19-4097; Rev 0; 4/08
5-Channel Precision Temperature Monitor
with Beta Compensation
The MAX6694 precision multichannel temperature sensor monitors its own temperature and the temperatures
of up to four external diode-connected transistors. All
temperature channels have programmable alert thresholds. Channels 1 and 4 also have programmable
overtemperature thresholds. When the measured temperature of a channel exceeds the respective threshold, a status bit is set in one of the status registers. Two
open-drain outputs, OVERT and ALERT, assert corresponding to these bits in the status register.
The 2-wire serial interface supports the standard system
management bus (SMBus™) protocols: write byte, read
byte, send byte, and receive byte for reading the temperature data and programming the alarm thresholds.
The MAX6694 is specified for a -40°C to +125°C operating temperature range and is available in 16-pin
TSSOP and 5mm x 5mm thin QFN packages.
Features
o Four Thermal-Diode Inputs
o Beta Compensation (Channel 1)
o Local Temperature Sensor
o 1.5°C Remote Temperature Accuracy (+60°C to
+100°C)
o Temperature Monitoring Begins at POR for FailSafe System Protection
o ALERT and OVERT Outputs for Interrupts,
Throttling, and Shutdown
o STBY Input for Hardware Standby Mode
o Small, 16-Pin TSSOP and TQFN Packages
o 2-Wire SMBus Interface
Applications
Ordering Information
Desktop Computers
Notebook Computers
PART
TEMP RANGE
MAX6694UE9A+
-40°C to +125°C
PIN-PACKAGE
MAX6694TE9A+
-40°C to +125°C
+Denotes a lead-free package.
*EP = Exposed pad.
Note: Slave address is 1001 101.
Workstations
Servers
SMBus is a trademark of Intel Corp.
16 TSSOP
16 TQFN-EP*
Pin Configurations appear at end of data sheet.
Typical Application Circuit
+3.3V
CPU
1
DXP1
GND 16
4.7kΩ
EACH
2
DXN1
SMBCLK 15
CLK
3
DXP2
MAX6694 SMBDATA 14
4
DXN2
ALERT 13
5
DXP3
VCC 12
6
DXN3
OVERT 11
7
DXP4
N.C. 10
8
DXN4
100pF
DATA
100pF
INTERRUPT
TO µP
0.1µF
100pF
TO SYSTEM
SHUTDOWN
100pF
STBY
9
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1
MAX6694
General Description
MAX6694
5-Channel Precision Temperature Monitor
with Beta Compensation
ABSOLUTE MAXIMUM RATINGS
VCC, SMBCLK, SMBDATA, ALERT, OVERT,
STBY to GND ....................................................-0.3V to +6.0V
DXP_ to GND..............................................-0.3V to (VCC + 0.3V)
DXN_ to GND ........................................................-0.3V to +0.8V
SMBDATA, ALERT, OVERT Current....................-1mA to +50mA
DXIV_ Current .....................................................................±1mA
Continuous Power Dissipation (TA = +70°C)
16-Pin TQFN, 5mm x 5mm
(derate 33.3mW/°C above +70°C)............................2666.7mW
16-Pin TSSOP
(derate 11.1mW/°C above +70°C) ............................888.9mW
Junction-to-Case Thermal Resistance (θJC) (Note 1)
16-Pin TQFN...................................................................2°C/W
16-Pin TSSOP...............................................................27°C/W
Junction-to-Ambient Thermal Resistance (θJA) (Note 1)
16-Pin TQFN.................................................................30°C/W
16-Pin TSSOP...............................................................90°C/W
