Rainbow Electronics MAX6673 User Manual
General Description
The MAX6672/MAX6673 are low-current temperature
sensors with a single-wire output. These temperature
sensors convert the ambient temperature into a 1.4kHz
PWM output, which contains the temperature information in its duty cycle. The MAX6672 has an open-drain
output and the MAX6673 has a push-pull output.
The MAX6672/MAX6673 operate from 2.4V to 5.5V with
a maximum supply current of 150µA. Both devices feature a single-wire output that minimizes the number of
pins necessary to interface with a microprocessor.
The MAX6672/MAX6673 are available in 5-pin SC70
packages.
Applications
Industrial and Process Control
HVAC
Automotive
Environmental Control
Isolated Temperature Sensing
Features
♦ Simple Single-Wire PWM Output
♦ Tiny SC70 Package
♦ Low 60µA (typ) Supply Current Consumption
♦ 1.4kHz Nominal Frequency
♦ Choice of Outputs
Open Drain (MAX6672)
Push-Pull (MAX6673)
♦ 2.4V to 5.5V Supply Range
MAX6672/MAX6673
PWM Output Temperature Sensors
in SC70 Packages
________________________________________________________________ Maxim Integrated Products 1
Pin Configuration
V
CC
GND
GPIO TO CONTROL
SHUTDOWN
INPUT TO TIMER/
COUNTER
0.1µF
MAX6672
MAX6673
µC
*
* PULLUP RESISTOR REQUIRED ONLY FOR THE MAX6672.
Typical Application Circuit
19-2458; Rev 0; 10/02
Ordering Information
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.
PART TEMP RANGE
M A X6 6 7 2AX K- T -40°C to +125°C 5 SC70-5 ACQ
M A X6 6 7 3AX K- T -40°C to +125°C 5 SC70-5 ACR
PINPACKAGE
TOP
MARK
TOP VIEW
15V
DOUT
MAX6672
2
N.C.
MAX6673
34
SC70
CC
GNDGND
MAX6672/MAX6673
PWM Output Temperature Sensors
in SC70 Packages
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= 2.4V to 5.5V, TA= -40°C to +125°C, unless otherwise noted. Typical values specified at +25°C and VCCof 3.3V.) (Note 1)
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.
Note 1: All specifications are 100% tested at TA= +25°C. Specification limits over temperature (TA= -40°C to +125°C) are guaranteed
by design, not production tested.
Note 2: Temperature = -200
✕
(0.85 - T1/T2)3 + (425 ✕ T1/T2) - 273. T1 is the low time period. T2 is the high time period (Figure 1).
Supply Voltage (V
CC
to GND) ................................. -0.3V to +6V
DOUT to GND (MAX6672)........................................-0.3V to +6V
DOUT to GND (MAX6673)..........................-0.3V to (V
CC
+ 0.3V)
DOUT Short to GND ...................................................Continuous
ESD Protection (Human Body Model) ............................ ±2000V
Continuous Power Dissipation (T
A
= +70°C)
5-Pin SC70 (derate 2.5mW/°C above +70°C).............200mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature......................................................+150°C
SC70 Package
Vapor Phase (60s) ...................................................... +215°C
Infrared (15s). ............................................................. +220°C
Lead Temperature (soldering, 10s) ................................ +300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Temperature Error
(Note 2)
Nominal t1 Pulse Width 280 µs
Output Low Voltage V
Output High Voltage V
Fall Time t
Rise Time t
DOUT Open-Drain Leakage
Current
Output Capacitance 2.5 pF
Power-Supply Rejection Ratio PSRR 2.4V to 5.5V, TA = -25°C to +125°C 0.3 0.8 °C/V
Supply Current
= 3.3V
V
CC
OL
OH
FALL
RISE
I
CC
I
SINK
I
SOURCE
C
LOAD
C
LOAD
V
DOUT
2.4V to 3.6V
3.6V to 5.5V 70 150
= 3mA 0.4 V
= 800µA (MAX6673) VCC - 0.5 V
= 100pF 14 ns
= 100pF (MAX6673) 96 ns
= 6V (MAX6672) 0.1 µA
TA = +25°C to +100°C-3 +3
TA = 0°C to +125°C-4 +4
TA = -20°C to +125°C-5 +5
T
= -40°C to -20°C±3
A
60 100
°C
µA
Loading...