ATSHA204A datasheet(26/93 Pages) MICROCHIP

26 / 93 page

CRC-16 0x33

CRC-16 0x43

Command 0x77

Count

Host

1 1 1 0 1 1 1 0

Device

1 1 0 0 1 1 0 0 1 1 0 0 0 0 1 0

Opcode

Param1

Param2

Host

Device

Data (0 – N)

Transmit 0x88

Count

Data (1 – N)

Host

0 0 0 1 0 0 0 1

Device

X X X X X X X X X X X X X X X X

CRC-16

Idle

Host

1 1 0 1 1 1 0 1

Device X X X X X X X X X X X X X X X X

5.6

Wiring Configuration for Single-Wire Interface

The Single-Wire Interface allows the connection of the ATSHA204A to a Host using only a single SDA pin

to transfer data in both directions. This interface does not use the SCL pin. The ATSHA204A does not

require a bypass capacitor when wired in this configuration if the impedance of the power and ground

signals back to the power supply is low. Microchip recommends a bypass capacitor always be used for

the best reliability.

To prevent forward biasing the internal diode and drawing current across power planes in the system, the

resistor pull-up on the SDA pin should either be connected to the same supply that is connected to the

VCC pin or to a lower voltage rail.

If the signal levels for SDA are different from the VCC voltage, consult the parametric specifications

section of this document to ensure that the signal levels are such that excessive leakage current is

minimized when in sleep modes. This situation might occur if the ATSHA204A device is physically distant

from the bus master device, or the supply voltage for the bus master is different from the supply voltage

for the ATSHA204A.

ATSHA204A

Single-Wire Interface

DS40002025A-page 26

ATSHA204A Datasheet(PDF) 26 Page - Microchip Technology

ATSHA204A Datasheet(HTML) 26 Page - Microchip Technology

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