256-bit Electrically Erasable Programmable Read Only Memory
(EEPROM) plus 64-bit one-time programmable application register
Unique, factory-lasered and tested 64-bit registration number
(8-bit family code + 48-bit serial number + 8-bit CRC tester)
assures absolute identity because no two parts are alike
Built-in multidrop controller ensures compatibility with other
MicroLAN products
EEPROM organized as one page of 32 bytes for random access
Reduces control, address, data, and power to a single data pin
Directly connects to a single port pin of a microprocessor and
communicates at up to 15.3kbits per second
8-bit family code specifies DS2430A communication requirements to
reader
Presence detector acknowledges when reader first applies voltage
Low cost TO-92 or 6-pin TSOC and UCSP surface mount package
Reads and writes over a wide voltage range of 2.8V to 5.25V from
-40°C to +85°C
DESCRIPTION
The DS2430A 256-bit 1-Wire® EEPROM identifies and stores relevant
information about the product to which it is associated. This lot
or product specific information can be accessed with minimal
interface, for example a single port pin of a microcontroller. The
DS2430A consists of a factory-lasered registration number that
includes a unique 48-bit serial number, an 8-bit CRC, and an 8-bit
Family Code (14h) plus 256 bits of user-programmable EEPROM and a
64-bit one-time programmable application register. The power to
read and write the DS2430A is derived entirely from the 1-Wire
communication line. Data is transferred serially via the 1-Wire
protocol, which requires only a single data lead and a ground
return. The 48-bit serial number that is factory-lasered into each
DS2430A provides a guaranteed unique identity that allows for
absolute traceability. The TO-92 and TSOC packages provide a
compact enclosure that allows standard assembly equipment to handle
the device easily for attachment to printed circuit boards or
wiring. Typical applications include storage of calibration
constants, board identification, and product revision status.
OVERVIEW
The block diagram in Figure 1 shows the relationships between the
major control and memory sections of the DS2430A. The DS2430A has
four main data components: 1) 64-bit lasered ROM, 2) 256-bit EEPROM
data memory with scratchpad, 3) 64-bit one-time programmable
application register with scratchpad and 4) 8-bit status memory.
The hierarchical structure of the 1-Wire protocol is shown in
Figure 2. The bus master must first provide one of the four ROM
Function Commands: 1) Read ROM, 2) Match ROM, 3) Search ROM, 4)
Skip ROM. The protocol required for these ROM Function Commands is
described in Figure 8. After a ROM Function Command is successfully
executed, the memory functions become accessible and the master can
provide any one of the four memory function commands. The protocol
for these memory function commands is described in Figure 6. All
data is read and written least significant bit first
Founded in 2004, Walton Electronics CO.,LTD is a scaled and
professional independent distributor of electronic components in
Shenzhen , China. Committed to the world's leading brands of
electronic components distribution integration services, mainly
engaged in active components , integrated circuit chips.
We provide products and services in all areas of the electronics
industry, including: automotive, medical, consumer electronics,
industrial control, Internet of Things, new energy,communications,
military and so on.
