2-WIRE DIGITAL TEMPERATURE SENSOR
1. AD0, AD1 pins (Address input)
To set the slave address, connect the AD0 and AD1 pins to VSS / VDD or set them open. When connecting them to VSS
/ VDD, set the value for a resistor at 500 Ω or less. When setting them open, avoid to apply noise. The value for
capacitor is 100 pF or less for the AD0 and AD1 pins.
Users are able to set 8 types of slave address by using the combination of the AD0 and AD1 pins.
The S-5851A Series verifies if the slave address set by user matches with the slave address transmitted from the
master device or not, so that one S-5851A Series is selected from the devices connected onto the bus.
2. SDA pin (I/O for serial data)
The SDA pin transmits serial data bi-directionally, is comprised of a signal input pin and a pin with Nch open drain
output. In use, generally, connect the SDA line to any other device which has the open-drain or open-collector output
with Wired-OR connection by pulling up to VDD by a resistor. Figure 4 shows the relation with an output load.
Value of load capacity (pF)
Figure 4 Output Load
3. SCL pin (Input for serial clock)
The SCL pin is an input pin for serial clock, processes a signal at a rising / falling edge of SCL clock. Pay attention fully
to the rising / falling time and comply with specifications.
Seiko Instruments Inc.