MAX6655MEE+ Maxim Integrated Products, MAX6655MEE+ Datasheet

IC TEMP SENSOR 4CH 16-QSOP

MAX6655MEE+

Manufacturer Part Number
MAX6655MEE+
Description
IC TEMP SENSOR 4CH 16-QSOP
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX6655MEE+

Function
Temp Monitoring System (Sensor)
Topology
ADC, Multiplexer, Register Bank
Sensor Type
External & Internal
Sensing Temperature
-55°C ~ 125°C, External Sensor
Output Type
I²C™/SMBus™
Output Alarm
Yes
Output Fan
Yes
Voltage - Supply
3 V ~ 5.5 V
Operating Temperature
-55°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
16-QSOP
Full Temp Accuracy
+/- 3 C
Digital Output - Bus Interface
Serial (2-Wire)
Digital Output - Number Of Bits
11 bit
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 55 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX6655/MAX6656 are precise voltage and tem-
perature monitors. The digital thermometer reports the
temperature of two remote sensors and its own die tem-
perature. The remote sensors are diode-connected
transistors—typically a low-cost, easily mounted
2N3906 PNP type—that replace conventional thermis-
tors or thermocouples. Remote accuracy is ±1°C for
multiple transistor manufacturers with no calibration
necessary. The remote channels can also measure the
die temperature of other ICs, such as microprocessors,
that contain a substrate-connected PNP with its collec-
tor grounded and its base and emitter available for tem-
perature-sensing purposes. The temperature is
digitized with 11-bit resolution.
The MAX6655/MAX6656 also measure their own supply
voltage and three external voltages with 8-bit resolution.
Each voltage input’s sensitivity is set to give approxi-
mately 3/4-scale output code when the input voltage is
at its nominal value. The MAX6655 operates at +5V
supply and its second voltage monitor is 3.3V. The
MAX6656 operates on a +3.3V supply and its second
voltage monitor is 5V.
The 2-wire serial interface accepts standard SMBus™
Write Byte, Read Byte, Send Byte, and Receive Byte
commands to program the alarm thresholds and to read
data. The MAX6655/MAX6656 also provide SMBus alert
response and timeout functions. The MAX6655/MAX6656
measure automatically and autonomously, with the con-
version rate programmable. The adjustable rate allows
the user to control the supply current.
In addition to the SMBus ALERT output, the MAX6655/
MAX6656 feature an OVERT output, which is used as a
temperature reset that remains active only while the
temperature is above the maximum temperature limit.
The OVERT output is optimal for fan control or for sys-
tem shutdown.
19-2117; Rev 1; 5/06
S.
*P,
Is
ae
c-
SMBus is a trademark of Intel Corp.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Dual Remote/Local Temperature Sensors and
Notebooks
Thin Clients
Servers
________________________________________________________________ Maxim Integrated Products
General Description
Applications
Workstations
Communication
Equipment
Desktop PC
Four-Channel Voltage Monitors
♦ Three Temperature Channels
♦ Four Voltage Channels
♦ 11-Bit, 0.125°C Resolution
♦ High Accuracy: ±1°C Over +60°C to +100°C
♦ Programmable Under/Over-Threshold Alarms
♦ Programmable Power-Saving Mode
♦ No Calibration Required
♦ SMBus/I
♦ OVERT Output for Fan Control and System
Typical Application Circuit appears at end of data sheet.
MAX6655MEE
MAX6656MEE
Temperature Range
Shutdown
Two Remote PN Junctions
One Local Sensor
+12V, +5V, +3.3V, +2.5V
Three External Monitors
One Internal Supply Monitor
PART
TOP VIEW
2
C-Compatible Interface
DXP1
DXN1
ADD0
ADD1
DXP2
DXN2
GND
V
CC
-55°C to +125°C
-55°C to +125°C
TEMP RANGE
1
2
3
4
5
6
7
8
Ordering Information
MAX6655
MAX6656
QSOP
Pin Configuration
PIN-
PACKAGE
16 QSOP
16 QSOP
16
15
14
13
12
11
10
9
STBY
SMBCLK
OVERT
SMBDATA
ALERT
V
V
V
IN2
IN1
IN3
Features
PKG
CODE
E16-5
E16-5
1

Related parts for MAX6655MEE+

MAX6655MEE+ Summary of contents

Page 1

... Servers S. * SMBus is a trademark of Intel Corp. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Four-Channel Voltage Monitors ♦ Three Temperature Channels Two Remote PN Junctions One Local Sensor ♦ Four Voltage Channels +12V, +5V, +3 ...

Page 2

Dual Remote/Local Temperature Sensors and Four-Channel Voltage Monitors ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0.3V to +6V CC DXN_ to GND ........................................................-0.3V to +0.8V SMBCLK, SMBDATA, ALERT, STBY, OVERT to GND .....................................................-0. GND............................................................-0.3V to +16V IN1 ...

