MAX7504MUA+T Maxim Integrated Products, MAX7504MUA+T Datasheet - Page 9

• Manufacturer Part Number: MAX7504MUA+T
• Description: IC TEMP SENSOR DIGIT 8-UMAX
• Manufacturer: Maxim Integrated Products

Specifications of MAX7504MUA+T

• Function: Temp Sensor, Watchdog
• Topology: ADC (Sigma Delta), 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: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Full Temp Accuracy: +/- 3 C
• Digital Output - Bus Interface: Serial (2-Wire, I2C)
• Digital Output - Number Of Bits: 9 bit
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

See Figure 4. Set bit D1 to 1 to run the overtemperature
shutdown block in interrupt mode. OS is asserted in
interrupt mode when the temperature rises above the
T
deasserted only after performing a read operation.
Set bit D0, the shutdown bit, to zero for normal opera-
tion. Set bit D0 to 1 to shut down the MAX7500–
MAX7504 internal blocks, dropping the supply current
to 3µA. The I
shutdown bit is set. The T
registers can still be written to and read from while in
shutdown.
In comparator mode, the OS output behaves like a ther-
mostat. The output asserts when the temperature rises
above the limit set in the T
deasserts when the temperature falls below the limit set
in the T
can be used to turn on a cooling fan, initiate an emer-
gency shutdown signal, or reduce system clock speed.
Table 5. Configuration Register Definition
Table 6. Configuration Register Fault
Queue Bits
Table 7. T
X = Don’t care.
COMMAND
OS
Write
Read
D4
value or falls below the T
0
0
1
1
D7
0
HYST
register. In comparator mode, the OS output
2
OS
1 = negative
1 = negative
0 = positive
0 = positive
C interface remains active as long as the
Digital Temperature Sensors and Thermal
Sign bit
Sign bit
D15
and T
D3
_______________________________________________________________________________________
0
1
0
1
D6
0
Watchdog with Bus Lockup Protection
HYST
OS
64°C
64°C
MSB
MSB
D14
T
, T
OS
OS
HYST
Register Definitions
NO. OF FAULTS
and T
register. The output
32°C
32°C
1 (POR state)
HYST
D5
D13
0
, and configuration
UPPER BYTE
HYST
2
4
6
value. OS is
16°C
16°C
D12
Registers
Fault queue
D4
D11
8°C
8°C
D10
4°C
4°C
Fault queue
In interrupt mode, exceeding T
remains asserted until a read operation is performed on
any of the registers. Once OS has asserted due to
crossing above T
again only when the temperature drops below T
The output remains asserted until it is reset by a read.
Putting the MAX7500–MAX7504 into shutdown mode
also resets OS.
The T
bytes, with bits D15–D7 containing the data. Bits
D6–D0 are don’t cares when writing to these two regis-
ters and read-back zeros when reading from these reg-
isters. The LSB represents 0.5°C while the MSB
represents 64°C. See Table 7.
Figure 4. OS Timing Diagram
(COMPARATOR MODE)
OS SET ACTIVE LOW
OS SET ACTIVE LOW
(INTERRUPT MODE)
2°C
2°C
D9
D3
TEMPERATURE
OS
OS OUTPUT
OS OUTPUT
1°C
1°C
D8
and T
T
HYST
T
OS
OS polarity
0.5°C
0.5°C
LSB
LSB
HYST
D7
D2
OS
and is then reset, it is asserted
registers are accessed with 2
D6
X
0
OPERATION
READ
D5
X
0
Comparator/
LOWER BYTE
interrupt
OS
D4
D1
X
0
also asserts OS. OS
OPERATION
READ
D3
X
0
D2
X
0
Shutdown
OPERATION
D0
D1
READ
X
0
HYST
D0
X
0
9
.