TMP1827 datasheet(24/68 Pages) TI

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8.4 Device Functional Modes

The TMP1827 device features flexible temperature conversion modes along with robust user EEPROM

architecture, which is described in the sections below.

8.4.1 Conversion Modes

The TMP1827 supports both one-shot and continuous conversion modes. There are different methods for

one-shot conversion modes, that may be used based on single device or multiple device bus network. The

continuous conversion mode is only supported in VDD powered mode. Each of the conversion modes are with

single temperature sample, but the host can enable 8 samples averages in the device for improved accuracy.

8.4.1.1 Basic One-Shot Conversion Mode

The basic one-shot conversion mode is the default conversion mode. The device goes through a bus reset,

address and function phase to initiate the temperature conversion. During the communication, the device is in

shutdown mode. When the conversion request is registered by the device, the device starts active conversion

and then goes back to low power shutdown mode as shown in Figure 8-12. If the device is in continuous

conversion mode, then the one-shot conversion mode request is ignored.

Reset

Answer to

Reset

SKIPADDR

CONVERT

TEMP

Start of Conversion

Ac ve conversion me (tACT)

Shutdown

Temperature

Conversion

Bus

Communica on

Command startup delay (tDELAY)

Averaging

Enabled

Figure 8-12. One-Shot Conversion Mode

As shown in Figure 8-13, there is no change in how one-shot conversion is performed when there are multiple

devices on the bus. However, as there are multiple devices, the combined current drain in bus powered mode

of operation may cause the bus voltage to drop. In such use cases, it is required that the host implement a

low impedance current path using a FET/transistor switch. This path is switched on so as to meet the current

requirement of the bus during an active conversion and after the active conversion duration is complete, it is

switched off for bus communication.

Command startup delay (tDELAY)

Reset

Answer to

Reset

SKIPADDR

CONVERT

TEMP

Start of Conversion

Ac ve conversion me (tACT)

Shutdown

Temperature

Conversion Sequence

Bus Communica on

TMP18xx

Device 0

TMP18xx

Device 1

TMP18xx

Device 2

Figure 8-13. Multiple Device One-Shot Conversion Mode

TMP1827

SBOSA15 – SEPTEMBER 2022

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