller. Support is included for
dual power supplies in order to demonstrate the 5V-tolerant
I/O capabilities of the MIC74. An MIC5205 150mA LDO
regulator can be congured to supply 3.3V to the MIC74 while
the other circuitry is supplied from a single external 5V supply.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
SMBusâ„¢ is a trademark of Intel Corporation.
I2Câ„¢ is a trademark of Philips Electronics, N.V.
IPortâ„¢ and Message Managerâ„¢ are trademarks of Microcomputer Control Corporation.
User congurable jumpers allow each of the MIC74’s I/O lines
to be used as an input or output, or the high-order lines can
be congured for fan speed control. An MIC29152, a high-
current low-dropout regulator, is included to drive common
12V brushless DC fans.
A 4-pin connector is provided to interface the evaluation
board with a serial bus host such as the IPortâ„¢, an I2Câ„¢ Host
Adapter from MCC Corp. This connector is commonly used
for interoperability testing among SMBusâ„¢ or ACCESS.bus
hosts and peripherals. For more information regarding the
IPortâ„¢ I2Câ„¢ Host Adapter and the I2Câ„¢ Message Man-
agerâ„¢ Software, see Appendix A.
J5
GND
J1
5V
A0
A1
A2
I0
I1
I2
I3
I4
I5
I6
I7
JP21
J6
GND
JP22
TP1 TP2 TP3
/SHDN
/FS0
/FS1
/FS2
J2
VDD
LED0
LED7
U1
J3
12V
J4
VOUT
JP20
MIC74BSM-16
Ground Host connections
Slave address
jumpers
JP17 - JP19
Input jumpers
JP1 - JP8
+
Fan
terminals
-
Fan
supply
terminal
+5V
Input
+2.7 - 3.3V
Input
Output
jumpers
JP9 - JP16
& LEDs
07
Fan mode
jumpers
JP23 - JP26
JP20
JP21
Ground
MIC
29152BU
0000 X
TP1
(DATA)
TP2
(CLOCK)
TP3
(/ALERT)
CON1 JP22
MIC74 Evaluation Board Jumper and Connector Layout
MIC74 Evaluation Board Micrel
MIC74 2 August 2000
IN
EN
GND
OUT
BYP
P7/FS2
P6/FS1
P3
P2
P1
P0
P5/FS0
P4/SHDN
MIC5205-3.3BM5
IN
EN
GND
OUT
FB
MIC29152BU
VDD
CLK
DATA
/ALERT
A2
A1
A0
GND
R10
3.3k
R
FB
3.01k
R
MIN
1k
R
F0
3.6k
R
F1
1.8k
R
F2
1k
R2–R9 1kΩ
C3
22µF
20V
U1 MIC74BMM
4
6
8
10
12
14
16
18
20
123
12
12
21
2
1
1
3
1 3
1 3
1 3
1 3
1 3
1 3
1 3
21
21
21
21
21
21
21
3
21
5
7
9
11
13
15
17
19
TP2
JP22
Molex
TP1
TP3
JP21
JP20
JP17
JP18
JP1
A0
A1
JP19
A2
IN0
JP9
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
JP10
JP11
JP12
LED0
R9
LED1
R8
LED2
R7
LED3
R6
LED4
R5
LED5
R4
LED6
R3
LED7
R2
JP13
JP14
JP15
JP16
/SHDN
JP23
JP2
IN1
JP3
IN2
JP4
IN3
JP5
IN4
JP6
IN5
JP7
IN6
JP8
IN7
SMB_C
+5V
SMB_D
GND
C4
2.2µF
10V
J1
+5V
J4
VOUT
J6
GND
J3
+12V
J5
GND
R16
1.8k
J2
VDD
16 12
14 11
15 10
13 9
3 7
2 6
1 5
8 4
R1
10k
C5
0.01µF
C2
0.01µF
C1
0.01µF
CON1
2
2
2
2
2
2
2
2
4
5
3
1
2
21
/FS0
JP26
21
/FS1
JP25
21
/FS2
JP24
123
123
4
3
2
1
Figure 1. Evaluation Board Schematic
August 2000 3 MIC74
MIC74 Evaluation Board Micrel
Powering the Board
The MIC74 evaluation board supports the use of dual power
supplies in order to demonstrate and make use of the
MIC74’s voltage-tolerant I/O capability. The LED indicators
can be powered from a 5V supply while the MIC74 is powered
from a lower voltage (2.7 to 3.6V). The MIC29152 linear
regulator in the optional fan control section requires a third,
higher voltage power supply. Three options are available for
powering the digital section of the evaluation board. Note that
in all cases, the pull-up resistors on /ALERT and the serial
data line are connected to the supply voltage present at J1.
Option 1
: An MIC5205-3.3BM5 linear regulator, U2, permits
powering the board from a single 5V power supply connected
to J1 when a shorting block is installed at location JP20. The
MIC5205 generates the lower voltage (3.3V) required by the
MIC74 and feeds its VDD input via JP20. The LED s indicators’
on the board are powered from the 5V supply connected to
J1. JP21 should be removed or the 5V supply will be fed to pin
3 of the serial bus connector, CON1. Note that the pull-up
resistors on /ALERT and the serial data line are connected to
the supply voltage present at J1. The 3.3V output of U2 will
be present at J2.
Option 2
: The board can be powered via CON1 by a single
5V power supply connected to pin 3 when a shorting block is
installed at locations JP20 and JP21. The MIC5205 gener-
ates the lower voltage (3.3V) required by the MIC74 and
feeds its VDD input via JP20. The supply voltage applied at
CON1 will also be present at J1. The LED s indicators on the’
board are powered from the 5V supply connected to CON1.
The pull-up resistors on /ALERT and the serial data line are
connected to the supply voltage present at pin 3 of CON1.
The 3.3V output of U2 will be present at J2.
Option 3
: A single power supply between 2.7V and 3.6V can
power the entire evaluation board via J1 and J2. J1 and J2
should be connected together and JP20 is removed. This
isolates the MIC5205 from the circuit and ties both sections
together. The LED indicators will be powered from the same
supply as the MIC74. JP21 should be removed or the supply
voltage will be fed to pin 3 of the serial bus connector, CON1.
Note that the pull-up resistors on /ALERT and the serial data
line are connected to the supply voltage present at J1.
These options are summarized in Table 2. For each case, the
terminal used as the power supply input is highlighted in bold.
Getting Started
What’s Included
Review the packing list in Table 1 to conrm that you received
all listed items. If any of the items are missing or damaged,
contact Micrel Semiconductor. The absolute latest version of
all Micrel device datasheets may be obtained from our
website at www.micrel.com.
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Table 1. Packing List
What You Must Provide
The following items are required for use with the MIC74
Evaluation Board:
• 5V, 100mA regulated power supply
• Power supply leads or cables
• SMBus/I2C compatible serial bus host for com-
munication with the MIC74
• Cable for serial host connection
• 12V-power supply rated to deliver the required
fan current*
• 12V brushless DC fan rated at no more than 1.5A
maximum*
* Required only for fan control applications
The following additional items are useful, but not required:
• Logic probe(s)
• Voltmeter(s)
• SMBus/I2C bus analyzer
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Table 2. Options for Powering the Evaluation Board

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: MIC74

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