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 3.0–5.5 V 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 http://onsemi.com 16–Pin QSOP DB SUFFIX CASE TBD PRELIMINARY INFORMATION PIN CONFIGURATION NC 1 16 NC VDD 2 D+ 15 STBY 14 SCL 3 D– 4 13 NC NC 5 MAX1617 12 SDA ADD1 6 11 ALERT GND 7 10 ADD0 GND 8 9 NC (Top View) ORDERING INFORMATION Device Package Shipping MAX1617DBR2 16–Pin QSOP 2500 Tape/Reel 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 Semiconductor Components Industries, LLC, 2001 April, 2001 – Rev. 1 1 Publication Order Number: MAX1617/D MAX1617 FUNCTIONAL BLOCK DIAGRAM Internal Sensor (Diode) D+ D– Modulator Control Logic ALERT STBY Register Set Int. Temp Ext.Temp Status Byte Config. Byte Conv. Rate SCL SDA Ext. Hi Limit SMBus Interface Ext. Lo Limit Int. Hi Limit ADD 0 ADD 1 Int. Lo Limit ABSOLUTE MAXIMUM RATINGS* Rating Power Supply Voltage Symbol Value Unit VDD 6.0 V (GND – 0.3 V) to (VDD + 0.3 V) V °C Voltage on Any Pin Operating Temperature Range TA –55 to +125 Storage Temperature Range Tstg –65 to +150 °C –1.0 to +50 mA ±1.0 mA 330 mW SMBus Input/Output Current D– Input Current Maximum Power Dissipation PD * Maximum Ratings are those values beyond which damage to the device may occur. http://onsemi.com 2 MAX1617 PIN DESCRIPTION ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Pin No. Symbol Type Description 2 VDD Power 3 D+ Bi–Directional Current Source and A/D Positive Input 4 D– Bi–Directional Current Sink and A/D Negative Input 6, 10 ADD[1:0] Input Power Supply Input Address Select Pins (See Address Decode Table) 7, 8 GND Power System Ground 11 ALERT Output SMBus Interrupt (SMBALERT) or Comparator Output 12 SDA Bi–Directional SMBus Serial Data 14 SCL Input SMBus Serial Clock 15 STBY Input Standby Enable 1, 5, 9, 13, 16 NC – Not Connected PIN DESCRIPTION (NOTE: A pull–up resistor is necessary on ALERT since it is an open–drain output. Current sourced from the pull–up Input. SMBus serial clock. Clocks data into and out of the resistor causes power dissipation and may cause internal MAX1617. heating of the MAX1617. To avoid affecting the accuracy of SDA internal temperature readings, the pull–up resistors should Bi–directional. Serial data is transferred on the SMBus in be made as large as possible.) both directions using this pin. SCL STBY ADD1, ADD0 Inputs. Sets the 7–bit SMBus address. These pins are “tri–state,” and the SMBus addresses are specified in the Address Decode Table below. (NOTE: The tri–state scheme allows up to nine MAX1617s on a single bus. A match between the MAX1617’s address and the address specified in the serial bit stream must be made to initiate communication. Many SMBus–compatible devices with other addresses may share the same 2–wire bus. These pins are only active at power–on reset, and will latch into the appropriate states. Input. The activation of Standby mode may be achieved using either the STBY pin or the CHIP STOP bit (CONFIG register). If STBY is pulled low, the MAX1617 unconditionally enters its low–power Standby mode. The temperature–to–digital conversion process is halted, but ALERT remains functional. The MAX1617’s bus interface remains active, and all registers may be read from and written to normally. The INT_TEMP and EXT_TEMP registers will contain whatever data was valid at the time of Standby. (Transitions on SDA or SCL due to external bus activity may increase the Standby power consumption.) ALERT D+ Output, Open Collector, Active Low. The ALERT output corresponds to the general SMBALERT signal and indicates an interrupt event. The MAX1617 will respond to the standard SMBus Alert Response Address when ALERT is asserted. Normally, the ALERT output will be asserted when any of the following occurs: INT_TEMP equal to or exceeds INT_HLIM INT_TEMP falls