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MAX6694TE9A+TG24

MAX6694TE9A+TG24

  • 厂商:

    AD(亚德诺)

  • 封装:

    WQFN16

  • 描述:

    INTEGRATED CIRCUIT

  • 数据手册
  • 价格&库存
MAX6694TE9A+TG24 数据手册
19-4097; Rev 0; 4/08 5-Channel Precision Temperature Monitor with Beta Compensation The MAX6694 precision multichannel temperature sensor monitors its own temperature and the temperatures of up to four external diode-connected transistors. All temperature channels have programmable alert thresholds. Channels 1 and 4 also have programmable overtemperature thresholds. When the measured temperature of a channel exceeds the respective threshold, a status bit is set in one of the status registers. Two open-drain outputs, OVERT and ALERT, assert corresponding to these bits in the status register. The 2-wire serial interface supports the standard system management bus (SMBus™) protocols: write byte, read byte, send byte, and receive byte for reading the temperature data and programming the alarm thresholds. The MAX6694 is specified for a -40°C to +125°C operating temperature range and is available in 16-pin TSSOP and 5mm x 5mm thin QFN packages. Features o Four Thermal-Diode Inputs o Beta Compensation (Channel 1) o Local Temperature Sensor o 1.5°C Remote Temperature Accuracy (+60°C to +100°C) o Temperature Monitoring Begins at POR for FailSafe System Protection o ALERT and OVERT Outputs for Interrupts, Throttling, and Shutdown o STBY Input for Hardware Standby Mode o Small, 16-Pin TSSOP and TQFN Packages o 2-Wire SMBus Interface Applications Ordering Information Desktop Computers Notebook Computers PART TEMP RANGE MAX6694UE9A+ -40°C to +125°C PIN-PACKAGE MAX6694TE9A+ -40°C to +125°C +Denotes a lead-free package. *EP = Exposed pad. Note: Slave address is 1001 101. Workstations Servers SMBus is a trademark of Intel Corp. 16 TSSOP 16 TQFN-EP* Pin Configurations appear at end of data sheet. Typical Application Circuit +3.3V CPU 1 DXP1 GND 16 4.7kΩ EACH 2 DXN1 SMBCLK 15 CLK 3 DXP2 MAX6694 SMBDATA 14 4 DXN2 ALERT 13 5 DXP3 VCC 12 6 DXN3 OVERT 11 7 DXP4 N.C. 10 8 DXN4 100pF DATA 100pF INTERRUPT TO µP 0.1µF 100pF TO SYSTEM SHUTDOWN 100pF STBY 9 ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX6694 General Description MAX6694 5-Channel Precision Temperature Monitor with Beta Compensation ABSOLUTE MAXIMUM RATINGS VCC, SMBCLK, SMBDATA, ALERT, OVERT, STBY to GND ....................................................-0.3V to +6.0V DXP_ to GND..............................................-0.3V to (VCC + 0.3V) DXN_ to GND ........................................................-0.3V to +0.8V SMBDATA, ALERT, OVERT Current....................-1mA to +50mA DXIV_ Current .....................................................................±1mA Continuous Power Dissipation (TA = +70°C) 16-Pin TQFN, 5mm x 5mm (derate 33.3mW/°C above +70°C)............................2666.7mW 16-Pin TSSOP (derate 11.1mW/°C above +70°C) ............................888.9mW Junction-to-Case Thermal Resistance (θJC) (Note 1) 16-Pin TQFN...................................................................2°C/W 16-Pin TSSOP...............................................................27°C/W Junction-to-Ambient Thermal Resistance (θJA) (Note 1) 16-Pin TQFN.................................................................30°C/W 16-Pin TSSOP...............................................................90°C/W ESD Protection (all pins, Human Body Model) ....................