Datasheet
Table Of Contents
- Content Guide
- 1 General Description
- 2 Ordering Information
- 3 Pin Assignment
- 4 Absolute Maximum Ratings
- 5 Operating Conditions
- 6 Register Description
- 6.1 Register Overview
- 6.2 Detailed Register Description
- 6.3 Serial Interface
- 6.3.1 Bus Description
- 6.3.2 Data Interface
- 6.3.3 Bus Address
- 6.3.4 Read/Write Operation
- 6.3.5 Slave Operation
- 6.3.6 Slave Receiver Mode
- 6.3.7 Slave Transmitter
- 6.3.8 Alert Function
- 6.3.9 High Speed Mode
- 6.3.10 General Call
- 6.3.11 Start Byte
- 6.3.12 Timeout Function
- 6.3.13 Bus Conditions
- 6.3.14 Timing Characteristics
- 6.3.15 Timing Diagrams
- 7 Application Information
- 8 Package Drawings & Markings
- 9 Revision Information
- 10 Legal Information
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AS621x
Register Description
Datasheet • PUBLIC
DS000677 • v2-00 • 2020-Feb-24
36 │ 17
6.2.7 Consecutive Faults
A fault condition persists if the measured temperature either exceeds the configured value in register
THIGH or falls below the defined value in register TLOW. As a result, the ALERT pin indicates the
fault condition if a defined number of consecutive temperature readings meets this fault condition. The
number of consecutive faults are defined with two bits (12 and 11) and prevent a false alert if
environmental temperature noise is present. The register configuration is shown in the following table.
Figure 21:
Consecutive Faults Bit Settings
Consecutive Fault Bits
Consecutive Faults (N)
Bit 13
Bit 12
0
0
1
0
1
2
1
0
3
1
1
4
6.2.8 Single Shot Conversion
The device features a single shot measurement mode if the device is in sleep mode (SM=1). By
setting the “Single Shot-bit” to 1, a single temperature conversion is started and the SS-bit can be read
as 1 during the active conversion operation. Once the conversion is completed, the device enters the
sleep mode again and the SS-bit is set to 0. The single shot conversion allows very low power
consumption since a temperature conversion is executed on demand only. This allows a user defined
timing of the temperature conversions to be executed and is used if the consecutive operation mode is
not required.
The first conversion triggered in this mode has a longer conversion time. In the section 6.2.4 Sleep
Mode it is detailed together with the recommendation to trigger the first conversion simultaneously with
entering the sleep mode.
As the device exhibits a very short conversion time, the effective conversion rate can be increased by
setting the single shot bit repetitively after a conversion has finished. However, it has to be ensured
that the additional power is limited, otherwise self-heating effects have to be considered.
Figure 22:
Single Shot Conversion Bit Settings
Single Shot Bit
Conversion
0
No conversion ongoing/ conversion finished
1
Start single shot conversion / conversion ongoing