SAP5SD-A-G1-R datasheet(47/63 Pages) ETC2

47 / 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.

47 of 62

Note: The value of the Parameter Port P0 Input does not influence the watchdog activation at all. Only the

master can change the activation status by sending a corresponding Write_Parameter (WPAR) request. This

allows using the feature even if IO-Code 7 is selected. In this case, the parameter port pins are mapped into

Data Input pins. But since the activation of the Communication Watchdog only depends on the value of the

parameter output register, the watchdog functionality still remains controlled by the master.

Watchdog activation through the value of Parameter Port P0 is not available in Safety Mode.

Table 33: Activation of the SAP5 Communication Watchdog

Lock_EE_PRG

E²PROM flag

Inhibit_Watchdog

E²PROM flag

P0_Watchdog_Activation

E²PROM flag

Safety_Mode

_Enable

Parameter Port

P0 output reg

Watchdog

Activation

OFF

The Communication Watchdog recognizes a No Data Exchange status as soon as the following conditions

come true together:



The Communication Watchdog is activated.



No DEXG or WPAR request was processed for more than 94.2ms (+4ms).



Slave address is unequal to zero (0).



No E²PROM write access is active.

If the Communication Watchdog detects a No Data Exchange status, it takes the following actions:



It concurrently generates Data and Parameter Strobe signals at the DSTBn an PSTBn pins with timing

according to Figure 6 and Figure 7. NOTE: At this time, the data and parameter output values still

comply with the values received with the last DEXG and WPAR master call, respectively.



After DSTBn an PSTBn strobe generation finished, the Communication Watchdog invokes an

unconditioned IC Reset. It sets the Data_Exchange_Disable flag and - afterwards - starts the IC

initialization procedure, switching all Data and Parameter Outputs inactive.

order

resume

normal

Data

Port

communication

after

Watchdog

Reset,

the

Data_Exchange_Disable flag must be cleared again. Therefore, the master has to send a WPAR request

again before Data Port communication can be reestablished. This ensures new parameter setup of possibly

connected external circuitry.

The state until the Data_Exchange_Disable flag returns to ‘0’ is signaled by a certain LED1 and LED2 status

indication (refer to 4.11).

4.18. 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.

The Safety Mode is active as soon as the E²PROM flag Safety_Mode_Enable is set to ‘1’ (logic HIGH). Thus,

it is basically independent on the slave profile, whereas the assignment of the 3-level-input pins mentioned

below to either the Data- or the Parameter port depends on the IO_Code as described in Table 26 on page

40.

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