DS28E04-100 Datasheet, PDF (1/37 Pages) Dallas Semiconductor – 4096-Bit Addressable 1-Wire EEPROM with PIO

19-6134; Rev 12/11
DS28E04-100
4096-Bit Addressable 1-Wire EEPROM with PIO
GENERAL DESCRIPTION
The DS28E04-100 is a 4096-bit, 1-Wire^® EEPROM
chip with seven address inputs. The address inputs
are directly mapped into the 1-Wire 64-bit Device ID
Number to easily enable the host system to identify
the physical location or functional association of the
DS28E04-100 in a multidevice 1-Wire network en-
vironment. The 4096-bit EEPROM array is configured
as 16 pages of 32 bytes with a 32 byte scratchpad to
perform write operations. EEPROM memory pages
can be individually write protected or put in EPROM-
emulation mode, where bits can only be changed
from a 1 to a 0 state. In addition to the memory, the
DS28E04-100 has two general-purpose I/O ports that
can be used for input or to generate level and/or
pulse outputs. Activity registers also capture port
activity for state change monitoring. The DS28E04-
100 communicates over the single-contact 1-Wire
bus. The communication follows the standard Maxim
1-Wire protocol.
APPLICATIONS
Autoconfiguration of Modular Systems such as
Central-Office Switches, Cellular Base Stations,
Access Products, Optical Network Units, and
PBXs
Accessory/PCB Identification
TYPICAL OPERATING CIRCUIT
VCC
RPUP
FEATURES
• 4096 bits of EEPROM Memory Partitioned into
16 Pages of 256 Bits
• Seven Address Inputs for Physical Location
Configuration
• Two General-Purpose PIO Pins with Pulse-
Generation Capability
 Individual Memory Pages can be Permanently
Write-Protected or put in OTP EPROM-
Emulation Mode (“Write to 0”)
 Communicates to Host with a Single Digital
Signal at 15.3kbps or 111kbps Using 1-Wire
Protocol
 Parasitic or V_CC Powered
 Conditional Search Based on PIO Status or PIO
Activity
 Switchpoint Hysteresis and Filtering to Optimize
Performance in the Presence of Noise
 Reads and Writes Over a Wide 2.8V to 5.25V
Voltage Range from -40°C to +85°C
 16-Pin, 150-mil SO Package
ORDERING INFORMATION
PART
TEMP RANGE PIN-PACKAGE
DS28E04S-100+ -40°C to +85°C 16 SO
DS28E04S-100+T
-40°C to +85°C
16 SO
(2.5k pieces)
+ Indicates lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
PIN CONFIGURATION
PX.Y
µC
LED
IO VCC ^A6
POL
P1
P0
GND _A0
DS28E04 #1
IO VCC ^A6
POL
P1
P0
GND _A0
RST1 RST0 DS28E04 #7
SO (150 mils)
Commands, Registers, and Modes are capitalized for
clarity.
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
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