Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsMAX6697EP9C+

General Description

The MAX6697 precision multichannel temperature sen-

sor monitors its own temperature and the temperatures

of up to six external diode-connected transistors. All

temperature channels have programmable alert thresh-

olds. Channels 1, 4, 5, and 6 also have programmable

overtemperature thresholds. When the measured tem-

perature of a channel exceeds the respective thresh-

old, a status bit is set in one of the status registers. Two

open-drain outputs, OVERT and ALERT, assert corre-

sponding 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 tem-

perature data and programming the alarm thresholds.

The MAX6697 is specified for an operating temperature

range of -40°C to +125°C and is available in 20-pin

QSOP and 20-pin TSSOP packages.

Applications

Desktop Computers

Notebook Computers

Workstations

Servers

Features

♦ Six Thermal-Diode Inputs

♦ Local Temperature Sensor

♦ 1°C Remote Temperature Accuracy (+60°C to

+100°C)

♦ Temperature Monitoring Begins at POR for Fail-

Safe System Protection

♦ ALERT and OVERT Outputs for Interrupts,

Throttling, and Shutdown

♦ Small 20-Pin QSOP and 20-Pin TSSOP Packages

♦ 2-Wire SMBus Interface

MAX6697

7-Channel Precision Temperature Monitor

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

GND

SMBCLK

SMBDATA

DXN2

DXP2

DXN1

DXP1

NC1

NC2DXN4

DXP4

DXN3

DXP3

DXP6

DXN6DXN5

DXP5

MAX6697

ALERT

OVERT

2200pF

CPU

DXP

DXN

GPU

2200pF

DXN

DXP

0.1μF

TO SYSTEM

SHUTDOWN

INTERRUPT

TO μP

DATA

CLK

4.7kΩ

EACH

+3.3V

Typical Application Circuit

19-3477; Rev 3; 5/09

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.

PART TEMP RANGE PIN-PACKAGE

MAX6697EP_ _ -40°C to +125°C

20 QSOP

MAX6697UP_ _ -40°C to +125°C

20 TSSOP

SMBus is a trademark of Intel Corp.

*See the Slave Address section.

Pin Configuration appears at end of data sheet.

Summary of content (18 pages)

