IQS620 Datasheet, PDF (20/63 Pages) List of Unclassifed Manufacturers – Unique combination of sensing:Capacitive sensing

IQ Switch^
ProxFusion^ Series
6 Device clock, power management and mode operation
6.1 Device main oscillator
The IQS620 has a 16MHz main oscillator (default enabled) to clock all system functionality.
An option exists to reduce the main oscillator to 4MHz. This will result in all system timings, charge
transfers and sample rates to be slower by half of the default implementations.
To set this option this:
o As a software setting – Set the System_Settings: bit4 = 1, via an I²C command.
o As a permanent setting – Set the OTP option in FG Bank 0: bit2 = 1, using Azoteq USBProg
program.
6.2 Device modes
The IQS620 supports the following modes of operation;
 Normal mode (Fixed report rate)
 Low power mode (Reduced report rate)
 Ultra-low power mode (Only channel 0 is sensed for a prox)
 Halt mode (Suspended/disabled)
Note: Auto modes must be disabled to enter or exit halt mode.
The device will automatically switch between the different operating modes by default. However this
Auto mode feature may be disabled by setting the DSBL_AUTO_MODE bit (Power_mode_settings
0xD2: bit5) to confine device operation to a specific power mode. The POWER_MODE bits
(Power_mode_settings 0xD2: bit4-3) can then be used to specify the desired mode of operation.
6.2.1 Normal mode
Normal mode is the fully active sensing mode to function at a fixed report rate specified in the Normal
Mode report Rate (0xD3) register. This 8-bit value is adjustable from 0ms – 255ms in intervals of
1ms.
Note: The device’s low power oscillator have an accuracy as specified in section 9.
6.2.2 Low power mode
Low power mode is a reduced sensing mode where all channels are sensed but at a reduced sample
rate. The sample rate can be specified in the Low Power Mode report Rate (0xD4) register. The 8-
bit value is adjustable from 0ms – 255ms in intervals of 1ms. Reduced report rates also reduce the
current consumed by the sensor.
Note: The device’s low power oscillator have an accuracy as specified in section 9.
6.2.3 Ultra-low power mode
Ultra-low power mode is a reduced sensing mode where only channel 0 is sensed and no other
channels or UI code are executed. Set the EN_ULP_MDE bit (Power_mode_settings: bit6) to enable
use of the ultra-low power mode. The sample rate can be specified in the Low Power Mode report
Rate (0xD5) register. The 8-bit value is adjustable from 0ms – 4sec in intervals of 16ms.
Wake up will occur on prox detection on channel 0.
6.2.4 Halt mode
Halt mode will suspend all sensing and will place the device in a dormant or sleep state. The device
requires an I²C command from a master to explicitly change the power mode out of the halt state
before any sensor functionality can continue.
Copyright © Azoteq 2016
All Rights Reserved
IQS620 Preliminary pre-production datasheet revision 0.91
Information in this datasheet is based on products in the design, validation or qualification phase
of development. The performance and parameters shown in this document are preliminary
without any warranty and are subject to change without notice.
Page 20 of 63
November 2016