Microchip MIC384 Handleiding

Microchip Niet gecategoriseerd MIC384

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February 2002 1 MIC384 Evaluation Board
MIC384 Evaluation Board
DemoWare™ Software
General Description
The Micrel MIC384 evaluation board and DemoWare Soft-
ware demonstrate the operation and features of the MIC384
Three-Zone Thermal Supervisor. The MIC384 is a versatile
digital thermal supervisor capable of measuring temperature
using its internal sensor and two inexpensive external sen-
sors or embedded silicon diodes such as those found in
higher performance CPUs and FPGAs. This manual de-
scribes how to use the evaluation board and the companion
software.
Getting Started
What is 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 latest version of all Micrel
data sheets may be obtained from our website at
www.micrel.com.
Item Qty Description
1 1 MIC384 Evaluation Board with
Jumpers Installed
2 1 MIC384 Evaluation Board and
DemoWare Software Manual
(this document)
3 1 MIC384 Data Sheet
4 2 MIC384BM Samples
Table 1. Packing List
What You Must Provide
If the board is to be used with the MIC384 DemoWare, no
additional items are required except for a suitable host PC. All
power for the board will be drawn from the PC parallel port.
The board may be plugged directly into the DB25 connector
on the host PC. It may be more convenient, however, to use
a cable between the PC and the board. A standard, straight-
through, DB25 male-to-female parallel printer cable may be
used. If a non-PC host is used, the following items are
required for use with the MIC384 evaluation board:
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com• • • • • •
DemoWare is a trademark of Micrel, Inc.
SMBus is a trademark of Intel Corporation.
I2C is a trademark of Philips Electronics N.V.
ACCESS.bus is a trademark of the ACCESS.bus Industry Group.
IPort is a trademark of Microcomputer Control Corporation.
• 3.3V, 100mA regulated power supply
• Power supply leads or cables
• SMBus™/I2C™ compatible serial bus host for communi-
cation with the MIC384
• Cable for serial host connection, as appropriate
In either case, the following additional items are useful, but
not required:
• Logic probe(s)
• Voltmeter(s)
• SMBus/I2C bus analyzer
• Component cooling spray
• Heat gun
General Description of the Evaluation Board
This board demonstrates use of the MIC384 Three-Zone
Thermal Supervisor. It is designed to support rapid prototyping
of circuits employing the MIC384. Two MMBT3906 transis-
tors (surface mount equivalent to 2N3906) are included on
the board in order to demonstrate the MIC384’s ability to
measure the temperature of remote PN junctions. A connec-
tor permits use of an o-board remote diode or transistor in
place of either of the on-board remote transistors. User
congurable jumpers select the MIC384’s slave address and
congure the remote sensor connections. An LED on the
board reports the status of the interrupt request output, /INT.
The LED may be disabled by opening a jumper.
For use with Micrel’s DemoWare demonstration software, the
MIC384 evaluation board may be connected directly to a PC
parallel port via a DB25M connector. As an option, the user
may install a 4-pin ACCESS.bus™-type connector to inter-
face the evaluation board with a serial bus host such as the
IPort™ I2C Host Adapter from MCC Corporation. An addi-
tional general-purpose 8-pin header can also be used to
interface any I2C/SMBus host to the board.
MIC384 Evaluation Board and DemoWare Software Micrel
MIC384 Evaluation Board 2 February 2002
Test
Points
Micrel, Inc.
408-944-0800
MIC384 Evaluation Board
I
N
T
S
C
L
S
D
A
G
N
D
V
D
D
A
0
C
R
I
T
Q2
P3
JP4
P4 J1
/INT
JP2
JP3
A0
P2
JP1
P1
U1
PC
PARALLEL
PORT
/INT
SCL
General-Purpose
Signal Header
Optional
SMBus Host
Connector
SDA
GND
TEST
VDD
EXT
VDD IN
Remote
O-Board Sensor
Connection
Remote Diode
Selection
Jumpers
PC Parallel Port Connector
Remote
O-Board Sensor
Connection
Remote Diode
Selection
Jumpers
Address
Conguration
Jumpers
Q1
Figure 1. MIC384 Evaluation Board
Powering the Board
The MIC384 evaluation board can be powered via the host
PC’s parallel printer port or an external power supply. Three
options are available for powering the evaluation board.
Option 1: For use with Micrel s DemoWare demonstration’
software and a host PC, connect the board to the PC s parallel’
printer port via the DB-25M connector (refer to schematic in
“ ”Hardware Reference ). Pins 1 and 2 of P3 should be shorted.
Option 2: The board can be powered by an external power
supply via TP1, EXT VDD , and TP2, . The positive“ ” “ ”GND
connection should be made to TP1 and ground connection
should be made to TP2. Pins 2 and 3 of P3 should be shorted.
Option 3: The board can be powered by a serial bus host
