TSL2520 datasheet(12/69 Pages) OSRAM

12 / 69 page

Datasheet, Public

Page 11

[v3-00] 2022-Dec-20

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TSL2520 − Detailed Description

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

(typically 500μs), 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 a function is enabled

(AEN = 1)the device exits the IDLE state. If all functions are

disabled (AEN = 0), the device returns to the IDLE state.

If sleep after Interrupt is enabled (SAI = 1 in register 0xA1), the

state machine will enter SLEEP when an interrupt occurs.

Entering SLEEP does not automatically change any of the

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 0x9F and the clear status bit is in register 0xB1).

State Machine Diagrams

Figure 15:

Simplified State Diagram

Detailed Description

AEN

IDLE

ALS

SLEEP

PON

TSL2520 Datasheet(PDF) 12 Page - OSRAM GmbH