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Part: MAX1755AAUT-T
Category:
Power Management
-> Battery Management
Description: MAX1755, MAX1756 SOT23 Local Temperature Comparators With Smbus Serial Interface
Company: Maxim Integrated Products
Datasheet: Download MAX1755AAUT-T datasheet File size : 573 kB
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Datasheet text preview:
19-1852; Rev 1; 3/01
SOT23 Local Temperature Comparators with SMBus Serial Interface
General Description
The MAX1755/MAX1756 are temperature monitors with ±3°C accuracy, each with a built-in comparator and SMBusTM-controlled variable trip threshold. This DACprogrammable threshold allows specific thermal zones and system responses to overtemperature conditions to b e adjusted under software control. The MAX1755/ MAX1756 feature serial programmability, low cost, wide supply-voltage range, and a tiny package. The MAX1755 has a self-clearing thermostat output (OVERT), and the MAX1756 has a latched interrupt output (ALERT). A variety of slave addresses allow for up to six devices per system (Table 3). The MAX1755 has 4°C of built-in hysteresis. The MAX1756 detects both low-to-high and high-to-low temperature transitions within an 8°C temperature window. T h i s arrangement supports "windowing" algorithms where the comparison threshold is reprogrammed "onthe-fly." The MAX1755/MAX1756 are offered in the 6-pin SOT23 package and are specified over the -40°C to +125°C temperature range. For other temperature sensors with SMBus interfaces, refer to the MAX1617, MAX1618, MAX1668, and MAX1805 data sheets. o Built-In Hysteresis o SMBus 2-Wire Serial Interface o OVERT Thermostat Output (MAX1755) o ALERT Interrupt Output (MAX1756) o Threshold Accuracy ±3°C (+25°C to +100°C) ±5°C (0°C to +125°C) o 200µA (max) Supply Current o +2.375V to +5.5V Supply Range o Tiny 6-Pin SOT23 Package
Features
o Programmable Temperature Threshold
MAX1755/MAX1756
Ordering Information
PART* MAX1755AAUT-T MAX1755BAUT-T MAX1756AAUT-T MAX1756BAUT-T TEMP RANGE -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C PINPACKAGE 6 SOT23-6 6 SOT23-6 6 SOT23-6 6 SOT23-6 TOP MARK AANM AANL AANO AANL
________________________Applications
Local Temperature Monitoring Desktop Computers Notebook Computers Servers Workstations Memory Modules Multichip Modules Industrial Control Systems Automotive
*A and B suffixes on these devices select different combinations of slave addresses. See Table 3 to determine the appropriate suffix. Note: Requires a special solder temperature profile described in the Absolute Maximum Ratings section.
Typical Operating Circuit
0.1µF +2.375V TO +5.5V
VCC MAX1755 MAX1756 SMBCLK SMBDATA OVERT (ALERT)
10k EACH
CLOCK DATA INTERRUPT TO µC
Pin Configurations appear at end of data sheet. SMBus is a trademark of Intel Corp.
( ) ARE FOR MAX1756 ONLY.
ADD
GND
________________________________________________________________ Maxim Integrated Products
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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.
SOT23 Local Temperature Comparators with SMBus Serial Interface MAX1755/MAX1756
ABSOLUTE MAXIMUM RATINGS (Note 1)
VCC to GND .....-0.3V to +6V ADD to GND .....-0.3V to (VCC + 0.3V) SMBCLK, SMBDATA, ALERT, OVERT to GND ........-0.3V to +6V SMBDATA, ALERT, OVERT Current...........-1mA to +50mA Continuous Power Dissipation (TA = +70°C) 6-Pin SOT23 (derate 9.1mW/°C above +70°C)...727mW Operating Temperature Range (extended) .......-40°C to +125°C Junction Temperature ......+150°C Storage Temperature Range .....-65°C to +150°C
Note 1: This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile to which the device can be exposed during board-level solder attach and rework. The limit permits the use of only the solder profiles recommended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and Convection reflow. Preheating is required. Hand or wave soldering is not allowed.
