MAX6690MEE+ Maxim Integrated Products, MAX6690MEE+ Datasheet - Page 11

• Manufacturer Part Number: MAX6690MEE+
• Description: IC TEMP SENSOR SMBUS 16-QSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX6690MEE+

• Function: Thermometer, Thermostat
• Topology: ADC, 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: +/- 5 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
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

When the conversion rate is greater than 1Hz, tempera-
ture data can be read from the read internal tempera-
ture (00h) and read external temperature (01h)
registers. The temperature data format is 7 bits plus
sign in two’s-complement form for each channel, with
the LSB representing 1°C (Table 2), transmitted MSB
first. When the conversion rate is less than 1Hz, the
extended data can be read from the read external
extended temperature register (10h) and the read inter-
nal extended temperature register (11h), and the first 3
bits of the register represent 1/2, 1/4, and 1/8 of a
degree. Measurements are offset by +1/2°C to mini-
mize quantization errors; for example, +99.6°C is
reported as +100°C.
When the conversion rate is 1Hz or less, the first 8 bits
of temperature data can be read from the read internal
temperature (00h) and read external temperature (01h)
registers, the same as for faster conversion rates. An
additional 3 bits can be read from the read external
Table 2. Data Format
Table 3. Extended Resolution Register
(short or open)
<0.00 (Note 1)
TEMP (°C)
Diode fault
130.00
127.00
126.00
25.25
<-64
0.50
0.00
-1
TEMPERATURE
FRACTIONAL
0.000
0.125
0.250
0.375
0.500
0.625
0.750
0.875
2°C Accurate Remote/Local Temperature
______________________________________________________________________________________
(Extended temp mode)
(Extended temp mode)
ROUNDED TEMP (°C)
(Normal mode)
+127
+127
+127
+25
+1
0
Sensor with SMBus Serial Interface
DIGITAL OUTPUT
000X XXXX
001X XXXX
010X XXXX
011X XXXX
100X XXXX
101X XXXX
110X XXXX
111X XXXX
0 111 1111
0 111 1111
0 111 1111
0 001 1001
0 000 0001
0 000 0000
1 000 0000
1 111 1111
1 000 0000
1 000 0000
DIGITAL
OUTPUT
extended temperature and read internal extended tem-
perature registers, which extend the resolution to
0.125°C per LSB (Table 3).
If a conversion ends after reading the main register but
before reading the extended register, the extended
register contains the 3LSBs from the new conversion
while the main register contains the 8MSBs from the
previous conversion. The extended data in this case is
meaningless. To avoid this problem, read extended
resolution temperature data using one of the following
approaches:
1) Put the MAX6690 into standby mode by setting bit 6
2) If the MAX6690 is in run mode and the conversion
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 POR state of both T
(0111 1111, or +127°C). The POR state of both T
registers is 1100 1001 or -55°C.
There is a continuity fault detector at DXP that detects
whether the remote diode has an open-circuit condition
or if DXP is shorted to DXN, GND, or V
circuit exists, then the temperature register is loaded
with 1000 0000, and bit 3 of the status register is set to
1 at the end of a conversion. This means that immedi-
ately after POR, the status byte indicates no fault is pre-
sent until the end of the first conversion.
of the configuration register to 1. Initiate a one-shot
conversion using Command Byte 0Fh. When this
conversion is complete, read the contents of the
temperature data registers.
rate is not set to either 1Hz or 8Hz, read the Status
Byte. If the BUSY bit indicates that a conversion is
in progress, wait until the conversion is complete as
indicated by the BUSY bit. Then immediately read
the contents of the temperature data registers. If no
conversion is in progress, the data can be read
within a few µs, which is a sufficiently short period
to ensure that a new conversion can’t be completed
until after the data has been read.
Note: Extended resolution applies only for conver-
sion speeds of 1Hz and below.
HIGH
) and low-temperature (T
Alarm Threshold Registers
HIGH
Diode Fault Alarm
registers is full scale
CC
. If an open
LOW
) reg-
LOW
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