This is a summary document.
The complete document is
available on the Atmel website
at www.atmel.com.
Atmel-8858AS-CryptoComp-AT88SC118-Datasheet-Summary_042013
Features
Atmel® CryptoCompanion Device to Atmel CryptoRF® and Atmel CryptoMemory®
Securely implements Host algorithms
Securely stores Host secrets
Verifies Host firmware digests
High security features in hardware
CryptoMemory and CryptoRF F2 Algorithm
SHA-1 standard cryptographic algorithm
64-bit Mutual Authentication Protocol (Under License of ELVA)
Permanently coded serial numbers
High quality Random Number Generator (RNG)
Metal shield over memory
Data scrambling in nonvolatile memory
Delay penalties to prevent systematic attacks
Reset locking to prevent illegal power cycling
Voltage and frequency monitors
Host-side crypto functions
Authentication challenge generation
Device challenge response
Message Authentication Codes (MAC) generation
Data encryption and decryption
Secure authentication key management
Secure storage and key management
Up to 16 sets of 64-bits diversified Host keys
Eight sets of two 24-bit passwords
Secure and custom personalization
Up to 232-byte Read/Write configurable user data area
Nonvolatile up counters
Four sets unidirectional counters
6.4 million maximum counts per counter
Application features
Low voltage supply: 2.7V – 3.6V
2-Wire Serial Interface (TWI, 5V compatible)
Standard 8-lead SOIC plastic package, green compliant (exceeds RoHS)
High reliability
Endurance: 100,000 cycles
Data retention: 10 years
ESD protection: 3,000V min. HBM
Atmel AT88SC118
CryptoCompanion Device for
CryptoRF and CryptoMemory Products
SUMMARY DATASHEET
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Atmel AT88SC118 [Summary Datasheet]
Atmel-8858AS-CryptoComp-AT88SC118-Datasheet-Summary_042013
1. Product Overview
The CryptoCompanion is designed as the mate to the CryptoRF (CRF) and CryptoMemory (CM) devices, collectively
referred to in the remainder of this document as CRF.
The CryptoCompanion makes extensive use of the SHA-1 hash algorithm as specified in
http://www.itl.nist.gov/fipspubs/fip180-1.htm and elsewhere. In this document, the nomenclature SHA-1(a, b, c) means to
concatenate a, b, and c in that order and then pad them to a block size of 64 bytes before computing the digest. The
CryptoCompanion does not ever generate a SHA-1 digest of datasets larger than a single round.
1.1 General Operation
The CRF device contains secrets that must be known or derived by a Host system in order to establish a trusted link
between the two and permit communications to happen. The CryptoCompanion stores these secrets in an obscured way
in nonvolatile memory and contains all the circuitry necessary to perform the authentication, password, and
encryption/decryption functions specified in the CRF datasheet. In this manner, the secrets do not ever need to be
revealed.
The general cryptographic strategy is as follows:
Each CRF device has a serial or identification number (ID) and authentication secret Gi stored in EEPROM. ID is
freely readable; Gi can never be read and is unique for all tags.
The CryptoCompanion contains an EEPROM that contains a set of common secrets (Fn). The
AT88SC118 combines Fn with ID and KID to compute a value of G that is expected to match that in the CRF
device. Specifically, G = SHA-1(Fn, ID, KID).
G is further diversified by the inclusion of a number (KID) generated by the Host system in a manner of its
choosing. Typically, it will be the result of a cryptographic operation on the CRF ID value calculated using other
data, secrets, and/or algorithms external to the AT88SC118. This permits scenarios that offer varying degrees of
additional security.
The CryptoCompanion includes a general purpose cryptographic quality Random Number Generator which is
used to seed a mutual authentication process between the AT88SC118 and CRF. If the CRF confirms the
CryptoCompanion challenge, and the CryptoCompanion confirms the CRF response, then the Host system
proceeds with CRF operations. In this way, the Host system may use the CRF without knowing the CRF’s secrets
directly.