PAGE 1
9-3477; Rev 3; 5/09 7-Channel Precision Temperature Monitor The MAX6697 precision multichannel temperature sensor monitors its own temperature and the temperatures of up to six external diode-connected transistors. All temperature channels have programmable alert thresholds. Channels 1, 4, 5, and 6 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.
PAGE 2
MAX6697 7-Channel Precision Temperature Monitor ABSOLUTE MAXIMUM RATINGS VCC, SCK, SDA, ALERT, OVERT to GND ................-0.3V to +6V DXP_ to GND..............................................-0.3V to (VCC + 0.3V) DXN_ to GND ........................................................-0.3V to +0.8V SDA, ALERT, OVERT Current .............................-1mA to +50mA DXN Current .......................................................................
PAGE 3
7-Channel Precision Temperature Monitor (VCC = +3.0V to +5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SMBus INTERFACE (SCL, SDA) Logic-Input Low Voltage Logic-Input High Voltage VIL VIH 0.8 VCC = 3.0V 2.2 VCC = 5.0V 2.4 Input Leakage Current V -1 Output Low Voltage VOL Input Capacitance CIN V V ISINK = 6mA +1 µA 0.
PAGE 4
Typical Operating Characteristics (VCC = 3.3V, TA = +25°C, unless otherwise noted.) STANDBY SUPPLY CURRENT vs. SUPPLY VOLTAGE REMOTE TEMPERATURE ERROR vs. REMOTE-DIODE TEMPERATURE SUPPLY CURRENT vs. SUPPLY VOLTAGE 7 6 5 4 3 2 1 0 2 TEMPERATURE ERROR (°C) SUPPLY CURRENT (μA) 355 8 3 350 345 340 335 330 4.8 3.3 5.3 3.8 SUPPLY VOLTAGE (V) 4.3 4.8 5.3 2 1 0 -1 -2 5 75 3 2 1 0 -1 -2 -3 -4 -4 -5 50 75 100 0.1 125 1 FREQUENCY (MHz) LOCAL TEMPERATURE ERROR vs.
PAGE 5
7-Channel Precision Temperature Monitor REMOTE TEMPERATURE ERROR vs. COMMON-MODE NOISE FREQUENCY 0 3 2 1 0 -1 -2 -3 MAX6697 toc09 100mVP-P -0.5 TEMPERATURE ERROR (°C) TEMPERATURE ERROR (°C) 4 MAX6697 toc08 5 TEMPERATURE ERROR vs. DXP-DXN CAPACITANCE -1.0 -1.5 -2.0 -2.5 -3.0 -3.5 -4.0 -4 -4.5 -5 0.001 -5.0 0.01 0.
PAGE 6
7-Channel Precision Temperature Monitor MAX6697 Pin Description (continued) PIN NAME FUNCTION 9 DXP5 Combined Current Source and A/D Positive Input for Channel 5 Remote Diode. Connect to the anode of a remote-diode-connected temperature-sensing transistor. Leave floating or connect to VCC if no remote diode is used. Place a 2200pF capacitor between DXP5 and DXN5 for noise filtering. 10 DXN5 Cathode Input for Channel 5 Remote Diode.
PAGE 7
-Channel Precision Temperature Monitor MAX6697 VCC DXP1 MAX6697 ADC DXN1 DXP2 10/100μA ALARM ALU DXN2 OVERT AVERT DXP3 DXN3 COUNT INPUT BUFFER DXP4 REGISTER BANK COMMAND BYTE COUNTER REMOTE TEMPERATURES DXN4 LOCAL TEMPERATURES REF DXP5 ALERT THRESHOLD OVERT THRESHOLD DXN5 ALERT RESPONSE ADDRESS DXP6 SMBus INTERFACE DXN6 SCL SDA Figure 1.
PAGE 8
MAX6697 7-Channel Precision Temperature Monitor Write Byte Format S ADDRESS WR ACK COMMAND 7 bits ADDRESS WR ACK 7 bits COMMAND ACK Command Byte: selects which register you are reading from S 1 ADDRESS RD ACK DATA /// P 8 bits Slave Address: repeated due to change in dataflow direction Data Byte: reads from the register set by the command byte Receive Byte Format WR 7 bits ACK COMMAND ACK P 8 bits S ADDRESS 7 bits RD ACK DATA /// P 8 bits Data Byte: reads data from th
PAGE 9
7-Channel Precision Temperature Monitor B tLOW C D E F G H tHIGH I J K L MAX6697 A 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 CLOCKED INTO SLAVE H = LSB OF DATA CLOCKED INTO SLAVE tBUF I = MASTER PULLS DATA LINE LOW J = ACKNOWLEDGE CLOCKED INTO SLAVE K = ACKNOWLEDGE
PAGE 10
MAX6697 7-Channel Precision Temperature Monitor can share a common interrupt line. All ALERT interrupts can be masked using the configuration 3 register. The POR state of these registers is shown in Table 1. ALERT Response Address The SMBus alert response interrupt pointer provides quick fault identification for simple slave devices that lack the complex logic needed to be a bus master.
PAGE 11
7-Channel Precision Temperature Monitor MAX6697 Table 3.
PAGE 12
MAX6697 7-Channel Precision Temperature Monitor Table 4. Configuration 1 Register BIT NAME POR STATE 7(MSB) STOP 0 Standby Mode Control Bit. If STOP is set to logic 1, the MAX6697 stops converting and enters standby mode. 6 POR 0 Reset Bit. Set to logic 1 to put the device into its power-on state. This bit is selfclearing. 5 TIMEOUT 0 Timeout Enable Bit. Set to logic 0 to enable SMBus timeout. 4 Fast remote 1 0 Channel 1 Fast Conversion Bit.
PAGE 13
7-Channel Precision Temperature Monitor MAX6697 Table 6. Configuration 3 Register BIT NAME POR STATE FUNCTION 7(MSB) Reserved 0 — 6 Reserved 0 — 5 Mask OVERT 6 0 Channel 6 Remote-Diode OVERT Mask Bit. Set to logic 1 to mask channel 6 OVERT. 4 Mask OVERT 5 0 Channel 5 Remote-Diode OVERT Mask Bit. Set to logic 1 to mask channel 5 OVERT. 3 Mask OVERT 4 0 Channel 4 Remote-Diode OVERT Mask Bit. Set to logic 1 to mask channel 4 OVERT.
PAGE 14
MAX6697 7-Channel Precision Temperature Monitor Table 7. Status 1 Register BIT NAME POR STATE 7(MSB) Reserved 0 — 6 Local ALERT 0 Local Channel High-Alert Bit. This bit is set to logic 1 when the local temperature exceeds the temperature threshold limit in the local ALERT highlimit register. 5 Remote 6 ALERT 0 Channel 6 Remote-Diode High-Alert Bit.
PAGE 15
7-Channel Precision Temperature Monitor BIT NAME POR STATE FUNCTION 7(MSB) Reserved 0 — 6 Reserved 0 — 5 Remote 6 OVERT 0 Channel 6 Remote-Diode Overtemperature Status Bit. This bit is set to logic 1 when the channel 6 remote-diode temperature exceeds the temperature threshold limit in the remote 6 OVERT high-limit register. 4 Remote 5 OVERT 0 Channel 5 Remote Diode Overtemperature Status Bit.
PAGE 16
MAX6697 7-Channel Precision Temperature Monitor Table 10. Remote-Sensors Transistor Manufacturer MANUFACTURER MODEL NO. Central Semiconductor (USA) CMPT3904 Rohm Semiconductor (USA) SST3904 Samsung (Korea) KST3904-TF Siemens (Germany) SMBT3904 Zetex (England) FMMT3904CT-ND Note: Discrete transistors must be diode connected (base shorted to collector). Slave Address Table 11 shows the MAX6697 slave addresses. Table 11.
PAGE 17
7-Channel Precision Temperature Monitor TOP VIEW DXP1 1 20 GND DXN1 2 19 SMBCLK DXP2 3 18 SMBDATA DXN2 4 DXP3 5 17 ALERT MAX6697 16 VCC DXN3 6 15 OVERT DXP4 7 14 NC1 DXN4 8 13 NC2 DXP5 9 12 DXP6 DXN5 10 11 DXN6 QSOP/TSSOP Chip Information PROCESS: BiCMOS Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only.
PAGE 18
Revision History REVISION NUMBER REVISION DATE 3 5/09 DESCRIPTION Corrected remote sensor connections in Typical Application Circuit PAGES CHANGED 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.