ASI4UC-G1-SR-7 ZMDI, ASI4UC-G1-SR-7 Datasheet - Page 53

• Manufacturer Part Number: ASI4UC-G1-SR-7
• Description: Interface - Specialized ASI
• Manufacturer: ZMDI

Specifications of ASI4UC-G1-SR-7

• Product Category: Interface - Specialized
• Rohs: yes
• Product Type: Actuator Sensor Interface IC
• Operating Supply Voltage: 16 V to 33.1 V
• Supply Current: 6 mA
• Maximum Power Dissipation: 850 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SSOP-28
• Minimum Operating Temperature: - 25 C

3.13. Main State Machine
The State Machine controls the overall behavior of the IC. Depending on the configuration data stored in the
E²PROM, the State Machine activates one of the different IC operational modes and controls the digital I/O
ports accordingly. In Slave Mode it processes the received master telegrams and computes the contents of
the slave answer, if required. Table 6 on page 21 lists all master calls that are decoded by the ASI4U in Slave
Mode.
To prevent the critical situation in which the IC gets locked in a not allowed state (i.e. by imission of strong
electromagnetic radiation) and thereby could jeopardize the entire system, all prohibited states of the state
machine will lead to an unconditioned logic reset which is comparable to the AS-i call ”Reset Slave (RES)”.
3.14. Communication Monitor/Watchdog
The IC contains an independent Communication Monitor that observes the processing of Data_Exchange and
Write_Parameter requests. If no such requests have been processed for more than 40.960ms (+5%) the
Communication Monitor recognizes a No Data/Parameter Exchange status and turns the red status LED
(LED1) on. Any following Data_Exchange or Write_Parameter request will let the Communication Monitor start
over and turn the red status LED off.
The Communication Monitor is only activated at slave addresses unequal to zero (0) and while the IC is
processing the first Write_Parameter request after initialization. It becomes deactivated at any IC Reset or
after the reception of a Delete_Address Request.
If the Watchdog_Active flag (E²PROM Firmware Area) is set or the P0_Watchdog_Activation flag is set and
Parameter Port P0 is logic high, the Communication Monitor is switched to the so-called Watchdog Mode.
If the Communication Monitor detects a No Data/Parameter Exchange status in active Watchdog Mode, it
immediately invokes an unconditioned IC Reset, switching all Data and Parameter Outputs inactive,
generating corresponding Data and Parameter Strobe signals, setting the Data_Exchange_Disable flag and
starting the IC initialization procedure.
In order to resume to normal Data Port communication after a Watchdog IC Reset, the master has to send a
Write_Parameter request again before Data Port communication can be reestablished. This ensures new
parameter setup of possibly connected external circuitry.
3.15. Toggle watchdog for 4I/4O processing in Extended Address Mode
As described in chapter 3.7.5 on page 40 a special 4I/4O data processing is supported in Extended Address
Mode. The transmission of a 4 bit wide output word is achieved by alternation of a high and a low nibble in
consecutive transactions. To ensure that both output nibbles become refreshed continuously by the Master,
the alternation of the I2 bit in the Data_Exchange call can be supervised by an I2 toggle watchdog in the IC.
The Toggle Watchdog is enabled at slave addresses unequal to zero (0) and while the IC is processing the
first data output event after initialization. It becomes disabled at any IC Reset or after the reception of a
Delete_Address request.
The Toggle Watchdog function becomes activated only if the IC is operated in 4I/4O Mode (ID_code = 0xA,
Ext_Addr_4I/4O_Mode = ‘1’) and if either the Watchdog_Active flag is set in the E²PROM or the
P0_Watchdog_Activation flag (also E²PROM) is set and Parameter Port P0 is logic HIGH.
If there is no alternation of bit I2 for 327ms (+16ms) at any time after the enable event, an activated Toggle
Watchdog invokes an unconditioned IC Reset, switching all Data and Parameter Outputs inactive, generating
corresponding Data and Parameter Strobe signals, setting the Data_Exchange_Disable flag and starting the
IC initialization procedure. Thus, the reaction of the IC is the same as for an expired Communication
Watchdog.
Data Sheet
January 30, 2012
ASI4U / ASI4U-E
Spec. 3.0 Com
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 2.1
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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