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AS7341L

Datasheet

• PUBLIC

DS000718

• v1-00 • 2020-May-25

│ 53

10.2.9

FIFO Buffer Data and Status

The FIFO buffer is used to poll spectral data with fewer I²C read and write transactions. The FIFO

buffer is 256 bytes of RAM containing 128 two-byte datasets. If the FIFO overflows (i.e. 129 datasets

before host reads data from the FIFO buffer), an overflow flag will be set and new data will be lost.

The Host acquires data by reading addresses: 0xFE

– 0xFF. The register address pointer

automatically wraps from 0xFF to 0xFE as data are read. Data can be read one byte at a time or in

blocks, (there is no block-read length limit). When reading single bytes, the internal FIFO read pointer

and the FIFO Buffer Level, FIFO_LVL, are updated each time register 0xFF is read. For block-reads,

the internal FIFO read pointer and the FIFO Buffer Level, FIFO_LVL update for each two-byte entry. If

the FIFO continues to be accessed after FIFO_LVL = 0, the device will return 0 for all data. The FINT

interrupt indicates when there is valid data in the FIFO buffer. The amount of unread data is indicated

by the FIFO_LVL.

FIFO_MAP Register (Address 0xFC)

Figure 83:

FIFO_MAP Register

Addr: 0xFC

FIFO_MAP

Bit

Bit Name

Default

Access

Bit Description

reserved

FIFO_WRITE_CH5_DATA

FIFO Write CH5 Data.

If set, CH5 data is written to the FIFO Buffer. (two

bytes per sample).

FIFO_WRITE_CH4_DATA

FIFO Write CH4 Data.

If set, CH4 data is written to the FIFO Buffer. (two

bytes per sample)

FIFO_WRITE_CH3_DATA

FIFO Write CH3 Data.

If set, CH3 data is written to the FIFO Buffer. (two

bytes per sample)

FIFO_WRITE_CH2_DATA

FIFO Write CH2 Data.

If set, CH2 data is written to the FIFO Buffer. (two

bytes per sample)

FIFO_WRITE_CH1_DATA

FIFO Write CH1 Data.

If set, CH1 data is written to the FIFO Buffer. (two

bytes per sample)

FIFO_WRITE_CH0_DATA

FIFO Write CH0 Data.

If set, CH0 data is written to the FIFO Buffer. (two

bytes per sample)

FIFO_WRITE_ASTATUS

FIFO Write Status.

If set, ASTATUS (one byte per sample) is written

to the FIFO Buffer.

In case SP_AGC_ENABLE = 1, ASTATUS should

be written to FIFO buffer.

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