PDF MAX1617DBR2 Data sheet ( Hoja de datos )

Número de pieza	MAX1617DBR2
Descripción	SMBus Temperature Sensor with Internal and External Diode Input
Fabricantes	ON Semiconductor
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No Preview Available ! MAX1617 SMBus Temperature Sensor with Internal and External Diode Input The MAX1617 is a serially programmable temperature sensor optimized for monitoring modern high performance CPUs with on–board, integrated temperature sensing diodes. Temperature data is converted from the CPU’s diode outputs and made available as an 8–bit digital word. Communication with the MAX1617 is accomplished via the standard System Management Bus (SMBus) commonly used in modern computer systems. This permits reading the current internal/external temperature, programming the threshold setpoints, and configuring the device. Additionally, an interrupt is generated on the ALERT pin when temperature moves outside the preset threshold windows in either direction. A Standby command may be sent via the SMBus by signaling the STBY input to activate the low–power Standby mode. Registers can be accessed while in Standby mode. Address selection inputs allow up to nine MAX1617s to share the same 2–wire SMBus for multi–zone monitoring. All registers can be read by the host, and both polled and interrupt driven systems are easily accommodated. Small size, low installed cost, and ease of use make the MAX1617 an ideal choice for implementing sophisticated system management schemes, such as ACPI. Features • Includes Internal and External Sensing Capability • Outputs Temperature As 8–Bit Digital Word • Solid State Temperature Sensing; 1°C Resolution • 3.0 — 5.5V Operating Range • Independent Internal and External Threshold Set–Points With ALERT Interrupt Output • SMBus 2–Wire Serial Interface • Up To 9 MAX1617s May Share the Same Bus • Low Standby Power Mode • Low Power: 70 µA (max) Operating, 10 µA (max) Standby Mode • 16–Pin Plastic QSOP Package • Operating Temperature Range: –55°C to +125°C Typical Applications • Thermal Protection For Intel “Deschutes” Pentium II™ and Other High Performance CPUs with Integrated On–Board Diode - No Sensor Mounting Problems! • Accurate Temperature Sensing From Any Silicon Junction Diode • Thermal Management in Electronic Systems: Computers, Network Equipment, Power Supplies http://onsemi.com 16–Pin QSOP DB SUFFIX CASE TBD PRELIMINARY INFORMATION PIN CONFIGURATION (Top View) NC 1 16 NC VDD D+ D– NC 2 15 STBY 3 14 SCL 4 13 NC 5 MAX1617 12 SDA ADD1 6 11 ALERT GND 7 10 ADD0 GND 8 9 NC ORDERING INFORMATION Device Package Shipping MAX1617DBR2 16–Pin QSOP 2500 Tape/Reel © Semiconductor Components Industries, LLC, 1999 February, 2000 – Rev. 0 1 Publication Order Number: MAX1617/D 1 page MAX1617 SMBus PORT AC TIMING (VDD = 3.3 V, –55°C ≤ (TA = TJ) ≤ 125°C; CL = 80 pF, unless otherwise noted.) Symbol Characteristic Min Typ fSMB tLOW tHIGH tR tF tSU(START) SMBus Clock Frequency Low Clock Period (10% to 10%) High Clock Period (90% to 90%) SMBus Rise Time (10% to 90%) SMBus Fall Time (90% to 10%) Start Condition Setup Time (90% SCL to 10% SDA) (for Repeated Start Condition) 10 — 4.7 — 4— —— —— 4— tH(START) tSU–DATA tH–DATA tSU(STOP) tIDLE Start Condition Hold Time Data in Setup Time Data in Hold Time Stop Condition Setup Time Bus Free Time Prior to New Transition 4 1,000 1,250 4 4.7 — — — — — SMBUS Write Timing Diagram SCL AB ILOW IHIGH C D EF G H IJ Max 100 — — 