HTU21D 데이터 시트보기 (PDF) - Unspecified
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HTU21D Datasheet PDF : 21 Pages
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HTU21D(F) Sensor
Digital Relative Humidity sensor with Temperature output
Serial clock input (SCK)
SCK is used to synchronize the communication between microcontroller and HTU21D(F) sensor. Since the
interface consists of fully static logic there is no minimum SCK frequency.
Serial data (DATA)
The DATA pin is used to transfer data in and out of the device. For sending a command to the HTU21D(F)
sensor, DATA is valid on the rising edge of 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 shall be valid tSU and tHD before
the rising and after the falling edge of SCK, respectively. For reading data from the HTU21D(F) sensor, DATA is
valid tVD after SCK has gone low and remains valid until the next falling edge of SCK.
An external pull-up resistor (e.g. 10kΩ) on SCK is required to pull the signal high only for open collector or open
drain technology microcontrollers. In most of the cases, pull-up resistors are internally included in I/O circuits of
microcontrollers.
ELECTRICAL CHARACTERISTICS
Input/output DC characteristics
(VDD=3V, Temperature=25°C unless otherwise noted)
Characteristics
Low level output
voltage
VDD=3V
-4mA<IOL<0mA
High level output voltage
Low level input voltage
High level input voltage
Symbol
Min
Typ
VOL
0
-
VOH
70%VDD
-
VIL
0
-
VIH
70%VDD
-
Timing specifications of digital input/output pads for I²C fast mode
Characteristics
SCK frequency
SCK high time
SCK low time
DATA set-up time
DATA hold-time
DATA valid-tile
SCK/DATA fall time
SCK/DATA rise time
Capacitive load on bus line
Symbol
Min
Typ
fSCK
0
-
tSCKLH
0.6
-
tSCLL
1.3
-
tSU
100
-
tHD
0
-
tVD
0
-
tF
0
-
tR
0
-
CB
0
-
Max
0.4
VDD
30%VDD
VDD
Max
0.4
-
-
-
900
400
100
300
500
Unit
V
V
V
V
Unit
MHz
µs
µs
ns
ns
ns
ns
ns
pF
HPC199_3 HTU21D(F) Sensor Datasheet
www.meas-spec.com
9/21
October 2013
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