STM8T141 datasheet(18/50 Pages) STMICROELECTRONICS

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Device operation

STM8T141

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Doc ID 15699 Rev 7

Device operation

The STM8T141 can be configured through a set of selectable one-time programmable

(OTP) option bytes. These options can be used in their default (unconfigured) state or set for

specific applications. For large orders, preconfigured devices are available (please refer to

Section 11: Ordering information).

The STM8T141 can be configured to act as a touch or proximity detection device. A number

of other options are also user programmable, including:

●

Four output modes

–Active mode

–

Toggle mode

–

3-second Latch mode

–

30-second Latch mode

●

TOUT/POUT output mode selection

●

Four detection thresholds

–

Two for touch detection

–

Two for proximity detection

●

Four power modes

–

Normal power mode

–

Three low power modes

●

Reference freeze timeout

7.1

Option byte description

A set of tools is supplied by STMicroelectronics to program the user OTP options for

prototyping purposes. Please refer to Section 12: STM8T141 development tools for more

details.

Note:

Devices that are not yet programmed (“blank” devices) are delivered cleared (at value ‘0’) for

all bits.

The user options allow the STM8T141 to be customized for each specific application.

Default values for the oscillator, conversion rate (tSAMPLING), filter freeze and device reset

settings should be used initially for first designs.

Table 5.

Option bytes

Option

byte

no.

Option bits

Factory

default

setting

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

OPT1

Reserved

Sampling

period

Charge

transfer

frequency

Reserved

0xX0

OPT0

Power mode

Detection threshold

Reference freeze

timeout

TOUT/POUT

output mode

0x00

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