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MAX6658MSA+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
MAX6657/MAX6658/MAX6659
4 _______________________________________________________________________________________
Typical Operating Characteristics
(V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.)
4.5
4.0
3.5
3.0
2.5
3.0 4.03.5 4.5 5.0 5.5
STANDBY SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6657 toc01
SUPPLY VOLTAGE (V)
STANDBY SUPPLY CURRENT (µA)
0.063 0.5 10.125 0.25 2 4 8 16
OPERATING SUPPLY CURRENT
vs. CONVERSION RATE
MAX6657 toc02
CONVERSION RATE (Hz)
OPERATING SUPPLY CURRENT (µA)
0
200
400
600
8Hz AND 16Hz ARE 1°C RESOLUTION
-3
-2
-1
0
1
2
3
-55 -5-30 20 45 70 95 120
MAX6659
REMOTE TEMPERATURE ERROR
vs. REMOTE-DIODE TEMPERATURE
MAX6657 toc03
TEMPERATURE (°C)
TEMPERATURE ERROR (°C)
FAIRCHILD 2N3906
-3
-2
-1
0
1
2
3
-55 -5-30 20 45 70 95 120
LOCAL TEMPERATURE ERROR
vs. DIE TEMPERATURE
MAX6657 toc04
TEMPERATURE (°C)
TEMPERATURE ERROR (°C)
1
0
-1
-2
-3
10k 1M100k 10M 100M
TEMPERATURE ERROR vs.
POWER-SUPPLY NOISE FREQUENCY
MAX6657 toc05
FREQUENCY (Hz)
TEMPERATURE ERROR (°C)
V
IN
= SQUARE WAVE APPLIED TO V
CC
WITH NO 0.1µF V
CC
CAPACITOR
1
0
-1
-2
-3
0.01k 100k1k 10M 1G
TEMPERATURE ERROR vs.
COMMON-MODE NOISE FREQUENCY
MAX6657 toc06
FREQUENCY (Hz)
TEMPERATURE ERROR (°C)
V
IN
= AC-COUPLED TO DXN
V
IN
= 100mVp-p
1
0
-1
-2
-3
10k 1M100k 10M 100M
TEMPERATURE ERROR vs.
DIFFERENTIAL-MODE NOISE FREQUENCY
MAX6657 toc07
FREQUENCY (Hz)
TEMPERATURE ERROR (°C)
V
IN
= 10mV
P-P
SQUARE WAVE
APPLIED TO DXP-DXN
-5
-4
-3
-2
-1
0
0405020 3010 60 70 80 90 100
TEMPERATURE ERROR vs.
DXP-DXN CAPACITANCE
MAX6657 toc08
DXP-DXN CAPACITANCE (nF)
TEMPERATURE ERROR (°C)
±1°C, SMBus-Compatible Remote/Local Temperature
Sensors with Overtemperature Alarms
MAX6657/MAX6658/MAX6659
_______________________________________________________________________________________ 5
PIN
MAX6657
MAX6658
MAX6659
NAME FUNCTION
11V
CC
Supply Voltage Input, +3V to +5.5V. Bypass to GND with a 0.1µF capacitor. A 200Ω
series resistor is recommended but not required for additional noise filtering. See
Typical Operating Circuit.
2 3 DXP
Combined Remote-Diode Current Source and A/D Positive Input for Remote-Diode
Channel. DO NOT LEAVE DXP UNCONNECTED; connect DXP to DXN if no remote
diode is used. Place a 2200pF capacitor between DXP and DXN for noise filtering.
34DXN
Combined Remote-Diode Current Sink and A/D Negative Input. DXN is internally
biased to one diode drop above ground.
46OVERT1
Overtemperature Active-Low Output, Open-Drain. Output is logic low only when
temperature is above the software programmed threshold.
5 7, 8 GND Ground
69ALERT
SMBus Alert (Interrupt) Active-Low Output, Open-Drain. Asserts when temperature
exceeds user-set limits (high or low temperature). Stays asserted until acknowledged
by either reading the Status register or by successfully responding to an Alert
Response address. See
ALERT
Interrupts.
7 12 SMBDATA SMBus Serial-Data Input/Output, Open-Drain
8 14 SMBCLK SMBus Serial-Clock Input
— 5 ADD
SMBus Address-Select Pin. The MAX6659 is set to one of three available addresses
(connect to V
CC
, GND, or leave open). See Slave Addresses section.
—10OVERT2
Overtemperature Active-Low Output, Open-Drain. Output is logic low only when
temperature is above the software programmed threshold.
—15STBY
Hardware Standby Input. Temperature and comparison threshold data are retained in
standby mode. If STBY is low, the IC is put into standby mode.
— 2, 11, 13, 16 N.C. Not internally connected. Do not make connections to these pins.
Pin Description
±1°C, SMBus-Compatible Remote/Local Temperature
Sensors with Overtemperature Alarms
MAX6657/MAX6658/MAX6659
Detailed Description
The MAX6657/MAX6658/MAX6659 are temperature
sensors designed to work in conjunction with a micro-
processor or other intelligence in thermostatic,
process-control, or monitoring applications. Com-
munication with the MAX6657/MAX6658/MAX6659
occurs through the SMBus serial interface and dedicat-
ed alert pins. Two independent overtemperature alarms
(OVERT1 and OVERT2) are asserted if their software
programmed temperature thresholds are exceeded.
OVERT1 and OVERT2 can be connected to fans, a sys-
tem shutdown, or other thermal management circuitry.
The MAX6657/MAX6658/MAX6659 convert tempera-
tures to digital data either at a programmed rate or a
single conversion. Conversions have a 0.125°C resolu-
tion (extended resolution) or 1°C resolution (legacy res-
olution). Extended resolution represents temperature as
10 bits + sign bit and is available for autonomous con-
versions that are 4Hz and slower and single-shot con-
versions. Legacy resolution represents temperature as
7 bits + sign bit and allows for faster autonomous con-
version rates of 8Hz and 16Hz.
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-
age and compute the temperature based on this volt-
age. If the remote channel is not used, connect DXP to
DXN. Do not leave DXP and DXN unconnected. When a
conversion is initiated, both channels are converted
6 _______________________________________________________________________________________
MUX
REMOTE
LOCAL
ADC
2
CONTROL
LOGIC
SMBus
READ
WRITE
8
8
ADDRESS
DECODER
7
S
R
Q
S
R
Q
S
R
Q
DIODE
FAULT
DXP
DXN
(ADD)
SMBCLK
SMBDATA
REGISTER BANK
COMMAND BYTE
REMOTE TEMPERATURE
LOCAL TEMPERATURE
ALERT THRESHOLD
ALERT RESPONSE
ADDRESS
OVERT1 THRESHOLD
(OVERT2 THRESHOLD)
( ) ARE FOR MAX6659 ONLY
MAX6659 ONLY
V
CC
MAX6657
MAX6658
MAX6659
(STBY)
ALERT
OVERT1
(OVERT2)
Functional Diagram
±1°C, SMBus-Compatible Remote/Local Temperature
Sensors with Overtemperature Alarms
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX6658MSA+

Mfr. #:
Buy MAX6658MSA+
Manufacturer:
Maxim Integrated
Description:
Board Mount Temperature Sensors Remote/Local Temperature Sensor
Lifecycle:
New from this manufacturer.
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