ESD Protection (all pins, Human Body Model) ....................±2kV
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = +3.0V to +3.6V, VSTBY = VCC, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VCC = +3.3V and TA =
+25°C.) (Note 2)
PARAMETER
Supply Voltage
SYMBOL
CONDITIONS
VCC
MIN
TYP
3.0
MAX
UNITS
3.6
V
Software Standby Supply Current
ISS
SMBus static
3
10
µA
Operating Current
ICC
During conversion (Note 3)
500
2000
µA
Channel 1 only
11
Other diode channels
8
Temperature Resolution
3 σ Temperature Accuracy
(Remote Channel 1)
VCC = 3.3V, TA = TRJ = +60°C to +100°C
ß = 0.5
TA = TRJ = 0°C to +125°C
TA = TRJ = +60°C to +100°C
VCC = 3.3V
TA = TRJ = 0°C to +125°C
3 σ Temperature Accuracy
(Remote Channels 2–6)
3 σ Temperature Accuracy
(Local)
VCC = 3.3V
6 σ Temperature Accuracy
(Remote Channel 1)
VCC = 3.3V, TA = TRJ = +60°C to +100°C
ß = 0.5
TA = TRJ = 0°C to +125°C
6 σ Temperature Accuracy
(Remote Channels 2–6)
VCC = 3.3V
6 σ Temperature Accuracy
(Local)
VCC = 3.3V
TA = +60°C to +100°C
TA = 0°C to +125°C
TA = TRJ = +60°C to +100°C
Bits
-1.5
+1.5
-2.375
+2.375
-2
+2
-2.5
+2.5
-2
+2
-2.5
+2.5
-3
+3
-4
+4
-3
+3
TA = TRJ = 0°C to +125°C
-3.5
+3.5
TA = +60°C to +100°C
-2.5
+2.5
-3
+3
TA = 0°C to +125°C
Supply Sensitivity of Temperature
Accuracy
±0.2
°C
°C
°C
°C
°C
°C
o
C/V
Remote Channel 1 Conversion Time
tCONV1
190
250
312
ms
Remote Channels 2, 3, 4
Conversion Time
tCONV_
95
125
156
ms
2
_______________________________________________________________________________________
5-Channel Precision Temperature Monitor
with Beta Compensation
(VCC = +3.0V to +3.6V, VSTBY = VCC, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VCC = +3.3V and TA =
+25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
High level, channel 1
Remote-Diode Source Current
Undervoltage-Lockout Threshold
IRJ
UVLO
TYP
MAX
Low level, channel 1
20
High level, channels 2, 3, 4
80
100
120
Low level, channels 2, 3, 4
8
10
12
2.30
2.80
2.95
Falling edge of VCC disables ADC
Undervoltage-Lockout Hysteresis
90
Power-On-Reset (POR) Threshold
VCC falling edge
UNITS
500
1.2
POR Threshold Hysteresis
2.0
µA
V
mV
2.25
90
V
mV
ALERT, OVERT
Output Low Voltage
VOL
ISINK = 1mA
0.3
ISINK = 6mA
0.5
Output Leakage Current
1
V
µA
SMBus INTERFACE (SMBCLK, SMBDATA), STBY
Logic Input Low Voltage
VIL
Logic Input High Voltage
VIH
0.8
VCC = 3.0V
Input Leakage Current
2.2
-1
Output Low Voltage
VOL
Input Capacitance
CIN
V
V
+1
ISINK = 6mA
0.3
5
µA
V
pF
SMBus-COMPATIBLE TIMING (Figures 3 and 4) (Note 4)
Serial-Clock Frequency
Bus Free Time Between STOP
and START Condition
fSMBCLK
tBUF
START Condition Setup Time
Repeat START Condition Setup
Time
tSU:STA
START Condition Hold Time
tHD:STA
STOP Condition Setup Time
tSU:STO
Clock Low Period
tLOW
Clock High Period
tHIGH
Data Hold Time
tHD:DAT
(Note 5)
400
fSMBCLK = 100kHz
4.7
fSMBCLK = 400kHz
1.6
fSMBCLK = 100kHz
4.7
fSMBCLK = 400kHz
0.6
90% of SMBCLK to 90% of SMBDATA,
fSMBCLK = 100kHz
0.6
90% of SMBCLK to 90% of SMBDATA,
fSMBCLK = 400kHz
0.6
10% of SMBDATA to 90% of SMBCLK
0.6
90% of SMBCLK to 90% of SMBDATA,
fSMBCLK = 100kHz
4
90% of SMBCLK to 90% of SMBDATA,
fSMBCLK = 400kHz
0.6