below INT_LLIM EXT_TEMP equal to or exceeds EXT_HLIM EXT_TEMP falls below EXT_LLIM External Diode “Open” The operation of the ALERT output is controlled by the MASK1 bit in the CONFIG register. If the MASK1 bit is set to “1,” no interrupts will be generated on ALERT. The ALERT output is cleared and re–armed by the Alert Response Address (ARA). This output may be WIRE–ORed with similar outputs from other SMBus devices. If the alarm condition persists after the ARA, the ALERT output will be immediately re–asserted. Bi–directional. this pin connects to the anode of the external diode and is the positive A/D input. Current is injected into the external diode from the MAX1617, and the temperature proportional VBE is measured and converted to digital temperature data. D– Bi–directional. This pin connects to the cathode of the external diode. Current is sunk from the external diode into the MAX1617 through this pin. It also is the negative input terminal to the MAX1617’s A/D converter. This node is kept at approximately 0.7 V above GROUND. VDD Input. Power supply input. See electrical specifications. GND Input. Ground return for all MAX1617 functions. http://onsemi.com 3 MAX1617 DC ELECTRICAL CHARACTERISTICS (VDD = 3.3 V, –55°C ≤ TA ≤ 125°C, unless otherwise noted.) Characteristic Symbol Min Typ Max Unit VDD 3.0 – 5.5 V VUV–LOCK 2.4 2.80 2.95 V VPOR 1.0 1.7 2.3 V – – 70 – – 180 – 100 A Power Supply Power Supply Voltage VDD Undervoltage Lockout Threshold Power–On Reset Threshold (VDD Falling Edge) A Operating Current 0.25 Conv./Sec Rate SMBus Inactive (1) IDD Operating Current 2 Conv./Sec Rate SMBus Inactive (1) IDD Standby Supply Current (SMBus Active) IDD–STANDBY – Standby Supply Current (SMBus Inactive) IDD–STANDBY – – 10 A IADD–BIAS – 160 – A VOL – – 0.4 V ADD[1:0] Bias Current (Power–Up Only) A ALERT Output Output Low Voltage (IOL = 1.0 mA) (3) ADD[1:0] Inputs Logic Input Low VIL – – VDD x 0.3 V Logic Input High VIH VDD x 0.7 – – V STBY Input Logic Input Low VIL – – VDD x 0.3 V Logic Input High VIH VDD x 0.7 – – V Basic Temperature Resolution TRES – 1.0 – °C Internal Diode Temperature +60°C ≤ TA ≤ +100°C 0°C ≤ TA ≤ +125°C –55°C ≤ TA ≤ 0°C TIERR –2.0 –3.0 – – – ±3.0 +2.0 +3.0 – External Diode Temperature +60°C ≤ TA ≤ +100°C 0°C ≤ TA ≤ +125°C –55°C ≤ TA ≤ 0°C TEERR –3.0 –5.0 – – – ±5.0 +3.0 +5.0 – Temp–to–Bits Converter °C °C External Diode High Source Current (D+) – (D–) ~ 0.65 V IDIODE–HIGH – 100 – A External Diode Low Source Current (D+) – (D–) ~ 0.65 V IDIODE–LOW – 10 – A Source Voltage VD–SOURCE – 0.7 – V Conversion Time From CHIP STOP to Conv. Complete (2) tCONV 54 83 112 msec Conversion Rate Accuracy (See Conversion Rate Register Desc.) CR –35 – +35 % Logic Input High VIH 2.2 – – V Logic Input Low VIL – – 0.8 V SDA Output Low IOL = 2 mA (3) IOL = 4 mA (3) VOL – – – – 0.4 0.6 Input Capacitance SDA, SCL CIN – 5.0 – pF ILEAK –1.0 0.1 1.0 A 2–Wire SMBus Interface I/O Leakage V 1. Operating current is an average value (including external diode injection pulse current) integrated over multiple conversion cycles. Transient current may exceed this specification. 2. For true recurring conversion time see Conversion Rate register description. 3. Output current should be minimized for best temperature accuracy. Power dissipation within the MAX1617 will cause self–heating and temperature drift error. http://onsemi.com 4 MAX1617 SMBus PORT AC TIMING (VDD = 3.3 V, –55°C ≤ (TA = TJ) ≤ 125°C; CL = 80 pF, unless otherwise noted.) Characteristic Symbol Min Typ Max Unit SMBus Clock Frequency fSMB 10 – 100 kHz Low Clock Period (10% to 10%) tLOW 4.7 – – sec High Clock Period (90% to 90%) tHIGH 4.0 – – sec SMBus Rise Time (10% to 90%) tR – – 1,000 nsec SMBus Fall Time (90% to 10%) tF – – 300 nsec Start Condition Setup Time (90% SCL to 10% SDA) (for Repeated