MAX1668_00 Datasheet, PDF (11/16 Pages) Maxim Integrated Products – Multichannel Remote/Local Temperature Sensor

Multichannel Remote/Local
Temperature Sensor
Table 2. Data Format (Two’s Complement)
TEMP.
(°C)
+130.00
+127.00
+126.50
+126.00
+25.25
+0.50
+0.25
+0.00
-0.25
-0.50
-0.75
-1.00
-25.00
-25.50
-54.75
-55.00
-65.00
-70.00
ROUNDED
TEMP.
(°C)
+127
+127
+127
+126
+25
+1
+0
+0
+0
+0
-1
-1
-25
-25
-55
-55
-65
-65
DIGITAL OUTPUT
DATA BITS
SIGN
MSB
LSB
0
111
1111
0
111
1111
0
111
1111
0
111
1110
0
001
1001
0
000
0001
0
000
0000
0
000
0000
0
000
0000
0
000
0000
1
111
1111
1
111
1111
1
110
0111
1
110
0110
1
100
1001
1
100
1001
1
011
1111
1
011
1111
Diode Fault Alarm
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_CC - 1V (typical) due to the diode current
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 any remote channel is shorted (DXP_ to DXN_ or
DXP_ to GND), the ADC reads 0000 0000 so as not to
trip either the T_HIGH or T_LOW alarms at their POR set-
tings. In applications that are never subjected to 0°C in
normal operation, a 0000 0000 result can be checked
to indicate a fault condition in which DXP_ is acciden-
tally short circuited. Similarly, if DXP_ is short circuited
to V_CC, the ADC reads +127°C for all remote and local
channels, and the device alarms.
ALERT Interrupts
The ALERT interrupt output signal is latched and can
only be cleared by reading the Alert Response address.
Table 3. Read Format for Alert Response
Address (0001100)
BIT
7
(MSB)
6
5
4
3
2
1
0
(LSB)
NAME
ADD7
ADD6
ADD5
ADD4
ADD3
ADD2
ADD1
1
FUNCTION
Provide the current
MAX1668/MAX1805 slave
address that was latched at POR
(Table 8)
Logic 1
Interrupts are generated in response to T_HIGH and T_LOW
comparisons and when a remote diode is disconnected
(for continuity fault detection). The interrupt does not halt
automatic conversions; new temperature data continues
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.
Alert Response Address
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).
The Alert Response can activate several different slave
devices simultaneously, similar to the I²C General Call.
If more than one slave attempts to respond, bus arbitra-
tion rules apply, and the device with the lower address
code wins. The losing device does not generate an
acknowledge and continues to hold the ALERT line low
until serviced (implies that the host interrupt input is
level sensitive). Successful reading of the alert
response address clears the interrupt latch.
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