TMF8805 datasheet(30/74 Pages) OSRAM

30 / 74 page

TMF8805

Datasheet

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DS000692

• v7-00 • 2023-Dec-01

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Addr: 0x10

COMMAND

Field

Name

Rst

Type

Description

cmd_data4 = If cmd_data5 enables VCSEL pulse output for

GPIO0 and/or GPIO1, cmd_data4 sets its timings as follows:

Value

Meaning

No signal

GPIOx, rises 0 µs time before VCSEL pulse starts

GPIOx rises 100 µs before VCSEL pulse

GPIOx rises 200 µs before VCSEL pulse and so on

The falling edge of GPIOx happens at the same time the VCSEL

stops emitting light.

cmd_data3 = Object detection threshold and spread spectrum

mode

Bits

Definition

5:0

Object detection threshold

– use 0 as default value

spread_spectrum_mode: If set, avoids aliasing of

objects into measurement range. Use together with

VCSEL_clk_div2=1 otherwise maximum distance is

reduced and false objects at far distance can occur.

Set to ‘0’

cmd_data2 = repetition_period in mSec, use 0 for single

measurement; if the repetition period is set lower than the

ranging time for this mode, the TMF8805 runs at it maximum

possible speed (best effort approach).

cmd_data1 = Number of iterations, low byte; 1 LSB=1 k

cmd_data0 = Number of iterations, high byte; 1 LSB=1 k*256

Once a measurement is finished, the interrupt is asserted if it is

enabled by int1_enab. Additionally, the transaction ID tid is

updated

0x08

Write additional configuration for application

– only available for

firmware version 3.0.22 or higher

cmd_data4 = persistence 8-bit value for interrupt suppression

Value

Defnition

Any result (detect and no-detect) will trigger an interrupt

1-255

An interrupt will only be triggered if the detected

distance is >= low_threshold and

distance <= high_threshold and

the detection happened at least <persistence>

consecutive times

cmd_data3 = low_threshold 8-bit LSB value

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