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PDF SCS152 Data sheet ( Hoja de datos )
| Número de pieza | SCS152 | |
| Descripción | KEELOQ Token Card Chip | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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M
SCS152
Token Card Chip
FEATURES
DIE LAYOUT
• ISO 7816-3:1989 “Answer to Reset” compatible
for synchronous cards
• Industry standard 4406 command set compatible
• Extended commands:
- Combined WRITE and
ERASE-WITH-CARRY function
- Cryptographic signature of the EEPROM
contents and challenge
• 40-bit user programmable area with lock bit
• 64-bit cryptographic key
• 64-bit transport code
• 33352 token units (788888)
• Internal protection against token counter value
corruption (anti-tearing)
GND
SDIO
BLOCK DIAGRAM
VDD
SCI
SCK
DESCRIPTION
ADDRESS
GENERATION
EEPROM
The SCS152 is
circuit intended
afothr iprdregpeanideraatpiopnlictaotkioennsc.aTrydpiinctDaelagartaaptpSelidh-eet4U.comVDD
cations of the SCS152 include disposable telephone
GND
cards, vending machine cards, low value debit cards,
access control, and authentication.
SIGNATURE
CALCULATOR I/O SDIO
The SCS152 incorporates several security features,
including an internal signature function and a long
transport code. The SCS152 has two modes – issuer
mode and user mode. During wafer testing, it is placed
in issuer mode for card manufacturing and transporta-
SCI
SCK
CONTROLLER
tion to the issuer. In issuer mode, the transport code is
needed to program the device and, thus, is protected
A correct signature indicates that the memory contents
from unauthorized use before personalization by the
have not been altered. It can therefore be used to check
issuer.
the serial number, or that changes to the token counter
During personalization, a cryptographic key, unique to
have actually occurred.
the card, is programmed into EEPROM. This key can
Programming the token counter uses a special circuit to
not be read. The system using the card must be able to
ensure that the programming will either be complete or
determine what key was programmed from examining
will not happen at all, if the external supply is suddenly
the memory map (i.e., not the token counter) containing
removed.* This is called Fail Safe Programming™,
the issuer and serial number information.
and, when used in conjunction with the extended write
The signature function computes an 8-bit value based
on a system supplied value (challenge) and the visible
and erase command, removes the need for special
‘tear-out’ protection to be performed by the reader.
memory map. Because of the nature of the signature
function and the fact that the key is not known outside
the system, it is practically impossible to predict the
Note: The fail safe feature only works in the token
counter area.
value which the signature will compute.
DataShee
DataSheet4U.comK*PEaEtLeOnQts
is a registered
applied for.
trademark
of
Microchip
Technology
Inc.
© 1997 Microchip Technology Inc.
DataSheet4 U .com
Preliminary
DS40150B-page 1
1 page  
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SCS152
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3.1 Access Conditions
TABLE 3-2:
Field
CID
SER
O4…O1
O0
CFG
USER0
ACCESS CONDITIONS IN ISSUER MODE
RDBIT
BITPROG
Y F and TC
Y TC
Y TC and Z
Y TC and Z
Y TC
YY
UKEY0
‘1’
TC
ERASE
N
N
TC and B
N
N
Y
TC
Extended Commands
test modes
BITPROG
DECR-ERASE: TC and Z
N
test modes
BITPROG
BITPROG
test modes
SIGN: Y
TABLE 3-3:
Field
CID
SER
O4…O1
O0
CFG
USER0
ACCESS CONDITIONS IN USER MODE
RDBIT
BITPROG
YN
YN
YZ
YZ
YY
YL
UKEY0
‘1’
N
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ERASE
N
N
B
N
N
L
N
Extended Commands
test modes
BITPROG
DECR-ERASE: Z
N
test modes
BITPROG
BITPROG
test modes
SIGN: Y
The condition codes are:
•Y
•N
• TC
• ‘1’
•F
•Z
•B
•L
• BITPROG
Command always allowed
No access allowed and it is converted into a RDBIT command
Transport code must be submitted before the operation is allowed
Output always logic high in this field
Command allowed if the fuse is not blown
The digit code is nonzero
Command allowed if previous operation was BITPROG and was successfully
Command allowed if LOCK0 bit in the CFG field is ‘1’
The BITPROG condition is checked and executed
Note 1: If the access condition does not allow a command that modifies the EEPROM (i.e., BITPROG, ERASE or
DECR-ERASE), it will be converted into a RDBIT command.
2: The commands that can potentially change the EEPROM (even if it is converted into a RDBIT command) do
not increment the I/O address counter.
3: Any command that modifies the EEPROM checks the internal high voltage sensor during the programming
and goes into the standby state if the sensor indicates the internal high voltage was not high enough. Power
must be removed to clear this condition.
4: If the device is not in issuer mode and not in user mode, only BITPROG access is allowed to the CFG field.
DataShee
DataSheet4U.com
© 1997 Microchip Technology Inc.
DataSheet4 U .com
Preliminary
DS40150B-page 5
5 Page 
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SCS152
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5.0 COMPATIBILITY WITH
INDUSTRY STANDARD
DEVICES
The RESET and RDBIT commands meets the require-
ments of ISO 7816-3 for the ‘Answer-to-Reset’
sequence for synchronous chip cards.
The basic counter modification commands BITPROG
and ERASE correspond with the WRITE and
ERASE-WITH-CARRY commands of industry standard
devices. However, industry standard devices use eight
bits to represent each digit, and a WRITE command will
program the current bit to ‘0’.
The application can, therefore, decrement a digit by
programming any of the eight bits to ‘0’, whereas with
the SCS152, any BITPROG command will always
decrement the current digit value. If the application
decrements each digit as described above, the WRITE
command will appear to program the current bit to ‘0’.
Thus, while the SCS152 will accept and interpret the
commands correctly, the changes to the memory map
will only correspond to that of the other cards, if the first
‘1’ in a digit field is always programmed ‘0’ with a
WRITE command.
5.1 Fail Safe Counter Update
The carry is performed by a BITPROG, followed by an
ERASE. This process first deducts a number of tokens
(the BITPROG command) and then adds some again
(with the ERASE command), but never more than pre-
viously deducted with the BITPROG command. If the
device is pulled from the reader between the BITPROG
and ERASE commands, the user may lose many
tokens.
This situation can be avoided by substituting the
DECR-ERASE command whenever a sequence of
BITPROG and ERASE commands are needed to
update the token counter (Step 5c in Section 4.2). This
will modify the contents of the EEPROM in one indivis-
ible operation that will either complete or not modify the
EEPROM in any way, if external power is removed early
on during the EEPROM programming.
For example, if digit field D3 contains the value ‘6’, it will
be read out as 00111111. If a BITPROG command is
issued anywhere in D3, its value will be decremented to
‘5’, and it will always read out as 00011111, regardless
of which address in the digit the BITPROG command
was issued.
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The ISS is only an external view of the CFG field and
cannot be changed. A BITPROG command at this
address will actually decrement digit D4. It should also
be noted that the address counter appears to wrap from
275 back to 0, which differs from other similar devices.
DataShee
DataSheet4U.com
© 1997 Microchip Technology Inc.
DataSheet4 U .com
Preliminary
DS40150B-page 11
11 Page | ||
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| PDF Descargar | [ Datasheet SCS152.PDF ] | |
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