S-5851A Series
www.sii-ic.com 2-WIRE DIGITAL TEMPERATURE SENSOR
© Seiko Instruments Inc., 2009-2010 Rev.2.1_00
Seiko Instruments Inc. 1
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 g eneration 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 : VDD (min.) = 2.7 V
• Low current consumption : 45 μA typ. (+25°C)
1 μA typ. (+25°C at shutdown)
• High accuracy : ±2.0°C (max.) −25°C to +85°C
±3.0°C (max.) −40°C to +125°C
• Temperature resolution : 0.0625°C
• Digital output : 2-wire serial interface
• Maximum operating frequency : 400 kHz
• Low power supply voltage detection circuit
• Lead-free, Sn 100%, halogen-free*1
*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
2-WIRE DIGITAL TEMPERATURE SENSOR
S-5851A Series Rev. 2.1_00
Seiko Instruments Inc.
2
Block Diagram
VSS
AD1
SCL
AD0
VDD
SDA
Control
Logic
ΔΣA/D
Converter
Oscillator
Temp
Sensor
Serial
Interface
Register
Figure 1
2-WIRE DIGITAL TEMPERATURE SENSOR
Rev. 2.1_00 S-5851A Series
Seiko Instruments Inc. 3
Product Name Structure
1. Product name
(1) SNT-6A
S-5851AAA - I6T1 x
Package name (abbreviate d) and IC packing specification
*1
I6T1 : SNT-6A, Tape
Product name
Environmental code
U : Lead-free (Sn 100%), halogen-free
G : Lead-free (for details, please contact our sales office)
*1. Refer to the ta pe spe cif icati on .
(2) SOT-23-6
S-5851AAA - M6T1 x
Package name (abbrev iate d) and IC packing specificat ion*1
M6T1 : SOT-23-6, Tape
Product name
Environmental code
U : Lead-free (Sn 100%), halogen-free
S : Lead-free, halogen-free
*1. Refer to the ta pe spe cif icati on .
2. Package
Drawing Code
Package Name Package Tape Reel Land
SNT-6A PG006-A-P-SD PG006-A-C-SD PG006-A-R-SD PG006-A-L-SD
SOT-23-6 MP006-A-P-SD MP006-A-C-SD MP006-A-R-SD ⎯
3. Product name list
Table 1
Product name Package
S-5851AAA-I6T1x SNT-6A
S-5851AAA-M6T1y SOT-23-6
Remark 1. x: G or U
y: S or U
2. Please select products of environmental code = U for Sn 100%, halogen-free products.
2-WIRE DIGITAL TEMPERATURE SENSOR
S-5851A Series Rev. 2.1_00
Seiko Instruments Inc.
4
Pin Configuration
Table 2
Pin No. Symbol Description
1 AD1 Address input
2 VSS GND
3 SCL Input for serial clock
4 SDA I/O for serial data
5 AD0 Address input
6 VDD Power supply
SNT-6A
Top view
1
2
3 4
6
5
Figure 2 Remark See Dimensions for details of the package drawings.
Table 3
Pin No. Symbol Description
1 SCL Input for serial clock
2 VSS GND
3 AD1 Address input
4 VDD Power supply
5 AD0 Address input
6 SDA I/O for serial data
SOT-23-6
Top view
6 4
3
2 1
5
Figure 3
Remark See Dimens ions for details of the package drawings.
2-WIRE DIGITAL TEMPERATURE SENSOR
Rev. 2.1_00 S-5851A Series
Seiko Instruments Inc. 5
Pin Functions
1. AD0, AD1 pins (Address input)
To set the slave address, con nect the AD0 and AD 1 pins to VSS / VDD or s et them open. When connecti ng 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 pull ing up to VDD by a resistor. Figure 4 shows the relation with an output load.
0
2
4
6
8
12
14
16
20
10
100
Value of load capacity (pF)
Maximum value of pull-up resistor (k
Ω
)
18
10
f
SCL
=400 kHz
Figure 4 Output Load
3. SCL pin (Input for serial clock)
The SCL pin is an input pin fo r serial clock, processes a si g nal at a rising / fallin g edge of SCL clock. Pa y attention fully
to the rising / falling time and comply with specifications.