Start Condition) tSU(START) 4.0 – – sec Start Condition Hold Time tH(START) 4.0 – – sec Data in Setup Time tSU–DATA 1,000 – – nsec Data in Hold Time tH–DATA 1,250 – – nsec tSU(STOP) 4.0 – – sec tIDLE 4.7 – – sec Stop Condition Setup Time Bus Free Time Prior to New Transition SMBUS Write Timing Diagram A B ILOW C IHIGH D E F G H I J K L M SCL 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 t H–DATA F = Acknowledge Bit Clocked into Master G = MSB of Data Clocked into Slave H = LSB of Data Clocked into Slave I = Slave Pulls SDA Line Low t SU(STOP) t IDLE J = Acknowledge Clocked into Master K = Acknowledge Clock Pulse L = Stop Condition, Data Executed by Slave M= New Start Condition SMBUS Read Timing Diagram A B ILOW C IHIGH D E F G H I J K SCL 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 t SU(STOP) 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 http://onsemi.com 5 t IDLE I = Acknowledge Clock Pulse J = Stop Condition K = New Start Condition MAX1617 DETAILED OPERATING DESCRIPTION The MAX1617 acquires and converts temperature information from two separate sources, both silicon junction diodes, with a basic accuracy of ±1°C. One is located on the MAX1617 die; the other is connected externally. The external diode may be located on another IC die. The analog–to–digital converter on the MAX1617 alternately converts temperature data from the two sensors and stores them separately in internal registers. The system interface is a slave SMBus port with an ALERT (SMBALERT) interrupt output. The interrupt is triggered when one or more of four preset temperature thresholds are tripped (see Figure 1). These four thresholds are user–programmable via the SMBus port. Additionally, the temperature data can be read at any time through the SMBus port. Nine SMBus addresses are programmable for the MAX1617, which allows for a multi–sensor configuration. Also, there is low–power Standby mode where temperature acquisition is suspended. EXT_TEMP INT_TEMP TEMPERATURE EXT_HLIM ASSERT ALERT INT_HLIM One Shot? Operating Mode 0 Don’t Care Don’t Care Standby 1 0 Don’t Care Normal 1 1 No Standby 1 1 Yes Normal (1 Conversion Only, then Standby) INT_LLIM ALERT Note: This diagram implies that the appropriate setpoint is moved, temporarily, after each ALERT event to suppress re–assertion of ALERT immediately after the ARA/de–assertion. Figure 1. Temperature vs. Setpoint Event Generation SMBus SLAVE ADDRESS The two pins ADD1 and ADD0 are tri–state input pins which determine the 7–bit SMBus slave address of the MAX1617. The address is latched during POR. Address Decode Table ADD0 ADD1 SMBus Address 0 0 0011 000 0 open (3–state) 0011 001 0 1 0011 010 open (3–state) 0 0101 001 open (3–state) open (3–state) 0101 010 open (3–state) 1 0101 011 1 0 1001 100 1 open (3–state) 1001 101 1 1 1001 110 Standby Mode Operation Chip Stop Bit EXT_LLIM TIME STANDBY MODE The MAX1617 allows the host to put it into a low power (IDD = 10 µA, max) Standby mode. In this mode, the A/D converter is halted, and the temperature data registers are frozen. The SMBus port operates normally. Standby mode can be enabled with either the STBY input pin or the CHIP STOP bit in the CONFIG register. The following table summarizes this operation. STBY ASSERT ALERT ASSERT ALERT SETPOINTS ASSERT ALERT http://onsemi.com 6 MAX1617 POR*, initialize all registers STBY mode active? Monitor SMBus for START condition YES Stop conv., reset STATUS D[7] NO Start internal conversion STATUS [D7] YES YES One shot? YES YES NO NO READ Perform one conversion cycle NO NO YES EOC*? Execute SMBus write YES Update INT_TEMP NO WRITE Read/ Write? NO NO Start external conversion Execute SMBus read NO STBY released? STBY active? Execute Status read and clear STATUS STATUS read? Valid command? Address match? Thermal