Description

STTS751

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Doc ID 16483 Rev 5

1

Description

The STTS751 is a digital temperature sensor which communicates over a 2-wire SMBus 2.0

compatible bus. The temperature is measured with a user-configurable resolution between

9 and 12 bits. At 9 bits, the smallest step size is 0.5 °C, and at 12 bits, it is 0.0625 °C. At the

default resolution (10 bits, 0.25 °C/LSB), the conversion time is nominally 21 milliseconds.

The open-drain EVENT output is used to indicate an alarm condition in which the measured

temperature has exceeded the user-programmed high limit or fallen below the low limit.

When the EVENT pin is asserted, the host can respond using the SMBus Alert Response

Address (ARA) protocol to which the STTS751 will respond by sending its slave address.

The STTS751 is a 6-pin device that supports user-configurable slave addresses. Via the

pull-up resistor on the Addr/Therm pin, one of four different slave addresses can be

specified. Two order numbers (STTS751-0 and STTS751-1) provide two different sets of

slave addresses bringing the total available to eight. Thus, up to eight devices can share the

same 2-wire SMBus without ambiguity, thereby allowing monitoring of multiple temperature

zones in an application.

The two-wire interface can support transfer rates up to 400 kHz. Two small footprint

packages are available: a UDFN-6L and a standard SOT23-6L package.

Figure 1.

Logic diagram

1.

This pin may not float.

Table 2.

Signal names

Symbol

Type

Description

Addr/Therm

Output

Address selection pin / thermal status pin

EVENT

Output

Event (alert) output

SDA

I/O

SMBus interface data I/O

SCL

Input

SMBus interface clock input

Power

Device power supply

GND

Ground

Device ground

SDA

VDD

STTS751-0

GND

SCL

EVENT

(1)

Addr/Therm

STTS751-1

AM03028v1