LDS6200 datasheet(21/36 Pages) RENESAS

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LDS6200 Family

Doc. No. 6200 FamilyDS, Rev. 0.5

Characteristics subject to change without notice

OPERATING MODES

The LDS6200 Family may be programmed to operate

in three different modes.

full

power

mode,

touch

detection

occurs

continuously,

without

delays

between

detection

cycles. This mode is utilized when the touch inputs

need to be fully active and always responsive to

touch inputs. Due to its ultra-low touch sensor power

consumption of <125uW***, the LDS6200 Family may

be operated continuously in full power mode even

when battery life is of premium importance.

The device may also be put into a configurable low

power mode for situations where a small inserted

delay (typically less than 0.3s) between the first touch

and touch reporting is acceptable. This optional low

power mode can cut power by more than half.

Lastly, the device can be put into Shutdown mode,

which disables touch sensing and lowers power

consumption to ~1uW (typical).

Only the serial

interface bus is active during Shutdown mode to

receive any commands (such as exit from Shutdown

mode).

Two methods of device reset are provided. Software

Reset (writing any value to register 0x001) executes

a soft reset of the device by initiating a new

calibration cycle and resetting the state machine,

including the Interrupt Status Register.

Previously

configured

control

registers,

however,

are

not

affected by a Software Reset, so no reconfiguration

or re-initialization need occur.

Hardware Reset (setting RESETB low or writing

any value to register 0x000) resets the state

machine and all previously configured registers,

requiring a re-initialization by the host to set

configuration registers to their proper state.

Both Software and Hardware Reset take ~0.5-1s in

the typical case to return the device to its fully

functioning state. The actual time depends upon the

number of active sensors requiring calibration and

the relative sensor values.

Where start-up time is

especially

important,

fine-tuning

certain

configuration registers is possible to expedite initial

calibration. Please contact your IDT representative if

start-up time optimization is required.

POWER-UP/INITIALIZATION SEQUENCE

The power up and initialization sequence involves the

following flow:

Power-Up → Cold Reset Command → Initialize

Configuration Registers → Software Reset Command

Initialization of the configuration registers is required

to define the functionality of each channel, set touch

sensitivity levels, and generally specify the desired

configuration of the highly flexible LDS6200 Family

touch controller. The Cold Reset and Software Reset

Commands are required to ensure consistency of

operation before and after the initialization process

occurs.

AUTOMATIC CALIBRATION MODE

The LDS6200 Family integrates on-chip sensor

calibration

compensate

for

uncontrollable

environmental

factors

such

moisture

and

temperature changes. Without such compensation,

the baseline “no-touch” value may drift over time,

affecting the ability of the device to measure valid

touch events. The calibration algorithm is executed

after every conversion cycle, ensuring that even

rapidly

changing

ambient

conditions

are

well

compensated.

*** 1.8V, excluding VDDIO current, which varies with VDDIO

voltage, I/F type, and communication frequency

LDS6200 Datasheet(PDF) 21 Page - Renesas Technology Corp

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