AS1163 datasheet(23/91 Pages) AMSOSRAM

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AS1163

Functional description

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6.3.2

ADDRESSED state

With a correct INITBIDIR / INITLOOP telegram the SAID IC reaches the INITIALIZED state. A

SAID, receiving the address, latches the received address, changes the address field to the

next possible value and sends it via output SIO port. After this operation, it waits for a new

telegram. Any further INITBIDIR / INITLOOP telegrams will not change the state of the device.

In this way the received address is incremented by +1 and sent to next device in the chain. If

the IC has detected it is the last node in a chain, it sends a response telegram back to the

MCU.

6.3.3

ACTIVE state

The transition to this state is via GOACTIVE command only. LED drivers are activated if the

PWM parameter is greater than 0 and no diagnosis flag bit occurred, according to the wanted

error trapping behavior specified via SETUP register. Received PWM parameters for drivers

are latched till the next SETPWMCHN / SETPWM command is received. Since SAID has the

OV_FLAG set after RESET, it will not switch to ACTIVE state unless the error trapping

behavior is changed beforehand in the SETUP register. It is recommended to send a

READSTATUS or READTEMPSTAT / CLEAREVENT before GOACTIVE is transmitted.

6.3.4

SLEEP state

The device enters SLEEP mode after following conditions:

•

After initial INITBIDIR / INITLOOP(default state)

•

An error bit gets flagged whose trapping is enabled in the SETUP register (if previous state

is the active state)

•

Receiving a GOSLEEP telegram.

The LED drivers are disabled. The last PWM parameters remains latched. A PWM parameter

update is possible SETPWMCHN telegram.

The faults/diagnostic flags that lead to SLEEP mode are specified in the SETUP register.

During SLEEP mode reading diagnostic flags and temperature is possible.

AS1163 Datasheet(PDF) 23 Page - ams-OSRAM AG