Atmel AT88SC1616C [SUMMARY DATASHEET]

2030LS

−CRYPTO−12/11

10

8.

Security Fuses

There are three fuses on the device that must be blown during the device personalization 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.

9.

Protocol Selection

The AT88SC1616C supports two different communication protocols.

The asynchronous T = 0 protocol defined by ISO 7816-3 is used for compatibility with the industry’s standard smart

card readers

A two-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.

9.1

Asynchronous T = 0 Protocol

This power-up sequence complies with ISO 7816-3 for a cold reset in smart card applications.

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 9-1.

Asynchronous T = 0 Protocol (Gemplus Patent)

Vcc

I/O-SDA

RST

CLK-SCL

ATR