ASI4UC-G1-MT ZMDI, ASI4UC-G1-MT Datasheet - Page 24

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

Specifications of ASI4UC-G1-MT

• 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

2.5. E²PROM
The ASI4U provides an on-chip E²PROM with typical write times of 12.5 ms and read times of 110ns. For
security reasons the memory area is structured in two independent data blocks and a single bit Security flag.
The data blocks are named User Area and Firmware Area. The Firmware Area contains all manufacturing
related configuration data (i.e. selection of operational modes, ID codes, …). It can be protected against
undesired data modification by setting the Program_Mode_Disable flag to ‘1’.
The User Area contains only such data that is relevant for changes at the final application (i.e. field installation
of slave module). The environment, where modifications of the user data may become necessary, can
sometimes be rough and unpredictable. In order to ensure a write access cannot result in an undetected
corruption of E²PROM data, additional security is provided when programming the User Area.
Any write access to the User Area (by calls Address_Assignment or Write_ID_Code1) is accompanied by two
write steps to the Security flag, one before and one after the actual modification of user data.
The following procedure is executed when writing to the User Area of the E²PROM:
In addition to a read out of the data areas, the Security flag of the E²PROM is also read and evaluated during
IC initialization. In case the value of the Security flag equals ‘1’ (i.e. due to an undesired interruption of a User
Area write access), the entire User Area data is treated as corrupted and the Slave Address is set to 0x0 in
the corresponding volatile shadow registers during initialization. Thus the programming of the User Area data
can be repeated.
Table 7: E²PROM Content
ASI4U internal E²PROM
Address [hex]
0
1
2
2
3 … 7
8
9
A
B
Data Sheet
January 30, 2012
ASI4U / ASI4U-E
Spec. 3.0 Com
1. The Security flag is programmed to ‘1’.
2. The content of the Security flag is read back, verifying it was programmed to ‘1’.
3. The user data is modified.
4. A read back of the written data is performed.
5. If the read back has proven successful programming of the user data, the Security
6. The content of the Security flag is read back, verifying it was programmed to ‘0’.
flag is programmed back to ‘0’.
© 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.
pliant Universal AS-I IC
Bit
Position
0 … 3
0
0 … 2
3
0 … 3
0 … 3
0 … 3
0
1
2
3
EEPROM Cell Content
A0 … A3
A4
ID1_Bit0 … ID1_Bit2
ID1_Bit3
ID_Bit0 … ID_Bit3
ID2_Bit0 … ID2_Bit3
IO_Bit0 … IO_Bit3
Multiplex_Data
Multiplex_Paramter
P0_Watchdog_Activation
Watchdog_Active
EEPROM Register Content
Slave address low nibble
Slave address high nibble
ID_Code_Extension_1
ID_Code_Extension_1, A/B slave selection in
extended address mode
Not implemented
ID_Code
ID_Code_Extension_2
IO_Code
Multiplexed bi-directional Data Port mode
Multiplexed bi-directional Parameter Port mode
Watchdog can be activated/deactivated by the
logic value at parameter pin P0.
Watchdog_Active must not be set.
Communication
activated.
watchdog
is
24 of 63
continuously