1.2 CryptoCompanion Benefits
The following is a partial list of the benefits of using this device versus storing the algorithms and secrets in standard
Flash system memory.
Keep confidential those core secrets that are used to authenticate with and communicate to/from CRF.
(Store them in EEPROM and use them on-chip)
Flexible system implementation — multiple secrets and policies for different CRF locations within the system.
Multiple manufacturer setup options.
Hardware encryption engines, avoids algorithm disclosure from reverse-compilation of system operating code.
Full hardware security implementation makes it harder for an attacker (even with lab equipment) to get secrets
stored on the CryptoCompanion.
Global secrets are protected using strong security, standard algorithm (SHA-1).
Implements a crunching algorithm to prevent micro-controller based CRF replicas.
Robust Random Number Generation avoids accidental replay for all cryptographic operations using the system;
not just with respect to CRF.
Secure EEPROM storage for configuration information, etc. may permit reduction in the total BOM for the system.
Easy to use — little programming required, no knowledge of security algorithms or protocols, and fast time to
market.
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Atmel AT88SC118 [SUMMARY DATASHEET]
Atmel-8858AS-CryptoComp-AT88SC118-Datasheet-Summary_042013
1.3 Package, Pinout, and I/O
1.3.1 Pinout
All pins not otherwise specified are considered Test pins and should be grounded on the board.
Table 1-1. Pin Descriptions
1.3.2 Package
The CryptoCompanion is packaged in an 8-lead SOIC package. The pinout is as follows:
Table 1-2. 8-lead SOIC package pinout
Note: Pins 3 and 7 are not internally connected and should be connected to ground on the PC board.
Pin Description
VCC and
GND
Power Supply and Ground. Power supply is 2.7 – 3.6V and the supply current is less than 5mA.
The CryptoCompanion will be available to accept commands 60ms after the later of VCC rising above 2.7V
or Reset being driven high if CryptoCompanion is in a security delay then this interval is significantly longer.
During power-up, VCC must exhibit a monotonic ramp at a minimum rate of 50mV/ms until VCC has crossed
the 2.7V level. During power-down, VCC must exhibit a monotonic ramp at a minimum rate of 50mV/ms once
it has dropped below the 2.5V boundary. CryptoCompanion does not support hot swapping or hot plugging.
VCC must be bypassed with high quality surface mount capacitors that are properly located on the board.
Atmel recommends two capacitors connected in parallel having a value of 1mF and 0.01mF. The capacitors
should be manufactured using X5R or X7R dielectric material. These capacitors should be connected to the
AT88SC118 using a total of no more than 1cm PC board traces. Atmel recommends the use of a ground
plane and a trace length of less than 0.5cm between the capacitors and the VCC pin.
Caution: Failure to follow these recommendations may result in improper operation.
SDA 2-Wire Interface Data pin and 5V compatible. Data setup time = 0.1μs minimum and data hold time = 0 μs
minimum.The system board must include an external pull-up resistor.
SCL 2-Wire Interface Clock pin and 5V compatible. Maximum SCL rate is 400KHz, min. TLOW = 1.2μs,
min. THIGH = 0.6μs. The system board must include an external pull-up resistor.
RST Reset. This active low input will reset all states within the AT88SC118. It is honored regardless of the state
of PowerDown.
PDN
PowerDown. When held low, the part operates normally. When held high the part will go to sleep and ignore
all transitions on SDA and SCL, power consumption will drop to less than 10μA. There is a 50ms delay
between this pin falling and the first transition on SDA or SCL that will be accepted by the device.
