EM4170

Copyright

 2002, EM Microelectronic-Marin SA

9

www.emmicroelectronic.com

SEND PIN

In this mode after reception of the command, the chip receives the 32 bits of the ID and the 32 bits of the PIN. If the

received data are valid, the chip will answer an ACK and write the lock bit LB0 to 0; then it will send back the header (12

« 1 » and 4 « 0 ») followed by the ID. Then the chip returns to Stand-by Mode. If the ID or the PIN are not valid, the chip

sends back a NACK and return to Stand-by Mode.

The EM4170 might also return to Stand-by Mode without sending back a NAK if the incoming data is corrupted and / or

inconsistent.

As there is no check of the power supply before writing, the system has to assure that there is enough power received by

After a successful SEND PIN command, it is recommended to check the content of the word 1 with the UM1 command.

End

ID

Send

ACK

valid ?

Y

Write

LB0=0

Send

ID

Send

NAK

Send

header

End

N

Begin

Receive

Command

Receive

Receive

PIN

OUTPUT

INPUT

ACK

RM

command

ID

PIN

header

LIW

LIW

ID

Fig. 13

UM-MODE-2

In UM-Mode-2 the chip sends the 64 bits of UM2. It starts with MSB of Word 15 and finishes with LSB of Words 12. The

chip is using the same procedure than in ID-Mode, by sending the header before the data bits.

After completion the chip returns to Stand-by Mode.