ASI4U datasheet(11/71 Pages) RENESAS

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ASI4U / ASI4U-E / ASI4U-F Datasheet

January 26, 2016

Basic Functional Description

3.1. Functional Block Diagram

Figure 3.1

ASI4U Functional Block Diagram

TRANSMIT

DIGITAL

LOGIC

ASI4U/ASI4U-E/ASI4U-F

AGND

LGND

DI(3:0)

DSR

PST

P(3:0)

UIN

UOUT

U5R

OSC1

CAP

ASIP

ASIN

OVER- HEAT

P - PULSE

N - PULSE

REC- RESET

SEND-D

SEND- SBY

INPUT

STAGE

I/O

STAGE

OUTPUT

STAGE

INPUT

STAGE

CMOS

INPUT

STAGE

CURRENT

INPUT

DATA- STRB

RESET

PARAM

STRB

ELECTRONIC

INDUCTOR

IRD_IN

ANA

DIG

OVER- LOAD

FID

LED2

LED1

IRD

GND

INPUT

STAGE

OUTPUT

STAGE

OSC2

OUTPUT

STAGE

OUTPUT

STAGE

DO(3:0)

RECEIVE

OSCILLATOR

POWER

SUPPLY

THERMAL /

OVERLOAD

PROTECTION

Following device functions are associated with the different blocks of the IC:

RECEIVE

The RECEIVE block converts the analog telegram waveform from the AS-i bus to a digital pulse-

coded signal that can be processed further by a digital UART circuit.

The RECEIVE block is directly connected to the ASIP and ASIN pins, which connect to the AS-i

line. It converts the differential AS-i telegram to a single-ended signal and removes the DC offset

by high-pass filtering. To adapt quickly to changing signal amplitudes in telegrams from different

network users, the amplitude of the first telegram pulse is measured by a 3-bit flash ADC and the

threshold of a positive and a negative comparator is set accordingly to about 50% of the mea-

sured level. The comparators generate the P-pulse and N-pulse signals.

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