Datasheet

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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Identication

● MedicalSensorCalibrationDataStorage

● AnalogSensorCalibration

● AftermarketManagementofConsumables

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

19-6568; Rev 1; 1/14

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.

Typical Application Circuit

1-Wire is a registered trademark of Maxim Integrated Products, Inc.

PUP

µC

GND

DS28E05

Summary of content (17 pages)

PAGE 1
DS28E05 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 identification number (ROM ID) that is factory programmed into the chip.
PAGE 2
DS28E05 1-Wire EEPROM Absolute Maximum Ratings IO Voltage Range to GND.......................................-0.5V to 4.0V IO Sink Current.................................................................±20mA Operating Temperature Range ........................... -40°C to +85°C Junction Temperature.......................................................+150°C Storage Temperature Range............................. -55°C to +125°C Lead Temperature (soldering, 10s)..................................
PAGE 3
DS28E05 1-Wire EEPROM Electrical Characteristics (continued) (TA = -40°C to +85°C, unless otherwise noted.) (Note 1) Note 1: Limits are 100% production tested at TA = +25°C and/or TA = +85°C. Limits over the operating temperature range and relevant supply voltage range are guaranteed by design and characterization. Typical values are not guaranteed. Note 2: System requirement. Note 3: Maximum allowable pullup resistance is a function of the number of 1-Wire devices in the system and 1-Wire recovery times.
PAGE 4
DS28E05 1-Wire EEPROM Pin Configurations TOP VIEW TOP VIEW IO 1 + + DS28E05 0Drr 3 GND N.C. 2 GND 1 IO 2 N.C. 3 6 N.C. DS28E05 5 N.C. 4 N.C. TSOC SOT23 Pin Descriptions PIN SOT23 TSOC NAME 2 3–6 N.C. 1 2 IO 3 1 GND FUNCTION Not Connected 1-Wire Bus Interface. Open-drain signal that requires an external pullup resistor.
PAGE 5
DS28E05 1-Wire EEPROM PARASITE POWER 1-Wire NET 1-Wire FUNCTION CONTROL DS28E05 64-BIT ROM ID MEMORY FUNCTION CONTROL USER EEPROM 7 PAGES OF (128 BITS EACH) ADMINISTRATIVE DATA (64 BITS) Figure 1.
PAGE 6
DS28E05 1-Wire EEPROM POLYNOMIAL = X8 + X5 + X4 + 1 1ST STAGE X0 2ND STAGE X1 3RD STAGE X2 4TH STAGE 5TH STAGE X3 6TH STAGE X4 7TH STAGE X5 X6 8TH STAGE X7 X8 INPUT DATA Figure 4. 1-Wire CRC Generator Table 1.
PAGE 7
DS28E05 1-Wire EEPROM ADDRESS RANGE TYPE DESCRIPTION 0000h to 000Fh R/(W) User memory page 0 PROTECTION CODES — 0010h to 001Fh R/(W) User memory page 1 — 0020h to 002Fh R/(W) User memory page 2 — 0030h to 003Fh R/(W) User memory page 3 — 0040h to 004Fh R/(W) User memory page 4 — 0050h to 005Fh R/(W) User memory page 5 — 0060h to 006Fh R/(W) User memory page 6 — 0070h* R/(W) Page protection PPA, lower nibble: page 0; upper nibble: page 1 0h: open (factory default); Ah: EPR
PAGE 8
DS28E05 1-Wire EEPROM F0h READ MEMORY? MASTER Tx MEMORY FUNCTION COMMAND 55h WRITE MEMORY? N Y FROM ROM FUNCTIONS FLOWCHART (FIGURE 8) N Y MASTER Tx STARTING ADDRESS T[15:0] MASTER Tx PARAMETER BYTE MASTER Tx FFh BYTE N ADDRESS < 0080h? N Y DS28E05 SETS MEMORY ADDRESS = (T[15:0]) PARAMETER BYTE AND FFh BYTE VALID? Y MASTER Tx 2 DATA BYTES MASTER Rx DATA BYTE FROM MEMORY ADDRESS DS28E05 INCREMENTS ADDRESS COUNTER MASTER Tx RESET? MASTER Rx (READS BACK) 2 DATA BYTES AND VERIFIES N Y MASTE
PAGE 9
