ASI4U datasheet(15/71 Pages) RENESAS

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ASI4U / ASI4U-E / ASI4U-F Datasheet

January 26, 2016

Figure 3.2

Conventional Application for AS-i IC

with One External Coil

Figure 3.3

Application for AS-i IC with Two

External Coils

3.3.2.

IRD Communication Channel

In addition to the AS-Interface communication channel, the ASI4U can also operate on a second input channel:

the IRD Input Channel or Addressing Channel. In this mode, the IRD pin is the input for an AS-i signal in

Manchester-II-coded format. The signal can be either an AC-current signal generated by a photodiode or a 5V-

CMOS signal. The IC automatically detects the type of the signal and switches the input path accordingly.

The output pin in IRD Communication Mode is LED1. It transmits the slave response as an inverted Manchester-

II-coded AS-i signal. A red LED connected to LED1 can form the response transmitter in an optical

communication system, or LED1 can be directly connected to external circuitry.

Activation of the IRD communication channel is achieved by a transmission referred to as a “Magic Sequence”

that is sent in advance of the desired communication. The construction of a Magic Sequence is described in detail

in section 4.3. The IRD communication mode is deactivated by an IC reset, except in a special case described in

section 4.3.

3.3.3.

Parameter Port Pins

The ASI4U features a 4-bit-wide parameter port and a related parameter strobe signal on the PST pin. There is a

defined phase relation between a parameter output event, the parameter input sampling, and the activation of the

PST signal, so it can be used to trigger external logic or a microcontroller to process the received parameter data

or to provide new input data for the AS-i slave response.

Version 3.0 of the AS-Interface Complete Specification defines a bidirectional mode for parameter data. The

ASI4U/ASI4U-E/ASI4U-F supports this feature, which can be activated by special EEPROM setting.

See section 4.6 for further details.

ASI+

ASI-

Load

AS-i

Slave

GND

ASI+

ASI-

Load

AS-i

Slave

GND

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