Maxim Integrated │ 2

www.maximintegrated.com

Evaluates: DS18B20

DS18B20 Evaluation System

Procedure

The EV system is fully assembled and tested. Follow the

steps below to verify board operation:

1. Install the DS18B20GUISetup.msi software on your

computer.

2. Align the X2 connector (top row) of the USB2PMB2

with the J1 connector of the DS18B20 EV system.

3. Verify that the shunts are in the default position as

shown in Table 1.

4. Connect the USB cable from the PC to the USB2PMB2

board.

5. Open the EV system GUI, DS18B20EVKit.exe (Figure

1).

6. Click the

Scan Adapters button. Then select the

option

PMODxxxxxx (where xxxxxx is numeric) and

click the

Connect button.

7. Select the desired SCL clock frequency and click the

Set SCL button.

8. Select an address from the

Set Address dropdown

list and click the button to the right.

9. Click the

Search button and verify appropriate address

was found.

10. Start evaluating the DS18B20 by clicking on the

Sample Continuously button.

General Description of Software

The main window of the DS18B20 EV system software

contains controls to evaluate the DS18B20 IC.

Configuration

The configuration dropdown list allows the user to select

the conversion resolution. Use the Resolution drop down

list to select between 9-, 10-, 11-, and 12-bits resolution.

With each resolution, the user can set the desired sampling

rate using the options in the

Conversion Time dropdown

list.

Address

logic states of the AD_ pins. The GUI allows controlling

the states of the A_ pins by selecting the appropriate

checkboxes and setting the appropriate bits in the control

installed in the 1-3 position of jumpers J5 and J6. All other

shunt options on jumpers J5 and J6 would set the logic

levels to low or high.

ROM

Within the

ROM Commands groupbox, the controls

include Search ROM, read ROM, match ROM, skip ROM,

and alarm search.

Commands

Within the

Command groupbox, the controls include

temperature readings, write scratchpad, read scratchpad,

The

Read Scratchpad button will update the TH

(Temperature High), TL (Temperature Low), and

Configuration fields. The Copy Scratchpad button

will transfer the current data on the scratchpad to the

EEPROM. The

Recall E2 button recalls the data stored

on the EEPROM. Click

Read Scratchpad to retrieve

EEPROM data and the appropriate fields will update.

Table 1. Jumper Descriptions

*Default Position

JUMPER

SHUNT POSITION

DESCRIPTION

J2

Not installed

Disconnects J1-4 from SCL of the DS2482. External 1-wire option only.

Installed*

J3

1-2*

1-3

Connects J1-3 to DQ pin of the DS18B20. External 1-wire option only.

J4

Not installed*

Disconnects IO pin of the DS2482 from DQ pin of the DS18B20. External 1-wire option only.

Installed

J5

1-2

1-3*

Controls AD0 address pin of the DS2482 through GUI.

1-4

Connects AD0 address pin of the DS2482 to GND.

J6

1-2

1-3*

Controls AD1 address pin of the DS2482 through GUI.

1-4

Connects AD1 address pin of the DS2482 to GND.