Pin Number Pin Name
1 PDN
2 RST
3 and 7 NC
4 GND
5 SDA
6 SCL
8 VCC
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Atmel AT88SC118 [Summary Datasheet]
Atmel-8858AS-CryptoComp-AT88SC118-Datasheet-Summary_042013
1.3.3 Connection Diagram
Figure 1-1. Connection Diagram
1.3.4 TWI Input/Output Operation
The CryptoCompanion communicates to the system using a 2-Wire Interface (TWI), which is similar to SMBus. The
device operates as a slave and does not support clock stretching. This 2-Wire protocol is identical to that supported by
the Atmel AT24C16B Serial EEPROM devices. Refer to the datasheet on the Atmel website for detailed timing and
protocol information.
The system processor is expected to properly format commands for the AT88SC118 (which may include information
from the CRF device), and then process the outputs of the AT88SC118 (which may include sending some of the outputs
to the CRF device).
The CryptoCompanion cannot directly communicate with CRF devices. Both CRF and the CryptoCompanion are slave
devices. The bus master may use one or two busses to communicate with them. Separate TWI addresses must be used
if both devices are on the same bus.
2.7V – 5.5V
2.7V – 3.6V
SDA
SCL
Microprocessor CryptoCompanion
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Atmel AT88SC118 [SUMMARY DATASHEET]
Atmel-8858AS-CryptoComp-AT88SC118-Datasheet-Summary_042013
1.4 Memory Locking
When this initialization is complete, the Lock command should be executed which limits access to the memory per the
restrictions listed later in this section. The system can determine the current lock value by using the
ReadManufacturingID command to read out the ManufacturingID value (MfrID) and the lock byte.
The table below describes the encoding of the least significant two bits of the Lock byte. On shipment from Atmel,
Lock[1:0] will have a value of either 10 or 00, depending on the part number ordered. An Atmel AT88SC118 in either of
these two states is considered unlocked. It is not possible to change from one of these unlocked states to the other.
After the Lock command has been executed, the Lock byte will have the value 0xFF. Subsequent changes to the Lock
byte are impossible.
Table 1-3. Memory Locking
LockBit
1
LockBit
0 (LSB) Meaning
1 1 Locked. ReadMemory and WriteMemory enabled, subject to the restrictions in this section.
WriteMemoryEncrypted and ReadMemoryDigest disabled.
1 0 Unlocked/Confidential. ReadMemoryDigest, WriteMemory, and WriteMemoryEncrypted enabled.
ReadMemory disabled.
0 0 Unlocked. ReadMemory and WriteMemory enabled. WriteMemoryEncrypted and
ReadMemoryDigest disabled.
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2. AC and DC Characteristics
Table 2-1. DC Characteristics(1)
Note: 1. Typical values at 25C. Maximum values are characterized values and not test limits in production.
Applicable over recommended operating range from VCC = +2.7 to 3.6 V, TAC = -40o C to 85o C (unless otherwise noted).
Symbol Parameter Test Condition Min Typ Max Units
VCC Supply Voltage 2.7 3.6 V
ICC Supply Current 400kHz 5 mA
ISB Standby Current VIN = VCC or GND 15 A
VIL SDA Input Low Voltage -0.3 VCC x 0.3 V
VIL CLK Input Low Voltage -0.3 VCC x 0.3 V
VIL RST Input Low Voltage -0.3 VCC x 0.3 V
VIL PDN Input Low Voltage -0.3 VCC x 0.3 V
VIH SDA Input High Voltage VCC x 0.7 5.25 V
VIH SCL Input High Voltage VCC x 0.7 5.25 V
VIH RST Input High Voltage VCC x 0.7 5.25 V
VIH PDN Input High Voltage VCC x 0.7 5.25 V
IIL SDA Input Low Current 0 < VIL < VCC x 0.15 -10 10 A
IIL SCL Input Low Current 0 < VIL < VCC x 0.15 -10 10 A
IIL RST Input Low Current 0 < VIL < VCC x 0.15 -10 10 A
IIL PDN Input Low Current 0 < VIL < VCC x 0.15 -10 10 A
IIH SDA Input High Current VCC x 0.7 < VIH < VCC -10 10 A
IIH SCL Input High Current VCC x 0.7 < VIH < VCC -10 10 A
IIH RST Input High Current VCC x 0.7 < VIH < VCC -10 10 A
IIH PDN Input High Current VCC x 0.7 < VIH < VCC -10 10 A
VOH SDA Output High Voltage 20k Ohm External Pull-up VCC x 0.8 V
VOL SDA Output Low Voltage IOL = 1mA, Vcc=2.7V 0.4 V
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Table 2-2. AC Characteristics(1)
Notes: 1. Typical values at 25C. Maximum values are characterized values and not test limits in production.
