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PDF MAX1619 Data sheet ( Hoja de datos )
| Número de pieza | MAX1619 | |
| Descripción | Remote/Local Temperature Sensor with Dual- Alarm Outputs and SMBus Serial Interface | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1483; Rev 0; 4/99
Remote/Local Temperature Sensor with Dual-
Alarm Outputs and SMBus Serial Interface
________________General Description
The MAX1619 is a precise digital thermometer that reports
the temperature of both a remote sensor and its own
package. The remote sensor is a diode-connected transis-
tor—typically a low-cost, easily mounted 2N3904 NPN
type—that replaces conventional thermistors or thermo-
couples. Remote accuracy is ±3°C for multiple transistor
manufacturers, with no calibration needed. The remote
channel can also measure the die temperature of other
ICs, such as microprocessors, that contain an on-chip,
diode-connected transistor.
The 2-wire serial interface accepts standard System
Management Bus (SMBus®) Write Byte, Read Byte, Send
Byte, and Receive Byte commands to program the alarm
thresholds and to read temperature data. The data format
is 7 bits plus sign, with each bit corresponding to 1°C, in
two’s complement format. Measurements can be done
automatically and autonomously, with the conversion rate
programmed by the user or programmed to operate in a
single-shot mode. The adjustable rate allows the user to
control the supply-current drain.
The MAX1619 is nearly identical to the popular MAX1617A,
with the additional feature of an overtemperature alarm out-
put (OVERT) that responds to the remote temperature; this
is optimal for fan control.
________________________Applications
Desktop and Notebook
Computers
Central Office
Telecom Equipment
Smart Battery Packs
Test and Measurement
LAN Servers
Multichip Modules
Industrial Controls
___________________Pin Configuration
____________________________Features
o Two Channels Measure Both Remote and Local
Temperatures
o No Calibration Required
o SMBus 2-Wire Serial Interface
o Programmable Under/Overtemperature Alarms
o OVERT Output for Fan Control
o Supports SMBus Alert Response
o Supports Manufacturer and Device ID Codes
o Accuracy
±2°C (+60°C to +100°C, local)
±3°C (-40°C to +125°C, local)
±3°C (+60°C to +100°C, remote)
o 3µA (typ) Standby Supply Current
o 70µA (max) Supply Current in Auto-Convert Mode
o +3V to +5.5V Supply Range
o Write-Once Protection
o Small 16-Pin QSOP Package
Ordering Information
PART
MAX1619MEE
TEMP. RANGE
-55°C to +125°C
PIN-PACKAGE
16 QSOP
Typical Operating Circuit
0.1µF
+3V TO +5.5V
200Ω
TOP VIEW
VCC 1
GND 2
DXP 3
DXN 4
N.C. 5
ADD1 6
GND 7
GND 8
MAX1619
16 N.C.
15 STBY
14 SMBCLK
13 N.C.
12 SMBDATA
11 ALERT
10 ADD0
9 OVERT
QSOP
SMBus is a registered trademark of Intel Corp.
2N3904
VCC STBY
MAX1619
DXP SMBCLK
DXN
2200pF
SMBDATA
ALERT
OVERT
ADD0 ADD1 GND
10k EACH
CLOCK
DATA
INTERRUPT
TO µC
FAN
CONTROL
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
Remote/Local Temperature Sensor with Dual-
Alarm Outputs and SMBus Serial Interface
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
TEMPERATURE ERROR vs.
COMMON-MODE NOISE FREQUENCY
10
VIN = SQUARE WAVE
AC-COUPLED TO DXN
8
6 VIN = 100mVp-p
4 VIN = 50mVp-p
VIN = 25mVp-p
2
0
0.1
1 10
FREQUENCY (MHz)
100
TEMPERATURE ERROR vs.
DXP–DXN CAPACITANCE
20
VCC = 5V
10
0
0
20 40 60 80
DXP–DXN CAPACITANCE (nF)
100
STANDBY SUPPLY CURRENT
vs. CLOCK FREQUENCY
50
40
30
20 VCC = 5V
VCC = 3.3V
10
0
1
10 100
SMBCLK FREQUENCY (kHz)
1000
STANDBY SUPPLY CURRENT
vs. SUPPLY VOLTAGE
100
ADD0, ADD1 = GND
60
20 ADD0, ADD1 = HIGH-Z
6
3
0
0
1234
SUPPLY VOLTAGE (V)
5
OPERATING SUPPLY CURRENT
vs. CONVERSION RATE
500
VCC = 5V
AVERAGED MEASUREMENTS
400
300
200
100
0
0 0.0625 0.125 0.25 0.5 1 2 4 8
CONVERSION RATE (Hz)
INTERNAL DIODE
RESPONSE TO THERMAL SHOCK
125
100
75
50
25
16-QSOP IMMERSED
IN +115°C FLUORINERT BATH
0
-2 0 2 4 6 8 10
TIME (sec)
_______________________________________________________________________________________ 5
5 Page 
Remote/Local Temperature Sensor with Dual-
Alarm Outputs and SMBus Serial Interface
tems, since a second master could overwrite the com-
mand byte without informing the first master.
The temperature data format is 7 bits plus sign in two’s
complement form for each channel, with each data bit rep-
resenting 1°C (Table 2), transmitted MSB first. Measure-
ments are offset by +1/2°C to minimize internal rounding
errors; for example, +99.6°C is reported as +100°C.
Alarm Threshold Registers
Two registers store ALERT threshold limits, with high-
temperature (THIGH) and low-temperature (TLOW) reg-
isters for the remote A/D channel. There are no
comparison registers for the local A/D channel. If either
measured temperature equals or exceeds the corre-
sponding alarm threshold value, an ALERT interrupt is
asserted. The power-on-reset (POR) state of the THIGH
register is full scale (0111 1111, or +127°C). The POR
state of the TLOW register is 1100 1001 or -55°C.
Two additional alarm threshold registers control the
OVERT output (see OVERT Alarm Output section), TMAX
and THYST. The POR state of TMAX is +100°C, and
THYST is +95°C.
OVERT Alarm Output for Fan Control
The OVERT output is an unlatched open-drain output that
behaves as a thermostat to control a fan (Figure 4). When
using the SMBus interface, the polarity of the OVERT pin
(active-low at POR) can be inverted via bit 5 in the config-
uration byte. OVERT’s current state can be read in the
status byte.
OVERT can also be used to control a fan without system
intervention. OVERT goes low when the remote tempera-
ture rises above TMAX and won’t go high again until the
temperature drops below THYST. The power-up default
settings for TMAX and THYST (+100°C and +95°C,
respectively) allow the MAX1619 to be used in stand-
alone thermostat applications where connection to an
SMBus serial bus isn’t required.
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 VCC - 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.
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 0111
1 100 1001
1 100 1001
1 011 1111
1 011 1111
+3V TO +5.5V
SMBUS
SERIAL
INTERFACE
(TO HOST)
STBY VCC
MAX1619
SMBCLK
SMBDATA
ALERT
DXP
+12V
2N3904
DXN
ADD0
OVERT
ADD1
GND
PGND
Figure 4. Fan Control Application
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet MAX1619.PDF ] | |
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