DS28E05 1-Wire EEPROM Write Memory [55h] The Write Memory command is used to program one or more contiguous 2-byte segments of a memory page. This command is applicable only to memory locations that are not write protected. The parameter byte specifies the page and segment number where the writing begins. The new segment data is transmitted in the sequence B0, B1. Table 2 shows the how these bytes map to the addressed memory page.
PAGE 10
DS28E05 1-Wire EEPROM Read Memory [F0h] The Read Memory command is used to read the memory. The command needs a 16-bit starting address TA1, TA2. The parameter byte specifies the lower address byte (TA1, T[6:0]) where the reading begins. After the parameter byte, the master transmits TA2 (T[15:8]), which must be 00 to be valid. The reading can start at any valid starting address and continue trough the end of the memory.
PAGE 11
DS28E05 A multidrop bus consists of a 1-Wire bus with multiple slaves attached. The DS28E05 supports overdrive speed of 76.9kbps (max) only and cannot be used together with standard speed or dual-speed 1-Wire slaves on the bus. The value of the pullup resistor primarily depends on the 1-Wire pullup voltage, network size and load conditions. The DS28E05 requires a pullup resistor of maximum 1.5kΩ. The idle state for the 1-Wire bus is high.
PAGE 12
DS28E05 1-Wire EEPROM BUS MASTER Tx RESET PULSE FROM MEMORY FUNCTION FLOWCHART (FIGURE 6) BUS MASTER Tx ROM FUNCTION COMMAND 33h READ ROM COMMAND? DS28E05 Tx PRESENCE PULSE N 55h MATCH ROM COMMAND? F0h SEARCH ROM COMMAND? N N CCh SKIP ROM COMMAND? Y Y Y Y RC = 0 RC = 0 RC = 0 RC = 0 N A5h RESUME COMMAND? Y RC = 1? DS28E05 Tx FAMILY CODE (1 BYTE) DS28E05 Tx BIT 0 MASTER Tx BIT 0 DS28E05 Tx BIT 0 N N Y BIT 0 MATCH? Y Y DS28E05 Tx BIT 1 MASTER Tx BIT 1 DS28E05 Tx BIT 1 MASTER Tx B
PAGE 13
DS28E05 1-Wire EEPROM Resume Command [A5h] and memory function command. If the bus master uses slew-rate control on the falling edge, it must pull down the line for tRSTL + tF to compensate for the edge. To maximize the data throughput in a multidrop environ ment, the Resume command is available. This command checks the status of the RC bit and, if it is set, directly transfers control to the memory functions, similar to a Skip ROM command.
PAGE 14
DS28E05 1-Wire EEPROM WRITE-ONE TIME SLOT tW1L VPUP VIHMASTER VTH VTL VIL(MAX) 0V ε tF tSLOT RESISTOR MASTER WRITE-ZERO TIME SLOT tW0L VPUP VIHMASTER VTH VTL VIL(MAX) 0V ε tF tSLOT RESISTOR READ-DATA TIME SLOT tRL VPUP VIHMASTER VTH VTL VIL(MAX) 0V tREC MASTER tMSR MASTER SAMPLING WINDOW δ tF tSLOT RESISTOR MASTER tREC DS28E05 Figure 10. Read/Write Timing Diagrams Slave-to-Master A read-data time slot begins like a write-one time slot.
PAGE 15
DS28E05 1-Wire EEPROM The sum of tRL + δ (rise time) on one side and the internal timing generator of the DS28E05 on the other side define the master sampling window (tMSR(MIN) to tMSR(MAX)), in which the master must perform a read from the data line. For the most reliable communication, tRL should be as short as permissible, and the master should read close to but no later than tMSR(MAX). After reading from the data line, the master must wait until tSLOT is expired.
PAGE 16
DS28E05 1-Wire EEPROM 1-Wire Communication Examples (continued) Write Memory Writing within a page, not reaching the end of the page. RST PD Select WM PB FFh Data Data Release Wait tPROG CS = AAh RST Repeat Writing through the end of the page.
PAGE 17
DS28E05 1-Wire EEPROM Revision History REVISION NUMBER REVISION DATE 0 12/12 Initial release 1 1/14 Expanded VPUP (min) to 2.75V and VIL (max) to 0.5V DESCRIPTION PAGES CHANGED — 1, 2 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product.