MAX6626 MAXIM [Maxim Integrated Products], MAX6626 Datasheet - Page 5

• Manufacturer Part Number: MAX6626
• Description: 9-Bit/12-Bit Temperature Sensors with I2C-Compatible Serial Interface in a SOT23
• Manufacturer: MAXIM [Maxim Integrated Products]

The MAX6625/MAX6626 continuously convert their die
temperatures into digital values using their self-con-
tained delta-sigma ADCs. The resulting data is read-
able at any time through the I
interface. A dedicated alarm output asserts if the result
exceeds the value in the programmable high-tempera-
ture register. A programmable fault queue sets the
number of faults that must occur before the alarm
asserts, preventing spurious alarms in noisy environ-
ments. The alarm output polarity is selectable and
deasserts based on either of two operating modes,
comparator or interrupt. In comparator mode, the OT
output deasserts if the temperature conversion result
falls below the programmable low-temperature register
value (subject to the fault queue conditions) providing
adjustable hysteresis. In interrupt mode, the OT output
deasserts when any register is read through the serial
interface. Each conversion cycle takes about 130ms. At
power-up, the temperature register is set to 8000H until
the first conversion is completed.
The MAX6625/MAX6626 feature a shutdown mode,
accessible through the serial interface, that saves power
by turning off everything but the power-on reset and the
I
temperature register is set to 8000H. The device func-
Figure 2. Functional Block Diagram
2
C-compatible interface. While in shutdown mode the
I
2
C-Compatible Serial Interface in a SOT23
_______________________________________________________________________________________
Detailed Description
9-Bit/12-Bit Temperature Sensors with
BANDGAP
REGISTER
ADDRESS
REGISTER
POINTER
2
TEMP SIGNAL
C-compatible serial
REFERENCE
SERIAL BUS INTERFACE
CONFIGURATION REGISTER
TEMPERATURE REGISTER
T
T
HIGH
LOW
REGISTER
REGISTER
ADC
tions as a slave on the I
Write Byte, Write Word, Read Byte, and Read Word com-
mands. Four separate addresses can be configured with
the ADD pin, allowing up to four MAX6625/MAX6626
devices to be placed on the same bus. Figure 2 shows
the functional block diagram of the MAX6625/MAX6626.
The MAX6625/MAX6626 are readable and programma-
ble through their I
Figures 3 and 4 show the timing details of the clock
(SCL) and data (SDA) signals. The device functions as
a slave on the I
Byte, Write Word, Read Byte, and Read Word com-
mands.
Four separate addresses can be configured with the
ADD pin, allowing up to four MAX6625/MAX6626s to be
placed on the same bus. The address is selected by
connecting the ADD pin to either of four places: GND
(address 0), V
(address 3). Table 1 shows the full I
address for each state.
MAX6625
MAX6626
COMPARATOR
SET-POINT
COUNTER
QUEUE
FAULT
S
2
(address 1), SDA (address 2), or SCL
C-compatible bus and supports Write
2
C-compatible serial interface.
MAX665_ R
ONLY
2
C-compatible bus supporting
I
2
C-Compatible Operation
+Vs
OT
GND
SDA
SCL
ADD
Serial interface
2
C-compatible
Addressing
5