2-WIRE DIGITAL TEMPERATURE SENSOR
S-5851A Series Rev. 2.1_00
Seiko Instruments Inc.
6
Equivalent Circuits of Input, I/O pins
The SCL, AD0 and AD1 pins are CMOS input pins. The SDA pin works as both Nch open drain output pin and CMOS
input pin. The equivalent circuits are follows.
AD0, AD1
Figure 5 AD0, AD1 Pins
SDA
Figure 6 SDA Pin
SCL
Figure 7 SCL Pin
2-WIRE DIGITAL TEMPERATURE SENSOR
Rev. 2.1_00 S-5851A Series
Seiko Instruments Inc. 7
Absolute Maximum Ratings
Table 4 (Ta = +25°C unless otherwise specified)
Item Symbol Ratings Unit
Power supply voltage (VSS = 0 V) VDD V
SS−0.3 to VSS+6.0 V
SCL, SDA pin voltage VSCL, VSDA V
SS−0.3 to VSS+6.0 V
AD0, AD1 pin voltage VAD0, VAD1 V
SS−0.3 to VDD+0.3 V
SNT-6A 400*1 mW
Power dissipation SOT-23-6 PD 650*1 mW
Operation ambient temperature Topr −40 to +125 °C
Storage temperature Tstg −55 to +150 °C
*1. When mounted on board
[Mounted board]
(1) Board size : 114.3 mm × 76.2 mm × t1.6 mm
(2) Board name : JEDEC STANDARD51-7
Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical
damage. These values must therefore not be exceeded under any conditions.
2-WIRE DIGITAL TEMPERATURE SENSOR
S-5851A Series Rev. 2.1_00
Seiko Instruments Inc.
8
Pin Capacitance
Table 5 (Ta = 25°C, f = 1.0 MHz, VDD = 5.0 V)
Item Symbol Condition Min. Max. Unit
Input capacitance CIN V
IN = 0 V (SCL, AD0, AD1) ⎯ 10 pF
I/O capacitance CI/O V
IN = 0 V (SDA) ⎯ 10 pF
Temperature Characteristics Table 6
(Ta = 25°C, VSS = 0 V unless otherwise specified)
Item Symbol Condition Min. Typ. Max. Unit
Operation ambient temperature Topr ⎯ −40 ⎯ +125 °C
TACC1 −25°C to +85°C ⎯ ±0.5 ±2.0 °C
Temperature accuracy TACC2 −40°C to +125°C ⎯ ±1.0 ±3.0 °C
Temperature resolution TRES ⎯ ⎯ 0.0625 ⎯ °C
A/D resolution RESO ⎯ ⎯ 12 ⎯ bits
Temperature update time*1 tCNV ⎯ ⎯ 320 500 ms
*1. Although within this temperature update time, reading data is possible as many times as needed.
