STOD13AM

Detailed description

Doc ID 023747 Rev 1

13/25

6

Detailed description

6.1

SWIRE

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Protocol: to digitally communicate over a single cable with single-wire components

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3 components of the single-wire:

1.

an external MCU

2.

wiring and associated connectors

3.

the STOD13AM device with a dedicated single-wire pin.

6.1.1

SWIRE features and benefits

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Fully digital signal

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No handshake needed

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Protection against glitches and spikes though an internal low pass filter acting on falling

edges

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Uses a single wire (plus analog ground) to accomplish both communication and power

control transmission

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Simplifies design with an interface protocol that supplies control and signaling over a

single-wire connection to set the output voltages.

6.1.2

SWIRE protocol

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Single-wire protocol uses conventional CMOS/TTL logic levels (maximum 0.6 V for

logic “zero” and a minimum 1.2 V for logic “one”) with operation specified over a supply

voltage range of 2.5 V to 4.5 V

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Both master (MCU) and slave (STOD13AM) are configured to permit bit sequential

data to flow only in one direction at a time; master initiates and controls the device

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Data is bit-sequential with a START bit and a STOP bit

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Signal is transferred in real-time

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System clock is not required; each single-wire pulse is self-clocked by the oscillator

integrated in the master and is asserted valid within a frequency range of 250 kHz

(maximum).

6.1.3

SWIRE basic operations

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The negative output voltage levels are selectable within a wide range (steps of 100 mV)

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