MAX6577ZUT(1999) Ver la hoja de datos (PDF) - Maxim Integrated
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MAX6577ZUT Datasheet PDF : 8 Pages
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SOT Temperature Sensors with
Period/Frequency Output
Pin Description
PIN
NAME
FUNCTION
1
VDD
Positive Supply Voltage
2
GND
Ground
3
N.C.
No Connection. Connect pin to GND or leave open.
4, 5
TS1, TS0
Time-Select Pins. TS1 and TS0 set the temperature scale factor by connecting TS1 and TS0 to
either VDD or GND. See Tables 1 and 2.
Square-Wave Output with a Clock Period Proportional to Absolute Temperature (°K) (MAX6576)
6
OUT
Square-Wave Output with a Clock Frequency Proportional to Absolute Temperature (°K) (MAX6577)
Table 1. MAX6576 Time-Select Pin
Configuration
TS1
GND
GND
VDD
VDD
TS0
GND
VDD
GND
VDD
SCALAR MULTIPLIER
(µs/°K)
10
40
160
640
Note: The temperature, in °C, may be calculated as follows:
T(°C) =
period(µs)
− 273.15°K
scalar mulitplier(µs/°K)
Table 2. MAX6577 Time-Select Pin
Configuration
TS1
GND
GND
VDD
VDD
TS0
GND
VDD
GND
VDD
SCALAR MULTIPLIER
(Hz/°K)
4
1
1/4
1/16
Note: The temperature, in °C, may be calculated as follows:
T(°C) =
frequency(Hz)
− 273.15°K
scalar mulitplier(Hz/°K)
Detailed Description
The MAX6576/MAX6577 low-cost, low-current (140µA
typ) temperature sensors are ideal for interfacing with
microcontrollers (µCs) or microprocessors (µPs). The
MAX6576 converts ambient temperature into a 50% duty-
cycle square wave with a period proportional to absolute
temperature. The MAX6577 converts ambient tempera-
ture into a 50% duty-cycle square wave with a frequency
proportional to absolute temperature. Time-select pins
(TS1, TS0) permit the internal temperature-controlled
oscillator (TCO) to be scaled by four preset multipliers.
The MAX6576/MAX6577 feature a single-wire interface to
minimize the number of port pins necessary for interfac-
ing with a µP.
MAX6576 Characteristics
The MAX6576 temperature sensor converts tempera-
ture to period. The output of the device is a free-
running, 50% duty-cycle square wave with a period that
is proportional to the absolute temperature (°K) of the
device (Figure 1). The MAX6576 has a push/pull CMOS
output with sharp edges. The speed of the output
square wave can be selected by hard-wiring TS1 and
TS0 as shown in Table 1. One of four scaled output
periods can be selected using TS1 and TS0.
MAX6577 Characteristics
The MAX6577 temperature sensor converts tempera-
ture to frequency. The output of the device is a free-
running, 50% duty-cycle square wave with a frequency
that is proportional to the absolute temperature (°K) of
the device (Figure 2). The MAX6577 has a push/pull
CMOS output with sharp edges. The speed of the out-
put square wave can be selected by hard-wiring TS1
and TS0 as shown in Table 2. One of four scaled output
frequencies can be selected using TS1 and TS0.
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