ATECC508A datasheet(53/109 Pages) MICROCHIP

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8.4

DC Parameters: All I/O Interfaces

Table 8-5. DC Parameters on All I/O Interfaces

Parameter

Symbol Min Typ Max Unit Conditions

Ambient Operating

Temperature

-40

—

°C

Power Supply Voltage

VCC

2.0

—

5.5

Active Power Supply

Current

ICC

—

Waiting for I/O during I/O transfers or execution of

non-ECC commands.

—

During ECC command execution.

Idle Power Supply Current

IIDLE

— 800

—

µA

When device is in idle mode,

VSDA and VSCL < 0.4V or > VCC – 0.4

Sleep Current

ISLEEP —

150

When device is in sleep mode, VCC ≤ 3.6V,

VSDA and VSCL < 0.4V or > VCC – 0.4, TA ≤

+55°C

—

µA

When device is in sleep mode.

Output Low Voltage

VOL

—

0.4

When device is in active mode,

VCC = 2.5 – 5.5V

Output Low Current

IOL

—

When device is in active mode,

VCC = 2.5 – 5.5V, VOL = 0.4V

Theta JA

ƟJA

— 166

—

°C/W SOIC (SSH)

— 173

—

°C/W UDFN (MAH)

— 146

—

°C/W RBH

8.4.1

VIH and VIL Specifications

The input levels of the device will vary dependent on the mode and voltage of the device. The input

voltage thresholds when in sleep or idle mode are dependent on the VCC level as shown in Figure 8-4.

When in sleep or idle mode the TTLenable bit has no effect.

When the device is active (i.e. not in sleep or idle mode), the input voltage thresholds are different

depending upon the state of TTLenable (bit 1) within the ChipMode byte in the Configuration zone of the

EEPROM. If the voltage supplied to the VCC pin of the ATECC508A is different than the system voltage to

which the input pull-up resistor is connected, then the system designer may choose to set TTLenable to

zero, which enables a fixed input threshold shown by curves VIL_ACT and VIH_ACT in Figure 8-4. Table

8-6 which applies only when the device is active, presents the guaranteed levels of operation when

operating in this mode.

Table 8-6. VIL, VIH on All I/O Interfaces (TTLenable = 0)

Parameter

Symbol Min Typ

Max

Unit Conditions

Input Low Voltage

VIL

-0.5

0.5

When device is active and TTLenable bit in configuration

memory is zero; otherwise see above.

Input High Voltage

VIH

1.5

VCC + 0.5

When device is active and TTLenable bit in configuration

memory is zero; otherwise see above.

ATECC508A

Electrical Characteristics

Datasheet Complete

DS20005927A-page 53

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