±2kV Operating Temperature Range .........................-40°C to +125°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. 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 (VCC = +3.0V to +3.6V, VSTBY = VCC, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) (Note 2) PARAMETER Supply Voltage SYMBOL CONDITIONS VCC MIN TYP 3.0 MAX UNITS 3.6 V Software Standby Supply Current ISS SMBus static 3 10 µA Operating Current ICC During conversion (Note 3) 500 2000 µA Channel 1 only 11 Other diode channels 8 Temperature Resolution 3 σ Temperature Accuracy (Remote Channel 1) VCC = 3.3V, TA = TRJ = +60°C to +100°C ß = 0.5 TA = TRJ = 0°C to +125°C TA = TRJ = +60°C to +100°C VCC = 3.3V TA = TRJ = 0°C to +125°C 3 σ Temperature Accuracy (Remote Channels 2–6) 3 σ Temperature Accuracy (Local) VCC = 3.3V 6 σ Temperature Accuracy (Remote Channel 1) VCC = 3.3V, TA = TRJ = +60°C to +100°C ß = 0.5 TA = TRJ = 0°C to +125°C 6 σ Temperature Accuracy (Remote Channels 2–6) VCC = 3.3V 6 σ Temperature Accuracy (Local) VCC = 3.3V TA = +60°C to +100°C TA = 0°C to +125°C TA = TRJ = +60°C to +100°C Bits -1.5 +1.5 -2.375 +2.375 -2 +2 -2.5 +2.5 -2 +2 -2.5 +2.5 -3 +3 -4 +4 -3 +3 TA = TRJ = 0°C to +125°C -3.5 +3.5 TA = +60°C to +100°C -2.5 +2.5 -3 +3 TA = 0°C to +125°C Supply Sensitivity of Temperature Accuracy ±0.2 °C °C °C °C °C °C o C/V Remote Channel 1 Conversion Time tCONV1 190 250 312 ms Remote Channels 2, 3, 4 Conversion Time tCONV_ 95 125 156 ms 2 _______________________________________________________________________________________ 5-Channel Precision Temperature Monitor with Beta Compensation (VCC = +3.0V to +3.6V, VSTBY = VCC, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN High level, channel 1 Remote-Diode Source Current Undervoltage-Lockout Threshold IRJ UVLO TYP MAX Low level, channel 1 20 High level, channels 2, 3, 4 80 100 120 Low level, channels 2, 3, 4 8 10 12 2.30 2.80 2.95 Falling edge of VCC disables ADC Undervoltage-Lockout Hysteresis 90 Power-On-Reset (POR) Threshold VCC falling edge UNITS 500 1.2 POR Threshold Hysteresis 2.0 µA V mV 2.25 90 V mV ALERT, OVERT Output Low Voltage VOL ISINK = 1mA 0.3 ISINK = 6mA 0.5 Output Leakage Current 1 V µA SMBus INTERFACE (SMBCLK, SMBDATA), STBY Logic Input Low Voltage VIL Logic Input High Voltage VIH 0.8 VCC = 3.0V Input Leakage Current 2.2 -1 Output Low Voltage VOL Input Capacitance CIN V V +1 ISINK = 6mA 0.3 5 µA V pF SMBus-COMPATIBLE TIMING (Figures 3 and 4) (Note 4) Serial-Clock Frequency Bus Free Time Between STOP and START Condition fSMBCLK tBUF START Condition Setup Time Repeat START Condition Setup Time tSU:STA START Condition Hold Time tHD:STA STOP Condition Setup Time tSU:STO Clock Low Period tLOW Clock High Period tHIGH Data Hold Time tHD:DAT (Note 5) 400 fSMBCLK = 100kHz 4.7 fSMBCLK = 400kHz 1.6 fSMBCLK = 100kHz 4.7 fSMBCLK = 400kHz 0.6 90% of SMBCLK to 90% of SMBDATA, fSMBCLK = 100kHz 0.6 90% of SMBCLK to 90% of SMBDATA, fSMBCLK = 400kHz 0.6 10% of SMBDATA to 90% of SMBCLK 0.6 90% of SMBCLK to 90% of SMBDATA, fSMBCLK = 100kHz 4 90% of SMBCLK to 90% of SMBDATA, fSMBCLK = 400kHz 0.6 10% to 10%, fSMBCLK = 100kHz 1.3 10% to 10%, fSMBCLK = 400kHz 1.3 µs µs µs µs µs 90% to 90% 0.6 fSMBCLK = 100kHz 300 fSMBCLK = 400kHz (Note 6) kHz µs µs 900 ns _______________________________________________________________________________________ 3 MAX6694 ELECTRICAL CHARACTERISTICS (continued) MAX6694 5-Channel Precision Temperature Monitor with Beta Compensation ELECTRICAL CHARACTERISTICS (continued) (VCC = +3.0V to +3.6V, VSTBY = VCC, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) (Note 1) PARAMETER Data Setup Time SYMBOL tSU:DAT Receive SMBCLK/SMBDATA Rise Time tR Receive SMBCLK/SMBDATA Fall Time tF Pulse Width of Spike Suppressed SMBus Timeout Note 2: Note 3: Note 4: Note 5: Note 6: 4 CONDITIONS fSMBCLK = 100kHz 250 fSMBCLK = 400kHz 100 TYP MAX 1 fSMBCLK = 400kHz 0.3 300 0 SMBDATA low period for interface reset 25 UNITS ns fSMBCLK = 100kHz tSP tTIMEOUT MIN 37 µs ns 50 ns 45 ms All parameters are tested at TA = +85°C. Specifications over temperature are guaranteed by design. Beta = 0.5 for channel 1 remote transistor. Timing specifications are guaranteed by design. The serial interface resets when SMBCLK is low for more than tTIMEOUT. A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SMBCLK’s falling edge. _______________________________________________________________________________________ 5-Channel Precision Temperature Monitor with Beta Compensation SOFTWARE STANDBY SUPPLY CURRENT vs. SUPPLY VOLTAGE 3.5 3.4 3.3 550 500 450 3.2 MAX6694 toc03 2 CHANNEL 2 1 0 -1 -2 CHANNEL 1 -4 -5 350 3.2 3.3 3.4 3.5 3.6 3.0 3.2 3.4 SUPPLY VOLTAGE (V) LOCAL TEMPERATURE ERROR vs. DIE TEMPERATURE REMOTE-DIODE TEMPERATURE ERROR vs. POWER-SUPPLY NOISE FREQUENCY 2 1 0 -1 3 2 CHANNEL 2 1 0 -1 -2 -3 0 25 50 75 100 125 CHANNEL 1 0.010 0.100 1.000 10.000 -2 0 -1 -2 3 2 1 0 -1 -2 2 1 0 -1 -2 -4 -4 -5 -5 -5 10.0 10.000 3 -4 1.0 1.000 4 -3 FREQUENCY (MHz) 0.100 5 -3 0.1 0.010 CH 2 REMOTE-DIODE TEMPERATURE ERROR vs. CAPACITANCE TEMPERATURE ERROR (°C) -1 1 FREQUENCY (MHz) MAX6694 toc08 4 TEMPERATURE ERROR (°C) 0 2 -4 5 MAX6694 toc07 1 3 -5 0.001 CH 1 REMOTE-DIODE TEMPERATURE ERROR vs. CAPACITANCE 2 100mVP-P -5 0.001 CH 2 REMOTE-DIODE TEMPERATURE ERROR vs. COMMON-MODE NOISE FREQUENCY 3 125 -3 FREQUENCY (MHz) 100mVP-P 100 4 -4 DIE TEMPERATURE (°C) 4 75 5 -3 -2 50 LOCAL TEMPERATURE ERROR vs. POWER-SUPPLY NOISE FREQUENCY TEMPERATURE ERROR (°C) TEMPERATURE ERROR (°C) 3 100mVP-P 4 25 TEMPERATURE (°C) 5 MAX6694 toc04 4 0 3.6 SUPPLY VOLTAGE (V) MAX6694 toc06 3.1 MAX6694 toc05 3.0 MAX6694 toc09 3.0 TEMPERATURE ERROR (°C) 3 -3 400 3.1 TEMPERATURE ERROR (°C) 4 TEMPERATURE ERROR (°C) SUPPLY CURRENT (µA) 3.6 LOW BETA DIODE CONNECTED TO CHANNEL 1 WITH RESISTANCE CANCELLATION AND LOW BETA 600 5 MAX6694 toc02 3.7 SUPPLY CURRENT (µA) 650 MAX6694 toc01 3.8 REMOTE-DIODE TEMPERATURE ERROR vs. REMOTE-DIODE TEMPERATURE SUPPLY CURRENT vs. SUPPLY VOLTAGE -3 1 10 CAPACITANCE (nF) 100 1 10 100 CAPACITANCE (nF) _______________________________________________________________________________________ 5 MAX6694 Typical Operating Characteristics (VCC = 3.3V, VSTBY = VCC, TA = +25°C, unless otherwise noted.) 