MAX6689_07 Datasheet, PDF (1/19 Pages) Maxim Integrated Products – 7-Channel Precision Temperature Monitor

19-0567; Rev 1; 8/07
7-Channel Precision Temperature Monitor
General Description
The MAX6689 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 MAX6689 is specified for an operating temperature
range of -40°C to +125°C and is available in 20-pin
QSOP and TSSOP packages.
Applications
Desktop Computers
Notebook Computers
Workstations
Servers
SMBus is a trademark of Intel Corp.
Pin Configuration appears at end of data sheet.
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
♦ STBY Input for Hardware Standby Mode
♦ Small, 20-Pin QSOP and TSSOP Packages
♦ 2-Wire SMBus Interface
Ordering Information
PART
MAX6689EP34+
MAX6689EP38+
MAX6689EP9A+
MAX6689EP9E+
MAX6689UP34+
MAX6689UP38+
MAX6689UP9A+
MAX6689UP9E+
PIN-
PACKAGE
20 QSOP
20 QSOP
20 QSOP
20 QSOP
20 TSSOP
20 TSSOP
20 TSSOP
20 TSSOP
SLAVE
ADDRESS
0011 010
0011 100
1001 101
1001 111
0011 010
0011 100
1001 101
1001 111
PKG
CODE
E20-1
E20-1
E20-1
E20-1
U20-2
U20-2
U20-2
U20-2
Note: All devices are specified over the -40°C to +125°C
temperature range.
+Denotes lead-free package.
Typical Application Circuit
+3.3V
CPU
2200pF
1 _DXP1
2 _DXN1
GND ²⁰
MAX6689 _SMBCLK 19
4.7kΩ
EACH
CLK
3 _DXP2
2200pF
4 _DXN2
5 _DXP3
2200pF
6 _DXN3
7 _DXP4
2200pF
8 _DXN4
9 _DXP5
2200pF
10 _DXN5
SMBDATA ¹⁸
ALERT ¹⁷
V_CC ¹⁶
OVERT ¹⁵
N.C. ¹⁴
STBY ¹³
DXP6 ¹²
DXN6 ¹¹
DATA
INTERRUPT
TO μP
0.1μF
TO SYSTEM
SHUTDOWN
GPU
2200pF
________________________________________________________________ Maxim Integrated Products 1
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or visit Maxim’s website at www.maxim-ic.com.