MAX6581TG9A+ Maxim Integrated Products, MAX6581TG9A+ Datasheet

Board Mount Temperature Sensors 1 C ACCUR 8-CH TEMP SENSR

MAX6581TG9A+

Manufacturer Part Number
MAX6581TG9A+
Description
Board Mount Temperature Sensors 1 C ACCUR 8-CH TEMP SENSR
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX6581ATG9A.pdf (24 pages)

Specifications of MAX6581TG9A+

Full Temp Accuracy
+/- 1 C
Package / Case
TQFN-24
Digital Output - Bus Interface
I2C
Digital Output - Number Of Bits
11 bit
Supply Voltage (max)
3.6 V
Supply Voltage (min)
3 V
Description/function
Multichannel Temperature Sensor
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Supply Current
4 uA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
19-5260; Rev 0; 8/10
The MAX6581 precision multichannel temperature
sensor monitors its own temperature and the tempera-
tures of up to seven external diode-connected transis-
tors. All temperature channels have programmable alert
and overtemperature thresholds. When the measured
temperature of a channel crosses the respective thresh-
old, a status bit is set in one of the status registers. Two
open-drain alarm outputs (ALERT and OVERT) assert
corresponding to these bits in the status register(s).
Resistance cancellation is available for all channels and
compensates for high series resistance in circuit-board
traces and thermal diodes.
The 2-wire serial interface accepts SMBus™ protocols
(write byte, read byte, send byte, and receive byte) for
reading the temperature data and programming the
alarm thresholds.
The MAX6581 is specified for an operating temperature
range of -40NC to +125NC and is available in a 24-pin,
4mm x 4mm thin QFN package with an exposed pad.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
**Future product—contact factory for availability.
Note: These devices operate over the -40NC to +125NC operating temperature range.
Typical Application Circuit appears at end of data sheet.
SMBus is a trademark of Intel Corp.
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.
MAX6581TG9A+
MAX6581TG9C+**
MAX6581TG9E+**
MAX6581TG98+**
±1°C Accurate 8-Channel Temperature Sensor
PART
_______________________________________________________________ Maxim Integrated Products 1
General Description
SLAVE ADDRESS
0X9C
0X9A
0X9E
0X98
PIN-PACKAGE
24 TQFN-EP*
24 TQFN-EP*
24 TQFN-EP*
24 TQFN-EP*
Ordering Information/Selector Guide
S
S
S
S
S
S
S
S
Eight Channels to Measure Seven Remote and
One Local Temperature
11-Bit, 0.125NC Resolution
High Accuracy of ±1NC (max) from +60NC to
+100NC (Remote Channels)
-64NC to +150NC Remote Temperature Range
Programmable Undertemperature/
Overtemperature Alerts
SMBus/I
Two Open-Drain Alarm Outputs (ALERT and
OVERT)
Resistance Cancellation on All Remote Channels
TEMPERATURE RANGE
Desktop Computers
Notebook Computers
Workstations
Servers
Data Communications
-40NC to +125NC
-40NC to +125NC
-40NC to +125NC
-40NC to +125NC
OPERATING
2
C-Compatible Interface
TEMPERATURE RANGE
-64NC to +150NC
-64NC to +150NC
-64NC to +150NC
-64NC to +150NC
Applications
MEASURED
Features

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MAX6581TG9A+ Summary of contents

Page 1

... The MAX6581 is specified for an operating temperature range of -40NC to +125NC and is available in a 24-pin, 4mm x 4mm thin QFN package with an exposed pad. PART SLAVE ADDRESS MAX6581TG9A+ 0X9A MAX6581TG9C+** 0X9C MAX6581TG9E+** 0X9E MAX6581TG98+** 0X98 +Denotes a lead(Pb)-free/RoHS-compliant package ...

Page 2

Accurate 8-Channel Temperature Sensor ABSOLUTE MAXIMUM RATINGS (All Voltages Referenced to GND SMBCLK, SMBDATA, ALERT, CC OVERT, STBY to GND ..........................................-0.3V to +4V DXP_ to GND ............................................ -0. DXN_ to GND ........................................... -0. ...

Page 3

Accurate 8-Channel Temperature Sensor ELECTRICAL CHARACTERISTICS (continued +3.0V to +3.6V -40NC to +125NC, unless otherwise noted. Typical values are PARAMETER SYMBOL Conversion Time per Channel t Remote-Diode Source Current DXP_ and ...

Page 4

Accurate 8-Channel Temperature Sensor ELECTRICAL CHARACTERISTICS (continued +3.0V to +3.6V -40NC to +125NC, unless otherwise noted. Typical values are PARAMETER SYMBOL Receive SMBCLK/SMBDATA Rise Time Receive SMBCLK/SMBDATA Fall Time Data-Out Hold ...

Page 5

Accurate 8-Channel Temperature Sensor (V = +3.3V +25NC, unless otherwise noted.) CC STBY CC A LOCAL TEMPERATURE ERROR vs. DIE TEMPERATURE -10 ...

Page 6

Accurate 8-Channel Temperature Sensor TOP VIEW PIN NAME Combined Current Source and ADC Positive Input for Channel 2 Remote Diode. Connect DXP2 to the anode of a remote-diode-connected, temperature-sensing transistor. Leave DXP2 unconnected 1 DXP2 or connect to DXN2 ...

