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MAX6681MEE+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
MAX6680/MAX6681
±1°C Fail-Safe Remote/Local Temperature
Sensors with SMBus Interface
4 _______________________________________________________________________________________
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
MAX6680/81 toc01
SUPPLY VOLTAGE (V)
STANDBY SUPPLY CURRENT (µA)
5.04.54.03.5
1
2
3
4
5
6
7
8
9
10
0
3.0 5.5
STANDBY SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6680/81 toc02
CONVERSION RATE (Hz)
OPERATING SUPPLY CURRENT (µA)
8.0000
4.0000
2.0000
1.0000
0.5000
0.2500
0.1250
100
200
300
400
500
600
0
0.0625
AVERAGE OPERATING SUPPLY CURRENT
vs. CONVERSION RATE
8Hz IS 1
°
C
RESOLUTION
MAX6680/81 toc03
TEMPERATURE (
°
C)
TEMPERATURE ERROR (°C)
1251007550250-25
-2
-1
0
1
2
3
-3
-50 150
TEMPERATURE ERROR
vs. REMOTE-DIODE TEMPERATURE
MAX6680/81 toc04
TEMPERATURE (
°
C)
TEMPERATURE ERROR (°C)
100500
-2
-1
0
1
2
3
-3
-50 150
LOCAL TEMPERATURE ERROR
vs. DIE TEMPERATURE
MAX6680/81 toc05
FREQUENCY (Hz)
TEMPERATURE ERROR (°C)
1M10k100
0
0.2
0.4
0.6
0.8
1.0
1.2
-0.2
110M100k1k10 100M
TEMPERATURE ERROR
vs. POWER-SUPPLY NOISE FREQUENCY
V
IN
= 100mV SQUARE WAVE
APPLIED TO V
CC
WITH NO
0.1
µ
F V
CC
CAPACITOR
LOCAL
DIODE
REMOTE
DIODE
MAX6680/81 toc06
FREQUENCY (Hz)
TEMPERATURE ERROR (°C)
10M1M100k10k1k10010
-1
0
1
2
3
4
5
-2
1 100M
TEMPERATURE ERROR
vs. COMMON-MODE NOISE FREQUENCY
V
IN
= 100mV
P-P
SQUARE WAVE
AC-COUPLED TO DXN
MAX6680/81 toc07
FREQUENCY (Hz)
TEMPERATURE ERROR (°C)
10M1M100k10k1k
0
1
2
3
-1
100 100M
TEMPERATURE ERROR
vs. DIFFERENTIAL NOISE FREQUENCY
V
IN
= 10mV
P-P
SQUARE WAVE
APPLIED TO DXP-DXN
MAX6680/81 toc08
DXP-DXN CAPACITANCE (nF)
TEMPERATURE ERROR (°C)
908070605040302010
-4
-3
-2
-1
0
1
-5
0100
TEMPERATURE ERROR
vs. DXP-DXN CAPACITANCE
MAX6680/MAX6681
±1°C Fail-Safe Remote/Local Temperature
Sensors with SMBus Interface
_______________________________________________________________________________________ 5
Pin Description
PIN
MAX6680 MAX6681
NAME FUNCTION
12V
CC
Supply Voltage Input, 3V to 5.5V. Bypass V
CC
to GND with a 0.1µF capacitor.
A 200Ω series resistor is recommended, but not required for additional noise
filtering. See the Typical Operating Circuit.
2, 5 1, 5
CRIT1,
CRIT0
Hardware-Programmable Default Alarm Threshold for OVERT Limits. Use Table
4 to set default temperatures.
3 3 DXP
Combined Remote-Diode Current Source and A/D Positive Input for Remote-
Diode Channel. DO NOT LEAVE DXP FLOATING; connect DXP to DXN if no
remote diode is used. Place a 2200pF capacitor between DXP and DXN for
noise filtering.
44DXN
Combined Remote-Diode Current Sink and A/D Negative Input. DXN is
internally biased to one diode drop above ground.
6 6 ADD1
SMBus Address Select Pin (Table 9). ADD0 and ADD1 are sampled upon
power-up. Excess capacitance (>50pF) at the address pins when floating may
cause address-recognition problems.
