1
Note: This is a summary document. A complete document is
available under NDA. For more information, please contact your
local Atmel sales office.
Features
• Full TCG/TCPA V1.1b Compatibility
Single Chip Turnkey Solution
Hardware Asymmetric Crypto Engine
2048 RSA Sign in 500 ms Using CRT
AVR 8-bit RISC Microprocessor
Internal EEPROM Storage for 10+ RSA Keys
33 MHz LPC (Low Pin Count) Bus for Easy PC Interface
100 KHz System Management Bus (SMBus) Two-wire Interface
Secure Hardware and Firmware Design and Chip Layout
True Random Number Generator (RNG)
Secure Real-time Clock Option
3.3V ±10% Supply Voltage
28-lead TSSOP Package or 40-lead MLF Package
0–70°C Temperature Range
Description
The AT97SC3201 is a fully integrated security module designed to be integrated into
personal computers and other embedded systems. It implements version 1.1b of the
Trusted Computing Platform Alliance (TCPA) specification for Trusted Platform
Modules (TPM). This specification has been adopted by the Trusted Computing Group
(TCG).
The TPM includes a crypto accelerator capable of computing a 2048-bit RSA
signature in 500 ms and a 1024-bit RSA signature in 100 ms, both using CRT.
Communication to and from the TPM can occur through one of two interface
protocols: either a 33-MHz LPC interface or a 100-KHz SMBus two-wire interface.
Figure 1. AT97SC3201 Block Diagram
The chip includes a full hardware random number generator that is used for the TCG
protocol and is also available to the system for any random numbers it may need
during normal operation.
33 MHz
LPC
Interface
AVR
8/16 Bit
CPU
Physical
Security
Circuitry
SMBCLK/IOA
SMBus Interface
or GPIO
RTC
V
BB
32.768 kHz
RNG
Timer
ROM
Program
EEPROM
Program
EEPROM
Data
CRYPTO
Engine
SRAM
IOC
SMBDAT/IOB
Trusted
Platform
Module
AT97SC3201
Summary
Rev. 2015DS-TPM–7/04