DC Electrical Characteristics
Table 7 (Ta = 25°C, VSS = 0 V unless other wise specified)
Item Symbol Condition Min. Typ. Max. Unit
Power supply voltage VDD ⎯ 2.7 ⎯ 5.5 V
IDD1 Serial bus in non-active ⎯ 45 60 μA
Current consumption
at operation IDD2 Serial bus in active
SCL clock frequency = 400 k Hz
VDD = 3.3 V
⎯ 80 ⎯ μA
IDD3 Serial bus in non-active
Connect SCL, SDA to VSS or
VDD
⎯ 1.0 5.0 μA
Current consumption
at shutdown IDD4 Serial bus in active
SCL clock frequency = 400 k Hz
VDD = 3.3 V
⎯ 30 ⎯ μA
High level input voltage 1 VIH1 SCL, SDA 0.7×VDD ⎯ V
SS+6.0 V
High level input voltage 2 VIH2 AD0, AD1 0.9×VDD ⎯ V
DD V
Low level input voltage 1 VIL1 SCL, SDA VSS ⎯ 0.3×VDD V
Low level input voltage 2 VIL2 AD0, AD1 VSS ⎯ 0.1×VDD V
Input leakage current ILI VIN = 0 V to 5.5 V
(SCL, AD0, AD1) ⎯ 0.1 1.0 μA
I/O leakage current ILO V
IN = 0 V to 5.5 V (SDA) ⎯ 0.1 1.0 μA
Low level output voltage VOL I
OL = 3 mA VSS ⎯ 0.4 V
2-WIRE DIGITAL TEMPERATURE SENSOR
Rev. 2.1_00 S-5851A Series
Seiko Instruments Inc. 9
AC Electrical Characteristics
Table 8 Measurement Conditions
Input pulse voltage VIH = 0.8×VDD, VIL = 0.2×VDD
Input pulse rise/fall time 20 ns or less
Output reference voltage VOH = 0.7×VDD, VOL = 0.3×VDD
Output load 100 pF
0.7×VDD
0.3×VDD
0.8×VDD
0.2×VDD
I/O reference voltage
Input voltage
Figure 8 AC Measurement I/O Waveform
Table 9 (Ta = 25°C, VSS = 0 V unless otherwise specified)
Item Symbol Min. Typ. Max. Unit
Clock frequency fSCL ⎯ ⎯ 400 kHz
Bus release time tBUF 600 ⎯ ⎯ ns
Start condition hold time tHD.STA 600 ⎯ ⎯ ns
Start condition setup time tSU.STA 600 ⎯ ⎯ ns
Stop condition setup time tSU.STO 600 ⎯ ⎯ ns
Data input hold time tHD.DAT 0 ⎯ ⎯ ns
Data input setup time tSU.DAT 100 ⎯ ⎯ ns
SCL clock time “L” tLOW 1300 ⎯ ⎯ ns
SCL clock time “H” tHIGH 600 ⎯ ⎯ ns
SCL, SDA falling time tF ⎯ ⎯ 300 ns
⎯ ⎯ 300*1 ns
SCL, SDA rising time tR ⎯ ⎯ 1000*2 ns
SDA output delay time tAA 100 ⎯ 900 ns
SDA output hold time tDH 50 ⎯ ⎯ ns
Address input hold time tHDAD 0 ⎯ ⎯ ns
Address input setup time tSUAD 0 ⎯ ⎯ ns
Noise suppression time tI ⎯ ⎯ 50 ns
*1. f
SCL > 100 kHz
*2. f
SCL ≤ 100 kHz
2-WIRE DIGITAL TEMPERATURE SENSOR
S-5851A Series Rev. 2.1_00
Seiko Instruments Inc.
10
SCL
SDA IN
SDA OUT
tBUF
tR
tSU.STO
tSU.DAT
tHD.DAT
tDH
tAA
tHIGH tLOW
tHD.STA
tSU.STA
tF
Figure 9
SCL
SDA X X
X
Start
condition
Stop
condition
AD0, AD1
(0,1 input)
tSUAD tHDAD
AD0, AD1
(open)
Figure 10
2-WIRE DIGITAL TEMPERATURE SENSOR
Rev. 2.1_00 S-5851A Series
Seiko Instruments Inc. 11
Registers
1. Configuration of register
The S-5851A Series has a temperature register for readin g temperature d ata, a configuration register to set operation s
of the S-5851A Series and a pointer register that sets which register will operate Read/W r ite.
SDA
SCL
Interface circuit
Pointer register
Temperature register
Configuration register
Figure 11 Configuration of Register
2. Pointer register
The pointer reg ister is an 8-bit register that sets which register will operate Read/Write. Write 00h in the pointer register
enables to Rea d the tem perature register. Write 01 h enab le s to Rea d/W rite t he c onfig ura tion re gister. The va lue is 0 0h
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.