7 7 RESET
Reset Input. Drive RESET high to set all registers to their default values (POR
state). Drive RESET low or leave floating for normal operation.
8 8 GND Ground
99OVERT Overtemperature Active-Low Output. Open drain.
10 10 ADD0 SMBus Slave Address Select Pin (see ADD1).
11 11 ALERT SMBus Alert (Interrupt) Active-Low Output. Open drain.
12 12 SMBDATA SMBus Serial-Data Input/Output, Open Drain
13 13 INT_SEL
Input. Connect high or leave floating to conform to the standard SMBus ALERT
protocol. See the
ALERT
Interrupts section. Connect to GND to invoke
comparator mode, where ALERT is asserted whenever any of the temperature
conditions is violated by the remote sensor. In this mode, ALERT can only be
deasserted by the condition returning within the temperature limits by enabling
the mask bit in the Configuration register.
14 14 SMBCLK SMBus Serial-Clock Input
15 15 STBY
Input. Hardware Standby. Connect to ground to place in device in standby.
Supply current drops below 10µA and all registers’ data are maintained.
Input. Selects which temperature sensor (local, remote, or both) activates
OVERT.
16 16 SENS_SEL
High = Remote, Low = Local, Open = Local and Remote
MAX6680/MAX6681
Detailed Description
The MAX6680/MAX6681 are temperature sensors designed
to work in conjunction with a microprocessor or other
intelligence in thermostatic, process-control, or monitoring
applications. Communication with the MAX6680/MAX6681
occurs through the SMBus serial interface and dedicated
alert pin. The overtemperature alarm OVERT is asserted if
the software or hardware programmed temperature thresh-
olds are exceeded. OVERT can be connected to a fan,
system shutdown, or other thermal management circuitry.
The MAX6680/MAX6681 convert temperatures at a pro-
grammed rate or a single conversion. Legacy mode
conversions have a 1°C resolution. Legacy resolution
represents temperature as 7 bits + sign bit and allows
for faster autonomous conversion rates at 8Hz. The
remote diode temperature can also be represented in
extended-resolution mode. Extended resolution repre-
sents temperature as 10 bits + sign bit and is available
for autonomous conversions that are 4Hz or slower and
single-shot conversions.
The MAX6680/MAX66681 default low-temperature mea-
surement limit is 0 °C. The device temperature measure-
ment can be placed in extended temperature range by
setting bit 3 of the Configuration register to 1. In extend-
ed temperature range, the remote and local temperature
measurement range is extended down to -64°C.
ADC and Multiplexer
The averaging ADC integrates over a 60ms period
(each channel, typically, in the 7-bit + sign “legacy”
mode). Using an averaging ADC attains excellent noise
rejection.
The multiplexer automatically steers bias currents
through the remote and local diodes. The ADC and
associated circuitry measure each diode’s forward volt-
±1°C Fail-Safe Remote/Local Temperature
Sensors with SMBus Interface
6 _______________________________________________________________________________________
RESET
CIRCUITRY
MUX
REMOTE
LOCAL
ADC
2
CONTROL
LOGIC
SMBus
READ
WRITE
8
8
ADDRESS
DECODER
7
S
R
Q
DIODE
FAULT
DXP
DXN
ADD0
SMBCLK
SMBDATA
ADD1
REGISTER BANK
COMMAND BYTE
REMOTE TEMPERATURE
LOCAL TEMPERATURE
ALERT THRESHOLD
ALERT RESPONSE ADDRESS
OVERT THRESHOLD (EXT)
OVERT THRESHOLD (INT)
CRIT0
CRIT1
INT_SEL
STBY
RESET
V
CC
S
R
Q
OVERT
ALERT
SENS_SEL
MAX6680
MAX6681
Figure 1. MAX6680/MAX6681 Functional Diagram
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

MAX6681MEE+T

Mfr. #:
Buy MAX6681MEE+T
Manufacturer:
Maxim Integrated
Description:
Board Mount Temperature Sensors Fail-Safe Temperature Senso
Lifecycle:
New from this manufacturer.
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