Datasheet

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Parameter Symbol Direction Min. Typ. Max. Unit Conditions
Turn Around
Delay
t
TURNAROUND
From Crypto
Authentication
64 96 131 µs ATECC608A will initiate the first
low going transition after this time
interval following the initial falling
edge of the start pulse of the last
bit of the transmit flag.
To Crypto
Authentication
93 — — µs After ATECC608A transmits the
last bit of a group, system must
wait this interval before sending the
first bit of a flag. It is measured
from the falling edge of the start
pulse of the last bit transmitted by
ATECC608A.
IO Timeout t
TIMEOUT
To Crypto
Authentication
45 65 85 ms ATECC608A may transition to the
Sleep mode if the bus is inactive
longer than this duration.
Note: START, ZLO, ZHI, and BIT 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.
2.3.2 AC Parameters: I
2
C Interface
Figure 2-3. I
2
C 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 2-4. AC Characteristics of I2C Interface
Unless otherwise specified, applicable over recommended operating range from T
A
= -40°C to + 85°C, V
CC
= +2.0V
to +5.5V, C
L
= 1 TTL Gate and 100 pF
Parameter
Symbol Min. Max. Units
SCK Clock Frequency f
SCK
0 1 MHz
SCK High Time t
HIGH
400 — ns
SCK Low Time t
LOW
400 — ns
Start Setup Time t
SU.STA
250 — ns
Start Hold Time t
HD.STA
250 — ns
ATECC608A
Electrical Characteristics
© 2018 Microchip Technology Inc.
Datasheet Summary
DS40001977B-page 9