S-5851AAA-I6T1U Datasheet, PDF (19/29 Pages) Seiko Instruments Inc – 2-WIRE DIGITAL TEMPERATURE SENSOR

Rev. 2.1_00
2-WIRE DIGITAL TEMPERATURE SENSOR
S-5851A Series
„ Operation during the Low Power Supply Voltage
The S-5851A Series has a low power supply voltage detection circuit, stops the interface circuit when the power supply
voltage drops to the level of the detection voltage or less. The detection voltage is 1.9 V typ., the release voltage is 2.0 V
typ.
Power supply voltage
Detection voltage
1.9 V typ.
Release voltage
2.0 V typ.
Reset internal circuit
Interface circuit stops
Figure 23 Operation during the Low Power Supply Voltage
„ How to Reset S-5851A Series
Which status the S-5851A Series is in, users can reset the S-5851A Series externally by following two ways.
• Set the power supply voltage at 0 V once in order to get it back to the range of operating voltage again. Have a period at
least 10 ms or more to set the power supply voltage at 0 V.
• Release the bus, after that, do the reset instruction for general call.
First, input a start condition and send the 9 clocks (dummy clock) to the SCL line. During this, set the master device to
input “H” to the SDA line. By this operation the S-5851A Series stops outputting an acknowledgment signal or outputting
data, then input a start condition and a stop condition.
After that, send a general call (0000000) and send 0 as the 8th bit. And send 00000110 as the second byte.
Consequently, the S-5851A Series resets its inside status.
Start condition
Dummy clock
Start
condition
Stop
condition
1
2
8
9
SCL
SDA
Output from
master device
Figure 24 How to Release Bus
Seiko Instruments Inc.
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