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參數(shù)資料
| 型號(hào)： | DS18S20Z/T&R |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | Switch/Digital Output Temperature Sensor |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), 0.50Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | SOP-8 |
| 文件頁數(shù)： | 12/23頁 |
| 文件大?。?/td> | 252K |
| 代理商： | DS18S20Z/T&R |
DS18S20
2 of 23
ORDERING INFORMATION
PART
TEMP RANGE
PIN-PACKAGE
DS18S20
–55°C to +125°C
3 TO-92
DS18S20+
–55°C to +125°C
3 TO-92
DS18S20/T&R
–55°C to +125°C
3 TO-92 (2000 Piece)
DS18S20+T&R
–55°C to +125°C
3 TO-92 (2000 Piece)
DS18S20-SL/T&R
–55°C to +125°C
3 TO-92 (2000 Piece)*
DS18S20-SL+T&R
–55°C to +125°C
3 TO-92 (2000 Piece)*
DS18S20Z
–55°C to +125°C
8 SO
DS18S20Z+
–55°C to +125°C
8 SO
DS18S20Z/T&R
–55°C to +125°C
8 SO (2500 Piece)
DS18S20Z+T&R
–55°C to +125°C
8 SO (2500 Piece)
+Denotes a lead(Pb)-free/RoHS-compliant package. A “+” appears on the top mark of lead(Pb)-free packages.
T&R = Tape and reel.
*TO-92 packages in tape and reel can be ordered with straight or formed leads. Choose “SL” for straight leads. Bulk TO-92 orders are straight
leads only.
PIN DESCRIPTION
PIN
NAME
FUNCTION
TO-92
SO
1
5
GND
Ground
2
4
DQ
Data Input/Output. Open-drain 1-Wire interface pin. Also provides
power to the device when used in parasite power mode (see the
Powering the DS18S20 section.)
3
VDD
Optional VDD. VDD must be grounded for operation in parasite
power mode.
—
1, 2, 6, 7,
8
N.C.
No Connection
OVERVIEW
Figure 1 shows a block diagram of the DS18S20, and pin descriptions are given in the Pin Description
table. The 64-bit ROM stores the device’s unique serial code. The scratchpad memory contains the 2-byte
temperature register that stores the digital output from the temperature sensor. In addition, the scratchpad
provides access to the 1-byte upper and lower alarm trigger registers (TH and TL). The TH and TL registers
are nonvolatile (EEPROM), so they will retain data when the device is powered down.
The DS18S20 uses Maxim’s exclusive 1-Wire bus protocol that implements bus communication using
one control signal. The control line requires a weak pullup resistor since all devices are linked to the bus
via a 3-state or open-drain port (the DQ pin in the case of the DS18S20). In this bus system, the
microprocessor (the master device) identifies and addresses devices on the bus using each device’s unique
64-bit code. Because each device has a unique code, the number of devices that can be addressed on one
bus is virtually unlimited. The 1-Wire bus protocol, including detailed explanations of the commands and
“time slots,” is covered in the 1-Wire Bus System section.
Another feature of the DS18S20 is the ability to operate without an external power supply. Power is
instead supplied through the 1-Wire pullup resistor via the DQ pin when the bus is high. The high bus
signal also charges an internal capacitor (CPP), which then supplies power to the device when the bus is
low. This method of deriving power from the 1-Wire bus is referred to as “parasite power.” As an
alternative, the DS18S20 may also be powered by an external supply on VDD.
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