SAP51D-A-G1-R datasheet(16/67 Pages) RENESAS

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SAP51 / SAP5S Datasheet

January 28, 2016

The new definition introduces a multiplexed data transfer so that all 4-bits of the data output port can be used

again. A first AS-i cycle transfers the data for a 2-bit output nibble only, and then the second AS-i cycle transfers

the data for the complementary 2-bit nibble. Nibble selection is done by the remaining third bit. To ensure

continuous alternation of information bit I2 and thus continued data transfer of both nibbles, a special watchdog

has been implemented that observes the state of the I2 bit. The watchdog can be activated or deactivated by

EEPROM setting. It provides a watchdog filter time of about 327ms.

The multiplexed transfer increases the refresh time per output by a factor of two; however, some applications can

tolerate this increase and gain the advantage of less external circuitry and better slave address efficiency. The

sampling cycle of the data inputs remains unchanged since the meaning of bit I3 has not been changed in the

slave response with the definition of the Extended Address Mode.

More detailed information is given in section 5.8.4.

3.2.9.

AS-i Safety Mode

Using the SAP5 Safety Mode makes it easy to implement a safety-related AS-i slave according to the AS-i Safety

at Work concept. Slaves complying with the control category 4 according to EN 954 –1 can be implemented even

with a minimum of external circuitry.

In Safety Mode, the response of the SAP5 on a Data_Exchange master call (DEXG) is different. Instead of

responding with the regular input data provided at the data ports, a 4-bit data word from a specific 8

∗4 bit code

table is transmitted to the master. Cycling the code table is used to transmit another data word with each DEXG

master call. The data transmission is supervised by a safety monitor.

In Safety Mode, the use of the enhanced data input features described in sections 3.2.5 to 3.2.8 are disabled. In

this case, the Safety Mode related inputs act as 3-level inputs. See section 5.18 for further details.

3.2.10. Enhanced LED Status Indication

The SAP5 supports status indication by two LED outputs. More detailed information on the signaling scheme can

be found in section 5.11.

3.2.11. Communication Monitor/Watchdog

Data and parameter communication is continuously observed by a communication monitor. If neither

Data_Exchange nor Write_Parameter calls have been addressed to and received by the SAP5 within a time

frame of approximately 41ms, the No Data/Parameter Exchange status is detected and signaled at LED1.

If the respective flags are set in the EEPROM, the communication monitor can also act as a communication

watchdog that initiates a complete SAP5 reset after the expiration of the watchdog timer. The watchdog mode can

also be activated and deactivated by a signal at parameter port pin P0. For additional detailed information, see

section 5.17.

3.2.12. Write Protection of ID_Code_Extension_1

As defined in AS-Interface Complete Specification V3.0 the SAP5 also supports write protection for

ID_Code_Extension_1. The feature allows the activation of new manufacturer-protected slave profiles and is

enabled by EEPROM setting. It is described in more detail in section 5.20.

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