ATSHA204 ATMEL [ATMEL Corporation], ATSHA204 Datasheet - Page 28

• Manufacturer Part Number: ATSHA204
• Description: Atmel CryptoAuthentication
• Manufacturer: ATMEL [ATMEL Corporation]

7.3.1
AC Parameters – Single-wire Interface
Figure 7-2. AC Timing Diagram – Single-wire Interface
LOGIC Ø
LOGIC 1
Table 7-3.
Applicable from TA = −40°C to +85°C, V
Note:
Parameter
Start Pulse
Duration
Zero
Transmission
High Pulse
Zero
Transmission
Low Pulse
Bit Time
Turnaround
Delay
I/O Timeout
1.
(1)
AC Parameters – Single-wire Interface
t
transmit and receive. The UART should be set to seven data bits, no parity, and one stop bit.
START
Symbol
t
t
t
t
t
t
START
ZHI
ZLO
BIT
TURNAROUND
TIMEOUT
, t
ZLO
, t
t
t
ZHI
START
START
, and t
Direction
To Crypto
Authentication
From Crypto
Authentication
To Crypto
Authentication
From Crypto
Authentication
To Crypto
Authentication
From Crypto
Authentication
To Crypto
Authentication
From Crypto
Authentication
From Crypto
Authentication
To Crypto
Authentication
To Crypto
Authentication
BIT
t
ZHI
are designed to be compatible with a standard UART running at 230.4K baud for both
CC
= +2.0V to +5.5V, CL =100pF (unless otherwise noted)
t
t
ZLO
BIT
Min
4.1
4.6
4.1
4.6
4.1
4.6
37
41
28
15
45
4.34
4.34
4.34
Typ
6.0
6.0
6.0
39
54
60
65
4.56
4.56
4.56
Max
8.6
8.6
8.6
78
95
85
-
Unit
ms
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
If the bit time exceeds t
Atmel ATSHA204 may enter the sleep state.
See Section 5.3.1 for specific details.
The Atmel ATSHA204 will initiate the first
low-going transition after this time interval
following the end of the last bit (t
Transmit flag.
After the Atmel ATSHA204 transmits the last
bit of a block, the system must wait this
interval before sending the first bit of a flag.
The Atmel ATSHA204 may transition to the
sleep state if the bus is inactive longer than
this duration. See Section 5.3.1 for specific
details.
Atmel ATSHA204 [DATASHEET]
Notes
8740D−CRYPTO−3/12
TIMEOUT
, then the
BIT
) of the
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