ZOPT2201 Datasheet

© 2016 Integrated Device Technology, Inc

22

September 2, 2016

3.8

Interrupt Features

The ZOPT2201 can generate an interrupt signal on a user-selected sensor channel. Interrupts will be triggered if upper or lower threshold

values are crossed or if the output count variation of consecutive conversions has exceeded a defined limit.

An interrupt can be displayed at the INT pin as an active-low signal or via a status register flag. Interrupt conditions are always evaluated after

completion of a new conversion on the selected sensor channel.

The ls_int signal (output of LSIntGen in Figure 3.5) is also stored in the MAIN_STATUS register as the LS interrupt status (see section 3.11.5)

flag. The flag is cleared by reading the MAIN_STATUS register. A cleared LS interrupt status flag will also clear the interrupt signal on the INT

pin.

Figure 3.5 Interrupt Unit

ls_int_sel

IntUnit

ls_int

ls_int_en

LSIntGen

ls_thres_up

ls_thres_low

ls_thres_var

ls_persist

ls_var_mode

LSIntGen

0

1

ls_var_mode

ls_thres_up

ls_thres_low

ls_thres_var

ls_persist

+

-

-

+

+

-

|diff|

decode

ls_int

ls_data

INT pin

ls_data

read status reg

or

ls_init

ls_int_stat

persist

R

S

Reserved

00

01

10

11

Reserved

UVB CHANNEL

ALS CHANNEL

The interrupt is configured by the bits in the INT_CFG register (see section 3.11.10). It can function as either threshold triggered

(LS_VAR_MODE = 0) or variance trigged (LS_VAR_MODE = 1).

The interrupt source generator is configurable to be one of the following input channels: ALS or UVBS. The interrupt source is selected by the

LS_INT_SEL bits in the INT_CFG register (see section 3.11.10).