0 0 0 0 0 0 0 P0
MSB LSB
Figure 12 Configuration of Pointer Register
2-WIRE DIGITAL TEMPERATURE SENSOR
S-5851A Series Rev. 2.1_00
Seiko Instruments Inc.
12
3. Temperature register
The temperature regist er is a 12-bit R ead-on ly register and st ores t he lat es t t emperat ure d at a. T o gain al l dat a, Re ad 2
bytes. Its first 12 bits are t emperature data and 0 is output in other bit s. The temperature register outputs 0°C unt il the
first conversion has finished after power-up or reset.
T11 T10 T9 T8 T7 T6 T5 T4
First byte
T3 T2 T1 T0 0 0 0 0
MSB LSB
Second byte
Figure 13 Configuration of Temperature Register
The 12 bits T11 to T0 show temperature. The highest bit of temperature data (T11) shows positive/negative in
temperature. I ts resolution is 0.0625°C. Table 10 shows the typical temperature and t emperature data.
It is unnecessary to receive all data in the temperature register. Users are able to finish transmission by inputting a
stop condition without sending an ackno wledgment signal back from the master devic e, after Read the first byte in t he
temperature register.
Table 10 Temperature Data
Temperature data
Temperature
(°C) Binary system
(T11 − T0) Hexadecimal
125 0111 1101 000 0 7D0
100 0110 0100 000 0 640
80 0101 0000 000 0 500
75 0100 1011 000 0 4B0
50 0011 0010 000 0 320
25 0001 1001 000 0 190
0.25 0000 0000 0100 004
0 0000 0000 000 0 000
−0.25 1111 1111 1100 FFC
−25 1110 0111 0000 E70
−40 1101 1000 0000 D80
2-WIRE DIGITAL TEMPERATURE SENSOR
Rev. 2.1_00 S-5851A Series
Seiko Instruments Inc. 13
4. Configuration register
The configuration register is an 8-bit Read/Write register, and stores bit which controls operations of the S-5851A
Series. The Read/Write opera tion can be performed from MSB. A ll bits are 0 after power-up/reset of this configuration
register. In case of rewriting bit data except SD, OS bit s , the bit data will be omitted.
OS 0 0 0 0 0 0 SD
MSB LSB
Figure 14 Configuration Register
4. 1 Shutdown mode (SD)
Write 1 in the shutdo wn mode bit (SD) in t he configuration r egister stops the circu its except the ser ial interface, thus
enables to reduce p ower consumption. By this mode, current comsumption will decrease to 1 μA (typ.) or less. This
mode is valid after the current conversion.
By Write 0 in the shutdown mode bit (SD), the S-5851A Series returns to the normal status in which the S-5851A
Series continues updating t emperature data. Users can always read t he latest temperature data.
4. 2 One-shot mode (OS)
The S-5851A Series features the one-shot temperature measure mode. In the shutdown mode, By Write 1 in the
one-shot mode bit (OS) in the configuration register, the S-5851A Series starts converting temperature that is done
only once. The S-5851A Series finishes updating data in the temperature register after this single temperature
conversion, the S-5851A Series returns to the shutdown mode again. When continuous temperature monitoring is
unnecessary, this mode redu ces consumption power.
Write 1 in the one-shot mode bit (OS) in the normal status, the one-shot mode bit (OS) keeps 1 until the current
temperature data has finished updating. After this updating, the one-shot mode bit (OS) is set to 0 to indicate the
upload completi on.
2-WIRE DIGITAL TEMPERATURE SENSOR
S-5851A Series Rev. 2.1_00
Seiko Instruments Inc.
14
Operation
The S-5851A Series is a digital temperat ure sensor with 2-wire serial inter face. By transmission using the SCL and SDA
pins, users are able to Read temperature data and set the various modes for the S-5851A Series. Connect a bypass
capacitor of 0.1 μF between the VDD and VSS pins for proper temperature dat a.
1. Start condition
A start condition starts b y changing the SDA line from “H” to “L” while the SCL line is “H”.
All operations start with a start condition.
