MAX6626RMTT+T Maxim Integrated Products, MAX6626RMTT+T Datasheet - Page 11

• Manufacturer Part Number: MAX6626RMTT+T
• Description: IC TEMP SENSOR I2C 6-TDFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX6626RMTT+T

• Function: Temp Monitoring System (Sensor)
• Topology: ADC, Comparator, Register Bank
• Sensor Type: Internal
• Sensing Temperature: -55°C ~ 125°C
• 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: 6-TDFN Exposed Pad
• Full Temp Accuracy: +/- 1 C
• Digital Output - Bus Interface: Serial (I2C)
• Digital Output - Number Of Bits: 12 bit
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

drain, and the MAX6625R/MAX6626R output includes
an internal 35kΩ (typ) pullup resistor. Figure 6 shows
the OT alarm operation and reset details.
A programmable fault queue on the MAX6625/
MAX6626 eliminates spurious alarm activity in noisy
environments. The queue sets the number of consecu-
tive out-of-tolerance temperature readings that must
occur before the OT alarm output is toggled. An out-of-
tolerance reading is above T
fault queue depth defaults to one at power-up and may
be programmed to one, two, four, or six consecutive
conversions. Any time the conversion result is in toler-
ance, and OT is not asserted, the queue is cleared,
even if it contains some out-of-tolerance counts.
Additionally, the fault queue automatically clears at
power-up, in shutdown, or if a master writes to any of
the T
the fault queue is cleared, OT is deasserted.
For example, the fault queue is set to four, two consec-
utive out-of-tolerance readings have occurred, and the
master writes to the T
cleared and begins to look for four new consecutive
out-of-tolerance conversions.
In comparator mode, OT is asserted when the number
of consecutive conversions exceeding the value in the
T
Figure 6. OT Alarm Output and Reset Diagram
HIGH
HIGH
register is equal to the depth of the fault queue.
, T
TEMPERATURE RESPONSE
SHOWN WITH OT SET FOR
I
LOW
(COMPARATOR MODE)
2
(INTERRUPT MODE)
C-Compatible Serial Interface in a SOT23
, or configuration registers. Whenever
______________________________________________________________________________________
ACTIVE LOW
T
LOW
T
HIGH
LOW
9-Bit/12-Bit Temperature Sensors with
OT
OT
register. The fault queue is
HIGH
TEMPERATURE
or below T
DIE
Comparator Mode
Fault Queue
LOW
*
. The
TIME
OT deasserts when the number of consecutive conver-
sions less than the value in the T
to the depth of the fault queue. T
the effective hysteresis of the OT output.
For example, if T
+80°C, and the fault queue depth is set to four, OT
does not assert until four consecutive conversions
exceed +100°C. Then, OT does not deassert until four
consecutive conversions are less than +80°C.
Comparator mode allows autonomous clearing of an OT
fault without the intervention of a master and is ideal to
use for driving a cooling fan (Figure 7).
In interrupt mode, the MAX6625/MAX6626 look for a
T
The OT pin asserts an alarm for an undertemperature
fault, as well as for an overtemperature fault, depending
on certain conditions. If the fault queue is cleared at
power-up, the IC looks for a T
fault, the IC looks for a T
the IC looks for a T
forth if properly deasserted each time. Once either fault
has occurred, it remains active indefinitely until
deasserted by a read of any register, and the device
then begins to look for a fault of the opposite type. Also,
if the fault queue is cleared, OT is deasserted and the
IC once again looks for a T
any fault is subject to the depth of the fault queue.
*
HIGH
or a T
LOW
HIGH
fault based on previous fault activity.
*
HIGH
*THIS ASSUMES DEASSERTION OF OT BY A
MASTER THROUGH THE SERIAL INTERFACE.
SEE INTERRUPT MODE SECTION.
is set to +100°C, T
fault, and it bounces back and
LOW
HIGH
HIGH
fault. After a T
fault. The activation of
LOW
HIGH
fault. After a T
register is equal
Interrupt Mode
minus T
LOW
LOW
is set to
LOW
HIGH
fault,
11
is