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PDF MAX6695 Data sheet ( Hoja de datos )
| Número de pieza | MAX6695 | |
| Descripción | Dual Remote/Local Temperature Sensors | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3183; Rev 1; 5/04
www.DataSheet4U.com
Dual Remote/Local Temperature Sensors with
SMBus Serial Interface
General Description
The MAX6695/MAX6696 are precise, dual-remote, and
local digital temperature sensors. They accurately mea-
sure the temperature of their own die and two remote
diode-connected transistors, and report the tempera-
ture in digital form on a 2-wire serial interface. The
remote diode is typically the emitter-base junction of a
common-collector PNP on a CPU, FPGA, GPU, or ASIC.
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 MAX6695/MAX6696 can func-
tion autonomously with a programmable conversion
rate, which allows control of supply current and temper-
ature update rate to match system needs. For conver-
sion rates of 2Hz or less, the temperature is
represented as 10 bits + sign with a resolution of
+0.125°C. When the conversion rate is 4Hz, output data
is 7 bits + sign with a resolution of +1°C. The MAX6695/
MAX6696 also include an SMBus timeout feature to
enhance system reliability.
Remote temperature sensing accuracy is ±1.5°C be-
tween +60°C and +100°C with no calibration needed.
The MAX6695/MAX6696 measure temperatures from
-40°C to +125°C. In addition to the SMBus ALERT out-
put, the MAX6695/MAX6696 feature two overtempera-
ture limit indicators (OT1 and OT2), which are active
only while the temperature is above the corresponding
programmable temperature limits. The OT1 and OT2
outputs are typically used for fan control, clock throt-
tling, or system shutdown.
The MAX6695 has a fixed SMBus address. The
MAX6696 has nine different pin-selectable SMBus
addresses. The MAX6695 is available in a 10-pin
µMAX® and the MAX6696 is available in a 16-pin QSOP
package. Both operate throughout the -40°C to +125°C
temperature range.
Applications
Notebook Computers
Desktop Computers
Servers
Workstations
Test and Measurement Equipment
SMBus is a trademark of Intel Corp.
I2C is a trademark of Philips Corp. Purchase of I2C components
from Maxim Integrated Products, Inc., or one of its sublicensed
Associated Companies, conveys a license under the Philips
I2C Patent Rights to use these components in an I2C system,
provided that the system conforms to the I2C Standard
Specification as defined by Philips.
Features
♦ Measure One Local and Two Remote
Temperatures
♦ 11-Bit, 0.125°C Resolution
♦ High Accuracy ±1.5°C (max) from +60°C to +100°C
(Remote)
♦ ACPI Compliant
♦ Programmable Under/Overtemperature Alarms
♦ Programmable Conversion Rate
♦ Three Alarm Outputs: ALERT, OT1, and OT2
♦ SMBus/I2C™-Compatible Interface
PART
MAX6695AUB
MAX6696AEE
Ordering Information
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
10 µMAX
16 QSOP
Typical Operating Circuit
0.1µF
+3.3V
47Ω
CPU VCC
DXP1
SMBDATA
SMBCLK
MAX6695 ALERT
DXN OT1
OT2
10kΩ
EACH
DATA
CLOCK
INTERRUPT
TO µP
TO CLOCK
THROTTLING
TO SYSTEM
SHUTDOWN
DXP2
GND
GRAPHICS
PROCESSOR
Typical Operating Circuits continued at end of data sheet.
Pin Configurations appear at end of data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________ 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  
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Dual Remote/Local Temperature Sensors with
SMBus Serial Interface
PIN
MAX6695
MAX6696
12
23
34
45
5 10
68
79
8 11
9 12
10 13
— 1, 16
—6
—7
— 14
— 15
Pin Description
NAME
VCC
DXP1
DXN
DXP2
OT1
GND
SMBCLK
ALERT
SMBDATA
OT2
N.C.
ADD1
RESET
ADD0
STBY
FUNCTION
Supply Voltage Input, +3V to +3.6V. Bypass to GND with a 0.1µF capacitor. A
47Ω series resistor is recommended but not required for additional noise
filtering. See Typical Operating Circuit.
Combined Remote-Diode Current Source and A/D Positive Input for Remote-
Diode Channel 1. DO NOT LEAVE DXP1 FLOATING; connect DXP1 to DXN if no
remote diode is used. Place a 2200pF capacitor between DXP1 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.