2. Stop condition
A stop condition starts by changing the SDA line from “L” to “H” while the SCL line is “H”.
During Read sequence if the S-5851A Series receives a stop condition, its Read operation is interrupt ed.
During Write sequence if the S-5851A Series receives a stop condition, the S-5851A Series finishes installing Write
data.
Start condition Stop condition
SCL
SDA
“H” “H”
Figure 15 Start/Stop Conditions
2-WIRE DIGITAL TEMPERATURE SENSOR
Rev. 2.1_00 S-5851A Series
Seiko Instruments Inc. 15
3. Data transmission
Data is transmitted by changing the SDA line while the SCL line is “L”.
If the SDA line changes while the SCL line is “H”, the S-5851A Series goes in the start or stop condition status.
SCL
SDA
“L” “L” “L”
Figure 16 Data Transmission Timing
4. Acknowledgment
Data is transmitted sequentially in 8-bit. Changing the SDA line to “L” indicates that the devices on the system bus
have received data, t hus the devices send an acknowledgment signal back during the 9th clock of cycle.
1 8 9
Acknowledgment
output
Start condition
SCL
(Input to S-5851A Series)
SDA
(Output from master device)
SDA
(Outpu t from S-5851A Se rie s)
Figure 17 Acknowledgment Output Timing
2-WIRE DIGITAL TEMPERATURE SENSOR
S-5851A Series Rev. 2.1_00
Seiko Instruments Inc.
16
5. Device addressing
To start the transmission, the mast er devic e on t he s ystem gen erates a start condition fo r the slave ad d ress. Af ter t hat,
the master device transmits the 7-bit slave address and the 1-bit Read/Write instruct ion code to the SDA bus.
The higher 4 bits of the slave address are device code, and are fixed to “1001”.
The next 3 bits (A2, A1, A0) are used to select the devices on the s ystem bus, and they are compar ed with the slave
address which is set beforeha nd by the address input pins (AD1, AD0). If the comparison result matches, the S-5851 A
Series sends an acknowledgment signal back at the 9th clock of cycle. Table 11 shows the settings for the address
input pins (AD1, AD0) and th e slave address.
The the S-5851A Series does not send an acknowledgment signal back unless the slave address matches.
Table 11 Settings for Address Input Pin and Slave Address
Settings for address input
pin Slave address
AD1 pin AD0 pin Device
code A2 A1 A0
0 0 0 0 0
0 Open 0 0 1
0 1 0 1 0
1 0 1 0 0
1 Open 1 0 1
1 1 1 1 0
Open 0 0 1 1
Open 1
1001
1 1 1
1 0 0 1 A2 A1 A0 R / W
MSB LSB
S-5851A
Series
Slave address
Device code
Figure 18 Slave Address
2-WIRE DIGITAL TEMPERATURE SENSOR
Rev. 2.1_00 S-5851A Series
Seiko Instruments Inc. 17
6. Configuration register’s Write operation
When the S-5851A Series receives the 7-bit slave address and the Read/Write instruction code “0” after receiving a
start condition, it generates an acknowledgment signal.
Next, it receives the 8-bit pointer register’s dat a, and generates an acknowledgment signal. After receiving 8-bit Write
data, it rewrites data in the configuration register designated by user, and generates an acknowledgment signal. It
receives a stop conditi on so that the Write operatio n is finished.
A2 A1
A0
S
T
A
R
T
1 0 0 1
W
R
I
T
E
DEVICE
ADDRESS
R
/
W
M
S
B
SDA LINE
A
C
K
L
S
B
POINTER REGISTER
A
C
K
0
S
T
O
P
DATA
0 0 0 0 0 0 0 1 D7 D6 D5
D4
D3
D2
D1
D0
A
C
K
A
C
K
Figure 19 Write Operation
7. Read operation
7. 1 Read by register-desi g nation
To read data in the register set by user arbitrarily, use this function Read by register designation.
Beforehand, do dummy write as follows to set the pointer register.