10% to 10%, fSMBCLK = 100kHz
1.3
10% to 10%, fSMBCLK = 400kHz
1.3
µs
µs
µs
µs
µs
90% to 90%
0.6
fSMBCLK = 100kHz
300
fSMBCLK = 400kHz (Note 6)
kHz
µs
µs
900
ns
_______________________________________________________________________________________
3
MAX6694
ELECTRICAL CHARACTERISTICS (continued)
MAX6694
5-Channel Precision Temperature Monitor
with Beta Compensation
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3.0V to +3.6V, VSTBY = VCC, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VCC = +3.3V and TA =
+25°C.) (Note 1)
PARAMETER
Data Setup Time
SYMBOL
tSU:DAT
Receive SMBCLK/SMBDATA Rise
Time
tR
Receive SMBCLK/SMBDATA Fall
Time
tF
Pulse Width of Spike Suppressed
SMBus Timeout
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
4
CONDITIONS
fSMBCLK = 100kHz
250
fSMBCLK = 400kHz
100
TYP
MAX
1
fSMBCLK = 400kHz
0.3
300
0
SMBDATA low period for interface reset
25
UNITS
ns
fSMBCLK = 100kHz
tSP
tTIMEOUT
MIN
37
µs
ns
50
ns
45
ms
All parameters are tested at TA = +85°C. Specifications over temperature are guaranteed by design.
Beta = 0.5 for channel 1 remote transistor.
Timing specifications are guaranteed by design.
The serial interface resets when SMBCLK is low for more than tTIMEOUT.
A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SMBCLK’s falling edge.
_______________________________________________________________________________________
5-Channel Precision Temperature Monitor
with Beta Compensation
SOFTWARE STANDBY SUPPLY CURRENT
vs. SUPPLY VOLTAGE
3.5
3.4
3.3
550
500
450
3.2
MAX6694 toc03
2
CHANNEL 2
1
0
-1
-2
CHANNEL 1
-4
-5
350
3.2
3.3
3.4
3.5
3.6
3.0
3.2
3.4
SUPPLY VOLTAGE (V)
LOCAL TEMPERATURE ERROR
vs. DIE TEMPERATURE
REMOTE-DIODE TEMPERATURE ERROR
vs. POWER-SUPPLY NOISE FREQUENCY
2
1
0
-1
3
2
CHANNEL 2
1
0
-1
-2
-3
0
25
50
75
100
125
CHANNEL 1
0.010
0.100
1.000
10.000
-2
0
-1
-2
3
2
1
0
-1
-2
2
1
0
-1
-2
-4
-4
-5
-5
-5
10.0
10.000
3
-4
1.0
1.000
4
-3
FREQUENCY (MHz)
0.100
5
-3
0.1
0.010
CH 2 REMOTE-DIODE TEMPERATURE
ERROR vs. CAPACITANCE
TEMPERATURE ERROR (°C)
-1
1
FREQUENCY (MHz)
MAX6694 toc08
4
TEMPERATURE ERROR (°C)
0
2
-4
5
MAX6694 toc07
1
3
-5
0.001
CH 1 REMOTE-DIODE TEMPERATURE
ERROR vs. CAPACITANCE
2
100mVP-P
-5
0.001
CH 2 REMOTE-DIODE TEMPERATURE ERROR
vs. COMMON-MODE NOISE FREQUENCY
3
125
-3
FREQUENCY (MHz)
100mVP-P
100
4
-4
DIE TEMPERATURE (°C)
4
75
5
-3
-2
50
LOCAL TEMPERATURE ERROR
vs. POWER-SUPPLY NOISE FREQUENCY
TEMPERATURE ERROR (°C)
TEMPERATURE ERROR (°C)
3
100mVP-P
4
25
TEMPERATURE (°C)
5
MAX6694 toc04
4
0
3.6
SUPPLY VOLTAGE (V)
MAX6694 toc06
3.1
MAX6694 toc05
3.0
MAX6694 toc09
3.0
TEMPERATURE ERROR (°C)
3
-3
400
3.1
TEMPERATURE ERROR (°C)
4
TEMPERATURE ERROR (°C)
SUPPLY CURRENT (µA)
3.6
LOW BETA DIODE CONNECTED TO
CHANNEL 1 WITH RESISTANCE
CANCELLATION AND LOW BETA
600
5
MAX6694 toc02
3.7
SUPPLY CURRENT (µA)
650
MAX6694 toc01
3.8
REMOTE-DIODE TEMPERATURE ERROR
vs. REMOTE-DIODE TEMPERATURE
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
-3
1
10
CAPACITANCE (nF)
100
1
10
100
CAPACITANCE (nF)
_______________________________________________________________________________________
5
MAX6694
Typical Operating Characteristics
(VCC = 3.3V, VSTBY = VCC, TA = +25°C, unless otherwise noted.)
