DS2431-A1 Rev 1 3/08 1024-Bit, 1-Wire EEPROM for Automotive Applications General Description Features The DS2431-A1 is an AEC-Q100 Grade 1 qualified ver- 1024 Bits of EEPROM Memory Partitioned Into sion of the DS2431. The logical behavior of both ver- Four Pages of 256 Bits sions is identical. The DS2431-A1 is a 1024-bit, 1-Wire Individual Memory Pages Can Be Permanently EEPROM chip organized as four memory pages of 256 Write Protected or Put in EPROM-Emulation Mode bits each. Data is written to an 8-byte scratchpad, veri- (Write to 0) fied, and then copied to the EEPROM memory. As a special feature, the four memory pages can individually Switchpoint Hysteresis and Filtering to Optimize be write protected or put in EPROM-emulation mode, Performance in the Presence of Noise where bits can only be changed from a 1 to a 0 state. IEC 1000-4-2 Level 4 ESD Protection (+8kV The DS2431-A1 communicates over the single-conduc- Contact, +15kV Air, Typ) tor 1-Wire bus. The communication follows the standard Reads and Writes Over a 4.5V to 5.25V Voltage 1-Wire protocol. Each device has its own unalterable and unique 64-bit ROM registration number that is fac- Range from -40C to +125C tory lasered into the chip. The registration number is Communicates to Host with a Single Digital used to address the device in a multidrop 1-Wire net Signal at 15.4kbps Using 1-Wire Protocol environment. Meets AEC-Q100 Grade 1 Qualification Requirements Applications Also Available as Standard Version for Industrial Temperature Range (DS2431) Automotive Sensor Identification and Calibration Data Storage Automotive Cable Assembly Identification Ordering Information Accessory/PCB Identification PART TEMP RANGE PIN-PACKAGE DS2431P-A1+ -40C to +125C 6 TSOC DS2431P-A1+T -40C to +125C 6 TSOC Commands and modes are capitalized for clarity. +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. Typical Operating Circuit Pin Configuration V CC TOP VIEW R PUP + GND 1 6 N.C. I/O I/O 2 5 N.C. DS2431-A1 C DS2431-A1 N.C. 3 4 N.C. GND TSOC 1-Wire is a registered trademark of Maxim Integrated Products, Inc. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.1024-Bit, 1-Wire EEPROM for Automotive Applications ABSOLUTE MAXIMUM RATINGS I/O Voltage to GND .....................................................-0.5V, +6V Junction Temperature......................................................+150C I/O Sink Current ..................................................................20mA Storage Temperature Range .............................-55C to +125C Operating Temperature Range .........................-40C to +125C Soldering Temperature .....................See IPC/JEDEC J-STD-020 specification. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (T = -40C to +125C) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS I/O PIN GENERAL DATA 1-Wire Pullup Voltage V (Note 2) 4.5 5.25 V PUP 1-Wire Pullup Resistance R (Notes 2, 3) 0.3 2.2 k PUP Input Capacitance C (Notes 4, 5) 1000 pF IO Input Load Current I I/O pin at V 0.05 10 A L PUP V - PUP High-to-Low Switching Threshold V (Notes 5, 6, 7) 0.5 V TL 1.8 Input Low Voltage V (Notes 2, 8) 0.5 V IL V - PUP Low-to-High Switching Threshold V (Notes 5, 6, 9) 1.0 V TH 1.0 Switching Hysteresis V (Notes 5, 6, 10) 0.21 1.70 V HY Output Low Voltage V At 4mA (Note 11) 0.4 V OL Recovery Time t R = 2.2k (Notes 2, 12) 5 s REC PUP Rising-Edge Hold-Off Time t (Notes 5, 13) 0.5 5.0 s REH Time Slot Duration t (Notes 2, 14) 65 s SLOT I/O PIN, 1-Wire RESET, PRESENCE-DETECT CYCLE Reset Low Time t (Note 2) 480 640 s RSTL Presence-Detect High Time t 15 60 s PDH Presence-Detect Low Time t 60 240 s PDL Presence-Detect Sample Time t (Notes 2, 15) 60 75 s MSP I/O PIN, 1-Wire WRITE Write-0 Low Time t (Notes 2, 16) 60 120 s W0L Write-1 Low Time t (Notes 2, 16) 1 15 s W1L I/O PIN, 1-Wire READ Read Low Time t (Notes 2, 17) 5 15 - s RL Read Sample Time t (Notes 2, 17) t + 15 s MSR RL EEPROM Programming Current I (Notes 5, 18) 0.8 mA PROG Programming Time t (Note 19) 10 ms PROG At +25C 200k Write/Erase Cycles (Endurance) N At +85C 50k CY (Notes 20, 21) At +125C 1k Data Retention t At +125C (worst case) 10 Years DR (Notes 22, 23, 24) 2 DS2431-A1