SCS152 データシートの表示（PDF） - Microchip Technology

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SCS152

KEELOQ Token Card Chip

Microchip Technology 

SCS152

1.0 PIN DEFINITIONS

ISO

Pin Name

C1

VDD

C2

SCI

C3

SCK

C5

GND

C7

SDIO

I/O Type

Power

INPUT

INPUT

Power

Bidir (O.D.)

2.0 DEVICE OPERATION

During the life of the SCS152, it goes through the fol-

lowing stages:

• Manufacture and wafer probing

• Waffle pack and transportation

• Personalization and final application.

Various fields in the memory map must be initialized.

These include the first 24 bits in the memory map, the

transport code, and the mode bits. The first 24 bits in

the memory map typically identifies the device in its

final application. The device has two principle modes:

issuer mode and user mode. In issuer mode, all access

to the device (except one field) is blocked before a cor-

rect transport code has been presented to the device.

Thus, the transport code protects the device against

theft, before it is personalized.

During personalization, all fields, except (Chip

Identification Data (CID), are initialized for the intended

application: the device serial number is programmed,

the token counter is set to its proper value, the user

data field is initialized, and the transport code is erased

and replaced with a cryptographic key.

After power has been applied to the device, the I/O pin

is driven low. Once the reset period (TPOR) has expired,

the SCS152 is ready to accept commands. These com-

mands typically read the memory content serially. The

first bit at address 0 is initially driven on the I/O line.

Each read clock pulse increments the internal address

counter and reads the resulting bit from EEPROM. This

serial data stream is composed of various fields pre-

sented in Table 2-1.

Description

Power connection

Command input to the device controller

Command execution clock input

Power connection

Open drain serial data I/O line

TABLE 2-1:

EXTERNAL

REPRESENTATION OF THE

INTERNAL MEMORY MAP

Field

Name

Address

Size

Description

CID

0…23

SER

ISS

D4

D3

D2

D1

D0

CFG

USER0

UKEY0

24…63

64

65…71

72…79

80…87

88…95

96…103

104…107

108…147

148…211

212…275

24 Chip identification

data

40 Serial number

1 Issuer mode status

7 Digit 4

8 Digit 3

8 Digit 2

8 Digit 1

8 Digit 0

4 Configuration data

40 User area

64 Key area 0 which

also acts as the

transport code in

issuer mode

64 Undefined

2.1 CID Field

The device CID field contains a device identification

code, which is programmed during wafer probe and

cannot be changed later. These bits typically identify

the type of the device to the system in the application.

2.2 SER Field

The SER field contains the device serial number which

identifies the individual device. It is programmed while

the device is in issuer mode during the personalization

stage.

2.3 ISS Field

The ISS field indicates whether the device is in issuer

mode as determined by the CFG field. This is purely an

external view of the CFG field and exists as such for

compatibility reasons.

DS40150B-page 2

Preliminary

© 1997 Microchip Technology Inc.

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