5-Channel Precision Temperature Monitor
with Beta Compensation
MAX6694
Pin Description
PIN
TSSOP
6
TQFN-EP
NAME
FUNCTION
1
15
DXP1
Combined Current Source and A/D Positive Input for Channel 1 Remote Transistor.
Connect to the emitter of a low beta transistor. Leave unconnected or connect to VCC if
no remote transistor is used. Place a 100pF capacitor between DXP1 and DXN1 for
noise filtering.
2
16
DXN1
Base Input for Channel 1 Remote Diode. Connect to the base of a pnp temperaturesensing transistor.
3
1
DXP2
Combined Current Source and A/D Positive Input for Channel 2 Remote Diode. Connect
to the anode of a remote-diode-connected temperature-sensing transistor. Leave
unconnected or connect to VCC if no remote diode is used. Place a 100pF capacitor
between DXP2 and DXN2 for noise filtering.
4
2
DXN2
Cathode Input for Channel 2 Remote Diode. Connect the cathode of the channel 2
remote-diode-connected transistor to DXN2.
5
3
DXP3
Combined Current Source and A/D Positive Input for Channel 3 Remote Diode. Connect
to the anode of a remote-diode-connected temperature-sensing transistor. Leave
unconnected or connect to VCC if no remote diode is used. Place a 100pF capacitor
between DXP3 and DXN3 for noise filtering.
6
4
DXN3
Cathode Input for Channel 3 Remote Diode. Connect the cathode of the channel 3
remote-diode-connected transistor to DXN3.
7
5
DXP4
Combined Current Source and A/D Positive Input for Channel 4 Remote Diode. Connect
to the anode of a remote-diode-connected temperature-sensing transistor. Leave
unconnected or connect to VCC if no remote diode is used. Place a 100pF capacitor
between DXP4 and DXN4 for noise filtering.
8
6
DXN4
Cathode Input for Channel 4 Remote Diode. Connect the cathode of the channel 4
remote-diode-connected transistor to DXN4.
9
7
STBY
Active-Low Standby Input. Drive STBY low to place the MAX6694 in standby mode, or
high for operate mode. Temperature and threshold data are retained in standby mode.
10
8
N.C.
11
9
OVERT
12
10
VCC
13
11
ALERT
14
12
SMBDATA
15
13
SMBCLK
16
14
GND
—
—
EP
No Connection. Must be connected to ground.
Overtemperature Active-Low, Open-Drain Output. OVERT asserts low when the
temperature of channels 1 and 4 exceeds the programmed threshold limit.
Supply Voltage Input. Bypass to GND with a 0.1µF capacitor.
SMBus Alert (Interrupt), Active-Low, Open-Drain Output. ALERT asserts low when the
temperature of any channel exceeds the programmed ALERT threshold.
SMBus Serial Data Input/Output. Connect to a pullup resistor.
SMBus Serial Clock Input. Connect to a pullup resistor.
Ground
Exposed Pad. Connect to a large ground plane to maximize thermal performance. Not
intended as an electrical connection point. (TQFN package only).
