MAX1617AMEE Maxim Integrated Products, MAX1617AMEE Datasheet - Page 11

• Manufacturer Part Number: MAX1617AMEE
• Description: IC TEMP SENSOR SMBUS SRL 16-QSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1617AMEE

• Function: Thermometer, Thermostat
• Topology: ADC, Comparator, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -55°C ~ 125°C, External Sensor
• Output Type: I²C™/SMBus™
• Output Alarm: Yes
• Output Fan: No
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Full Temp Accuracy: +/- 3 C
• Digital Output - Bus Interface: Serial (2-Wire)
• Digital Output - Number Of Bits: 7 bit + Sign
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Case: ssop
• Dc: 00+/01+
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Four registers store alarm threshold data, with high-
temperature (T
isters for each A/D channel. If either measured
temperature equals or exceeds the corresponding
alarm threshold value, an ALERT interrupt is asserted.
The power-on-reset (POR) state of both T
is full scale (0111 1111, or +127°C). The POR state of
both T
There is a continuity fault detector at DXP that detects
whether the remote diode has an open-circuit condi-
tion. At the beginning of each conversion, the diode
fault is checked, and the status byte is updated. This
fault detector is a simple voltage detector; if DXP rises
above V
source, a fault is detected. Note that the diode fault
isn’t checked until a conversion is initiated, so immedi-
ately after power-on reset the status byte indicates no
fault is present, even if the diode path is broken.
If the remote channel is shorted (DXP to DXN or DXP to
GND), the ADC reads 0000 0000 so as not to trip either
Table 2. Data Format (Two’s Complement)
+130.00
+127.00
+126.50
+126.00
+25.25
TEMP.
-25.00
-25.50
-54.75
-55.00
-65.00
-70.00
+0.50
+0.25
-0.25
-0.50
-0.75
-1.00
0.00
(°C)
LOW
CC
registers is 1100 1001 or -55°C.
- 1V (typical) due to the diode current
ROUNDED
HIGH
TEMP.
+127
+127
+127
+126
(°C)
+25
-25
-26
-55
-55
-65
-65
+1
______________________________________________________________________________________
-1
-1
0
0
0
0
) and low-temperature (T
Alarm Threshold Registers
SIGN
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Remote/Local Temperature Sensor
Diode Fault Alarm
DIGITAL OUTPUT
DATA BITS
MSB
111
111
111
111
001
000
000
000
000
000
111
111
110
110
100
100
011
011
HIGH
LOW
registers
with SMBus Serial Interface
1111
1111
1111
1110
1001
0001
0000
0000
0000
0000
1111
1111
0111
0110
1001
1001
1111
1111
LSB
) reg-
the T
applications that are never subjected to 0°C in normal
operation, a 0000 0000 result can be checked to indi-
cate a fault condition in which DXP is accidentally short
circuited. Similarly, if DXP is short circuited to V
ADC reads +127°C for both remote and local channels,
and the device alarms.
The ALERT interrupt output signal is latched and can
only be cleared by reading the Alert Response address.
Interrupts are generated in response to T
comparisons and when the remote diode is disconnect-
ed (for continuity fault detection). The interrupt does not
halt automatic conversions; new temperature data con-
tinues to be available over the SMBus interface after
ALERT is asserted. The interrupt output pin is open-drain
so that devices can share a common interrupt line. The
interrupt rate can never exceed the conversion rate.
The interface responds to the SMBus Alert Response
address, an interrupt pointer return-address feature
(see Alert Response Address section). Prior to taking
corrective action, always check to ensure that an inter-
rupt is valid by reading the current temperature.
The SMBus Alert Response interrupt pointer provides
quick fault identification for simple slave devices that
lack the complex, expensive logic needed to be a bus
master. Upon receiving an ALERT interrupt signal, the
host master can broadcast a Receive Byte transmission
to the Alert Response slave address (0001 100). Then
any slave device that generated an interrupt attempts
to identify itself by putting its own address on the bus
(Table 3).
Table 3. Read Format for Alert Response
Address (0001100)
(MSB)
(LSB)
BIT
7
6
5
4
3
2
1
0
HIGH
or T
NAME
ADD7
ADD6
ADD5
ADD4
ADD3
ADD2
ADD1
1
LOW
alarms at their POR settings. In
Provide the current MAX1617A
slave address that was latched at
POR (Table 8)
Logic 1
Alert Response Address
FUNCTION
A A L L E E R R T T Interrupts
HIGH
and T
CC
, the
LOW
11