SI7013-A20 Datasheet, PDF (25/45 Pages) Silicon Laboratories – IC HUMIDITY AND TWO-ZONE TEMPERATURE SENSOR

Si7013-A20
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. The checksum byte is not supported after reading a user
register.
Slave
S
W
Address
Sequence to read a register
Read Reg
A
A
Cmd
Slave
Sr Addres R
s
Read
A
NA
P
Data
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 16. V_REFP is internally
connected to V_DDA or to an internal 1.25 V reference voltage.
Table 16. Analog Input Ranges
Buffered Input
Unbuffered Input
V_INP Input Range
Min
Max
0.35 V
0V
V_DD–0.35 V
V_DD
VINN Input Range
Min
0.35 V
0V
Max
V_DD–0.35 V
V_DD
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.
Rev. 1.1
25