1,000 300 — — — — — — Unit kHz msec msec nsec nsec msec msec nsec nsec msec msec K LM SDA t SU(START) t H(START) t SU–DATA t H–DATA t SU(STOP) t IDLE A = Start Condition B = MSB of Address Clocked into Slave C = LSB of Address Clocked into Slave D = R/W Bit Clocked into Slave E = Slave Pulls SDA Line Low F = Acknowledge Bit Clocked into Master J = Acknowledge Clocked into Master G = MSB of Data Clocked into Slave K = Acknowledge Clock Pulse H = LSB of Data Clocked into Slave L = Stop Condition, Data Executed by Slave I = Slave Pulls SDA Line Low M= New Start Condition SMBUS Read Timing Diagram AB ILOW IHIGH C SCL D EF G HI JK SDA t SU(START) t H(START) t SU–DATA A = Start Condition B = MSB of Address Clocked into Slave C = LSB of Address Clocked into Slave D = R/W Bit Clocked into Slave E = Slave Pulls SDA Line Low F = Acknowledge Bit Clocked into Master G = MSB of Data Clocked into Master H = LSB of Data Clocked into Master t SU(STOP) t IDLE I = Acknowledge Clock Pulse J = Stop Condition K = New Start Condition http://onsemi.com 5 5 Page MAX1617 Status Register (Status) D[7] D[6] D[5] D[4] D[3] D[2] D[1] Busy Flag1 Flag2 Flag3 Flag4 Flag5 Flag6 D[0] Re- served Bit(s) D[7] D[6] D[5] D[4] D[3] D[2] D[1:0] POR State 0 0 0 0 0 0 0 Function Signal A/D converter is busy. Interrupt flag for INT_HLIM event Interrupt flag for INT_LLIM event Interrupt flag for EXT_HLIM event Interrupt flag for EXT_LLIM event External diode “fault” flag Reserved — Always returns zero. Operation* 1 = A/D busy, 0 = A/D idle 1 = interrupt occurred, 0 = none 1 = interrupt occurred, 0 = none 1 = interrupt occurred, 0 = none 1 = interrupt occurred, 0 = none 1 = external diode fault 0 = external diode OK N/A NOTE: All status bits are cleared after a read operation is performed on STATUS. The EXT_TEMP register will read +127°C if an external diode “open” is detected. Manufacturer’s Identification Register (MFR_ID), 8–Bits, Read Only: Manufacturer’s Identification Register (MFR_ID) D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] MSB X X X X X X LSB Manufacturer’s Revision Register (MFR_REV), 8–Bits, Read Only: Manufacturer’s Revision Register (MFR_REV) D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] MSB X X X X X X LSB Register Set Summary: The MAX1617’s register set is summarized in the following table. All registers are 8–bits wide. Name Description POR State Read Write INT_TEMP Internal sensor temperature (2’s complement) 0000 0000b* √ EXT_TEMP External sensor temperature (2’s complement) 0000 0000b* √ STATUS STATUS register 0000 0000b √ CONFIG CONFIG register 0000 0000b √ √ CONV_RATE A/D conversion rate register 0000 0010b √ √ INT_HLIM Internal high limit (2’s complement) 0111 1111b √ √ INT_LLIM Internal low limit (2’s complement) 1100 1001b √ √ EXT_HLIM External high limit (2’s complement) 0111 1111b √ √ EXT_LLIM External low limit (2’s complement) 1100 1001b √ √ MFR_ID ASCII for letter “T” 0101 0100b √ MFR_REV Serial device revision # √ CRITICAL CRITICAL limit (2’s complement) N/A √* NOTE: The INT_TEMP and EXT_TEMP register immediately will be updated by the A/D converter after POR. If STBY is low at power–up, INT_TEMP and EXT_TEMP will remain in POR state (0000 0000b). MFR_REV will sequence 01h, 02h, 03h, etc. by mask changes. **CRITICAL only can be written via the CRIT[1:0] pins. It cannot be accessed through the SMBus port. http://onsemi.com 11 11 Page

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