SAP5SD-A-G1-T Datasheet, PDF (47/63 Pages) List of Unclassifed Manufacturers – Universal Actuator-Sensor Interface IC

SAP5S / SAP51
Universal Actuator-Sensor Interface IC
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 Inhibit_Watchdog P0_Watchdog_Activation Safety_Mode Parameter Port
E²PROM flag E²PROM flag
E²PROM flag
_Enable
P0 output reg
0
X
X
X
X
1
1
1
0
1
0
1
0
1
0
X
X
X
0
X
X
1
1
X
1
0
0
1
0
1
Watchdog
Activation
OFF
OFF
ON
ON
OFF
ON
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.
In order to resume to normal Data Port communication after a Watchdog IC 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.
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.
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