When the S-5851A Series receives 7-b it slav e addr ess and the Rea d/W rite inst ruction co de “0” af ter recei ving a st art
condition, it ge nerates an acknowledgment signal.
Next, the S-5851A Series receives 8-bit pointer register’s data and generates an acknowledgment signal. By these
operations, users can set the pointer register .
And the S-5851A Series rece ives 7-bit slave address and the Read/Write inst ruction code “1” after receiving a star t
condition, it ge nerates an acknowledgment signal.
8-bit data in the register designated by user will be output synchronizing with the SCL clock from the S-5851A
Series.
After these operations, the master device sends a stop condition not outputting an acknowledgment signal so that
the Read operation is finished.
SDA
LINE
S
T
A
R
T
1 0 0 1
W
R
I
T
E
R
/
W
M
S
B
A2 A1 A0
A
C
K
L
S
B
0 0
0
0
0
0
0
0
A
C
K
0
DUMMY W RITE
S
T
O
P
S
T
A
R
T
1 0 0 1
R
E
A
D
R
/
W
M
S
B
A2 A1 A0
A
C
K
L
S
B
1
DATA
T3 T2
T1
T0
A
C
K
DATA
T11 T10
T9 T8 T7 T6 T5
T4
0 0 0 0
DEVICE
ADDRESS DEVICE
ADDRESS
POINTER REGISTER
ACK from
M aster Device NO ACK from
M aster Device
Figure 20 When Reading Temperature Register
2-WIRE DIGITAL TEMPERATURE SENSOR
S-5851A Series Rev. 2.1_00
Seiko Instruments Inc.
18
SDA
LINE
S
T
A
R
T
1 0 0 1
W
R
I
T
E
R
/
W
M
S
B
A2 A1 A0
A
C
K
L
S
B
0
0
0
0 0 0 0
1
A
C
K
0
DUMMY WRITE
S
T
O
P
S
T
A
R
T
1 0 0 1
R
E
A
D
R
/
W
M
S
B
A2 A1 A0
L
S
B
1
A
C
K
DATA
SDOS
0
0
0
0
0
0
DEVICE
ADDRESS POINTER REGISTER DEVICE
ADDRESS
NO ACK from
Master Device
Figure 21 When Reading Configuration Register
7. 2 Current Register Read
The S-5851A Series maintains values of the pointer register’s data that is accessed by the S-5851A Series most
recently in both Read and Write. As long as the master device recognizes values of the pointer’s data, users can
read current data in the pointer register without designation. This is current register rea d.
In case that the S-5851A Series’s pointer register is indicat ing the temper ature regist er, the S-5851A Series receives
7-bit slave address and the Read/Write instruction code “1” after receiving a start condition, it generates an
acknowledgment signal.
Next, the first byte data in the temperature register will be output from the S-5851A Series synchronizing with the
SCL clock. After that, the master device outputs an ackno wledgment signal, the S-5851A Seri es outputs 4 bits from
MSB of the second byte in the temperature register, and 4 bit s from LSB are zero.
After these operations, the master device sends a stop condition so that the Read operation is finished.
SDA
LINE
S
T
O
P
S
T
A
R
T
1
0
0
1
R
E
A
D
R
/
W
M
S
B
A2
A1
A0
A
C
K
L
S
B
1T3 T2 T1 T0
A
C
K
DATA
T11 T10
T9 T8 T7 T6 T5 T4
0 0 0
0
DEVICE
ADDRESS
ACK from
M aster Device
DATA
Figure 22 Current Register Read
8. General call
After 2-wire interface general call (0000000), the S-5851A Series sends back an ackno wledgment signal when the 8th
bit is set to 0. And when the second byte is 00000100, the S-5851A Series reinstalls the status of the AD0 and AD1
pins and sends back an acknowledgment signal without resetting the inside status. But when the second byte is
00000110, the S-5851A Series resets its inside all, a nd goes back itself to the status immediately after power-up.
