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PDF DS28E80 Data sheet ( Hoja de datos )
| Número de pieza | DS28E80 | |
| Descripción | Gamma Radiation Resistant 1-Wire Memory | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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DS28E80
EVALUATION KIT AVAILABLE
Gamma Radiation Resistant 1-Wire Memory
General Description
The DS28E80 is a user-programmable nonvolatile mem-
ory chip. In contrast to the floating-gate storage cells,
the DS28E80 employs a storage cell technology that is
resistant to gamma radiation. The DS28E80 has 248
bytes of user memory that are organized in blocks of
8 bytes. Individual blocks can be write-protected. Each
memory block can be written 8 times. The DS28E80
communicates over the single-contact 1-Wire® bus at
standard speed or overdrive speed. Each device has its
own guaranteed unique 64-bit registration number that is
factory programmed into the chip. The communication fol-
lows the 1-Wire protocol with a 64-bit registration number
acting as node address in the case of a multiple-device
1-Wire network.
Applications
●● Identification of Medical Consumables
●● Identification and Calibration Medical Tools/Accessories
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
Ordering Information appears at end of data sheet.
Features and Benefits
●● High Gamma Resistance Allows User-Programmable
Manufacturing or Calibration Data Before Medical
Sterilization
• Resistant Up to 75kGy (kiloGray) of Gamma Radiation
• Reprogrammable 248 Bytes of User Memory
●● Lower Block Size Provides Greater Flexibility in
Programming User Memory
• Memory is Organized as 8-Byte Blocks
• Each Block Can Be Written 8 Times
• User-Programmable Write Protection for Individual
Memory Blocks
●● Advanced 1-Wire Protocol Minimizes Interface to
Just Single Contact
●● Compact Package and Single IO Interface Reduces
Board Space and Enhances Reliability
• Unique Factory-Programmed, 64-Bit Identification
Number
• Communicates at 1-Wire Standard Speed
(15.3kbps max) and Overdrive Speed (76kbps max)
• Operating Range: 3.3V ±10%, -40°C to + 85°C
Reading, 0°C to +50°C Writing
• ±8kV HBM ESD Protection (typ) for IO Pin
• 6-Pin TDFN Package
Typical Application Circuit
VCC
VCC
PIOX
µC
PIOY
GND
10kΩ
BSS84
RPUP
DS28E80
IO
GND
19-7120; Rev 0; 9/14
1 page  
DS28E80
Gamma Radiation Resistant 1-Wire Memory
PARASITE POWER
1-Wire BUS
1-Wire
FUNCTION CONTROL
DS28E80
MEMORY
FUNCTION CONTROL
CRC-16
GENERATOR
USER
MEMORY
Figure 1. DS28E80 Block Diagram
64-BIT
ROM ID
ADMINISTRATION
MEMORY
PROTECTION
MEMORY
WRITE BUFFER
COMMAND
LEVEL:
1-Wire ROM
FUNCTION COMMANDS
DS28E80-SPECIFIC
MEMORY FUNCTION
COMMANDS
DS28E80
AVAILABLE
COMMANDS:
READ ROM
MATCH ROM
SEARCH ROM
SKIP ROM
RESUME
OVERDRIVE-SKIP ROM
OVERDRIVE-MATCH ROM
WRITE BLOCK
READ MEMORY
WRITE PROTECT BLOCK
READ BLOCK PROTECTION
READ REMAINING CYCLES
DATA FIELD
AFFECTED:
64-BIT ROM ID, RC-FLAG
64-BIT ROM ID, RC-FLAG
64-BIT ROM ID, RC-FLAG
RC-FLAG
RC-FLAG
RC-FLAG, OD-FLAG
64-BIT ROM ID, RC-FLAG, OD-FLAG
USER MEMORY, ADMINISTRATION
MEMORY, PROTECTION
MEMORY, WRITE BUFFER
USER MEMORY
PROTECTION MEMORY
PROTECTION MEMORY
ADMINISTRATION MEMORY
Figure 2. Hierarchical Structure for 1-Wire Protocol
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
DS28E80
Gamma Radiation Resistant 1-Wire Memory
Read Block Protection
The Read Block Protection command is used to read the protection status of a memory block. To detect transmission
errors when issuing this command, the DS28E80 generates and transmits a CRC after the parameter byte. After the
CRC, the master receives the protection status byte. If the block is unprotected, the code is 0Fh; the code for a protected
block is F0h. If the master continues reading, the DS28E80 transmits the protection status byte of the next block, and
so on. After the status byte of the last memory block is read and the master continues reading, it reads FFh bytes. The
master can end the Read Block Protection command at any time by issuing a reset pulse.
READ BLOCK PROTECTION
Command Code
AAh
Parameter Byte
Starting block number (Table 5)
Restrictions
None. The command can be issued at any time.
Protocol Variations
None
Error Conditions
• Invalid parameter byte
CS Byte
N/A
CRCS Computation
Shifting (least-significant bit first) the command code and then the parameter byte into the cleared
CRC-16 generator.
Table 5. Parameter Byte Bitmap
BIT 7
X
BIT 6
X
BIT 5
X
BIT 4
BIT 3
BIT 2
BN
BIT 1
BIT 0
Bits marked as X can be transmitted as 0 or 1 without affecting the command.
Bits[4:0]: Block Number (BN). These bits specify the number of the first memory block for which to read the protection.
Valid block numbers are 00000b (start of memory) to 11110b (last block of user memory).
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
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| PDF Descargar | [ Datasheet DS28E80.PDF ] | |
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