Page 3

Dual Remote/Local Temperature Sensors and ELECTRICAL CHARACTERISTICS (continued +3.0V to +3.6V for MAX6656 are +3.3V for MAX6656 +5.0V for MAX6655 PARAMETER SYMBOL Remote Junction Current (DXP, DXN) ...

Page 4

Dual Remote/Local Temperature Sensors and Four-Channel Voltage Monitors (T = +25°C, unless otherwise noted.) A REMOTE TEMPERATURE ERROR vs. PC BOARD RESISTANCE 20 10 PATH = DXP TO GND 0 PATH = DXP TO V (5V) CC -10 -20 1 ...

Page 5

Dual Remote/Local Temperature Sensors and PIN NAME 1 V Supply Voltage. +5V for MAX6655; +3.3V for MAX6656. Bypass V CC External Diode 1 Positive Connection. DXP1 is the combined current source and ADC positive input 2 DXP1 for remote-diode 1. ...

Page 6

Dual Remote/Local Temperature Sensors and Four-Channel Voltage Monitors Write Byte Format S ADDRESS WR 7 bits Slave Address: equiva- lent to chip-select line of a 3-wire interface Read Byte Format S ADDRESS WR ACK 7 bits Slave Address: equiva- lent ...

Page 7

Dual Remote/Local Temperature Sensors and LOW HIGH SMBCLK SMBDATA t t HD:STA SU:STA A = START CONDITION B = MSB OF ADDRESS CLOCKED INTO SLAVE C = LSB OF ADDRESS CLOCKED INTO SLAVE D = R/W ...

Page 8

Dual Remote/Local Temperature Sensors and Four-Channel Voltage Monitors +3V TO +5.5V V MAX6655 MAX6656 SMBus SMBCLK SERIAL SMBDATA INTERFACE ALERT (TO HOST) DXP2 DXN2 2N3906 2200pF Figure 4. System Shutdown Application The temperature data is stored in internal registers RRTE, ...

Page 9

Dual Remote/Local Temperature Sensors and Alarm Threshold Registers Seventeen registers store ALARM and OVERT thresh- old data. The MAX6655/MAX6656 contain three regis- ters for high-temperature (T HIGH temperature (T ), four for high-voltage (V LOW for low-voltage (V ) thresholds, ...

Page 10

Dual Remote/Local Temperature Sensors and Four-Channel Voltage Monitors places constraints on high-frequency noise rejection. Lay out the PC board carefully with proper external noise filtering for high-accuracy remote measurements in electrically noisy environments. Filter high-frequency electromagnetic interference (EMI) at DXP ...

Page 11

Dual Remote/Local Temperature Sensors and Table 1. Conversion Rate Control Byte DATA BETWEEN CONVERSION (RCRA, 04H) 00h 01h 02h 03h 04h 05h 06h 07h Table 2. Temperature Data Format ROUNDED TEMP (°C) TEMP (°C) 130.00 +127 127.00 +127 126.00 +126 ...

Page 12

Dual Remote/Local Temperature Sensors and Four-Channel Voltage Monitors Table 4. Voltage Data Format INPUT VOLTAGE AT V ADC OUTPUT CODE (+12V) LSB weight 57.1mV 64 (≈ 1/4 scale) 4.343V to 4.400V 65 4.400V to 4.457V 66 4.457V to 4.514V — ...

Page 13

Dual Remote/Local Temperature Sensors and Table 6. Command Byte Register Map REGISTER ADDRESS RLTS 00h RRTE 01h RSL 02h RCL 03h RCRA 04h RLHN 05h RLLI 06h RRHI 07h RRLS 08h WCA 09h WCRW 0Ah WLHO 0Bh WLLM 0Ch WRHA ...

Page 14

Dual Remote/Local Temperature Sensors and Four-Channel Voltage Monitors Table 6. Command Byte Register Map (continued) REGISTER ADDRESS RV1HL 28h RV1LL 29h RV2HL 2Ah RV2LL 2Bh RV3HL 2Ch RV3LL 2Dh RV0 2Eh RV1 2Fh RV2 30h RV3 31h RSL2 32h RCL2 ...

Page 15

Dual Remote/Local Temperature Sensors and Table 8. Configuration Byte 2-Bit Assignments BIT NAME Disable Remote Temperature 1 7 (MSB) Measurement Disable Remote 6 Temperature 2 Measurement Disable Internal 5 Temperature Measurement Disable V IN3 4 Measurement Disable V IN2 3 ...

Page 16

Dual Remote/Local Temperature Sensors and Four-Channel Voltage Monitors Table 10. Status Byte 2-Bit Assignments BIT NAME POR STATE 7(MSB R1O 5 R2O 4 DODS2 CCA Table 11. ...

Page 17

Dual Remote/Local Temperature Sensors and 2.5V CPU TO 12V TO 3. 2.5V 2N3906 2200pF MAX6655/MAX6656 V IN1 V IN2 V IN3 DXP1 DXN1 ______________________________________________________________________________________ Four-Channel Voltage Monitors Typical Application Circuit 0.1µ DXP1 MAX6655 MAX6656 SMBCLK ...

Page 18

... 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. 18 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2006 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc ...

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