Trip? NO YES ARA*? YES YES STBY active? YES ALERT active ? NO Ext. diode open? YES ARA* bus arbitration? YES NO YES NO Rest period over? NO YES One Shot? NO EOC*? YES YES Disable and re–arm ALERT, send local address to host Update EXT_TEMP NO NO Rest Period according to CONV_RATE register Win arbitration? Thermal Trip? CONFIG [D7] active? YES YES NO Reset STATUS bit D[7] Set appropriate STATUS bit D[6:2] Enable ALERT# * POR = Power On Reset; ARA = Alert Response Address; EOC = End Of Conversion Figure 2. MAX1617 Functional Description Flowchart http://onsemi.com 7 MAX1617 Serial Port Operation Start Condition (START) The Serial Clock input (SCL) and bi–directional data port (SDA) form a 2–wire bi–directional serial port for programming and interrogating the MAX1617. The following conventions are used in this bus architecture. (See SMBus Write/Read Timing Diagram.) All transfers take place under control of a host, usually a CPU or microcontroller, acting as the Master, which provides the clock signal for all transfers. The MAX1617 always operates as a slave. The serial protocol is illustrated in Figure 3. All data transfers have two phases; all bytes are transferred MSB first. Accesses are initiated by a start condition (START), followed by a device address byte and one or more data bytes. The device address byte includes a Read/Write selection bit. Each access must be terminated by a Stop Condition (STOP). A convention called Acknowledge (ACK) confirms receipt of each byte. Note that SDA can change only during periods when SCL is LOW (SDA changes while SCL is High are reserved for Start and Stop conditions.) The MAX1617 continuously monitors the SDA and SCL lines for a start condition (a High to Low transition of SDA while SCL is High), and will not respond until this condition is met. (See SMBus Write/Read Timing Diagram.) Address Byte Immediately following the Start Condition, the host must transmit the address byte to the MAX1617. The states of ADD1 and ADD0 during power–up determine the 7–bit SMBus address for the MAX1617. The 7–bit address transmitted in the serial bit stream must match for the MAX1617 to respond with an Acknowledge (indicating the MAX1617 is on the bus and ready to accept data). The eighth bit in the Address Byte is a Read–Write Bit. This bit is 1 for a read operation or 0 for a write operation. Acknowledge (ACK) Acknowledge (ACK) provides a positive handshake between the host and the MAX1617. The host releases SDA after transmitting eight bits, then generates a ninth clock cycle to allow the MAX1617 to pull the SDA line Low to acknowledge that it successfully received the previous eight bits of data or address. MAX1617 Serial Bus Conventions Term Explanation Transmitter The device sending data to the bus. Receiver Data Byte The device receiving data from the bus. Master The device which controls the bus: initiating transfers (START), generating the clock, and terminating transfers (STOP). Slave The device addressed by the master. Start A unique condition signaling the beginning of a transfer indicated by SDA falling (High – Low) while SCL is high. Stop A unique condition signaling the end of a transfer indicated by SDA rising (Low – High) while SCL is high. ACK A receiver acknowledges the receipt of each byte with this unique condition. The receiver drives SDA low during SCL high of the ACK clock–pulse. The Master provides the clock pulse for the ACK cycle. Busy Communication is not possible because the bus is in use. NOT Busy When the bus is idle, both SDA and SCL will remain high. Data Valid The state of SDA must remain stable during the High period of SCL in order for a data bit to be considered valid. SDA only changes state while SCL is low during normal data transfers (see Start and Stop conditions). After a