5-Channel Precision Temperature Monitor with Beta Compensation MAX6694 Pin Description PIN TSSOP 6 TQFN-EP NAME FUNCTION 1 15 DXP1 Combined Current Source and A/D Positive Input for Channel 1 Remote Transistor. Connect to the emitter of a low beta transistor. Leave unconnected or connect to VCC if no remote transistor is used. Place a 100pF capacitor between DXP1 and DXN1 for noise filtering. 2 16 DXN1 Base Input for Channel 1 Remote Diode. Connect to the base of a pnp temperaturesensing transistor. 3 1 DXP2 Combined Current Source and A/D Positive Input for Channel 2 Remote Diode. Connect to the anode of a remote-diode-connected temperature-sensing transistor. Leave unconnected or connect to VCC if no remote diode is used. Place a 100pF capacitor between DXP2 and DXN2 for noise filtering. 4 2 DXN2 Cathode Input for Channel 2 Remote Diode. Connect the cathode of the channel 2 remote-diode-connected transistor to DXN2. 5 3 DXP3 Combined Current Source and A/D Positive Input for Channel 3 Remote Diode. Connect to the anode of a remote-diode-connected temperature-sensing transistor. Leave unconnected or connect to VCC if no remote diode is used. Place a 100pF capacitor between DXP3 and DXN3 for noise filtering. 6 4 DXN3 Cathode Input for Channel 3 Remote Diode. Connect the cathode of the channel 3 remote-diode-connected transistor to DXN3. 7 5 DXP4 Combined Current Source and A/D Positive Input for Channel 4 Remote Diode. Connect to the anode of a remote-diode-connected temperature-sensing transistor. Leave unconnected or connect to VCC if no remote diode is used. Place a 100pF capacitor between DXP4 and DXN4 for noise filtering. 8 6 DXN4 Cathode Input for Channel 4 Remote Diode. Connect the cathode of the channel 4 remote-diode-connected transistor to DXN4. 9 7 STBY Active-Low Standby Input. Drive STBY low to place the MAX6694 in standby mode, or high for operate mode. Temperature and threshold data are retained in standby mode. 10 8 N.C. 11 9 OVERT 12 10 VCC 13 11 ALERT 14 12 SMBDATA 15 13 SMBCLK 16 14 GND — — EP No Connection. Must be connected to ground. Overtemperature Active-Low, Open-Drain Output. OVERT asserts low when the temperature of channels 1 and 4 exceeds the programmed threshold limit. Supply Voltage Input. Bypass to GND with a 0.1µF capacitor. SMBus Alert (Interrupt), Active-Low, Open-Drain Output. ALERT asserts low when the temperature of any channel exceeds the programmed ALERT threshold. SMBus Serial Data Input/Output. Connect to a pullup resistor. SMBus Serial Clock Input. Connect to a pullup resistor. Ground Exposed Pad. Connect to a large ground plane to maximize thermal performance. Not intended as an electrical connection point. (TQFN package only). _______________________________________________________________________________________ 5-Channel Precision Temperature Monitor with Beta Compensation The MAX6694 is a precision multichannel temperature monitor that features one local and four remote temperature-sensing channels with a programmable alert