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = +3.3V, TA = 0°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER TEMPERATURE COMPARATOR AND POWER SUPPLY DAC Resolution (Note 3) Temperature Comparison Error Temperature Hysteresis Temperature Window Sampling Frequency Supply Voltage Range Undervoltage Lockout Threshold Undervoltage Lockout Hysteresis Power-On Reset Threshold Operating Supply Current Standby Supply Current ADD Input High Voltage ADD Input Low Voltage SMBus INTERFACE Logic Input High Voltage Logic Input Low Voltage SMBus Output Low Sink Current ALERT, OVERT Output Low Sink Current ALERT, OVERT Output High Leakage Current Logic Input Current (ADD, SMBCLK, SMBDATA) SMBus Input Capacitance SMBus Clock Frequency SMBCLK Clock Low Time SMBCLK Clock High Time SMBus Rise Time SMBCLK, SMBDATA; VCC = 2.7V to 5.5V SMBCLK, SMBDATA; VCC = 2.7V to 5.5V SMBDATA forced to 0.4V; VCC = 2.7V to 5.5V Pin forced to 0.4V Pin forced to 5.5V Inputs forced to VCC or GND SMBCLK, SMBDATA (Note 4) tLOW, 10% to 10% points, VCC = 2.7V to 5.5V tHIGH, 90% to 90% points, VCC = 2.7V to 5.5V SMBCLK, SMBDATA; 10% to 90% points, VCC = 2.7V to 5.5V DC 4.7 4 1 -1 5 100 6 6 1 +1 2.1 0.8 V V mA mA µA µA pF kHz µs µs µs VCC, falling edge SMBus static, logic inputs forced to VCC or GND SMBus static, logic inputs forced to VCC or GND 0.8 x VCC 0.2 x VCC 0.2 VCC input, rising edge Monotonicity guaranteed TA = +25 C to +100 C TA = 0oC to +125oC With respect to temperature comparison value (MAX1755) Lower threshold with respect to temperature comparison value (MAX1756)
o o
CONDITIONS
MIN 2 -3 -5 -4.5 -9 0.50 2.375 2.05
TYP
MAX
UNITS
o
C C
+3 +5 -4 -8 1 2.2 30 1.7 85 0.8 2.3 200 4 -3.5
o
o
C
-7 2.00 5.5 2.35 kHz V V mV V µA µA V V
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SOT23 Local Temperature Comparators with SMBus Serial Interface
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3.3V, TA = 0°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER SMBus Fall Time SMBus Start Condition Setup Time SMBus Repeated Start Condition Setup Time SMBus Start Condition Hold Time SMBus Stop Condition Setup Time SMBus Data Valid to SMBCLK Rising-Edge Time SMBus Data Hold Time (Master Transmitter) SMBus Data Hold Time (Slave Transmitter) CONDITIONS SMBCLK, SMBDATA; 90% to 10% points, VCC = 2.7V to 5.5V VCC = 2.7V to 5.5V tSU:STA, 90% to 90% points, VCC = 2.7V to 5.5V tHD:STA, 10% of SMBDATA to 90% of SMBCLK, VCC = 2.7V to 5.5V tSU:STO, 90% of SMBCLK to 10% of SMBDATA; VCC = 2.7V to 5.5V tSU:DAT, 10% or 90% of SMBDATA to 10% of SMBCLK; VCC = 2.7V to 5.5V tHD:DAT, VCC = 2.7V to 5.5V tHD:DAT, VCC = 2.7V to 5.5V 4.7 250 4 4 250 0 300 MIN TYP MAX 300 UNITS ns µs ns µs µs ns µs ns
MAX1755/MAX1756
ELECTRICAL CHARACTERISTICS
(VCC = +3.3V, TA = -40°C to +125°C, unless otherwise noted.) (Note 2)
PARAMETER TEMPERATURE COMPARATOR AND POWER SUPPLY DAC Resolution (Note 3) Temperature Comparison Error Temperature Hysteresis Temperature Window Supply Voltage Range Operating Supply Current SMBus INTERFACE SMBus Output Low Sink Current ALERT, OVERT Output Low Sink Current ALERT, OVERT Output High Leakage Current SMBDATA forced to 0.4V; VCC = 2.7V to 5.5V Pin forced to 0.4V Pin forced to 5.5V 6 6 1 mA mA µA SMBus static, logic inputs forced to VCC or GND With respect to temperature comparison value (MAX1755) Lower threshold with respect to temperature comparison value (MAX1756) Monotonicity guaranteed 2 -5 -4.5 -9 2.375 +5 -3.5
o o o
CONDITIONS
MIN
TYP
MAX
UNITS C C
C
-7 5.5 200 V µA
Note 2: Limits are 100% production tested at TA = +25°C. Limits over operating temperature are guaranteed by design. Note 3: Guaranteed, but not 100% tested. Note 4: The SMBus logic block is a static design that works with clock frequencies down to DC. While slow operation is possible, it violates the 10kHz minimum clock frequency and SMBus specifications and may monopolize the bus.
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