ZOPT2202 Datasheet

© 2016 Integrated Device Technology, Inc

19

September 21, 2016

3.7

Interrupt Features

The ZOPT2202 can generate an interrupt signal on a user selectable sensor channel. Interrupts will be triggered if upper or lower threshold

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

An interrupt can be indicated 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 3.4) is also stored in the MAIN_STATUS register as the LS interrupt status (see section 3.10.5)

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 3.4 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

UVB2

00

01

10

11

UV_COMP

UVB CHANNEL

UVA CHANNEL

The interrupt is configured by the bits in the INT_CFG register (see section 3.10.11). The interrupt is enabled by setting the bit

LS_INT_EN = 1. 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: UVA, UVB, UVB2, or UV_COMP. The interrupt

source is selected by the LS_INT_SEL bits.