EVAL-ADM1022 Datasheet, PDF(4/14 Page) Analog Devices – Evaluation Board for Microprocessor System Temperature Monitor

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EVAL-ADM1022 Datasheet, PDF (4/14 Pages) Analog Devices – Evaluation Board for Microprocessor System Temperature Monitor

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EVAL-ADM1022

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

Serial Clock (SCLK)

DB0

Serial Data In (SDA)

DB1

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

OFF OFF

D1/D2(connector J4)

ON -

2N3906 (D2)

- ON

2N3904 (D1)

ON ON

D1 and D2 selected

SERIAL BUS ADDRESS SELECT (SW2)

SW2 is used to set the two LSBâs of the ADM1022âs 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)

5C (Hex)

B (NC)

58 (Hex)

C (Vcc)

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)

External 5V on J4

External 3.3V on J4

On-board 3.3V

â4â

REV. B

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