PDF STK18TA8 Data sheet ( Hoja de datos )

Número de pieza	STK18TA8
Descripción	nvTime Event Data Recorder Serial Peripheral Interface nvSRAM QuantumTrap CMOS Nonvolatile Static RAM
Fabricantes	SIMTEK
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No Preview Available ! www.DataSheet4U.com STK18TA8 nvTimeTM Event Data Recorder Serial Peripheral Interface nvSRAM QuantumTrapTM CMOS Nonvolatile Static RAM Preliminary FEATURES • Data integrity of Simtek nvSRAM Combined with Full-Featured Real-Time Clock • 40 MHZ SPI interface with compatible commands to industry standards 1 Mbit SPI EEPROMs • STORE to QuantumTrap™ Nonvolatile Elements is Initiated by Software , device pin or AutoStore™ on Power Down • RECALL to SRAM Initiated by Software or Power Restore • Unlimited READ and WRITE and RECALL Cycles • Watchdog Timer • Clock Alarm with programmable Interrupts • Capacitor or battery backup for RTC • Single 3V +20%, -10% Operation • Commercial and Industrial Temperatures • High-reliability o Endurance to 1 Million Cycles o Retention to 100 years at 85 ºC • Package: 48-Pin SSOP DESCRIPTION The Simtek STK18TA8 combines a 1 Mbit nonvolatile static RAM and a full-featured real-time clock, in a reliable, monolithic integrated circuit. A Serial Peripheral Interface (SPI) makes system integration simple. The embedded nonvolatile elements incorporate Simtek’s QuantumTrapTM technology producing the world’s most reliable nonvolatile memory. The SRAM provides unlimited read and write cycles, while independent, nonvolatile data resides in the highly reliable QuantumTrapTM cell. Data transfers from the SRAM to the nonvolatile elements (the STORE operation) takes place automatically at power down. On power up, data is restored to the SRAM (the RECALL operation) from the nonvolatile memory. Both the STORE and RECALL operations are also available under software control. The Real-Time Clock function provides an accurate clock with leap year tracking and a programmable, high accuracy oscillator. The Alarm function is programmable for one-time alarms or periodic seconds, minutes, hours, or days. There is also a programmable Watchdog Timer for process control. BLOCK DIAGRAM Quantum Trap 1024 X 1024 STORE VCC VCAP POWER CONTROL VRTCbat VRTCcap STATIC RAM ARRAY 1024 X 1024 RECALL STORE/ RECALL CONTROL HSB SCK www.DataSheet4U.comApril 2005 COLUMN I/O COLUMN DEC Data SPI CONTROLLER Address RTC Figure 1. Block Diagram SI SO HOLD CS X1 X2 INT 1 Document Control #ML0028 rev 0.8 1 page www.DataSheet4U.com STK18TA8 RTC DC CHARACTERISTICS Symbol Parameter Commercial MIN MAX IBAK RTC Backup Current - 300 VRTCbat RTC Battery Pin Voltage 1.8 3.3 VRTCcap RTC Capacitor Pin Voltage 1.2 2.7 tOSCS RTC Oscillator time to start -1 - 10 Industrial MIN MAX - 350 1.8 3.3 1.2 2.7 -1 - 10 Units Notes nA From either VRTCcap or VRTCbat Typical = 3.0 Volts during normal V operation Typical = 2.4 Volts during normal V operation @ MIN Temperature from Power up min or Enable sec @25ºC from Power up or Enable RTC RECOMMENDED COMPONENT CONFIGURATION X1 X2 Recommended Values Y1 = 32.768 KHz RF = 10M Ohm C1 = 2.2 pF C2 = 47 pF Figure 4. RTC COMPONENT CONFIGURATION www.ADprailt2a0S05heet4U.com 5 Document Control #ML0028 rev 0.8 5 Page www.DataSheet4U.com Table 1. SPITM INSTRUCTION SET Instruction Name Code Description READ WRITE FREAD CTLSEQ 0x03 0x02 0x0B 0x0F Read SRAM data from selected address. Write SRAM data from selected address. Fast read of SRAM data from selected address. (First byte is the delay byte). Device control command sequence. STK18TA8 Table 2. CONTROL COMMAND SEQUENCES Command Name CMD Bytes Description STORE 0x4E38 0xB1C7 0x83E0 0x7C1F 0x703F Commands Device to transfer the SRAM data to the nonvolatile memory elements. RECALL 0x8FC0 0x4E38 0xB1C7 0x83E0 0x7C1F 0x703F Commands Device to transfer the nonvolatile memory contents to the SRAM memory. AUTOENA 0x4C63 0x4E38 0xB1C7 0x83E0 0x7C1F 0x703F Turns on the AUTOSTORETM feature of the device, enabling automatic stores to nonvolatile memory when VCC drops below VSWITCH. AUTODIS 0x4B46 0x4E38 0xB1C7 0x83E0 0x7C1F 0x703F Turns off the AUTOSTORETM feature of the device, disabling the automatic stores to nonvolatile memory. STORES invoked by the control command STORE sequence and stores invoked by driving the HSB pin remain enabled. 0x8B45 www.ADprailt2a0S05heet4U.com 11 Document Control #ML0028 rev 0.8 11 Page

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