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ATSHA204A Datasheet(PDF) 38 Page - Microchip Technology

Part # ATSHA204A
Description  ATSHA204A Microchip CryptoAuthentication Data Sheet
PDF  93 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

ATSHA204A Datasheet(HTML) 38 Page - Microchip Technology

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Parameter
Symbol
Direction
Min Typ Max Unit Notes
To Crypto
Authentication
93
μs
After the ATSHA204A
transmits the last bit of a
block, the system must wait
this interval before sending
the first bit of a flag.
I/O Timeout
tTIMEOUT
To Crypto
Authentication
45
65
85
ms
The ATSHA204A may
transition to the sleep state if
the bus is inactive longer
than this duration. See
Section I/O Timeout for
specific details.
Note: 
1.
tSTART, tZLO, tZHI and tBIT are designed to be compatible with a standard UART running at 230.4
kBaud for both transmit and receive. The UART should be set to seven data bits, no parity and one
stop bit.
7.3.2
AC Parameters — I2C Interface
Figure 7-3. I2C Synchronous Data Timing
SCL
SDA IN
SDA OUT
t
F
t
HIGH
t
LOW
t
LOW
t
R
t
AA
t
DH
t
BUF
t
SU.STO
t
SU.DAT
t
HD.DAT
t
HD.STA
t
SU.STA
Table 7-4. AC Characteristics of the I2C Interface
Unless otherwise specified, applicable over recommended operating range from TA = −40°C to + 85°C,
VCC = +2.0V to +5.5V, CL = 1 TTL gate and 100 pF.
Symbol
Parameter
Min
Max
Units
fSCK
SCK Clock Frequency
1000
kHz
SCK Clock Duty Cycle
30
70
%
tHIGH
SCK High Time
400
ns
tLOW
SCK Low Time
400
ns
tSU.STA
Start Setup Time
250
ns
tHD.STA
Start Hold Time
250
ns
tSU.STO
Stop Setup Time
250
ns
ATSHA204A
Electrical Characteristics
© 2018 Microchip Technology Inc.
DS40002025A-page 38



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