ATECC508A datasheet(50/109 Pages) MICROCHIP

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Table 8-2. AC Parameters: All I/O Interfaces

Parameter

(Note)

Symbol

Direction

Min

Typ Max Unit Conditions

Power-Up Delay

tPU

To Crypto

Authentication

100

—

µs

Minimum time between VCC >

VCC min prior to measurement

of tWLO.

Wake Low

Duration

tWLO

To Crypto

Authentication

—

µs

Wake High Delay

to Data Comm.

tWHI

To Crypto

Authentication

1500

µs

SDA should be stable high for

this entire duration.

High Side Glitch

Filter at Active

tHIGNORE_A To Crypto

Authentication

45(Note)

Pulses shorter than this in

width will be ignored by the

device, regardless of its state

when active.

Low Side Glitch

Filter at Active

tLIGNORE_A To Crypto

Authentication

45(Note)

Pulses shorter than this in

width will be ignored by the

device, regardless of its state

when active.

Low Side Glitch

Filter at Sleep

tLIGNORE_S To Crypto

Authentication

15(Note)

µs

Pulses shorter than this in

width will be ignored by the

device when in sleep mode.

Watchdog

Timeout

tWATCHDOG To Crypto

Authentication

0.7

1.3

1.7

Maximum time from wake until

device is forced into sleep

mode. See Section Watchdog

Failsafe.

Note: These parameters are guaranteed through characterization, but not tested.

8.3.1

AC Parameters: Single-Wire Interface

Figure 8-2. AC Timing Diagram: Single-Wire Interface

START

ZHI

ZLO

Logic Ø

START

BIT

Logic 1

START

TURNAROUND

START

SDA

Table 8-3. AC Parameters: Single-Wire Interface

Unless otherwise specified, applicable from TA = -40°C to +85°C, VCC = +2.0V to +5.5V, CL =100 pF.

ATECC508A

Electrical Characteristics

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