TMF8805 datasheet(18/74 Pages) OSRAM

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TMF8805

Functional description

Datasheet

• PUBLIC • Document Feedback

DS000692

• v7-00 • 2023-Dec-01

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5.6

Algorithm performance

As the performance of the algorithm is dependent on the ROM version, following section only

applies for devices with order code TMF8805-1B (and TMF8805-1BM), calibrated and in-

application oscillator calibration using the reference driver code and patched with the latest

software patch from ams OSRAM

– contact ams OSRAM to identify latest patch version.

To achieve the full distance of 250 cm, the on chip oscillator needs to be tuned to 4.7 MHz.

The TMF8805 is embedded in the application using a 0.38 mm airgap and a glass with an IR

ink with >90 % transmissivity. The glass thickness is 0.5 mm. An additional mask on the

opaque ink is implemented according to TMF8805 optical design guide (external document).

5.6.1

Calibration

To achieve the performance described in the next sections, a calibration of the algorithm

needs to be performed (command = 0x0A). The TMF8805 shall be embedded in the final

application and the cover glass including the IR ink needs to be assembled. The calibration

test shall be done in a housing with minimal ambient light and no target within 40 cm in field of

view of the TMF8805.

The TMF8805 generates a calibration data set which is permanently stored on the host.

On each power-up of the TMF8805 the calibration data set is sent by I²C to the TMF8805 prior

to execution of any algorithms (commands=0x02 or 0x0B).

5.6.2

Algorithm timings

The TMF8805 can adjust the number of iterations and detection threshold using registers. A

default mode is defined having 900 k iterations and threshold=0.

Table 10: Algorithm timings

Parameter

Condition

Min

Nom

Max

Units

Default Mode

command=0x02 or 0x03

cmd_data6=0xA3,

cmd_data3=0x00,

cmd_data1=0x84,

cmd_data0=0x03 (900 k iterations)

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