2. This parameter is not tested. Values are based on characterization and/or simulation data.
Figure 2-1. SCL: Serial Clock, SDA: Serial Data I/O
Applicable over recommended operating range from VCC = +2.7 to 3.6 V, TAC = -40o C to 85o C,
CL = 30pF (unless otherwise noted).
Symbol Parameter Min Max Units
fCLK Clock Frequency 0 400 kHz
Clock Duty Cycle(2) 40 60 %
tRRise Time: SDA, RST, PDN(2) 300 nS
tFFall Time: SDA, RST, PDN(2) 300 nS
tRRise Time: SCL(2) 300 nS
tFFall Time: SCL(2) 300 nS
tAA Clock Low to Data Out Valid 900 nS
tHD.STA Start Hold Time 600 nS
tSU.STA Start Set-up Time 600 nS
tHD.DAT Data In Hold Time 100 nS
tSU.DAT Data In Set-up Time 100 nS
tSU.STO Stop Set-up Time 600 nS
tDH Data Out Hold Time 50 900 nS
SCL
SDA In
SDA Out
tF
tHIGH
tLOW tLOW
tR
tAA tDH tBUF
tSU.STO
tSU.DAT
tHD.DAT
tHD.STA
tSU.STA
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Atmel AT88SC118 [Summary Datasheet]
Atmel-8858AS-CryptoComp-AT88SC118-Datasheet-Summary_042013
3. Ordering Codes
Ordering Code Memory Locking Package Voltage Range Temperature Range
AT88SC118-SH-CM Bulk 00
(Unlocked)
8S1 2.7V – 3.6V
Green Compliant
(exceeds RoHS)
Industrial
(-40C to 85C)
AT88SC118-SH-CM-T Tape and Reel
AT88SC118-SH-CN Bulk 10
(Unlocked/Confidential)
AT88SC118-SH-CN-T Tape and Reel
Package Description
8S1 8-lead, 0.150" Wide, Plastic Gull Wing Small Outline (JEDEC SOIC)
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Atmel AT88SC118 [SUMMARY DATASHEET]
Atmel-8858AS-CryptoComp-AT88SC118-Datasheet-Summary_042013
4. Package Drawing
4.1 8S1 — 8-lead JEDEC SOIC
DRAWING NO. REV. TITLE GPC
COMMON DIMENSIONS
(Unit of Measure = mm)
SYMBOL MIN NOM MAX NOTE
A1 0.10 0.25
A 1.35 – 1.75
b 0.31 – 0.51
C 0.17 0.25
D 4.80 5.05
E1 3.81 3.99
E 5.79 – 6.20
e 1.27 BSC
L 0.40 – 1.27
Ø
Ø
Ø
E
1
N
TOP VIEW
C
E1
END VIEW
A
b
L
A1
e
D
SIDE VIEW
Package Drawing Contact:
packagedrawings@atmel.com
8S1 G
6/22/11
Notes: This drawing is for general information only.
Refer to JEDEC Drawing MS-012, Variation AA
for proper dimensions, tolerances, datums, etc.
8S1, 8-lead (0.150” Wide Body), Plastic Gull Wing
Small Outline (JEDEC SOIC) SWB
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Atmel AT88SC118 [Summary Datasheet]
Atmel-8858AS-CryptoComp-AT88SC118-Datasheet-Summary_042013
5. Revision History
Doc. Rev. Date Comments
8858AS 04/2013 Initial summary document release.
X
XXX
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