Rainbow Electronics MAX6677 - Manual

General Description
The MAX6676/MAX6677 are high-accuracy, low-power
temperature sensors with a single-wire output. The
MAX6676/MAX6677 convert the ambient temperature
into a ratiometric PWM output with temperature informa-
tion contained in the duty cycle of the output square
wave. The MAX6676 has an open-drain output and the
MAX6677 has a push-pull output.
The MAX6676/MAX6677 are specified for operation
with power-supply voltages from 1.8V to 3.6V, or from
3.6V to 5.5V. The typical unloaded supply current is
80µA. All devices feature a single-wire output that mini-
mizes the number of pins necessary to interface with a
microprocessor (µP). The output is a square wave with
a nominal frequency of 1.8kHz (±20%) at +25°C. The
output format is decoded as follows:
Temperature (°C) = 398.15 ✕ (t
1
/ t
2
) - 273.15
Where t 1 is fixed with a typical value of 0.24ms and t 2 is
modulated by the temperature. The MAX6676/
MAX6677 operate from -40°C to +125°C and are avail-
able in space-saving 6-pin SOT23 packages.
Applications
Process Control
Industrial
HVAC and Environmental Control
Automotive
Portable Devices
µP and µC Temperature Monitoring
Isolated Temperature Sensing
Features
♦ Simple Single-Wire, 1.8kHz PWM Output
♦ Operates Down to 1.8V
♦ High Accuracy
±1.5°C at T
A
= +25°C
±3.0°C at T A = 0°C to +85°C
♦ Operates from -40°C to +125°C
♦ Low 80µA Typical Current Consumption
♦ Small 6-Pin SOT23 Package
MAX6676/MAX6677
Low-Voltage, 1.8kHz PWM Output Temperature
Sensors
________________________________________________________________ Maxim Integrated Products 1
GND
GND V
CC
1 6 GND
5 GND
DOUT
MAX6676
MAX6677
SOT23
TOP VIEW
2
3 4
Pin Configuration
Ordering Information
V CC
V CC
*REQUIRED ONLY FOR MAX6676.
5.1k Ω*
GND
DOUT
µC
INPUT TO
TIMER/COUNTER
MAX6676 t 2
t 1
0.1 µF
Typical Operating Circuit
19-2660; Rev 0; 10/02
*Future product—contact factory for availability.
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
PIN-
PACKAGE
MAX6676AUT3-T -40°C to +125°C 6 SOT23-6
MAX6676AUT5-T* -40°C to +125°C 6 SOT23-6
MAX6677AUT3-T* -40°C to +125°C 6 SOT23-6
MAX6677AUT5-T* -40°C to +125°C 6 SOT23-6
PART
OUTPUT
TYPE
SUPPLY
VOLTAGE
RANGE (V)
TOP
MARK
MAX6676AUT3 Open drain 1.8 to 3.6 ABBF
MAX6676AUT5 Open drain 3.6 to 5.5 ABBG
MAX6677AUT3 Push-pull 1.8 to 3.6 ABBH
MAX6677AUT5 Push-pull 3.6 to 5.5 ABBI
Selector Guide