AS89010 datasheet(20/43 Pages) AMSOSRAM

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db12348e_V3.11_preliminary_2017-07-06

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AS89010

V3.11

5.6.3 I²C Addressable Register Space

Table 6 shows the overview of the internal register which can be accessed via I²C interface. The control

The output registers can only be accessed for read in the measurement state. They are 16 bit long, except

OUTINT which is 24 bit long. The device transfers the output data registers with the lowest byte first. The

output registers data transfer can start at any address. If the transfer starts not at address (hex) 00h and

during the sequential data read the highest possible address is arrived (ENTM=1: Address 04 with 3 byte;

ENTM=0: Address 03 with 2 byte), the internal pointer resets back to the address 00h so that next data

byte transferred corresponds to the low byte of OUT0. In this manner transfer continues with the first

number of bytes accessible at all (8 bytes if integration time measurement is not activated otherwise

11 bytes). The OUTINT is only valid if CREGH:ENTM bit has been set.

Table 6: Register access overview

ADDRESS

[hex]

ACCESS IN CONFIGURATION STATE

ACCESS IN MEASUREMENT STATE

Write

Read

Write

Read

OSR

–

OSR

OUT0

–

OUT1

–

AGEN

–

OUT2

–

OUT3

–

OUTINT

–

CREGL

–

CREGH

–

OPTREG

–

BREAK

–

EDGES

–

5.6.4 Examples of using I²C-interface

An example of usual I²C communication set of sequences is shown in Figure 13. After a Power-up, the

device is in a default configuration state. User can now set up the device for the application by writing

control register. Success of the configuration can be proven by reading the control register.

Before a measurement can be started, the device must change its state into the measurement mode. In

the last three bits of OSR ‘011b’ should be loaded. Now a conversion can be started, it will start accordingly

to the measurement mode selected by CREGH:MODE. When a conversion ends, rising edge of READY

signalizes this (not in SYND Mode), the conversion data can be read.

If a new configuration should be implemented, the device has to change its state back to configuration

mode, by loading ‘010b’ into the last three bits of OSR. At this action all control registers will reset to their

default values. New configuration can be made now.

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