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AS7341

Functional Description

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

│ 17

Functional Description

Upon power-up (POR), the device initializes. During initialization

(typically 200μs), the device will

deterministically send NAK on I²C and cannot accept I²C transactions. All communication with the

device must be delayed and all outputs from the device must be ignored including interrupts. After

initialization, the device enters the SLEEP state. In this operational state, the internal oscillator and

other circuitry are not active, resulting in ultra-low power consumption. If an I²C transaction occurs

during this state, the I²C core wakes up temporarily to service the communication. Once the Power ON

bit,

“PON”, is enabled, the device enters the IDLE state in which the internal oscillator and attendant

circuitry are active, but power consumption remains low. Whenever the spectral measurement is

enabled (SP_EN

= “1”) the device enters the ACTIVE state. If the spectral measurement is disabled

(SP_EN

= “0”) the device returns to the IDLE state. The figure below describes a simplified state

diagram and the typical supply currents in each state.

If Sleep after Interrupt is enabled

(SAI = “1” in register 0xAC), the state machine will enter SLEEP

when an interrupt occurs. Entering SLEEP does not automatically change any of the register settings

(e.g. PON bit is still high, but the normal operational state is over-ridden by SLEEP state). SLEEP

state is terminated when the SAI_ACTIVE bit is cleared (the status bit is in register 0xA7 and the clear

status bit is in register 0xFA).

Figure 20: Simplified State Diagram

Power On

VDD > VDD_POR

PON = „1"

SPM = „1"

SLEEP

IDD = 0.7µA (typ)

IDLE

IDD = 35µA (typ)

ACTIVE

Spectral/Flicker

IDD = 115µA (typ)

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