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AS6221

Register Description

Datasheet

• PUBLIC

DS000751

• v3-00 • 2022-Feb-28

38

│ 23

Example 75°C:

75°������/0.0078125°������ = 9600 = ������������������������������������ 0010 0101 1000 0000 = ������������������ 2580

Example -40°C:

|−40°������|/0.0078125 °������ + 1 = 5120 + 1 = ������������������������������������ 0001 0100 0000 0000 + 1 = 1110 1100 0000 0000 =

������������������ EC00

Figure 27:

Temperature Conversion Examples

Temperature (°C)

Digital Output (Binary)

Digital Output (Hex)

100.0

0011 0010 0000 0000

3200

75.0

0010 0101 1000 0000

2580

50.0

0001 1001 0000 0000

1900

25.0

0000 1100 1000 0000

0C80

0.125

0000 0000 0001 0000

0010

0.0078125

0000 0000 0000 0001

0001

0.0

0000 0000 0000 0000

0000

-0.0078125

1111 1111 1111 1111

FFFF

-0.125

1111 1111 1111 0000

FFF0

-25.0

1111 0011 1000 0000

F380

-40.0

1110 1100 0000 0000

EC00

6.3

Serial Interface

The device employs a standard I²C-serial bus.

6.3.1

Bus Description

A data transfer must be invoked by a master device (e.g. microcontroller) which defines the access to

the slave device. The master device defines and generates the serial clock (SCL) and the start/stop

conditions.

In order to address a specific device, a START condition has to be generated by the master device by

pulling the data line (SDA) from a logic high level to a logic low level while the serial clock signal (SCL)

is kept at high level.

After the start condition, the slave address byte is transmitted which is completed with a ninth bit which

indicates a read (bit=’1’) or a write operation (bit=’0’) respectively. All slaves read the data on the rising