DS2460 Maxim, DS2460 Datasheet
DS2460
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DS2460 Summary of contents
Page 1
... GENERAL DESCRIPTION The DS2460 SHA-1 Coprocessor with EEPROM is a hardware implementation of the ISO/IEC 10118-3 Secure Hash Algorithm (SHA-1), eliminating the need to develop software to perform the complex SHA computation required for authenticating SHA devices and for performing the validation of digitally signed service data. The DS2460 communicates with a microcontroller through the popular I² ...
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... Lead Temperature (soldering 10s) Soldering Temperature (reflow) Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied ...
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... DS2460. The DS2460 communicates with a host processor through its I²C bus interface in standard-mode or in fast-mode. The logic state of three address pins determines the I²C slave address of the DS2460, allowing devices to operate on the same bus segment without requiring a hub. For more information (including Figure 2) refer to the full version of the data sheet ...
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... For this section (including Figure 3) please refer to the full version of the data sheet. DEVICE OPERATION The typical use of the DS2460 in an application involves writing, reading, running the SHA-1 engine, transferring secrets and comparing MACs. All these activities are controlled through the I²C serial interface. ...
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... Slave Address The slave address to which the DS2460 responds is shown in Figure 5. The logic states at the address pins AD0, AD1 and AD2 determine the value of the address bits A0, A2, and A4. The address pins allow the device to respond to one of eight possible slave addresses. The slave address is part of the slave-address/control byte. The last bit of the slave-address/control byte (R/W) defines the data direction. When set subsequent data will flow from master to slave (write access mode) ...
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Repeated START Condition Repeated starts are commonly used for read accesses to select a specific data source or address to read from. The master can use a repeated START condition at the end of a data transfer to immediately initiate ...
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... Application Information SDA and SCL Pullup Resistors SDA is an open-drain output on the DS2460 that requires a pullup resistor (Figure 10) to realize high logic levels. Because the DS2460 uses SCL only as input (no clock stretching) the master can drive SCL either through an open-drain/collector output with a pullup resistor or a push-pull output. ...
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... I²C Bus Compliance Although the I²C protocol definition does not explicitly forbid a START - STOP - START sequence, the DS2460 does not tolerate it START, STOP, START sequence has been issued, transmit the following sequence before communicating with the DS2460: START, 10xxxxxx byte (x = don’t care bits), ACK/NACK bit, STOP. ...
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... Maxim Integrated Products. Maxim is a registered trademark of Maxim Integrated Products, Inc. Abridged Data Sheet DESCRIPTION and changed specification value to 40 years minimum. RET specification. PROG the right to change the circuitry and specifications without notice at any time DS2460 PAGES CHANGED — ...