SHT15 SENSIRION, SHT15 Datasheet - Page 5

• Manufacturer Part Number: SHT15
• Description: Humidity Sensor
• Manufacturer: SENSIRION

Specifications of SHT15

• Sensing Accuracy: 2%
• Sensor Output: Digital
• Sensor Terminals: SMD
• Humidity Accuracy ±: 2%
• Peak Reflow Compatible (260 C): Yes
• Terminal Type: PCB Surface Mount
• Humidity Range: 0 To 100% RH
• Response Time: 8s
• Leaded Process Compatible: Yes
• Package / Case: 4-LCC SMD
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Datasheet SHT1x
resolved by routing VDD and/or GND between the two
data signals and/or using shielded cables. Furthermore,
slowing down SCK frequency will possibly improve signal
integrity. Power supply pins (VDD, GND) must be
decoupled with a 100nF capacitor if wires are used.
Capacitor should be placed as close to the sensor as
possible. Please see the Application Note “ESD, Latch-up
and EMC” for more information.
1.10 ESD (Electrostatic Discharge)
ESD immunity is qualified according to MIL STD 883E,
method 3015 (Human Body Model at 2 kV).
Latch-up immunity is provided at a force current of
100mA with T
Application Note “ESD, Latch-up and EMC” for more
information.
2 Interface Specifications
Table 1: SHT1x pin assignment, NC remain floating.
2.1
The supply voltage of SHT1x must be in the range of 2.4 –
5.5V, recommended supply voltage is 3.3V. Power supply
pins Supply Voltage (VDD) and Ground (GND) must be
decoupled with a 100 nF capacitor – see Figure 10.
The serial interface of the SHT1x is optimized for sensor
readout and effective power consumption. The sensor
cannot be addressed by I
can be connected to an I
other devices connected to the bus. The controller must
switch between the protocols.
Figure 10: Typical application circuit, including pull up resistor
R
www.sensirion.com
Pin Name
NC
1
2
3
4
P
and decoupling of VDD and GND by a capacitor.
DATA Serial Data, bidirectional
GND Ground
Controller
SCK Serial Clock, input only
VDD Source Voltage
Power Pins (VDD, GND)
(Master)
NC
Micro-
Must be left unconnected
amb
= 80°C according to JEDEC78A. See
Comment
2.4 – 5.5V
VDD
2
2
C protocol; however, the sensor
C bus without interference with
100nF
DATA
GND
SCK
VDD
GND
NC
1
2
3
4
A5Z
11
(Slave)
SHT1x
A5Z
11
Version 4.3 – May 2010
NC
NC
NC
NC
NC
2.2
SCK is used to synchronize the communication between
microcontroller and SHT1x. Since the interface consists of
fully static logic there is no minimum SCK frequency.
2.3
The DATA tri-state pin is used to transfer data in and out
of the sensor. For sending a command to the sensor,
DATA is valid on the rising edge of the serial clock (SCK)
and must remain stable while SCK is high. After the falling
edge of SCK the DATA value may be changed. For safe
communication DATA valid shall be extended T
before the rising and after the falling edge of SCK,
respectively – see Figure 11. For reading data from the
sensor, DATA is valid T
remains valid until the next falling edge of SCK.
To avoid signal contention the microcontroller must only
drive DATA low. An external pull-up resistor (e.g. 10kΩ) is
required to pull the signal high – it should be noted that
pull-up resistors may be included in I/O circuits of
microcontrollers. See Table 2 for detailed I/O characteristic
of the sensor.
2.4
The electrical characteristics such as power consumption,
low and high level input and output voltages depend on
the supply voltage. Table 2 gives electrical characteristics
of SHT1x with the assumption of 5V supply voltage if not
stated otherwise.
Parameter
Power supply DC
Supply current
Low level output
voltage
High level output
voltage
Low level input
voltage
High level input
voltage
Input current
Output current
Table 2: SHT1x DC characteristics. R
resistor, while I
10
11
Recommended voltage supply for highest accuracy is 3.3V, due to sensor
calibration.
Minimum value with one measurement of 8bit resolution without OTP reload
per second. Typical value with one measurement of 12bit resolution per
second.
Serial clock input (SCK)
Serial data (DATA)
Electrical Characteristics
on pads
OL
10
is low level output current.
Conditions
measuring
average
sleep
I
R
Negative going 0%
Positive going 80%
on
Tri-stated (off)
OL
P
< 4 mA
< 25 kΩ
V
11
after SCK has gone low and
90%
min
2.4
2
0
P
stands for pull up
0.55
typ
3.3
0.3
28
10
100% VDD
100% VDD
20% VDD
SU
max Units
250
5.5
1.5
20
1
1
4
and T
mA
mV
mA
µA
µA
µA
µA
5/11
V
HO