_______________________________________________________________________________________
5-Channel Precision Temperature Monitor
with Beta Compensation
The MAX6694 is a precision multichannel temperature
monitor that features one local and four remote temperature-sensing channels with a programmable alert
threshold for each temperature channel and a programmable overtemperature threshold for channels 1 and 4
(see Figure 1). Communication with the MAX6694 is
achieved through the SMBus serial interface and a
dedicated alert output. The alarm outputs, OVERT and
ALERT, assert if the software-programmed temperature
thresholds are exceeded. ALERT typically serves as an
interrupt, while OVERT can be connected to a fan, system shutdown, or other thermal-management circuitry.
ADC Conversion Sequence
In the default conversion mode, the MAX6694 starts the
conversion sequence by measuring the temperature on
channel 1, followed by 2, 3, local channel, and 4. The
conversion result for each active channel is stored in
the corresponding temperature data register.
Low-Power Standby Mode
Enter software standby mode by setting the STOP bit to
1 in the configuration 1 register. Enter hardware standby by pulling STBY low. Software standby mode disables the ADC and reduces the supply current to
approximately 3µA. Hardware standby mode halts the
ADC clock, but the supply current is approximately
VCC
MAX6694
DXP1
ALARM
ALU
DXN1
DXP2
DXN2
DXP3
CURRENT
SOURCES,
BETA
COMPENSATION
AND MUX
INPUT
BUFFER
ADC
OVERT
ALERT
REGISTER BANK
COMMAND BYTE
REMOTE TEMPERATURES
DXN3
DXP4
LOCAL TEMPERATURES
REF
ALERT THRESHOLD
OVERT THRESHOLD
DXN4
ALERT RESPONSE ADDRESS
SMBus
INTERFACE
STBY
SMBCLK
SMBDATA
Figure 1. Internal Block Diagram
_______________________________________________________________________________________
7
MAX6694
Detailed Description
MAX6694
5-Channel Precision Temperature Monitor
with Beta Compensation
SMBus Digital Interface
350µA. During either software or hardware standby,
data is retained in memory. During hardware standby,
the SMBus interface is inactive. During software standby, the SMBus interface is active and listening for
SMBus commands. The timeout is enabled if a start
condition is recognized on SMBus. Activity on the
SMBus causes the supply current to increase. If a
standby command is received while a conversion is in
progress, the conversion cycle is interrupted, and the
temperature registers are not updated. The previous
data is not changed and remains available.
From a software perspective, the MAX6694 appears as
a series of 8-bit registers that contain temperature measurement data, alarm threshold values, and control bits.
A standard SMBus-compatible, 2-wire serial interface is
used to read temperature data and write control bits
and alarm threshold data. The same SMBus slave
address also provides access to all functions.
The MAX6694 employs four standard SMBus protocols:
write byte, read byte, send byte, and receive byte
(Figure 2). The shorter receive byte protocol allows
quicker transfers, provided that the correct data register was previously selected by a read byte instruction.
Use caution with the shorter protocols in multimaster
systems, since a second master could overwrite the
command byte without informing the first master. Figure
3 is the SMBus write-timing diagram and Figure 4 is the
SMBus read-timing diagram.
The remote diode 1 measurement channel provides 11
bits of data (1 LSB = +0.125°C). All other temperaturemeasurement channels provide 8 bits of temperature
data (1 LSB = +1°C). The 8 most significant bits (MSBs)
Operating-Current Calculation
The MAX6694 operates at different operating-current
levels depending on how many external channels are in
use. Assume that ICC1 is the operating current when
the MAX6694 is converting the remote channel 1 and
ICC2 is the operating current when the MAX6694 is converting the other channels. For the MAX6694 with
remote channel 1 and n other remote channels connected, the operating current is:
ICC = (2 x ICC1 + ICC2 + n x ICC2)/(n + 3)
WRITE BYTE FORMAT
S
ADDRESS
WR
ACK
COMMAND
7 BITS
ACK
DATA
8 BITS
SLAVE ADDRESS: EQUIVALENT TO CHIP-SELECT LINE OF
A 3-WIRE INTERFACE
ACK
P
8 BITS
1
DATA BYTE: DATA GOES INTO THE REGISTER
SET BY THE COMMAND BYTE (TO SET
THRESHOLDS, CONFIGURATION MASKS, AND
SAMPLING RATE)
COMMAND BYTE: SELECTS
TO WHICH REGISTER YOU
ARE WRITING
READ BYTE FORMAT
S
ADDRESS
WR
ACK
7 BITS
COMMAND
ACK
S
SLAVE ADDRESS: EQUIVALENT TO CHIP SELECT LINE
ADDRESS
ACK
COMMAND BYTE: SELECTS
FROM WHICH REGISTER YOU
ARE READING
DATA
ACK
7 BITS
COMMAND
ACK
8 BITS
COMMAND BYTE: SENDS COMMAND WITH NO DATA, USUALLY
USED FOR ONE-SHOT COMMAND
SLAVE ADDRESS: REPEATED
DUE TO CHANGE IN DATAFLOW DIRECTION
P
DATA BYTE: READS FROM
THE REGISTER SET BY THE
COMMAND BYTE
SHADED = SLAVE TRANSMISSION.