threshold for each temperature channel and a programmable overtemperature threshold for channels 1 and 4 (see Figure 1). Communication with the MAX6694 is achieved through the SMBus serial interface and a dedicated alert output. The alarm outputs, OVERT and ALERT, assert if the software-programmed temperature thresholds are exceeded. ALERT typically serves as an interrupt, while OVERT can be connected to a fan, system shutdown, or other thermal-management circuitry. ADC Conversion Sequence In the default conversion mode, the MAX6694 starts the conversion sequence by measuring the temperature on channel 1, followed by 2, 3, local channel, and 4. The conversion result for each active channel is stored in the corresponding temperature data register. Low-Power Standby Mode Enter software standby mode by setting the STOP bit to 1 in the configuration 1 register. Enter hardware standby by pulling STBY low. Software standby mode disables the ADC and reduces the supply current to approximately 3µA. Hardware standby mode halts the ADC clock, but the supply current is approximately VCC MAX6694 DXP1 ALARM ALU DXN1 DXP2 DXN2 DXP3 CURRENT SOURCES, BETA COMPENSATION AND MUX INPUT BUFFER ADC OVERT ALERT REGISTER BANK COMMAND BYTE REMOTE TEMPERATURES DXN3 DXP4 LOCAL TEMPERATURES REF ALERT THRESHOLD OVERT THRESHOLD DXN4 ALERT RESPONSE ADDRESS SMBus INTERFACE STBY SMBCLK SMBDATA Figure 1. Internal Block Diagram _______________________________________________________________________________________ 7 MAX6694 Detailed Description MAX6694 5-Channel Precision Temperature Monitor with Beta Compensation SMBus Digital Interface 350µA. During either software or hardware standby, data is retained in memory. During hardware standby, the SMBus interface is inactive. During software standby, the SMBus interface is active and listening for SMBus commands. The timeout is enabled if a start condition is recognized on SMBus. Activity on the SMBus causes the supply current to increase. If a standby command is received while a conversion is in progress, the conversion cycle is interrupted, and the temperature registers are not updated. The previous data is not changed and remains available. From a software perspective, the MAX6694 appears as a series of 8-bit registers that contain temperature measurement data, alarm threshold values, and control bits. A standard SMBus-compatible, 2-wire serial interface is used to read temperature data and write control bits and alarm threshold data. The same SMBus slave address also provides access to all functions. The MAX6694 employs four standard SMBus protocols: write byte, read byte, send byte, and receive byte (Figure 2). The shorter receive byte protocol allows quicker transfers, provided that the correct data register was previously selected by a read byte instruction. Use caution with the shorter protocols in multimaster systems, since a second master could overwrite the command byte without informing the first master. Figure 3 is the SMBus write-timing diagram and Figure 4 is the SMBus read-timing diagram. The remote diode 1 measurement channel provides 11 bits of data (1 LSB = +0.125°C). All other temperaturemeasurement