SAP5SD-A-G1-T Datasheet, PDF (16/63 Pages) List of Unclassifed Manufacturers – Universal Actuator-Sensor Interface IC

SAP5S / SAP51
Universal Actuator-Sensor Interface IC
2.2. General Operational Modes
The SAP5 provides two operational modes: Slave Mode and Master/Repeater Mode. A definition of which
operational mode becomes active is made by programming the flag Master_Mode in the Firmware Area of the
E²PROM (see also Table 9 on page 24). The E²PROM is read out at every initialization of the IC. Online mode
switching is not provided. The following configurations apply:
Table 5: Assignment of operational modes
Selected Operational Mode
Slave Mode
Master/Repeater Mode
Master Mode Flag
0
1
In Slave Mode the SAP5 operates as fully featured AS-i Slave IC according to AS-i Complete Specification
v3.0.
In Master/Repeater Mode the SAP5 it acts as physical layer transceiver. It translates a digital output signal
from the master control logic (etc. PLC, µP, …) to a correctly shaped, analog AS-i pulse sequence and vice
versa. Every AS-i telegram received is checked for consistency with the AS-i communication protocol
specifications and if no errors were found, an appropriate receive strobe signal is generated.
The following figure shows the different data path configurations.
Master Mode
Slave Mode, ASI-Channel
ASI+
ASI- Receiver
ASI-
UART
CMOS Input
D0
(TX)
ASI- Transmitter
LED Output
LED1
(RX)
Figure 4: Data path in Master-, Repeater- and Monitor-Mode
More detailed signal descriptions can be found in chapters 4.19 Master- and Repeater Mode as well as 4.14
UART.
2.3. Slave Mode
The Slave Mode is the most complex operational mode of the IC. The SAP5 does not only support all
mandatory AS-i Slave functions but also a variety of additional features that eases the design of AS-i Slave
modules.
2.3.1. AS-i communication channel
The AS-i channel is directly connected to AS-i Bus via the pins LTGP and LTGN. A receiver and a transmitter
unit are connected in parallel to the pins that allow fully bi-directional communication through LTGP and
LTGN.
2.3.2. Parameter Port Pins
In the 20-pin package the SAP5 features a 4-bit wide parameter port and a related parameter strobe signal pin
PSTBn. AS-i Complete Specification V3.0 newly defines a bidirectional mode for parameter data. The SAP5
supports this feature that can be activated by special E²PROM setting (IO_Code, see chapter 4.9).
Data Sheet
July 17, 2012
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 3.1
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is PRELIMINARY and subject to
changes without notice.
16 of 62