MAX6680MEE+T Maxim Integrated Products, MAX6680MEE+T Datasheet - Page 10

• 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

To ensure valid extended data, read extended resolu-
tion temperature data using one of the following
approaches:
1) Put the MAX6680/MAX6681 into standby mode by
2) If the MAX6680/MAX6681 are in run mode, read the
There is a continuity fault detector at DXP that detects
an open circuit between DXP and DXN, or a DXP short
to V
the External Temperature register is loaded with 1000
0000. Additionally, if the fault is an open circuit, bit 2
(OPEN) of the Status byte is set to 1 and the ALERT
condition is activated at the end of the conversion.
Immediately after power-on reset, the Status register
indicates that no fault is present until the end of the first
conversion.
Four registers store ALERT threshold values—one high-
temperature (T
register each for the local and remote channels. If
either measured temperature equals or exceeds the
corresponding ALERT threshold value, the ALERT out-
put is asserted.
The POR state of both ALERT T
1111 or +127°C and the POR state of T
1100 1001 or -55°C.
Two additional registers, RWOE and RWOI, store
remote and local alarm threshold data information cor-
responding to the OVERT output (see the OVERT
Overtemperature Alarm section).
The ALERT output operates in two modes—the typical
interrupt mode and comparator mode. The INT_SEL
input determines the mode. When INT_SEL is connect-
ed to V
floating, the ALERT functions in the interrupt mode.
An ALERT interrupt occurs when the internal or external
temperature reading exceeds a high or low tempera-
ture limit (user programmed) or when the remote diode
is disconnected (for continuity fault detection). The
±1°C Fail-Safe Remote/Local Temperature
Sensors with SMBus Interface
10
setting bit 6 of the Configuration register to 1. Initiate
a one-shot conversion using Send Byte command
0Fh. When this conversion is complete, read the
contents of the temperature data registers.
Status register. If a conversion is in progress, the
BUSY bit is set to 1. Wait for the conversion to com-
plete as indicated by the BUSY bit being set to zero,
then read the temperature data registers.
CC
______________________________________________________________________________________
, GND, or DXN. If an open or short circuit exists,
CC
high, using a weak pullup resistor, or left
HIGH
) and one low-temperature (T
Alarm Threshold Registers
ALERT Interrupt Mode
Diode Fault Alarm
HIGH
registers is 0111
LOW
registers is
ALERT
LOW
)
ALERT interrupt output signal is latched and can be
cleared only by either reading the Status register or by
successfully responding to an Alert Response address.
In both cases, the alert is cleared even if the fault con-
dition still exists, but is reasserted at the end of the next
conversion. The interrupt does not halt automatic con-
versions. The interrupt output pin is open drain so that
multiple devices can share a common interrupt line.
The interrupt rate never exceeds the conversion rate.
Connecting INT_SEL to ground operates the ALERT
output in comparator mode. In the comparator mode,
whenever the temperature of the remote or local temp
sensor goes outside the limits set by T
the ALERT output becomes inactive after the tempera-
Table 2. Data Format (Two’s Complement)
Table 3. Extended Resolution Register
Note: Extended mode applies only for conversion rates of 4Hz
and slower.
Diode Fault
TEMP (°C)
(Short or
127.00
Open)
0.00
-25
-64
25
-1
TEMPERATURE
1
FRACTIONAL
0.000
0.125
0.250
0.375
0.500
0.625
0.750
0.875
DIGITAL OUTPUT
LEGACY MODE
0111 1111
0001 1001
0000 0001
0000 0000
0000 0000
0000 0000
0000 0000
1000 0000
EXTENDED REGISTER
CONTENTS OF
Comparator Mode
000X XXXX
001X XXXX
010X XXXX
011X XXXX
100X XXXX
101X XXXX
110X XXXX
111X XXXX
DIGITAL OUTPUT
EXTENDED
HIGH
0111 1111
0001 1001
0000 0001
1110 0111
1000 0000
0000 0000
1111 1111
1000 0000
RANGE
or T
LOW
,