channels provide 8 bits of temperature data (1 LSB = +1°C). The 8 most significant bits (MSBs) Operating-Current Calculation The MAX6694 operates at different operating-current levels depending on how many external channels are in use. Assume that ICC1 is the operating current when the MAX6694 is converting the remote channel 1 and ICC2 is the operating current when the MAX6694 is converting the other channels. For the MAX6694 with remote channel 1 and n other remote channels connected, the operating current is: ICC = (2 x ICC1 + ICC2 + n x ICC2)/(n + 3) WRITE BYTE FORMAT S ADDRESS WR ACK COMMAND 7 BITS ACK DATA 8 BITS SLAVE ADDRESS: EQUIVALENT TO CHIP-SELECT LINE OF A 3-WIRE INTERFACE ACK P 8 BITS 1 DATA BYTE: DATA GOES INTO THE REGISTER SET BY THE COMMAND BYTE (TO SET THRESHOLDS, CONFIGURATION MASKS, AND SAMPLING RATE) COMMAND BYTE: SELECTS TO WHICH REGISTER YOU ARE WRITING READ BYTE FORMAT S ADDRESS WR ACK 7 BITS COMMAND ACK S SLAVE ADDRESS: EQUIVALENT TO CHIP SELECT LINE ADDRESS ACK COMMAND BYTE: SELECTS FROM WHICH REGISTER YOU ARE READING DATA ACK 7 BITS COMMAND ACK 8 BITS COMMAND BYTE: SENDS COMMAND WITH NO DATA, USUALLY USED FOR ONE-SHOT COMMAND SLAVE ADDRESS: REPEATED DUE TO CHANGE IN DATAFLOW DIRECTION P DATA BYTE: READS FROM THE REGISTER SET BY THE COMMAND BYTE SHADED = SLAVE TRANSMISSION. /// = NOT ACKNOWLEDGED. P S ADDRESS 7 BITS RD ACK DATA /// 8 BITS DATA BYTE: READS DATA FROM THE REGISTER COMMANDED BY THE LAST READ BYTE OR WRITE BYTE TRANSMISSION; ALSO USED FOR SMBus ALERT RESPONSE RETURN ADDRESS Figure 2. SMBus Protocols 8 /// 8 BITS RECEIVE BYTE FORMAT WR S = START CONDITION. P = STOP CONDITION. RD 7 BITS SEND BYTE FORMAT S ADDRESS 8 BITS _______________________________________________________________________________________ P 5-Channel Precision Temperature Monitor with Beta Compensation tLOW B C tHIGH E D F G I H J K MAX6694 A M L SMBCLK SMBDATA tSU:STA tHD:STA tSU:DAT 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 SMBDATA LINE LOW. tHD:DAT tSU:STO tBUF J = ACKNOWLEDGE CLOCKED INTO SLAVE. K = ACKNOWLEDGE CLOCK PULSE. L = STOP CONDITION. M = NEW START CONDITION. F = ACKNOWLEDGE BIT CLOCKED INTO MASTER. G = MSB OF DATA CLOCKED INTO MASTER. H = LSB OF DATA CLOCKED INTO MASTER. I = MASTER PULLS DATA LINE LOW. Figure 3. SMBus Write-Timing Diagram A B tLOW C D E F G H tHIGH I J K L M SMBCLK SMBDATA tSU:STA tHD:STA tSU:STO tSU:DAT 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 SMBDATA LINE LOW. F = ACKNOWLEDGE BIT CLOCKED INTO MASTER. G = MSB OF DATA CLOCKE D INTO SLAVE. H = LSB OF DATA CLOCKED INTO SLAVE. tBUF I = MASTER PULLS DATA LINE LOW. J = ACKNOWLEDGE CLOCKED INTO SLAVE. K = ACKNOWLEDGE CLOCK PULSE. L = STOP CONDITION. M = NEW START CONDITION. Figure 4. SMBus Read-Timing Diagram Table 1. Main Temperature Register (High Byte) Data Format TEMP (°C) DIGITAL OUTPUT > +127 +127 +126 Table 2. Extended Resolution Temperature Register (Low Byte) Data Format TEMP (°C) DIGITAL OUTPUT 0111 1111 0 000X XXXX 0111 1111 +0.125 001X XXXX 0111 1110 +0.250 010X XXXX +25 0001 1001 +0.375 011X XXXX 0 0000 0000 +0.500 100X XXXX
MAX6694TE9A+TG24 价格&库存

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