SAP5SD-B-G1-R datasheet(14/63 Pages) ETC2

14 / 63 page

SAP5S / SAP51

Universal Actuator-Sensor Interface IC

Data Sheet

July 17, 2012

the prior written consent of the copyright owner. The information furnished in this publication is PRELIMINARY and subject to

changes without notice.

14 of 62

Basic Functional Description

2.1. Functional Block Diagram

neg

Transmitter

Main

State

Machine

Electronic

Inductor

Power

Supply

pos

Receiver

MAN

UART

LTGP

LTGN

CDC

U5R

P3 ... P0

D3 ... D0

Output

LED2, LED1

I / O

DSTBn

Output

PSTBn

Input

PFAULT

DSTB

LED

PSTB

PFAULT

EEPROM

OSC1

OSC2

clk

OSCILLATOR

PLL

Offset

I / O

Offset

I / O

Param

Data

UOUT

Thermal

Protection

APF

Power

Fail Detector

Figure 3: Functional Block Diagram

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

RECEIVER

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 AS-i line pins LTGP and LTGN. It

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

by high pass filtering. To adapt quickly on 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 measured level. The comparators generate the P-Pulse and N-Pulse

signals.

TRANSMITTER

The transmit block transforms a digital response signal to a correctly shaped send current

signal which is applied to the AS-i bus. Due to the inductive network behavior of the

network the changing send current induces voltage pulses on the network line that overlay

the DC operating voltage. The voltage pulses shall have sin²-wave shapes. Hence, the

send current shape must follow the integral of the sin²-wave function.

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