SAP5SD-B-G1-R datasheet(16/63 Pages) ETC2

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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.

16 of 62

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

Master Mode Flag

Slave Mode

Master/Repeater Mode

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

More detailed signal descriptions can be found in chapters 4.19 Master- and Repeater Mode as well as 4.14

UART.

Figure 4: Data path in Master-, Repeater- and Monitor-Mode

ASI- Receiver

ASI- Transmitter

CMOS Input

LED Output

UART

ASI+

ASI-

(TX)

LED1

(RX)

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).

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