Pin description detailed description – Rainbow Electronics MAX6577 User Manual

Page 4

Table 1. MAX6576 Time-Select Pin
Configuration

Table 2. MAX6577 Time-Select Pin
Configuration

MAX6576/MAX6577

SOT Temperature Sensors with
Period/Frequency Output

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Pin Description

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.

GND

160

640

TS1

TS0

SCALAR MULTIPLIER

(µs/°K)

Note:

The temperature, in °C, may be calculated as follows:

GND

1/4

TS1

TS0

SCALAR MULTIPLIER

(Hz/°K)

1/16

Positive Supply Voltage

Ground

No Connection. Connect pin to GND or leave open.

FUNCTION

4, 5

Time-Select Pins. TS1 and TS0 set the temperature scale factor by connecting TS1 and TS0 to
either V

or GND. See Tables 1 and 2.

PIN

N.C.

GND

NAME

TS1, TS0

Note:

The temperature, in °C, may be calculated as follows:

T( C)

period( s)

scalar mulitplier( s/ K)

273.15 K

−

T( C)

frequency(Hz)

scalar mulitplier(Hz/ K)

273.15 K

−

Square-Wave Output with a Clock Frequency Proportional to Absolute Temperature (°K) (MAX6577)

OUT

Square-Wave Output with a Clock Period Proportional to Absolute Temperature (°K) (MAX6576)