MAX6680MEE+T Maxim Integrated Products, MAX6680MEE+T Datasheet - Page 6

• 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

The MAX6680/MAX6681 are temperature sensors designed
to work in conjunction with a microprocessor or other
intelligence in thermostatic, process-control, or monitoring
applications. Communication with the MAX6680/MAX6681
occurs through the SMBus serial interface and dedicated
alert pin. The overtemperature alarm OVERT is asserted if
the software or hardware programmed temperature thresh-
olds are exceeded. OVERT can be connected to a fan,
system shutdown, or other thermal management circuitry.
The MAX6680/MAX6681 convert temperatures at a pro-
grammed rate or a single conversion. Legacy mode
conversions have a 1°C resolution. Legacy resolution
represents temperature as 7 bits + sign bit and allows
for faster autonomous conversion rates at 8Hz. The
remote diode temperature can also be represented in
extended-resolution mode. Extended resolution repre-
±1°C Fail-Safe Remote/Local Temperature
Sensors with SMBus Interface
Figure 1. MAX6680/MAX6681 Functional Diagram
6
_______________________________________________________________________________________
OVERT
ALERT
CRIT0
CRIT1
DXN
DXP
Detailed Description
CIRCUITRY
RESET
V
CC
RESET
Q
Q
R
R
S
S
DIODE
FAULT
LOCAL
REMOTE
MUX
ALERT RESPONSE ADDRESS
OVERT THRESHOLD (EXT)
OVERT THRESHOLD (INT)
REMOTE TEMPERATURE
LOCAL TEMPERATURE
sents temperature as 10 bits + sign bit and is available
for autonomous conversions that are 4Hz or slower and
single-shot conversions.
The MAX6680/MAX66681 default low-temperature mea-
surement limit is 0 °C. The device temperature measure-
ment can be placed in extended temperature range by
setting bit 3 of the Configuration register to 1. In extend-
ed temperature range, the remote and local temperature
measurement range is extended down to -64°C.
The averaging ADC integrates over a 60ms period
(each channel, typically, in the 7-bit + sign “legacy”
mode). Using an averaging ADC attains excellent noise
rejection.
The multiplexer automatically steers bias currents
through the remote and local diodes. The ADC and
associated circuitry measure each diode’s forward volt-
ALERT THRESHOLD
COMMAND BYTE
REGISTER BANK
ADC
8
8
MAX6680
MAX6681
READ
WRITE
7
CONTROL
ADDRESS
DECODER
SMBus
LOGIC
2
ADC and Multiplexer
STBY
INT_SEL
SMBDATA
SMBCLK
SENS_SEL
ADD0
ADD1