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PDF MAX6681 Data sheet ( Hoja de datos )
| Número de pieza | MAX6681 | |
| Descripción | (MAX6680 / MAX6681) Fail-Safe Remote/Local Temperature Sensors | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-2305; Rev 0; 4/02
±1°C Fail-Safe Remote/Local Temperature
Sensors with SMBus Interface
General Description
The MAX6680/MAX6681 are precise, two-channel digi-
tal thermometers. Each accurately measures the tem-
perature of its own die and one remote PN junction and
reports the temperature on a 2-wire serial interface. The
remote junction can be a diode-connected transistor
like the low-cost NPN type 2N3904 or PNP type
2N3906. The remote junction can also be a common-
collector PNP, such as a substrate PNP of a micro-
processor.
The MAX6680/MAX6681 include pin-programmable
default temperature thresholds for the OVERT output,
which provides fail-safe clock throttling or system shut-
down. In addition, the devices are pin programmable to
select whether the OVERT output responds to either the
local, remote, or both temperatures.
The 2-wire serial interface accepts standard System
Management Bus (SMBus)™ commands such as Write
Byte, Read Byte, Send Byte, and Receive Byte to read
the temperature data and program the alarm thresholds
and conversion rate. The MAX6680/MAX6681 can func-
tion autonomously with a programmable conversion
rate, which allows the control of supply current and
temperature update rate to match system needs. For
conversion rates of 4Hz or less, the remote sensor tem-
perature can be represented in extended mode as 10
bits + sign with a resolution of 0.125°C. When the con-
version rate is 8Hz, output data is 7 bits + sign with a
resolution of 1°C. The MAX6680/MAX6681 also include
an SMBus timeout feature to enhance system reliability.
The MAX6681 is an upgrade to the MAX6654. The
MAX6680/MAX6681 remote accuracy is ±1°C with no
calibration needed. They are available in a 16-pin
QSOP package and operate throughout the -55°C to
+125°C temperature range.
Applications
Desktop Computers
Notebook
Computers
Servers
Thin Clients
Workstations
Pin Configurations appear at end of data sheet.
Features
o Two Alarm Outputs: ALERT and OVERT
o Pin-Programmable Threshold for OVERT Limit
o Programmable Under/Overtemperature ALERT
Limit
o Dual Channel: Measures Remote and Local
Temperature
o 11-Bit, 0.125°C Resolution for Remote Temperature
Measurements
o High Accuracy ±1°C (max) from +60°C to +100°C
(Remote)
o No Calibration Required
o SMBus/I2C™-Compatible Interface
o SMBus Timeout Prevents SMBus Lockup
PART
MAX6680MEE
MAX6681MEE
Ordering Information
TEMP RANGE
-55°C to +125°C
-55°C to +125°C
PIN-PACKAGE
16 QSOP
16 QSOP
Typical Operating Circuit
0.1µF
200Ω 3.3V
DXP VCC STBY
SMBDATA
MICROPROCESSOR
2200pF
DXN
MAX6680
MAX6681
SENS_SEL
INT_SEL
ADD0
SMBCLK
ALERT
RESET
OVERT
ADD1 GND CRIT0 CRIT1
10kΩ
EACH
DATA
CLOCK
INTERRUPT
TO µP
TO SYSTEM
SHUTDOWN
SMBus is a trademark of Intel Corp.
I2C is a trademark of Philips Corp.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
±1°C Fail-Safe Remote/Local Temperature
Sensors with SMBus Interface
PIN
MAX6680
MAX6681
12
2, 5 1, 5
33
44
66
77
88
99
10 10
11 11
12 12
13 13
14 14
15 15
16 16
Pin Description
NAME
VCC
CRIT1,
CRIT0
DXP
DXN
ADD1
RESET
GND
OVERT
ADD0
ALERT
SMBDATA
INT_SEL
SMBCLK
STBY
SENS_SEL
FUNCTION
Supply Voltage Input, 3V to 5.5V. Bypass VCC 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.
Hardware-Programmable Default Alarm Threshold for OVERT Limits. Use Table
4 to set default temperatures.
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.
Combined Remote-Diode Current Sink and A/D Negative Input. DXN is
internally biased to one diode drop above ground.
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.
Reset Input. Drive RESET high to set all registers to their default values (POR
state). Drive RESET low or leave floating for normal operation.
Ground
Overtemperature Active-Low Output. Open drain.
SMBus Slave Address Select Pin (see ADD1).
SMBus Alert (Interrupt) Active-Low Output. Open drain.
SMBus Serial-Data Input/Output, Open Drain
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.
SMBus Serial-Clock Input
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.
High = Local, Low = Remote, Open = Local and Remote
_______________________________________________________________________________________ 5
5 Page 
±1°C Fail-Safe Remote/Local Temperature
Sensors with SMBus Interface
AB
C D EF
tLOW tHIGH
SMBCLK
G
H I JK
LM
SMBDATA
tSU:STA tHD:STA
tSU:DAT
tHD: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
Figure 4. SMBus Write Timing Diagram
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO SLAVE
H = LSB OF DATA CLOCKED INTO SLAVE
I = MASTER PULLS DATA LINE LOW
tSU:STO tBUF
J = ACKNOWLEDGE CLOCKED INTO SLAVE
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION
M = NEW START CONDITION
AB
C D EF
tLOW tHIGH
SMBCLK
G
H I JK
LM
SMBDATA
tSU:STA tHD:STA
tSU:DAT
tHD:DAT
tSU:STO tBUF
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
Figure 5. SMBus Read Timing Diagram
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
J = ACKNOWLEDGE CLOCKED INTO SLAVE
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION
M = NEW START CONDITION
ture returns within the limits. An open diode also sets
this output.
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 (see the Slave
Addresses section). Then, any slave device that gener-
ated an interrupt, attempts to identify itself by putting its
own address on the bus (Table 4).
The Alert Response can activate several different slave
devices simultaneously, similar to the I2C General Call.
If more than one slave attempts to respond, bus arbitra-
tion rules apply, and the device with the lower address
code wins. The losing device does not generate an
acknowledge and continues to hold the ALERT line low
until cleared. (The conditions for clearing an alert vary
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet MAX6681.PDF ] | |
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