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EVAL-ADM1022 Datasheet(PDF) 4 Page - Analog Devices

Part No. EVAL-ADM1022
Description  Evaluation Board for Microprocessor System Temperature Monitor
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EVAL-ADM1022 Datasheet(HTML) 4 Page - Analog Devices

 
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EVAL-ADM1022
–4–
REV. B
CONNECTORS, SWITCHES AND INDICATORS
The function of the various connectors, switches and indi-
cators on the evaluation board is explained below.
TEST CONNECTOR J4
Test connector J4 allows the serial data and clock lines of
the ADM1022 and the
THERM line to be monitored.
The connector also allows access to the VMON and GPI
lines.
Alternative external diode sensors may be connected be-
tween the D1 and D2 pairs of inputs.
CENTRONICS INTERFACE CONNECTOR J2
If the personal computer being used with the evaluation
board does not have a System Management Bus on the
motherboard, connection between the evaluation board
should be made via a parallel printer port, using the cable
provided. The connections to J2 are as follows:
TABLE 1. J2 CONNECTIONS
J2 Pin
ADM1022 Function
Parallel Port Function
2
Serial Clock (SCLK)
DB0
3
Serial Data In (SDA)
DB1
8
Manual Reset (MR)
DB6
10
Interrupt (INT)
ACK
13
Serial Data Out (SDA)
SLCT
19-30
Gnd
Gnd
SMBUS INTERFACE CONNECTOR J3
The SMBus interface connector J3 allows the evaluation
board to be connected directly to the SMBus of a personal
computer, using the DIMM interface card provided. To
make this connection, it may be necessary to remove one
of the DIMM memory modules on the PC motherboard,
if all DIMM sockets are occupied. This will affect the
BIOS setup and Windows 95, and should only be at-
tempted by a competent user.
REMOTE SENSOR SELECT SWITCHES SW4, SW3
Two remote sensors are provided on the evaluation board;
a 2N3904 and a 2N3906 transistor. Alternative remote
sensors may be connected between the D1 and D2 termi-
nals on the test connector J4.
TABLE 2. REMOTE SENSOR SELECT; SW4, SW3
SW4 Position
SW3 Position
Sensor Selected
1
2
OFF OFF
C
D1/D2(connector J4)
ON
-
A
2N3906 (D2)
-
ON
-
2N3904 (D1)
ON
ON
A
D1 and D2 selected
SERIAL BUS ADDRESS SELECT (SW2)
SW2 is used to set the two LSB’s of the ADM1022’s se-
rial bus address, A1 and A0. The ADD pin is tri-state and
can be grounded, left unconnected or tied to VCC. This
means a total of three addresses are possible. It should be
noted that the ADD pin is only read at power-up. If SW2
is changed while the ADM1022 is on, the change of ad-
dress will not be effective until the device has been pow-
ered off, and on again.
As the serial bus address is 7 bits, when storing it as an 8-
bit word it must be left or right justified, with either the
MSB or the LSB of the 8-bit word as zero. The
ADM1022 evaluation software stores the 7-bit serial bus
address as left-justified and makes the LSB zero. Table 3
shows the three possible addresses for the ADM1022.
TABLE 3. ADM1022 DEVICE ADDRESSES
SW2 Position
A1
A0
Device Address
A (Gnd)
1
0
5C (Hex)
B (NC)
0
0
58 (Hex)
C (Vcc)
0
1
5A (Hex)
VMON SELECT SWITCH, SW1
This switch allows the VMON pin to monitor either the on-
board 3.3V supply, an external 3.3V supply through con-
nector J4, or a larger external supply voltage through J4,
applied across voltage divider network R4, R5. Table 4
shows the relevant switch positions.
TABLE 4. VMON SELECT SWITCH, SW1
SW1 Position
Voltage Source (Vmon)
A
External 5V on J4
B
External 3.3V on J4
C
On-board 3.3V


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