2-WIRE DIGITAL TEMPERATURE SENSOR
Rev. 2.1_00 S-5851A Series
Seiko Instruments Inc. 19
Operation during the Low Pow er Supply Voltage
The S-5851A Series has a low po wer supply voltage detection circuit, stops the interface circuit when the power supply
voltage drops to the leve l of the detection voltage or less. The detection voltage is 1.9 V typ., the release voltage is 2.0 V
typ.
Release voltage
2.0 V typ.
Power supply voltage
Reset internal circuit
Interface circuit stops
Detection voltage
1.9 V typ.
Figure 23 Operation during the Low Power Supply Voltage
How to Reset S-5851A Series
Which status the S-5851A Series i s in, users can rese t 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.
1 2 8 9
SCL
SDA
Output from
master device
Start conditi on
Stop
condition
Start
condition
Dummy clock
Figure 24 How to Release Bus
2-WIRE DIGITAL TEMPERATURE SENSOR
S-5851A Series Rev. 2.1_00
Seiko Instruments Inc.
20
Precaution
• Set a bypass capacitor of approx. 0.1 μF between VDD and VSS pins, nearest to the IC for stabilization.
• The applicatio n cond itions for the input v olt age, outp ut volta ge, an d l oad c urrent sh oul d n ot e xceed the package power
dissipation.
• Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic
protection circuit.
• SII claims no r esponsibilit y for any disputes arising out of or in connection with any infringement b y products, including
this IC, of patents owned by a third party.
2-WIRE DIGITAL TEMPERATURE SENSOR
Rev. 2.1_00 S-5851A Series
Seiko Instruments Inc. 21
Characteristics (Typical Data)
1. Current consumption at operation (IDD1) ⎯
Temperature 2. Current consumption at shutdown (IDD3) ⎯
Temperature
−
25 0 100
55
50
45
40
35
30
25
Ta [°C]
5025 75 125
−
40
IDD1 [μA]
V
DD
= 5 V
V
DD
= 2.7 V
−40−25 0 25 50 75 100
5.0
4.5
4.0
3.0
2.5
2.0
1.5
1.0
0.5
0125
I
DD3
[μA]
Ta [°C]
V
DD
= 5 V
V
DD
= 2.7 V
3. Temperature accuracy (TAAC) ⎯
Temperature 4. Temperature update time (tCNV) ⎯
Temperature
TACC [°C]
−
25 0 100
2.0
1.0
0.0
−
1.0
−
2.0
Ta [°C] 7525 50 125
−
40
3 typical units
t
CNV
[ms]
−
25
−
40 25
0 100
500
450
400
350
300
250
200
Ta [°C]
50 75 125
V
DD
= 2.7 V
V
DD
= 5 V
5. Current consumption at serial bus activ e (IDD2) ⎯ Clock frequency
1 10 100
20
0
40
60
80
1000
100
I
DD2
[μA]
f
SCL
[kHz]
Ta = 125
°C
Ta = 25
°C
Ta =
−40°C
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
SNT-6A-A-PKG Dimensions
PG006-A-P-SD-2.0
No. PG006-A-P-SD-2.0
0.2±0.05
0.48±0.02
0.08 +0.05
-0.02
0.5
1.57±0.03
123
45
6
Feed direction
4.0±0.1
2.0±0.05
4.0±0.1
ø1.5 +0.1
-0
ø0.5
1.85±0.05 0.65±0.05
0.25±0.05
5°
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
PG006-A-C-SD-1.0
SNT-6A-A-Carrier Tape
No. PG006-A-C-SD-1.0
+0.1
-0
1
2
4
3
56
12.5max.
9.0±0.3
ø13±0.2
(60°) (60°)
QTY.
No. PG006-A-R-SD-1.0
PG006-A-R-SD-1.0
Enlarged drawing in the central part
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
SNT-6A-A-Reel
5,000
No.
TITLE
SCALE
UNIT mm
SNT-6A-A-Land Recommendation
Seiko Instruments Inc.
PG006-A-L-SD-4.0
No. PG006-A-L-SD-4.0
0.3
0.2
0.52
1.36
0.52
1
2
Caution 1. Do not do silkscreen printing and solder printing under the mold resin of the package.
