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AT88SC0104C-PU Datasheet(PDF) 9 Page - ATMEL Corporation

Part # AT88SC0104C-PU
Description  CryptoMemory 1 Kbit
Download  18 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT88SC0104C-PU Datasheet(HTML) 9 Page - ATMEL Corporation

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AT88SC0104C
2021HS–SMEM–04/07
Security Fuses
There are three fuses on the device that must be blown during the device personaliza-
tion process. Each fuse locks certain portions of the configuration memory as OTP
memory. Fuses are designed for the module manufacturer, card manufacturer and card
issuer and should be blown in sequence, although all programming of the device and
blowing of the fuses may be performed at one final step.
Protocol Selection
The AT88SC0104C supports two different communication protocols.
Smart Card Applications: The asynchronous T = 0 protocol defined by ISO 7816-3
is used for compatibility with the industry’s standard smart card readers.
Embedded Applications: A 2-wire serial interface is used for fast and efficient
communication with logic or controllers.
The power-up sequence determines which of the two communication protocols will be
used.
Asynchronous
T = 0 Protocol
This power-up sequence complies with ISO 7816-3 for a cold reset in smart card
applications.
•V
CC goes high; RST, I/O-SDA and CLK-SCL are low.
Set I/O-SDA in receive mode.
Provide a clock signal to CLK-SCL.
RST goes high after 400 clock cycles.
The device will respond with a 64-bit ATR code, including historical bytes to indicate the
memory density within the CryptoMemory family. Once the asynchronous mode has
been selected, it is not possible to switch to the synchronous mode without powering off
the device.
Figure 10. Asynchronous T = 0 Protocol (Gemplus Patent)
Synchronous
2-wire Serial Interface
The synchronous mode is the default after powering up V
CC due to an internal pull-up on
RST. For embedded applications using CryptoMemory in standard plastic packages,
this is the only communication protocol.
Power-up V
CC, RST goes high also.
After stable V
CC, CLK-SCL and I/O-SDA may be driven.
Vcc
I/O-SDA
RST
CLK-SCL
ATR


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