Page 7

Accurate 8-Channel Temperature Sensor PIN NAME Cathode Input for Channel 4 Remote Diode. Connect the cathode of the channel 4 remote-diode- connected transistor to DXN4. If the channel 4 remote transistor is a substrate pnp (e.g CPU ...

Page 8

Accurate 8-Channel Temperature Sensor PIN NAME 21 GND Ground Combined Current Source and ADC Positive Input for Channel 1 Remote Diode. Connect DXP1 to the anode of a remote-diode-connected, temperature-sensing transistor. Leave DXP1 unconnected 23 DXP1 or connect to ...

Page 9

Accurate 8-Channel Temperature Sensor DXP1 DXN1 DXP2 DXN2 DXP3 DXN3 DXP4 DXN4 DXP5 DXN5 DXP6 DXN6 DXP7 DXN7 Figure 1. Internal Block Diagram _______________________________________________________________________________________ INPUT COUNT BUFFER - COUNTER REF SMBus INTERFACE LOCAL TRANSISTOR ...

Page 10

Accurate 8-Channel Temperature Sensor SMBus Digital Interface From a software perspective, the MAX6581 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 inter- face is ...

Page 11

Accurate 8-Channel Temperature Sensor HIGH LOW SMBCLK SMBDATA SU:STA HD:STA SU:DAT A = START CONDITION B = MSB OF ADDRESS CLOCKED INTO SLAVE C = LSB OF ADDRESS CLOCKED INTO SLAVE D ...

Page 12

Accurate 8-Channel Temperature Sensor Table 2. Extended-Resolution Temperature Register (Low-Byte) Data Format TEMPERATURE (NC) 0 +0.125 +0.250 +0.375 +0.500 +0.625 +0.750 +0.875 X = Don’t care. Table 3. Command Byte Register Bit Assignment ADDRESS REGISTER (HEX) Remote 1 01 ...

Page 13

Accurate 8-Channel Temperature Sensor Table 3. Command Byte Register Bit Assignment (continued) ADDRESS REGISTER (HEX) Remote 1 OVERT High 21 Limit Remote 2 OVERT High 22 Limit Remote 3 OVERT High 23 Limit Remote 4 OVERT High 24 Limit ...

Page 14

Accurate 8-Channel Temperature Sensor Diode Fault Detection If a channel’s input DXP_ and DXN_ are left open or are shorted, the MAX6581 detects a diode fault. An open diode fault does not cause either ALERT or OVERT to assert. ...

Page 15

Accurate 8-Channel Temperature Sensor Table 4. Configuration Register (41h) POR BIT NAME VALUE 7 (MSB) STOP 0 6 POR TIMEOUT 4 RESERVED 0 3 RESERVED 0 2 RESERVED 0 1 EXTRANGE 0 0 RESERVED 0 Table ...

Page 16

Accurate 8-Channel Temperature Sensor Status Register Functions There are four status registers (see Tables 7–10). The ALERT High Status register indicates whether a mea- sured local or remote temperature has exceeded the associated threshold limit set in an ALERT ...

Page 17

Accurate 8-Channel Temperature Sensor Table 8. OVERT Status Register (45h) POR BIT NAME STATE 7 (MSB) 0 Remote OVERT Local OVERT 5 0 Remote OVERT Remote OVERT Remote OVERT 4 ...

Page 18

Accurate 8-Channel Temperature Sensor Table 10. ALERT Low Status Register (47h) POR BIT NAME STATE Remote ALERT 7 (MSB) 0 Low Local ALERT Low Remote ALERT 5 0 Low 6 Remote ALERT 4 0 Low 5 ...

Page 19

Accurate 8-Channel Temperature Sensor Table 11. Transistor Ideality Register REGISTER ...

Page 20

Accurate 8-Channel Temperature Sensor Series-Resistance Cancellation Some thermal diodes on high-power ICs have exces- sive series resistance that can cause temperature-mea- surement errors when used with conventional remote- temperature sensors. Channels 1–7 of the MAX6581 have a series-resistance cancellation ...

Page 21

Accurate 8-Channel Temperature Sensor Table 13. Remote Sensors Transistor Suppliers (for Channels 1–7) SUPPLIER Central Semiconductor Corp. (USA) Fairchild Semiconductor (USA) Infineon (Germany) ON Semiconductor (USA) ROHM Semiconductor (USA) Samsung (Korea) Siemens (Germany) Zetex (England) Note: Discrete transistors must ...

Page 22

Accurate 8-Channel Temperature Sensor GND 5–10 mils DXP_ 5–10 mils DXN_ GND Figure 5. Recommended DXP_–DXN_ PCB Traces. The two outer guard traces are recommended if high-voltage traces are near the DXN_ and DXP_ traces. Follow the guidelines below ...

Page 23

Accurate 8-Channel Temperature Sensor CPU DXN1 1 DXP2 100pF 2 DXN2 3 DXP3 100pF 4 DXN3 5 DXP4 6 N.C. 100pF DXN4 7 FPGA Chip Information PROCESS: BiCMOS ______________________________________________________________________________________ 4.7kI 100pF MAX6581 DXP5 DXN5 ...

Page 24

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 24 2010 Maxim Integrated Products © ...

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