DALLAS SEMICONDUCTOR DS824045-Co1 DS2404S-C01 Dual Port Memory Plus Time FEATURES Bridge for electronic equipment to the 1~Wire Micro- LAN 4096 bits of nonvolatile dual~port memory including real time clock/calendar in binary format, program- mable interval timer, and programmable power-on cycle counter 1~-Wire interface for MicroLAN communication at 16.3k bits per second 3-Wire host interface for high-speed data commu- nications at 2M bits per second Unique, factory-iasered and tested 64~bit registra- tion number (8~bit family code + 48-bit serial number + 8bit CRC tester) assures absolute traceability because no two parts are alike Memory partitioned into 16 pages of 256 bits for pack- etizing data @ 256bit scratchpad with strict read/write protocols ensures integrity of data transfer Programmable alarms can be set to generate inter- rupts for interval timer, reali time clock, and/or cycle counter Space saving 16pin SOIC package Operating temperature range from 40C to +85C Operating voltage range from 2.8 to 5.5 Volts DESCRIPTION in order to provide universal access to the MicroLAN, the DS2404S-C01 Dual Port Memory Plus Time has been developed. This device has both 1-Wire and a 3-Wire serial microcontroller interface. The DS2404S-C01 can be used to make complex functions involving microcontrollers behave as if they were iButtons. PIN ASSIGNMENT vecoet {Sg vec IRQCE 2 6 AO x1 RSTO] 3 who x2 po OE] 4 ja@-T0) GND vo OI 5 2H ne cLKOM 6 + (00) 1HZ Nc cic] 7 otto VBATO Gnd OLS stn VBATB 16-PIN SOIC (300 MIL) See Mech. Drawings Section PIN DESCRIPTION Pin # Pin Name Description Pin1&16 = ~Voec 2.8 to 5.5 Volts Pin 2 -1RQ interrupt Output Pin 3 ~ RST 3-Wire Reset Input Pin 4 - DQ 3Wire Input/Output Pin 5 -O 1wire Input/Output Pin 6 CLK 3Wire Clock Input Pin7&12 -NC No Connection Pin8&13 ~GND Ground Pin 9 ~ VeatB Battery Backup Input Pin 10 Veato Battery Operate input Pin 11 -~1Hz 1 Hz Output Pint14&15 -X4, Xo Crystal Connections Being a customROM version of the DS2404, the DS2404S-C01 has the family code 84H. In addition to this, the 12 most significant bit of the serialization field are coded 001H, leaving 28 bits for serialization. The communication with the DS2404SC01 through the 1-Wire port is identical to the DS1994; all functions of the DS1994 are available. 121