AT88SC0204CA-MJ Просмотр технического описания (PDF) - Atmel Corporation

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AT88SC0204CA-MJ

Atmel CryptoMemory

Atmel Corporation 

2. Connection Diagram

Figure 2-1. Connection Diagram

2.7v - 5.5v

Microprocessor

2.7v - 3.6v

CryptoMemory

SDA

SCL

3. Pin Descriptions

3.1 Supply Voltage (VCC)

The VCC input is a 2.7V to 3.6V positive voltage supplied by the host.

3.2 Clock (SCL/CLK)

When using the asynchronous T = 0 protocol, the CLK (SCL) input provides the device with a carrier frequency f. The nominal

length of one bit emitted on I/O is defined as an “elementary time unit” (ETU) and is equal to 372/ f.

When using the synchronous protocol, data clocking is done on the positive edge of the clock when writing to the device and

on the negative edge of the clock when reading from the device.

3.3 Reset (RST)

The AT88SC0204CA provides an ISO 7816-3 compliant asynchronous answer-to-reset (ATR) sequence. Upon activation of

the reset sequence, the device outputs bytes contained in the 64-bit ATR register. An internal pull-up on the RST input pad

allows the device to operate in synchronous mode without bonding RST. The AT88SC0204CA does not support an ATR

sequence in the synchronous mode of operation.

3.4 Serial Data (SDA/IO)

The SDA/IO pin is bidirectional for serial data transfer. This pin is open-drain driven and may be wired with any number of

other open-drain or open-collector devices. An external pull-up resistor should be connected between SDA/IO and VCC. The

value of this resistor and the system capacitance loading the SDA/IO bus will determine the rise time of SDA/IO. This rise time

will determine the maximum frequency during read operations. Low value pull-up resistors will allow higher frequency

operations while drawing higher average power supply current. SDA/IO information applies to both asynchronous and

synchronous protocols.

Atmel AT88SC0204CA [Summary DATASHEET]

4

5202FS−CRYPTO−12/11

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