/// = NOT ACKNOWLEDGED.
P
S
ADDRESS
7 BITS
RD
ACK
DATA
///
8 BITS
DATA BYTE: READS DATA FROM
THE REGISTER COMMANDED
BY THE LAST READ BYTE OR
WRITE BYTE TRANSMISSION;
ALSO USED FOR SMBus ALERT
RESPONSE RETURN ADDRESS
Figure 2. SMBus Protocols
8
///
8 BITS
RECEIVE BYTE FORMAT
WR
S = START CONDITION.
P = STOP CONDITION.
RD
7 BITS
SEND BYTE FORMAT
S
ADDRESS
8 BITS
_______________________________________________________________________________________
P
5-Channel Precision Temperature Monitor
with Beta Compensation
tLOW
B
C
tHIGH
E
D
F
G
I
H
J
K
MAX6694
A
M
L
SMBCLK
SMBDATA
tSU:STA
tHD:STA
tSU:DAT
A = START CONDITION.
B = MSB OF ADDRESS CLOCKED INTO SLAVE.
C = LSB OF ADDRESS CLOCKED INTO SLAVE.
D = R/W BIT CLOCKED INTO SLAVE.
E = SLAVE PULLS SMBDATA LINE LOW.
tHD:DAT
tSU:STO tBUF
J = ACKNOWLEDGE CLOCKED INTO SLAVE.
K = ACKNOWLEDGE CLOCK PULSE.
L = STOP CONDITION.
M = NEW START CONDITION.
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER.
G = MSB OF DATA CLOCKED INTO MASTER.
H = LSB OF DATA CLOCKED INTO MASTER.
I = MASTER PULLS DATA LINE LOW.
Figure 3. SMBus Write-Timing Diagram
A
B
tLOW
C
D
E
F
G
H
tHIGH
I
J
K
L
M
SMBCLK
SMBDATA
tSU:STA tHD:STA
tSU:STO
tSU:DAT
A = START CONDITION.
B = MSB OF ADDRESS CLOCKED INTO SLAVE.
C = LSB OF ADDRESS CLOCKED INTO SLAVE.
D = R/W BIT CLOCKED INTO SLAVE.
E = SLAVE PULLS SMBDATA LINE LOW.
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER.
G = MSB OF DATA CLOCKE D INTO SLAVE.
H = LSB OF DATA CLOCKED INTO SLAVE.
tBUF
I = MASTER PULLS DATA LINE LOW.
J = ACKNOWLEDGE CLOCKED INTO SLAVE.
K = ACKNOWLEDGE CLOCK PULSE.
L = STOP CONDITION.
M = NEW START CONDITION.
Figure 4. SMBus Read-Timing Diagram
Table 1. Main Temperature Register
(High Byte) Data Format
TEMP (°C)
DIGITAL OUTPUT
> +127
+127
+126
Table 2. Extended Resolution Temperature
Register (Low Byte) Data Format
TEMP (°C)
DIGITAL OUTPUT
0111 1111
0
000X XXXX
0111 1111
+0.125
001X XXXX
0111 1110
+0.250
010X XXXX
+25
0001 1001
+0.375
011X XXXX
0
0000 0000
+0.500
100X XXXX
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