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AS73211

Functional Description

Datasheet

• PUBLIC

DS000556

• v3-01 • 2018-Feb-07

│ 39

voltage variations. The conversion time measurement can be enabled by setting bit CREG2:EN_TM

bit to ‚1‘ (see Figure 49). At the end of the conversion the result is stored into the output register

OUTCONV (see Figure 53) synchronously with the measurement results (MRES). The stored value

follows the relation:

Equation 5:

CLK

CONV

OUTCONV





The bit STATUS:OUTCONVOF of the status register (see Figure 54) shows an overflow of the

conversion time counter OUTCONV. In case it happens and the conversion is still in process, the

counter OUTCONV starts again at 0. For the calculation of the full scale range (FSR) see formula 1, 2

and 3 in chapter “Transfer function.

7.16

Temperature Measurement

Additional to the three optical channels a temperature measurement is done in parallel. The

measurement result is available as TEMP of the output result registers. The resolution of the

temperature measurement is 12 bits by a step size of 0.05

K per bit, which means 20 counts per Kelvin. The value of the chip temperature (silicon

– measured in

°C) is equal to:

Equation 6:

TEMP

CHIP











With other words TEMP = 922h (2338dec) corresponds to 50°C as a reference point to start

calculations.

The temperature measurement is available in the measurement modes CONT, CMD and SYNS. By

values of CREG1:TIME < 2dec the resolution of the temperature measurement is reduced, but in this

case the output value of TEMP is internally corrected.

In the SYND measurement mode it is important to enable the conversion time measurement

(CREG2:EN_TM = ‚1‘) to get any result of the temperature measurement. In addition, the value of

output register OUTCONV has to be more than 212 given by the external conversion time at pin SYN!

7.17

I²C Communication

The two wire serial interface is compatible to the fast mode I²C protocol with a bit rate up to 400kbit/s.

The AS73211 exclusively operates as slave with its slave address [6:0] = (1, 1, 1, 0, 1, A1, A0). The

two lowest-order bits are defined by the input pins A1 and A0, which allows to run four AS73211 on

the same I²C bus at the same time. Within the AS73211 the pin SCL of the I²C interface is realized as

input pin, wherefore in single master applications the I²C master could drive the SCL line with a push-

pull stage. In all other cases the requirements for bus termination using standard pull-up according to

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