2. The thickness of the solder resist on the wire pattern under the package should be 0.03 mm
or less from the land pattern surface.
3. Match the mask aperture size and aperture position with the land pattern.
4. Refer to "SNT Package User's Guide" for details.
1. (0.25 mm min. / 0.30 mm typ.)
2. (1.30 mm ~ 1.40 mm)
0.03 mm
SNT
1. Pay attention to the land pattern width (0.25 mm min. / 0.30 mm typ.).
2. Do not widen the land pattern to the center of the package ( 1.30 mm ~ 1.40 mm ).
1.
2.
※1. 䇋⊼ᛣ⛞Ⲭᓣⱘᆑᑺ(0.25 mm min. / 0.30 mm typ.)DŽ
※2. 䇋࣓ᇕ㺙Ё䯈ᠽሩ⛞Ⲭᓣ (1.30 mm ~ 1.40 mm)DŽ
⊼ᛣ1. 䇋࣓㛖ൟᇕ㺙ⱘϟ䴶ࠋϱ㔥ǃ⛞䫵DŽ
2. ᇕ㺙ϟǃᏗ㒓Ϟⱘ䰏⛞㝰ᑺ (Ң⛞Ⲭᓣ㸼䴶䍋) 䇋ࠊ0.03 mmҹϟDŽ
3. 㝰ⱘᓔষሎᇌᓔষԡ㕂䇋Ϣ⛞Ⲭᓣᇍ唤DŽ
4. 䆺㒚ݙᆍ䇋খ䯙 "SNTᇕ㺙ⱘᑨ⫼ᣛ"DŽ
2.9±0.2
0.15
1.9±0.2
123
4
65
0.35±0.15
0.95
+0.1
-0.05
0.95
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
No. MP006-A-P-SD-2.0
MP006-A-P-SD-2.0
SOT236-A-PKG Dimensions
No.
TITLE
SCALE
UNIT mm
123
45
6
ø1.5 +0.1
-0 2.0±0.05
ø1.0 +0.2
-0 4.0±0.1
1.4±0.2
0.25±0.1
3.2±0.2
Seiko Instruments Inc.
No. MP006-A-C-SD-3.1
MP006-A-C-SD-3.1
SOT236-A-Carrier Tape
Feed direction
4.0±0.1(10 pitches:40.0±0.2)
No.
TITLE
SCALE
UNIT mm
12.5max.
9.0±0.3
ø13±0.2
(60°) (60°)
QTY 3,000
Seiko Instruments Inc.
Enlarged drawing in the central part
No. MP006-A-R-SD-2.1
MP006-A-R-SD-2.1
SOT236-A-Reel
www.sii-ic.com
• The information described herein is subject to change without notice.
• Seiko Instruments Inc. is not responsible for any problems caused by circuits or diagrams described herein
whose related industrial properties, patents, or other rights belong to third parties. The application circuit
examples explain typical applications of the products, and do not guarantee the success of any specific
mass-production design.
• When the products described herein are regulated products subject to the Wassenaar Arrangement or other
agreements, they may not be exported without authorization from the appropriate governmental authority.
• Use of the information described herein for other purposes and/or reproduction or copying without the
express permission of Seiko Instruments Inc. is strictly prohibited.
• The products described herein cannot be used as part of any device or equipment affecting the human
body, such as exercise equipment, medical equipment, security systems, gas equipment, vehicle equipment,
in-vehicle equipment, aviation equipment, aerospace equipment, and nuclear-related equipment, without prior
written permission of Seiko Instruments Inc.
• The products described herein are not designed to be radiation-proof.
• Although Seiko Instruments Inc. exerts the greatest possible effort to ensure high quality and reliability, the
failure or malfunction of semiconductor products may occur. The user of these products should therefore
give thorough consideration to safety design, including redundancy, fire-prevention measures, and
malfunction prevention, to prevent any accidents, fires, or community damage that may ensue.
