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PDF AT90SP0801 Data sheet ( Hoja de datos )
| Número de pieza | AT90SP0801 | |
| Descripción | Secure Signature Generation Chip | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• Secure Computation of Public Key Signatures
• Secure Storage and Decryption of Symmetric Keys
• On-chip Cache for Frequently Used Keys
• SMBus Communications Port
• On-board Public Key Computation Engine and Microprocessor
• Physical and Logical Security Measures to Inhibit Attacks
• 20-lead SOIC Package, 0°C to +70°C Operating Range
• 3.3V ±10% Supply Voltage
Description
The AT90SP0801 is used to perform cryptographic operations, using asymmetric pri-
vate keys stored in its internal EEPROM. An arbitrary number of private keys can be
stored externally and decrypted by the chip when required. Communication to the sys-
tem processor is via the SMBus.
Figure 1. Pin Configuration
Secure
Signature
Generation Chip
AT90SP0801
Name Description
RESET Reset Input, Active-low
SCL SMBus Clock
SDA
SMBus Data
GND Ground
CLKIN Input Clock
VCC
Operating Voltage
TEST Do Not Connect
Summary
28-lead TSSOP
RESET
NC
NC
NC
NC
NC
SCL
SDA
NC
NC
NC
GND
NC
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 NC
27 NC
26 VCC
25 NC
24 NC
23 NC
22 NC
21 NC
20 CLKIN
19 TEST
18 TEST
17 NC
16 NC
15 NC
28-lead SOIC
RESET
NC
NC
NC
NC
SCL
SDA
NC
NC
GND
1
2
3
4
5
6
7
8
9
10
20 VCC
19 NC
18 NC
17 NC
16 NC
15 CLKIN
14 TEST
13 NC
12 NC
11 TEST
Rev. 1495AS–01/02
Note: This is a summary document. A complete document is
available under NDA. For more information, please contact your
local Atmel sales office.
1 page  
AT90SP0801
Data is sent least significant byte first. In some circumstances, there may be no data,
only crc.
Depending on the value of ss, the crc bytes may or may not be included.
The two sequence bits s1-0 within the command code tell the chip how to relate this
transfer to previous and subsequent transfers.
S0 if set to a 1 indicates that this is the first transfer to the buffer and that data0 should
go into buffer address 0 and so on. If this bit is set to a 0, then data0 will be stored in the
next location within the buffer after that from the previous transfer. When set, this bit
also resets the CRC generator.
S1 if set to a 1 indicates that this is the last transfer to the buffer. If set to a 0, the chip
must have previously executed a command where s0 was set to a 1. When s1 is set to a
1, the last two bytes of the information transferred in this block are a CRC value. The
chip will NACK the crc1 byte, if the value sent does not match that computed on the
incoming data. The CRC bytes may not be split across two blocks.
For instance, to write password information (64 bytes) to the chip, the following
sequence of three write commands would be used (assuming 32 byte loads). The
ACKs, NACKs and STOP conditions have been ignored for clarity.
S
01010000
01000000
00100000
data0
S
01010000
00000000
00100000
data32
S
01010000
10000000
00000010
crc0
data1
data33
crc1
data2
data34
...
...
data31
data63
For shorter data transfer values, it is perfectly legal for both s0 and s1 to be set. This indi-
cates that the entire transfer is taking place in a single block access. As an example of
this, the following command would write a single byte to the buffer:
S 01010000 11000000 00000011 data0 crc0
crc1
The chip will NACK writes that attempt to write into the chip beyond the internal buffer,
which may be as short as 320 bytes.
1495AS–01/02
5
5 Page 
Packaging Information
20S, 20 Lead, 0.300" Wide,
Plastic Gull Wing Small Outline (SOIC)
Dimensions in Inches and (Millimeters)
PIN 1
0.020 (0.508)
0.013 (0.330)
0.299 (7.60) 0.420 (10.7)
0.291 (7.39) 0.393 (9.98)
.050 (1.27) BSC
0.513 (13.0)
0.497 (12.6)
0.105 (2.67)
0.092 (2.34)
0.012 (0.305)
0.003 (0.076)
0
REF
8
0.035 (0.889)
0.015 (0.381)
0.013 (0.330)
0.009 (0.229)
28A, 28-lead, 6.1mm Wide, Thin Shrink Small
Outline Package (TSSOP)
Dimensions in Inches and (Millimeters)
.0075" (0.19)
.0118" (0.30)
.236" (6.0)
.224" (6.2)
.319" (8.1) BSC
0˚
REF
8˚
.026" (0.65) BSC
.378"(9.6)
.386"(9.8)
.043" (1.10) MAX
.002" (0.05)
.006" (0.15)
.020" (0.50)
.030" (0.75)
.0035" (0.09)
.0079" (0.20)
11 AT90SP0801
1495AS–01/02
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AT90SP0801.PDF ] | |
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