STOD14

Detailed description

Doc ID 023562 Rev 1

15/22

stages of the device are turned off. This status is maintained avoiding current flowing to the

load. A new enable transition is needed to restart the device. The short-circuit protection is

active during startup.

7.11

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

Features and benefits

●

Fully digital signal

●

No handshake needed

●

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

rising and falling edges

●

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

control transmission

●

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

single-wire connection to set the output voltages.

●

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

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

supply voltage range of 2.5 V to 4.5 V

●

Both master (MCU) and slave (this device) are configured to permit bit sequential data

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

●

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

●

Signal is transferred in real time

●

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

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

(maximum).

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

7.12

functionality for all combinations.

Table 8.

EN

Action

Low

Low

Device off

Low

High

High

Low

Default negative output voltage

High

High

Default negative output voltage