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SI7013-A10-IM

I2C HUMIDITY AND TWO-ZONE TEMPERATURE SENSOR

Silicon Laboratories 

Si7013-A10

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.

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. VREFP is internally

connected to VDDA or to an internal 1.25 V reference voltage.

Table 15. Analog Input Ranges

Buffered Input

Unbuffered Input

VINP Input Range

Min

Max

0.35 V

0V

VDD–0.35 V

VDD

VINN Input Range

Min

0.35 V

0V

Max

VDD–0.35 V

VDD

The voltage conversion output is a signed 16-bit integer that will vary from –32768 to 32767 as the input (VINP–

VINN) goes from –V to +V. For best performance, it is recommended that |VINP–VINN| be limited to Vref/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. 1.0

25

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