AT88SC153-10SI-00 Atmel, AT88SC153-10SI-00 Datasheet - Page 13

• Manufacturer Part Number: AT88SC153-10SI-00
• Manufacturer: Atmel

Specifications of AT88SC153-10SI-00

• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Package Type: SOIC
• Mounting: Surface Mount
• Pin Count: 8
• Operating Temperature Classification: Industrial
• Lead Free Status / Rohs Status: Not Compliant

Initialize Authentication
Verify Authentication
Device Operation
Clock and Data
Transitions
Start Condition
1016D–SMEM–04/04
Figure 10. Initiatize Authentication
Note:
The Initialize Authentication command sets up the random generator with the crypto-
gram (Ci), the secret seed (Gc), and the host random number (Q). Once the sequence is
completed and a stop condition is issued, there is a nonvolatile write cycle to clear a
new bit of the AAC. In order to complete the authentication protocol, the device requires
the host to perform an ACK polling sequence with the specific command byte of $B6,
corresponding to the Verify Authentication command.
Figure 11. Verify Authentication
Note:
If Q1 is equal to Ci + 1, then the device writes Ci + 2 in memory in place of Ci; this must
be preceded by the Initialize Authentication command. Once the sequence is completed
and a stop condition is issued, there is a nonvolatile write cycle to update the associated
attempts counter. In order to know whether or not the authentication was correct, the
device requires the host to perform an ACK polling sequence with the specific command
byte of $BD, to read the corresponding attempts counter in the configuration zone. A
valid authentication will result in the AAC cleared to $FF. An invalid authentication
attempt will initiate a nonvolatile write cycle, but no clear operation will be performed on
the AAC.
The SDA pin is normally pulled high with an external device. Data on the SDA pin may
change only during SCL-low time periods (Figure 13 on page 14). Data changes during
SCL-high time periods will indicate a start or stop condition as defined below.
A high-to-low transition of SDA with SCL high is a start condition that must precede any
other command (Figure 12 on page 14).
Q: Host random number, 8 bytes
Q1: Host challenge, 8 bytes
1
Q1(0)
Q1(1)
AT88SC153
Q1(7)
13