MAX6680MEE+T Maxim Integrated Products, MAX6680MEE+T Datasheet - Page 13

• Manufacturer Part Number: MAX6680MEE+T
• Description: IC TEMP SENSOR SMBUS 16-QSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX6680MEE+T

• Function: Thermometer, Thermostat
• 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: +/- 5 C, +/- 3 C
• Digital Output - Bus Interface: Serial (2-Wire)
• Digital Output - Number Of Bits: 10 bit + Sign
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 5. Command-Byte Register Bit Assignments
still exists, they are reasserted at the end of the next
conversion. If the MAX6680/MAX6681 are operating in
the comparator mode, bits 2–6 of the Status register
are cleared only after the local and/or remote tempera-
tures return within the set limits.
The bits indicating OVTI and OVTE are cleared only
when the condition no longer exists. Reading the status
byte does not clear the OVERT output or fault bits. One
way to eliminate the fault condition is for the measured
temperature to drop below the temperature threshold
minus the hysteresis value. Another way to eliminate
the fault condition is by writing new values for the
RWOI, RWOE, or HYST registers so that a fault condi-
tion is no longer present.
The MAX6680/MAX6681 incorporate collision avoid-
ance so that completely asynchronous operation is
allowed between SMBus operations and temperature
conversions.
RCRA/WCRA
REGISTER
RCL/WCL
REH/WEH
REL/WEL
RIH/WIH
RIL/WIL
RWOH
RWOL
RWOE
OSHT
RWOI
RDRV
RRTE
REET
HYST
RLTS
RDID
RSL
±1°C Fail-Safe Remote/Local Temperature
ADDRESS
______________________________________________________________________________________
05h/0Bh
06h/0Ch
07h/0Dh
03h/09h
08h/0Eh
04h/0A
00h
01h
02h
0Fh
10h
11h
12h
19h
20h
21h
FEh
Ff
POR STATE
See Table 4
See Table 4
0000 0000
0010 0000
0000 0010
0111 1111
1100 1001
0100 0110
1100 1001
0000 0000
0000 0000
0000 0000
0000 0110
0100 1101
0000 0001
(+127°C)
(+127°C)
( -55°C)
(-55°C)
(+6°C)
at 0°C
(0°C)
0000
0000
0000
Sensors with SMBus Interface
Read Internal Temperature
Read External Temperature
Read Status Register
Read/Write Configuration Byte
Read/Write Conversion Rate Byte
Read/Write Internal ALERT High Limit
Read/Write Internal ALERT Low Limit
Read/Write External ALERT High Limit
Read/Write External ALERT Low Limit
One Shot
Read External Extended Temperature
Read/Write External Offset High Byte
Read/Write External Offset Low Byte
Read/Write External OVERT Limit
Read/Write Internal OVERT Limit
OVERT Hysteresis
Read Manufacturer ID
Read Device Revision
When autoconverting, if the T
close together, it is possible for both high-temp and
low-temp status bits to be set, depending on the
amount of time between status read operations. In
these circumstances, it is best not to rely on the status
bits to indicate reversals in long-term temperature
changes. Instead use a current temperature reading to
establish the trend direction.
The MAX6680/MAX6681 reset at power-on if pin 7 is
taken high, or by software reset through bit 1 of the
Configuration register. When reset occurs, all registers
go to default values, and the SMBus address pins are
sampled.
The Conversion Rate register (Table 8) programs the
time interval between conversions in free-running
FUNCTION
Hardware/Software Reset
Conversion Rate Byte
HIGH
and T
LOW
limits are
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