successful ACK of the address byte, the host must transmit the data byte to be written or clock out the data to be read. (See the appropriate timing diagrams.) ACK will be generated after a successful write of a data byte into the MAX1617. Stop Condition (STOP) Communications must be terminated by a stop condition (a Low to High transition of SDA while SCL is High). The Stop Condition must be communicated by the transmitter to the MAX1617. (See SMBus Write/Read Timing Diagram.) http://onsemi.com 8 MAX1617 Write Byte Format S ADDRESS 7 Bits WR ACK Slave Address Command Byte: selects which register you writing to. Read Byte Format S ADDRESS 7 Bits WR ACK Slave Address COMMAND 8 Bits ACK S Command Byte: selects which register you reading from. ADDRESS RD 7 Bits ADDRESS 7 Bits WR ACK DATA 8 Bits P Data Byte: data goes into the register set by the command byte. ACK Slave Address: repeated due to change in data– flow direction. Send Byte Format S ACK COMMAND 8 Bits DATA 8 Bits NACK P Data Byte: reads from the register set by the command byte. Receive Byte Format ACK S = Start Condition P = Stop Condition Shaded = Slave Transmission COMMAND 8 Bits ACK S P ADDRESS RD 7 Bits Command Byte: sends command with no data, usually used for one–shot command. REGISTER SET AND PROGRAMMER’S MODEL MAX1617 Command Set The MAX1617 supports four SMBus command protocols. These are READ_BYTE, WRITE_BYTE, SEND_BYTE, and RECEIVE_BYTE. See System Management Bus Specification Rev. 1.0 for details. Command Byte Description Code RIT 00h Read Internal Temp (INT_TEMP) RET 01h Read External Temp (EXT_TEMP) Function RS 02h Read Status Byte (STATUS) RC 03h Read Configuration Byte (CONFIG) RCR 04h Read Conversion Rate Byte (CONV_RATE) RIHL 05h Read Internal High Limit (INT_HLIM) RILL 06h Read Internal Low Limit (INT_LLIM) REHL 07h Read External High Limit (EXT_HLIM) RELL 08h Read External Low Limit (EXT_LLIM) WC 09h Write Configuration Byte (CONFIG) WCR 0Ah Write Conversion Rate Byt3 (CONV_RATE) WIHL 0Bh Write Internal High Limit (INT_HLIM) WILL 0Ch Write Internal Low Limit (INT_LLIM) WEHL 0Dh Write External High Limit (EXT_HLIM) WELL 0Eh Write External Low Limit (EXT_LLIM) OSHT 0Fh One Shot Temp Measurement RMID FEh Read Manufacturer ID (MFR_ID) RMREV FFh Read Manufacturer Revision Number (MFR_REV) DATA 8 Bits NACK P Data Byte: reads data from the register commanded by the last Read Byte. Figure 3. SMBus Protocols Command ACK NOTE: Proper device operation is NOT guaranteed if undefined locations (10h to FDh) are addressed. In case of erroneous SMBus operation (RECEIVE_BYTE command issued immediately after WRITE_BYTE command) the MAX1617 will ACKnowledge the address and return 1111 1111b to signify an error. Under no condition will it implement an SMBus “timeout.” http://onsemi.com 9 MAX1617 Configuration Register (Config), 8–Bits, Read/Write reading of 00000000b corresponds to 0°C. Examples of this temperature–to–binary value relationship are shown in the following table. Configuration Register (Config) D[7] D[6] Mask1 Chip Stop D[5] D[4] D[3] D[2] D[1] D[0] Temperature–to–Digital Value Conversion (INT_TEMP, EXT_TEMP, INT_HLIM, INT_LLIM,EXT_HLIM, EXT_LLIM) Reserved Bit POR State D[7] 0 Function Operation Interrupt Mask (see text) 1 = mask ALERT 0 = don’t mask ALERT Actual Temperature Rounded Temperature Binary Value Hex Value +130.00°C +127°C 01111111 7F +127°C 01111111 7F D[6] 0 Standby switch 1 = standby, 0 = normal +127.00°C +126.50°C +127°C 01111111 7F D[5]–D[0] 0 Reserved – Always returns zero when read. N/A +25.25°C +25°C 00011001 19 +0.50°C +1°C 00000001 01 +0.25°C 0°C 00000000 00 0.00°C 0°C 00000000 00 –0.25°C 0°C 00000000 00 –0.50°C 0°C 00000000 00 –0.75°C –1°C 11111111 FF A/D Conversion Rate Register (CONV_RATE), 8–Bits, Read/Write A/D Conversion Rate Register (CONV_RATE) D[7] D[6] D[5] D[4] D[3] Reserved Bit POR State D[7:3] 0 D[2:0] D[2] D[1] D[0] MSB X LSB Function Operation Reserved – Always returns zero when read. 010b Conversion rate bits. N/A See below. –1.00°C –1°C 11111111 FF –25.00°C –25°C 11100111 E7 –25.25°C –25°C 11100110 E7 –54.75°C –55°C 11001001 C9 –55.00°C –55°C 11001001 C9 –65.00°C –65°C 10111111 BF A/D Conversion Rate Selection D2 D1 D0 0 0 0 0.0625 0 0 1 0.125 0 1 0 0.25 0 1 1 0.5 1 0 0 1.0 1 0 1 2.0 1 1 0 4.0 Temperature Threshold Setpoint Registers, 8–Bits, Read–Write (INT_HLIM, INT_LLIM, EXT_HLIM, EXT_LLIM) These registers store the values of the upper and lower temperature setpoints for event detection. The value is in 2’s–complement binary. INT_HLIM and INT_LLIM are compared with the INT_TEMP value, and EXT_HLIM and EXT_LLIM are compared with EXT_TEMP. These registers may be written at any time. 1 1 1 8.0 Internal High Limit Setpoint Register (INT_HLIM) Conversion Rate Samples/sec NOTE: Conversion rate denotes actual sampling of both internal and external sensors. D[6] D[5] D[4] D[3] D[2] D[1] D[0] x x x x x x LSB D[6] D[5] D[4] D[3] D[2] D[1] D[0] MSB x x x x x x LSB D[4] D[3] D[2] D[1] D[0] x x x x x LSB D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] MSB x x x x x x LS D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] MSB x x x x x x LSB External Low Limit Setpoint Register (EXT_LLIM) External Temperature Register (EXT_TEMP) D[7] D[5] x External High Limit Setpoint Register (EXT_HLIM) Internal Temperature Register (INT_TEMP) D[7] D[6] Internal Low Limit Setpoint Register (INT_LLIM) Temperature Registers, 8–Bits, Read–Only (INT_TEMP, EXT_TEMP) The binary value (2’s complement format) in these two registers represents temperature of the internal and external sensors following a conversion cycle. The registers are automatically updated in an alternating manner. MSB D[7] MSB D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] MSB x x x x x x LSB NOTE: POR states: INT_HLIM INT_LLIM EXT_HLIM EXT_LLIM In the two temperature data and four threshold setpoint registers, each unit value represents one degree (Celsius). The value is in 2’s–complement binary format such that a http://onsemi.com 10 01111111b 11001001b 01111111b 11001001b +127°C –55°C +127°C –55°C MAX1617 Status Register (Status) D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] Busy Flag1 Flag2 Flag3 Flag4 Flag5 Flag6 Reserved Bit(s) POR State D[7] 0 Function Operation* Signal A/D converter is busy. 1 = A/D busy, 0 = A/D idle 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[6] 0 Interrupt flag for INT_HLIM event 1 = interrupt occurred, 0 = none D[5] 0 Interrupt flag for INT_LLIM event 1 = interrupt occurred, 0 = none D[4] 0 Interrupt flag for EXT_HLIM event 1 = interrupt occurred, 0 = none D[3] 0 Interrupt flag for EXT_LLIM event 1 = interrupt occurred, 0 = none D[2] 0 External diode “fault” flag 1 = external diode fault 0 = external diode OK D[1:0] 0 Reserved – Always returns zero. N/A D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] MSB X X X X X X LSB 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. 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 INT_TEMP EXT_TEMP Internal sensor temperature (2’s complement) 0000 0000b* √ 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 Write √*** *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 MAX1617 PACKAGE DIMENSIONS 16–Pin QSOP PLASTIC PACKAGE CASE TBD ISSUE TBD PIN 1 .157 (3.99) .244 (6.20) .150 (3.81) .228 (5.80) .197 (4.98) .189 (4.80) .010 (0.25) .004 (0.10) .069 (1.75) .053 (1.35) .025 (0.635) TYP. 8° MAX. .012 (0.31) .008 (0.21) .010 (0.25) .007 (0.19) .050 (1.27) .016 (0.41) Dimensions: inches (mm) ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. 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