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PDF S-5851A Data sheet ( Hoja de datos )
| Número de pieza | S-5851A | |
| Descripción | 2-WIRE DIGITAL TEMPERATURE SENSOR | |
| Fabricantes | Seiko Instruments | |
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S-5851A Series
www.sii-ic.com
© Seiko Instruments Inc., 2009-2010
2-WIRE DIGITAL TEMPERATURE SENSOR
Rev.2.1_00
S-5851A Series is a 2-wire serial I/O digital temperature sensor. This IC measures temperature with resolution of 0.0625°C
without external parts. This IC is ideal for wide-ranging temperature measurement for various applications.
A temperature sensor, a reference voltage generation circuit, a ΔΣ type A/D converter and interface bus are integrated in a
chip, and packages SNT-6A and SOT-23-6 available for this IC.
Features
• Low voltage operation
• Low current consumption
• High accuracy
• Temperature resolution
• Digital output
• Maximum operating frequency
• Low power supply voltage detection circuit
• Lead-free, Sn 100%, halogen-free*1
: VDD (min.) = 2.7 V
: 45 μA typ. (+25°C)
1 μA typ. (+25°C at shutdown)
: ±2.0°C (max.) −25°C to +85°C
±3.0°C (max.) −40°C to +125°C
: 0.0625°C
: 2-wire serial interface
: 400 kHz
*1. Refer to “ Product Name Structure” for details.
Applications
• Temperature monitor for power supply
• Temperature monitor for battery
• Air conditioning system
• Various electronics devices
Packages
• SNT-6A
• SOT-23-6
Seiko Instruments Inc.
1
1 page  
Rev. 2.1_00
Pin Functions
2-WIRE DIGITAL TEMPERATURE SENSOR
S-5851A Series
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.
20
18
16
14
12
10
8
6
4
2
0
10
fSCL=400 kHz
Value of load capacity (pF)
100
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.
5
5 Page 
Rev. 2.1_00
2-WIRE DIGITAL TEMPERATURE SENSOR
S-5851A Series
Registers
1. Configuration of register
The S-5851A Series has a temperature register for reading temperature data, a configuration register to set operations
of the S-5851A Series and a pointer register that sets which register will operate Read/Write.
Pointer register
SDA
SCL
Interface circuit
Temperature register
Configuration register
Figure 11 Configuration of Register
2. Pointer register
The pointer register is an 8-bit register that sets which register will operate Read/Write. Write 00h in the pointer register
enables to Read the temperature register. Write 01h enables to Read/Write the configuration register. The value is 00h
after power-up/reset of the pointer register.
Users are not able to read the point register directly. When you are uncertain of the value in the pointer register,
designate the pointer register again.
0000000
MSB
Figure 12 Configuration of Pointer Register
P0
LSB
Seiko Instruments Inc.
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