DS2705K Maxim Integrated, DS2705K Datasheet - Page 6

• Manufacturer Part Number: DS2705K
• Description: Power Management IC Development Tools
• Manufacturer: Maxim Integrated
• Series: DS2705r

DS2705EVKIT+
The present state of all of the Configuration Register bits are displayed immediately upon opening the register
window by left-clicking on the View Configuration Register button. R/W locations contain a selection to allow the
user to determine their state. Pressing the Write button will write the new value to the register and then read the
register inside the DS2705 to verify the correct value was written.
The Copy button, as described below in the
Memory Access section, must still be left-clicked from the main window in order to store the new contents into
EEPROM.
Memory Access
The 8 byte Challenge, the 20 byte Response and the 2 byte Configuration Register are all stored in EEPROM of
the DS2705. Left-clicking on the Read or Write buttons transfers the values in the text boxes of the Challenge,
Response and Configuration Register to and from the SRAM of the device. Left-clicking on the Copy and Recall
buttons transfers the values between the SRAM and EEPROM of the device.
Authentication
Once the DS2705 has been configured appropriately, a DS2703 or DS2704 can be authenticated by connecting
the RJ-11 jack labeled as “MASTER” to the RJ-11 jack of a DS2703 EV Kit/DS2704 EV Kit board with a RJ-11
cord. A DS2704 EV Kit will require a battery or power supply. A DS2703K can be connected without any
additional connections.
An authentication attempt can be initiated in several methods depending on how the DS2705 is configured. When it
is initiated, the DS2705 will send out the Challenge and if the Response from the slave device is what is expected,
the DS2705 EV kit software will display PASS and the DS2705 EV Kit board will turn on a green LED. If the
authentication fails, FAIL will be displayed by the software and a red LED will be turned on.
DS2703 Interface
Connecting a DS2703 EV Kit board to the DS91213O with the RJ-11 phone cable, will cause the DS2703 Detected
Window to appear. This window allows the user to access some of the functionality of the DS2703.
The user can load a new Secret into the DS2703 by left-clicking on the Load Secret button. This will load the
values in the Secret text boxes into the DS2703. The user can also send the Compute Next Secret command by
left-clicking on the Compute Next Secret button. It is necessary to write the challenge prior to left-clicking the
Compute Next Secret button. A 15 volt programming pulse is required to change the Secret of the DS2703.
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