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DS28E05 Schematic ( PDF Datasheet ) - Maxim Integrated

Teilenummer DS28E05
Beschreibung 1-Wire EEPROM
Hersteller Maxim Integrated
Logo Maxim Integrated Logo 




Gesamt 17 Seiten
DS28E05 Datasheet, Funktion
DS28E05
1-Wire EEPROM
General Description
The DS28E05 is a 112-byte user-programmable EEPROM
organized as 7 pages of 16 bytes each. Memory pages
can be individually set to write protected or EPROM
emulation mode through protection byte settings. Each
part has its own guaranteed unique 64-bit ROM identi-
fication number (ROM ID) that is factory programmed
into the chip. The DS28E05 communicates over Maxim
Integrated’s single contact 1-Wire® interface at overdrive
speed with the ROM ID acting as node address in the
case of a multiple-device 1-Wire network.
Applications
● Accessory/PCB Identification
● Medical Sensor Calibration Data Storage
● Analog Sensor Calibration
● Aftermarket Management of Consumables
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part, refer
to www.maximintegrated.com/DS28E05.related.
Features
● Single-Contact 1-Wire Interface
● 112 Bytes User EEPROM with 1K Write Cycles
● Programmable Write Protection and OTP EPROM
Emulation Modes for User Memory
● Unique Factory-Programmed 64-Bit ROM ID Number
● Communicates with Host at Up to 76.9kbps
(Overdrive Only)
● Operating Range: 2.75V to 3.63V, -40°C to +85°C
● ±8kV HBM ESD Protection (typ) on IO Pin
● 3-Pin SOT23 and 6-Pin TSOC Packages
Typical Application Circuit
VCC
µC
RPUP
IO
DS28E05
GND
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
19-6568; Rev 1; 1/14






DS28E05 Datasheet, Funktion
DS28E05
1-Wire EEPROM
POLYNOMIAL = X8 + X5 + X4 + 1
1ST
STAGE
2ND
STAGE
3RD
STAGE
4TH
STAGE
X0 X1 X2 X3
Figure 4. 1-Wire CRC Generator
5TH
STAGE
X4
6TH
STAGE
7TH
STAGE
8TH
STAGE
X5 X6 X7 X8
INPUT DATA
Table 1. Memory Resources
NAME
User memory (EEPROM)
Administrative data
ROM ID
SIZE
(BYTES)
112
8
8
ACCESS MODE
Read, (Write)
Read, (Write),
Internal Read
Read, Internal
Read
PURPOSE
Application-specific data storage
Page protection settings, factory bytes, user bytes/manufacturer ID
1-Wire network device address
Table 2. Address to Segment Mapping
Segment 7 Segment 6 Segment 5 Segment 4 Segment 3 Segment 2
B1 B0 B1 B0 B1 B0 B1 B0 B1 B0 B1 B0
Page 0 (0Fh)
(08h)
Page 1 (1Fh)
(18h)
Page 2 (2Fh)
(28h)
Page 3 (3Fh)
(38h)
Page 4 (4Fh)
(48h)
Page 5 (5Fh)
(58h)
Page 6 (6Fh)
(68h)
Page 7
ROM ID
Factory
MAN. ID/U.
Legend: (5Fh) → designates memory location 5Fh. Text without brackets refers to the register name.
Segment 1
B1 B0
PPD PPC
Segment 0
B1 B0
(00h)
(10h)
(20h)
(30h)
(40h)
(50h)
(60h)
PPB PPA
Memory Resources
The memory of the DS28E05 consists of user memory,
administrative data, and a ROM ID. Table 1 shows the
size, access mode and purpose of the various memory
areas. Brackets around an access mode indicate possible
restrictions, such as write protection or read protection.
The memory is organized as 8 pages of 16 bytes each
(Figure 5). Each page consists of 8 segments. Table 2
shows how the segments relate to a memory address.
Pages 0 to 6 are the user memory. Page 7 contains
the administrative data and the ROM ID. The function
memory locations 0074h to 0075h depends on the code
in the Factory Word (addresses 0076h to 0077h). The
Manufacturer ID can be a customer-supplied identification
code that assists the application software in identifying
the product the DS28E05 is associated with. Contact the
factory to set up and register a custom manufacturer ID.
Write protection or EPROM emulation mode is activated
through the Write Memory command by writing to the
corresponding locations (PPA to PPD) in the administra-
tive data page. Once a protection is activated, it cannot
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6 Page









DS28E05 pdf, datenblatt
DS28E05
1-Wire EEPROM
FROM MEMORY FUNCTION
FLOWCHART (FIGURE 6)
BUS MASTER Tx ROM
FUNCTION COMMAND
BUS MASTER Tx
RESET PULSE
DS28E05 Tx
PRESENCE PULSE
33h
READ ROM
COMMAND?
Y
RC = 0
N
55h
MATCH ROM
COMMAND?
Y
RC = 0
N
F0h
SEARCH ROM
COMMAND?
Y
RC = 0
N
DS28E05 Tx
FAMILY CODE
(1 BYTE)
MASTER Tx BIT 0
DS28E05 Tx BIT 0
DS28E05 Tx BIT 0
MASTER Tx BIT 0
CCh
SKIP ROM
COMMAND?
Y
RC = 0
N
A5h
RESUME
COMMAND?
Y
N
RC = 1?
N
Y
DS28E05 Tx
SERIAL NUMBER
(6 BYTES)
BIT 0 MATCH? N
N BIT 0 MATCH?
Y
MASTER Tx BIT 1
Y
DS28E05 Tx BIT 1
DS28E05 Tx BIT 1
MASTER Tx BIT 1
MASTER Tx
RESET?
Y
N
DS28E05 Tx
CRC BYTE
BIT 1 MATCH? N
Y
MASTER Tx BIT 63
N BIT 1 MATCH?
Y
DS28E05 Tx BIT 63
DS28E05 Tx BIT 63
MASTER Tx BIT 63
BIT 63 MATCH? N
N BIT 63 MATCH?
Y
RC = 1
Y
RC = 1
TO MEMORY FUNCTIONS
FLOWCHART (FIGURE 6)
Figure 8. ROM Functions Flowchart
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Maxim Integrated 12

12 Page





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