Combined Remote-Diode Current Source and A/D Positive Input for Remote-
Diode Channel 2. DO NOT LEAVE DXP2 FLOATING; connect DXP2 to DXN if no
remote diode is used. Place a 2200pF capacitor between DXP2 and DXN for
noise filtering.
Overtemperature Active-Low Output, Open Drain. OT1 is asserted low only when
the temperature is above the programmed OT1 threshold.
Ground
SMBus Serial-Clock Input
SMBus Alert (Interrupt) Active-Low Output, Open-Drain. Asserts when
temperature exceeds user-set limits (high or low temperature) or when a remote
sensor opens. Stays asserted until acknowledged by either reading the status
register or by successfully responding to an alert response address. See the
ALERT Interrupts section.
SMBus Serial-Data Input/Output, Open Drain
Overtemperature Active-Low Output, Open Drain. OT2 is asserted low only when
temperature is above the programmed OT2 threshold.
No Connect
SMBus Slave Address Select Input (Table 10). ADD0 and ADD1 are sampled
upon power-up.
Reset Input. Drive RESET high to set all registers to their default values (POR
state). Pull RESET low for normal operation.
SMBus Slave Address Select Input (Table 10). ADD0 and ADD1 are sampled
upon power-up.
Hardware Standby Input. Pull STBY low to put the device into standby mode.
All registers’ data are maintained.
_______________________________________________________________________________________ 5
5 Page 
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Dual Remote/Local Temperature Sensors with
SMBus Serial Interface
Table 5. Command-Byte Register Bit Assignments
REGISTER
RLTS
RRTE
RSL1
RCL
RCRA
RLHN
RLLI
RRHI
RRLS
WCA
WCRW
WLHO
WLLM
WRHA
WRLN
OSHT
REET
RIET
RSL2
RWO2E
RWO2I
RWO1E
RWO1I
ADDRESS
00 h
01 h
02 h
03 h
04 h
05 h
06 h
07 h
08 h
09 h
0A h
0B h
0C h
0D h
0E h
0F h
10 h
11 h
12 h
16 h
17 h
19 h
20 h
POR STATE
0000 0000
(0°C)
0000 0000
(0°C)
1000 0000
0000 0000
0000 0110
0100 0110
(+70°C)
1100 1001
(-55°C)
0100 0110
(+70°C)
1100 1001
(-55°C)
0010 0000
0000 0110
0100 0110
(+70°C)
1100 1001
(-55°C)
0100 0110
(+70°C)
1100 1001
(-55°C)
0000 0000
0000 0000
0000 0000
0000 0000
0111 1000
(+120°C)
0101 1010
(+90°C)
0101 1010
(+90°C)
0100 0110
(+70°C)
FUNCTION
Read internal temperature
Read external channel 1 temperature if bit 3 of configuration register is 0;
Read external channel 2 temperature if bit 3 of configuration register is 1
Read status register 1
Read configuration byte (fault queue should be disabled at startup)
Read conversion rate byte
Read internal ALERT high limit
Read internal ALERT low limit
Read external channel 1 ALERT high limit if bit 3 of configuration register is 0;
Read external channel 2 ALERT high limit if bit 3 of configuration register is 1
Read external channel 1 ALERT low limit if bit 3 of configuration register is 0;
Read external channel 2 ALERT low limit if bit 3 of configuration register is 1
Write configuration byte
Write conversion rate byte
Write internal ALERT high limit
Write internal ALERT low limit
Write external channel 1 ALERT high limit if bit 3 of configuration register is 0;
Write external channel 2 ALERT high limit if bit 3 of configuration register is 1
Write external channel 1 ALERT low limit if bit 3 of configuration register is 0;
Write external channel 2 ALERT low limit if bit 3 of configuration register is 1
One shot
Read extended temp of external channel 1 if bit 3 of configuration register is 0;
Read extended temp of external channel 2 if bit 3 of configuration register is 1
Read internal extended temperature
Read status register 2
Read/write external OT2 limit for channel 1 if bit 3 of configuration register is 0;
Read/write external OT2 limit for channel 2 if bit 3 of configuration register is 1
Read/write internal OT2 limit
Read/write external OT1 limit for channel 1 if bit 3 of configuration register is 0;
Read/write external OT1 limit for channel 2 if bit 3 of configuration register is 1
Read/write internal OT1 limit
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet MAX6695.PDF ] | |
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