AT86RF401 datasheet(5/52 Pages) ATMEL

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AT86RF401

1424F–RKE–12/03

RESETB

SPI Reset Input: A “low” on this pin resets the device and puts

the part into SPI mode. A logic-high on this pin causes the

device to execute its program if the VDD is above the brown-

out voltage level.

No Connect. Float Pin.

I/O0 (SDI)

SPI Data In/Input/Output 0: General-purpose I/O and button

input. In SPI mode, this pin serves as SDI (Serial Data Input).

I/O1 (SDO)

SPI Data Out/Input/Output 1: General-purpose I/O and button

input. In SPI mode, this pin serves as SDO (Serial Data

Output).

I/O2 (SCK)

SPI Clock/Input/Output 2: General-purpose I/O and button

input. In SPI mode, this pin serves as SCK (SPI Clock Input).

XTAL/CLK

Crystal/Clock Input: Input to the inverting oscillator amplifier

and input to the internal clock operating circuit. This pin may

be driven externally for test purposes.

Table 2. Pin Descriptions – 20-lead TSSOP (Continued)

35 k

Ω

To AVR

Data

nable

−

Data

Enable

35 k

Ω

To AVR

Data

Enable

−

Data

Enable

35 k

Ω

To AVR

Data

Enable

−

Data

Enable

35 k

Ω

To AVR

40 pF

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