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TMF8801

Datasheet

• PUBLIC

DS000648

• v10-00 • 2022-Dec-20

│ 29

cmd_data5 = Bits for GPIO control

Bits

Definition

3:0

GPIO0 settings

– Input

1 - Input: active low disables collection, immediately abandoning

current measurement. Returning to high restarts new

measurement

2 - Input: active high disables collection, immediately

abandoning current measurement. Returning to low restarts new

measurement

3 - Output: VCSEL pulse output

– see cmd_data4

4 - Output low (default after startup)

5 - Output high

6:15

– Reserved, do not use

7:4

GPIO1 settings

0 - Input

1 - Input: active low disables collection, immediately abandoning

current measurement. Returning to high restarts new

measurement

2 - Input: active high disables collection, immediately

abandoning current measurement. Returning to low restarts new

measurement

3 - Output: VCSEL pulse output

– see cmd_data4

4 - Output low (default after startup)

5 - Output high

6:15

– Reserved, do not use

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 TMF8801 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

TMF8801 Datasheet(PDF) 30 Page - OSRAM GmbH

TMF8801 Datasheet(HTML) 30 Page - OSRAM GmbH

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