SI7013 Datasheet, PDF (24/43 Pages) Silicon Laboratories – I2C HUMIDITY AND TWO-ZONE TEMPERATURE SENSOR

Si7013
5.2. Reading and Writing User Registers
There are three user registers on the Si7013 that allow the user to set the configuration of the Si7013, the
procedure for accessing these registers is set out below.
Sequence to read a register
Slave
Slave
Read Reg
Read
S
W
A
A
Sr Addres R
A
NA
P
Address
Cmd
Data
s
Sequence to write a register
Slave
Write Reg
S
W
A
A
Write Data
A
P
Address
Cmd
5.3. Measuring Analog Voltage
The analog voltage input pins can accept voltage inputs within the ranges shown in Table 15. V_REFP is internally
connected to V_DDA or to an internal 1.25 V reference voltage.
Table 15. Analog Input Ranges
Buffered Input
Unbuffered Input
V_INP Input Range
Min
Max
0.5 V
VDD
0V
VDD
VINN Input Range
Min
0.5 V
0V
Max
VDD
VDD
The voltage conversion output is a signed 16-bit integer that will vary from –32768 to 32767 as the input (V_INP–
V_INN) goes from –V to +V. For best performance, it is recommended that |V_INP–V_INN| be limited to V_ref/2. With
minor degradation in performance, this can be extended to 0.8*Vref. The checksum option for voltage mode
conversions is not supported.
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Rev. 0.95