such as the MCC IPort via optional user-installed 4-pin Molex
connector J1. Pin 3 of this connector is assigned to carry the
power supply voltage from the host (See Figure 2). Pins 2 and
3 of P3 should be shorted.
Serial Bus Host Connector
The optional user-installed SMBus host connector is Molex
part #15-83-0064 shown in Figure 2. This Molex connector is
a 4-conductor shielded receptacle. The pinout of this connec-
tor is shown below. The mating connector is a Molex part #15-
83-1564. See Appendix A for more information on these
connectors. The serial bus signals are also present on single-
row header P4 and at test points TP4 and TP5. One or more
of these connection points can be used in lieu of the special-
ized connector. The various serial bus connection points are
summarized in Table 2.
FRONT
Molex 15-83-0064
CLK VDD DATA GND
4 3 2 1
Figure 2. Pinout of J2 Serial Bus Host Connector
February 2002 3 MIC384 Evaluation Board
MIC384 Evaluation Board and DemoWare Software Micrel
Molex
15-83-0064
Signal Pin # P4 Pin # Test Point
Serial Data 2 1 TP5
Serial Clock 4 2 TP4
VDD 3 8 TP1
GND 1 4 TP2
/INT N/A 3 TP6
Table 2. Serial Bus Connection Points
Personal computer based host adapters, cables, bus analyz-
ers and other useful items can be obtained from the sources
listed in Appendix A.
Slave Address Selection
The MIC384 slave address must be established for commu-
nication with the serial bus host. It is established by setting the
address pin A0 to either logic or logic . Table 3 shows the‘ ’1‘ ’0
jumper settings for selecting the slave address. The slave
address of MIC384 is registered only during power-on and
cannot be changed during operation. To change the MIC384
slave address, remove power, establish the new slave ad-
dress and then reapply power.
Remote Diode Selection
The MIC384 senses the temperatures of remote PN junction
connected to the T1 pin and T2 pin. This PN junction is
generally either a diode-connected bipolar junction transistor
or the embedded thermal diode inside an integrated circuit.
Diode-connected 2N3906-type transistors, Q1 and Q2, are
provided on the evaluation board. Header P1 and P2 can be
used to connect to an o-board diode. Jumper JP1 selects
between Q1 and the sensor connected to P1. Similarly
jumper JP2 selects between Q2 and the sensor connected to
P2. (Refer to Table 3.)
Figure 3 shows several examples of remote diode connec-
tions. To minimize noise pickup, connections to an o-board
diode should be made using twisted-pair or shielded twisted-
pair cable. Connections longer than a few inches or any
connection in an electrically noisy environment should use
shielded twisted-pair cable for optimal performance. (Note
that the shield should be grounded only at P1/P2 on the
evaluation board.) Suitable cable types include Belden s part’
number 8442 unshielded twisted-pair (UTP) and Belden’s
part number 8451 shielded twisted-pair (STP).
If using a transistor, the base and collector should be shorted
together
at the transistor
. The emitter and base-collector
terminals are then connected to P1/P2. The emitter is con-
nected to pin 2 of P1/P2; the base-collector junction should be
connected to pin 1 of P1/P2.
LED Indicator
The LED on the evaluation board indicates the state of the /
INT output. When an interrupt is generated by the MIC384,
the signal at the /INT output pin goes from high to low. This
causes the /INT LED to turn on. The /INT LED will turn o once
the interrupt gets cleared. The LED indicator can be deacti-
vated by opening jumper JP4. JP4 enables the /INT LED
when shorted; opening the jumper disables the LED.
Factory Settings
The slave address is set to 1001000b=48h and remote on-
board diodes Q1 and Q2 are connected to T1 and T2
respectively.
P
N
P1/P2
B
E
C
Twisted-Pair Cable
Typical PNP bipolar
transistor used as
remote sensor
Figure 3a. Remote Diode Connections via P1/P2
P
N
P1/P2
B
E
C
Shielded Twisted-Pair Cable
Typical PNP bipolar
transistor used as
remote sensor
Figure 3b. Remote Diode Connections via P1/P2
P
N
P1/P2
B
E
C
Twisted-Pair Cable
or
Shielded Twisted-Pair Cable
(shielded twisted-pair cable shown)
Embedded
thermal diode
(in CPU, etc.)
Figure 3c. Remote Diode Connections via P1/P2
Jumper Settings Sensor MIC384 Slave Address
JP1 JP2 JP3 T1 T2 Binary Hex
2-3 2-3 Shorted Q1 Q2 100 1000b48h
1-2 2-3 Shorted Off-board via P1 Q2 100 1000b48h
2-3 1-2 Shorted Q1 Off-board via P2 100 1000b48h
1-2 1-2 Shorted Off-board via P1 Off-board via P2 100 1000b48h
2-3 2-3 Open Q1 Q2 100 1001b49h
1-2 2-3 Open O-board via P1 Q2 100 1001b49h
2-3 1-2 Open Q2 O-board via P2 100 1001b49h
1-2 1-2 Open Off-board via P1 Off-board via P2 100 1001b49h
Table 3. MIC384 Slave Address Conguration

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: MIC384

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