SAP5SD-A-G1-R datasheet(53/62 Pages) ZMD

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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.

53 of 62

4.19.3. Functional Description

In Master/Repeater Mode the SAP5 provides a simple physical-layer interface function between the AS-I line

and an external binary channel.

The signal RX_DAT represents the Manchester-II-coded, re-synchronized equivalent of the telegram signal

received at the AS-i input channel. Polarity of that bitstream depends on the programmed operation mode

according to Table 37.

Table 37: Functional Distinctions of SAP5 Master- and Repeater Mode

Modulation of signal

RX_DAT in case of ASI

Power Fail

Loopback Mode

Polarity of signal RX_DAT

Master Mode 1

active HIGH

Master Mode 2

OFF

active HIGH

Repeater Mode

OFF

active LOW

Every received AS-i telegram is checked for consistency with the protocol specifications and timing jitters

become removed as long as they stay within the specified limits. In case a telegram error is detected, the

output signal becomes inactive for a time period defined by tBREAK (refer to Table 39).

The signal TX_DAT is directly forwarded to the AS-i line transmitter avoiding any additional logic delays.

In case the Loopback Mode is not active, the AS-i receiver gets disabled as long as the SAP5 is transmitting

an AS-i signal. Otherwise, the transmitted signal is read back in parallel and provided at the RX_DAT output

for checkup purposes.

The Loopback time tLOOPBACK is mainly defined by the analog signal processing within the Receiver and the

Transmitter. However, an additional delay of up to 1875ns may be inserted if necessary. Therefore, the

ID_Code_Extension_2 EEPROM register has to be programmed as described below.

NOTE: The ID_Code_Extension_2 has to be programmed before programming of the Master_Mode flag.

Once the Master_Mode flag is set to logic HIGH, the slave functionality of the SAP5 is no longer available,

preventing any write access to the E²PROM by use of AS-i master requests as described on page 25.

Table 38: Programmable Variation of the Loopback time

ID_Code_Extension_2

(ID2_Bit3 … ID2_Bit0)

t

loopback

Unit

0000

0001

+125

0010

+250

0011

+375

0100

+500

0101

+625

0110

+750

0111

+875

1000

+1000

1001

+1125

1010

+1250

1011

+1375

1100

+1500

1101

+1625

1110

+1750

1111

+1875

SAP5SD-A-G1-R 数据表(PDF) 53 Page - Zentrum Mikroelektronik Dresden AG

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