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TMP1827 Datasheet(PDF) 24 Page - Texas Instruments

Part # TMP1827
Description  TMP1827 1-Wire®, ±0.2°C Accurate Temperature Sensor With SHA-256-HMAC Authentication Engine, 2Kb EEPROM
PDF  65 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TMP1827 Datasheet(HTML) 24 Page - Texas Instruments

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and then goes back to low power shutdown mode (see Figure 9-12). If the device is in continuous conversion
mode, then the one-shot conversion mode request is ignored.
Reset
Answer to
Reset
SKIPADDR
(CCh)
CONVERT
TEMP (44h)
Start of Conversion
Ac ve conversion me (tACT)
Shutdown
Shutdown
Temperature
Conversion
Bus
Communica on
Command startup delay (tDELAY)
8 Samples
Averaging Enabled
Figure 9-12. One-Shot Conversion Mode
As shown in Figure 9-13, 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 activated before tDELAY. 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
(CCh)
CONVERT TEMP
(44h)
Start of Conversion
Ac ve conversion me (tACT)
Shutdown
Shutdown
Temperature
Conversion Sequence
Bus Communica on
TMP18xx
Device 0
TMP18xx
Device 1
TMP18xx
Device 2
Figure 9-13. Multiple Device One-Shot Conversion Mode
9.4.1.2 Auto Conversion Mode
The auto conversion mode is a programmable feature in bus powered mode that can be enabled by setting the
CONV_MODE_SEL as '10b' in the device configuration-1 register. As shown in Figure 9-14, the host can skip
the issue of the temperature conversion request and directly read the temperature data from the device when
the auto conversion mode is enabled. This enables the application to speed up the temperature conversion
TMP1827
SBOSA15A – SEPTEMBER 2022 – REVISED MAY 2023
www.ti.com
24
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Product Folder Links: TMP1827



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