|
|
PDF MAX1617A Data sheet ( Hoja de datos )
| Número de pieza | MAX1617A | |
| Descripción | Remote/Local Temperature Sensor with SMBus Serial Interface | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX1617A (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
|
No Preview Available !
19-4508; Rev 0; 1/99
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
Remote/Local Temperature Sensor
with SMBus Serial Interface
________________General Description
The MAX1617A (patents pending) is a precise digital ther-
mometer that reports the temperature of both a remote
sensor and its own package. The remote sensor is a
diode-connected transistor—typically a low-cost, easily
mounted 2N3904 NPN type—that replaces conventional
thermistors or thermocouples. 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 MAX1617A is nearly identical to the popular MAX1617,
but has improved SMBus timing specifications, improved
bus collision immunity, software manufacturer and device
identification available via the serial interface, and a power-
on reset function that can force a reset of the slave address
via the serial interface.
________________________Applications
Desktop and Notebook
Computers
Central Office
Telecom Equipment
Smart Battery Packs
Test and Measurement
LAN Servers
Multichip Modules
Industrial Controls
___________________Pin Configuration
TOP VIEW
N.C. 1
VCC 2
DXP 3
DXN 4
N.C. 5
ADD1 6
GND 7
GND 8
MAX1617A
16 N.C.
15 STBY
14 SMBCLK
13 N.C.
12 SMBDATA
11 ALERT
10 ADD0
9 N.C.
QSOP
SMBus is a registered trademark of Intel Corp.
____________________________Features
o Two Channels: Measures Both Remote and Local
Temperatures
o No Calibration Required
o SMBus 2-Wire Serial Interface
o Programmable Under/Overtemperature Alarms
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 Small 16-Pin QSOP Package
Ordering Information
PART*
TEMP. RANGE
MAX1617AMEE -55°C to +125°C
*U.S. and foreign patents pending.
PIN-PACKAGE
16 QSOP
2N3904
Typical Operating Circuit
0.1µF
3V TO 5.5V
200Ω
VCC STBY
MAX1617A
DXP SMBCLK
SMBDATA
DXN
2200pF
ALERT
ADD0 ADD1 GND
10k EACH
CLOCK
DATA
INTERRUPT
TO µC
†Patents Pending
________________________________________________________________ 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 SMBus Serial Interface
____________________________Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
TEMPERATURE ERROR vs.
COMMON-MODE NOISE FREQUENCY
30
VIN = SQUARE WAVE
AC COUPLED TO DXN
VIN = 100mVp-p
20
TEMPERATURE ERROR vs.
DIFFERENTIAL-MODE NOISE FREQUENCY
5
TEMPERATURE ERROR vs.
DIFFERENTIAL-MODE NOISE FREQUENCY
10
VIN = 10mVp-p SQUARE WAVE
APPLIED TO DXP-DXN
5
0
10 VIN = 50mVp-p
VIN = 25mVp-p
0
50 500 5k 50k 500k 5M
FREQUENCY (Hz)
TEMPERATURE ERROR vs.
DXP–DXN CAPACITANCE
20
VCC = 5V
50M
10
VIN = 3mVp-p SQUARE WAVE
APPLIED TO DXP-DXN
-5
50 500 5k 50k 500k 5M 50M
FREQUENCY (Hz)
STANDBY SUPPLY CURRENT
vs. CLOCK FREQUENCY
35
SMBCLK IS
30 DRIVEN RAIL-TO-RAIL®
25
VCC = 5V
20
15
10
VCC = 3.3V
5
0
-5
50
100
60
500 5k 50k 500k 5M
FREQUENCY (Hz)
STANDBY SUPPLY CURRENT
vs. SUPPLY VOLTAGE
50M
ADD0, ADD1
= GND
20 ADD0, ADD1
= HIGH-Z
6
3
0
0
20 40 60 80
DXP–DXN CAPACITANCE (nF)
100
0
1k
OPERATING SUPPLY CURRENT
vs. CONVERSION RATE
500
VCC = 5V
AVERAGED MEASUREMENTS
400
10k 100k
SMBCLK FREQUENCY (Hz)
1000k
0
0
1234
SUPPLY VOLTAGE (V)
5
RESPONSE TO THERMAL SHOCK
125
100
300 75
200 50
100
0
0 0.0625 0.125 0.25 0.5 1 2 4 8
CONVERSION RATE (Hz)
Rail-to Rail is a registered trademark of Nippon Motorola, Ltd.
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 SMBus Serial Interface
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
-26
-55
-55
-65
-65
DIGITAL OUTPUT
DATA BITS
SIGN
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
MSB
111
111
111
111
001
000
000
000
000
000
111
111
110
110
100
100
011
011
LSB
1111
1111
1111
1110
1001
0001
0000
0000
0000
0000
1111
1111
0111
0110
1001
1001
1111
1111
Alarm Threshold Registers
Four registers store alarm threshold data, with high-
temperature (THIGH) and low-temperature (TLOW) reg-
isters for each A/D channel. If either measured
temperature equals or exceeds the corresponding
alarm threshold value, an ALERT interrupt is asserted.
The power-on-reset (POR) state of both THIGH registers
is full scale (0111 1111, or +127°C). The POR state of
both TLOW registers is 1100 1001 or -55°C.
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.
If the remote channel is shorted (DXP to DXN or DXP to
GND), the ADC reads 0000 0000 so as not to trip either
Table 3. Read Format for Alert Response
Address (0001100)
BIT
7
(MSB)
6
5
4
3
2
1
0
(LSB)
NAME
ADD7
ADD6
ADD5
ADD4
ADD3
ADD2
ADD1
1
FUNCTION
Provide the current MAX1617A
slave address that was latched at
POR (Table 8)
Logic 1
the THIGH or TLOW alarms at their POR settings. In
applications that are never subjected to 0°C in normal
operation, a 0000 0000 result can be checked to indi-
cate a fault condition in which DXP is accidentally short
circuited. Similarly, if DXP is short circuited to VCC, the
ADC reads +127°C for both remote and local channels,
and the device alarms.
ALERT Interrupts
The ALERT interrupt output signal is latched and can
only be cleared by reading the Alert Response address.
Interrupts are generated in response to THIGH and TLOW
comparisons and when the remote diode is disconnect-
ed (for continuity fault detection). The interrupt does not
halt automatic conversions; new temperature data con-
tinues to be available over the SMBus interface after
ALERT is asserted. The interrupt output pin is open-drain
so that devices can share a common interrupt line. The
interrupt rate can never exceed the conversion rate.
The interface responds to the SMBus Alert Response
address, an interrupt pointer return-address feature
(see Alert Response Address section). Prior to taking
corrective action, always check to ensure that an inter-
rupt is valid by reading the current temperature.
Alert Response Address
The SMBus Alert Response interrupt pointer provides
quick fault identification for simple slave devices that
lack the complex, expensive logic needed to be a bus
master. Upon receiving an ALERT interrupt signal, the
host master can broadcast a Receive Byte transmission
to the Alert Response slave address (0001 100). Then
any slave device that generated an interrupt attempts
to identify itself by putting its own address on the bus
(Table 3).
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MAX1617A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX1617 | SMBus Temperature Sensor with Internal and External Diode Input |  ON Semiconductor |
| MAX1617 | Remote/Local Temperature Sensor with SMBus Serial Interface | Maxim Integrated |
| MAX1617A | Remote/Local Temperature Sensor with SMBus Serial Interface | Maxim Integrated |
| MAX1617AMEE | Remote/Local Temperature Sensor with SMBus Serial Interface | Maxim Integrated |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |