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TMF8801

Functional Description

Datasheet

• PUBLIC

DS000648

• v10-00 • 2022-Dec-20

│ 17

7.5.2

Reset Pin and Power-Up Timing

Figure 17:

Reset Pin and Power-Up Timing

Parameter

Min

Nom

Max

Units

Comment

Power On (Boot Time)

Does not include RAM

download time

Enable high to ready for

measurement

Standby to Active Time

<<1

Active to Standby Time

<<1

Enable Low to Power Down

Time

<<1

7.6

Algorithm Performance

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

for devices with order code TMF8801-1B (and TMF8801-1BM), 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 TMF8801 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 TMF8801 optical design guide (external document).

7.6.1

Calibration

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

performed (command = 0x0A). The TMF8801 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 TMF8801.

The TMF8801 generates a calibration data set which is permanently stored on the host.

On each power-up of the TMF8801 the calibration data set is sent by I²C to the TMF8801 prior to

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

TMF8801 Datasheet(PDF) 18 Page - OSRAM GmbH

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