TMP139AIYAHT datasheet(10/58 Pages) TI

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7 Detailed Description

7.1 Overview

The TMP139 is a high-accuracy temperature sensor that supports a power-up sequence, power-down and

device reset, parity and packet error check functions, In Band Interrupts (IBI), and common command codes

(CCC).

7.2 Functional Block Diagram

SDA

SCL

VDDIO

VDDSPD

VSS

I3C Serial Interface

Control Logic

Temperature

Sensor

ADC

VDDIO = 1.0V

VDDSPD = 1.8V

Temperature

Sensor Registers

Figure 7-1. TMP139 Functional Block Diagram

7.3 Feature Description

7.3.1 Power-Up Sequence

The TMP139 has two supply pins: VDDSPD which is the core supply, and VDDIO which is the IO supply. To ensure

that the device starts up correctly, the application must power up VDDSPD first followed by VDDIO. Additionally, the

power-on reset (POR) circuit is implemented to prevent improper operation in case of an incorrect power-up

sequence.

As shown in Figure 7-2, the VDDSPD supply is applied first and must rise monotonically between VPON(min) and

VDDSPD(min) without ring back. The VDDIO supply must ramp up next and must reach the correct level before any

operation can be performed.

VDDSPD

VDDIO

VPON(min)

VDDSPD(min)

VDDIO(min)

tSENSE_SA

tINIT

Ready to accept I

co mmand

Figure 7-2. Power-Up Sequence

When the VDDSPD and VDDIO supply have ramped up above the minimum threshold values, the TMP139

performs the following steps:

1. Within the time tSENSE_SA, the device samples the SA pin to configure the LID code which forms part of the

device address.

TMP139

SNIS217 – DECEMBER 2020

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