7 Detailed Description

7.1 Overview

The TMP9R01-SEP and TMP9R01-SP device is a digital temperature sensor that combines a local temperature

measurement channel and a remote-junction temperature measurement channel in a single VSSOP DGS-10

package. The device is two-wire- and SMBus-interface-compatible with nine pin-programmable bus address

options, and is specified over a temperature range of –55°C to 125°C. The TMP9R01-SEP and TMP9R01-SP

device also contains multiple registers for programming and holding configuration settings, temperature limits,

and temperature measurement results.

The TMP9R01-SEP and TMP9R01-SP requires only a transistor connected between D+ and D– for proper

remote temperature sensing operation. The SCL and SDA interface pins require pullup resistors as part of the

communication bus, while ALERT and THERM pins are open-drain outputs that require pullup resistors. ALERT

and THERM pins can be shared with other devices for a wired-OR implementation, if desired. TI recommends

using a 0.1µF power-supply bypass capacitor for good local bypassing. Figure 7-1 shows a typical configuration

for the TMP9R01-SEP and TMP9R01-SP.

GND

SDA

SCL

A1

D–

D+

ALERT/ THERM2

A0

V+

THERM

TMP9R01-SEP

6

7

8

9

10

1

2

3

4

5

SMBus

Controller

Host Processor

GND

TL1431-SP

or

LM4050QML-SP

TL1431-SP

or

LM4050QML-SP

Vbatt

Vbatt

GND

Overtemperature

Shutdown

1.7V to 3.6V

1.7V to 3.6V

GND

Built-in

Thermal

Transistor

or Diode

FPGA, ADC,

DAC, or ASIC

CDIFF

RS

RS

PNP Diode-connected configuration

(A):

CDIFF

RS

NPN Diode-connected configuration

(A):

Transistor-connected configuration

(A):

RS

CDIFF

RS

RS

(B)

(B)

(B)

(B)

(B)

(B)

(C)

(C)

(C)

Figure 7-1. Basic Connections

A.

Diode-connected configuration provides better settling time. Transistor-connected configuration provides better series resistance

cancellation. NPN transistors must be diode-connected. PNP transistors can either be transistor or diode-connected. For more

information on NPN/PNP transistors see Remote Temperature Sensor Transistor Selection Guide application note.

B.

Rs (optional) must be < 1kΩ in most applications. Selections of Rs depends on specific applications; see the Section 7.3.5

C.

CDIFF (optional) must be < 1000pF in most applications. Selection of CDIFF depends on specific application; see the Section 7.3.5 and

Figure 6-8.

TMP9R01-SEP, TMP9R01-SP

SNIS238A – JULY 2025 – REVISED JULY 2026

www.ti.com

14

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